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Introduction

The subject of this review is the Crystal Acoustics TX-SUB12 . The TX-SUB12 is a bass reflex subwoofer with a 12" front-firing driver and dual rear ports. The review unit measured 18.5"x13.75"x18.5" (HxWxD, not including grill) and weighed 64 pounds, essentially identical to what Crystal Acoustics publishes on their website. The amp is rated at 200 watts RMS, 400 watts peak. The quoted frequency response is 20Hz-200Hz anechoic, and 15Hz-350Hz in room. The warranty is 2 years. For passive speakers -- like centers, towers, etc. -- the warranty is an almost unheard of 10 years. The TX-SUB12 retails for $750.


Crystal Acoustics started in Greece 14 years ago (1998). They've been selling speakers in the US since 2006.


Ordering

Crystal Acoustics is an Internet Direct (ID) company. For the US and Europe all sales are done exclusively through their website, but for the rest of the world they utilize dealers and distributors. The review unit was supplied to me by the manufacturer, so I didn't go through the normal ordering procedure.


They offer a very generous 60 day in home trial for their US and European customers, which is double what most similar companies provide. Shipping to the customer is free.


Unboxing

For those who have read some of my other reviews you'll know that I consider how a company packages their products to be of vital importance. After all, if they don't care how (if?) your product arrives why would they care about how it was designed or engineered? Crystal Acoustics did something no other manufacturer has ever done with a review unit; made me sweat just to unpack it. Grab some of your favorite beverage and have a seat, because this is going to take a while to fully explain.


The shipping box was cover in shrink wrap and had "fragile" stickers -- some rather large -- plastered all over it. Once the plastic was cut away I found a surprise; the entire box was covered in bubble wrap. That's right, I had to cut off two layers just to get at the shipping box! Take a sip of your drink now, because we're just getting warmed up...


I open the shipping box and I find another box inside. Nothing surprising there, at least for a good quality subwoofer. So I slide the inner box out and cut that open, turn it upside down and pull it off to reveal the sub. Well, sort of; it's encased in a plastic bag, which isn't atypical either. So I remove the plastic bag, only to be confronted by a cloth sheet that completely covers the sub. I peel off the cloth sheet to find there are now foam sheets under the cloth. By this point I'm beginning to wonder if I'll ever get to the actual subwoofer.


After removing the foam sheets I see that the painted surfaces are covers in a thin film of plastic. It's taken me over 10 minutes just to get this far, and I'm still not done! I remove the thin film half expecting to find something else, but mercifully there's nothing. Finally, I reach the TX-SUB12. For those keeping score that's 8 -- yes, 8! -- layers of protect. That doesn't even include the foam blocks used at all corners of the inner box. I find it hard to believe any shipping company could damage this thing even if they tried (which I sometimes wonder if they actually do). I worked up a sweat for sure, but I like Crystal Acoustics already; any company who goes to that extreme to protect their products during shipping is OK in my book.


The owners manual consists of a single booklet that covers several Crystal Acoustics products, and contains a lot of information about speakers in general. It's professional in appearance and layout, but I would have preferred something specific to just the TX-SUB12. The information it contains is pretty good though.


There weren't any accessories or options included except the power cord. There are no carpet spikes, just rubber feet which were already attached. The feet aren't very tall or wide unfortunately, being perhaps 1/4" tall and 1/2" across. For hard surfaces they would keep the sub off the floor, barely, but on carpet they simply disappear into the pile.


Initial Impressions

Let me start out by saying I really like the way this subwoofer looks. It projects a very elegant appearance, almost regal (if that's even possible). If nothing else it's classy. The paint finish was flawless, even under a florescent light (anyone who has professionally detailed cars, like I have, knows first hand that a florescent light will easily uncover even the most insignificant swirls or scratches). The vinyl sides panels contrast the paint beautifully and give it a unique appearance. The grill sits up off the front panel about 1/2", suspended by high-quality stainless steel pins in a brushed silver finish. The overall appearance is very stylish. Evidently design and appearance are very important to these folks.


The grill could be a little more sturdy; it's on a rather thin .5" MDF frame and flexes too easily. I wouldn't call it flimsy, but it could be a bit more rigid. The grill material is very transparent, and was attached to the frame perfectly. If you're not prone to taking the grill on and off frequently this probably won't be a concern for you.


The only other nit to pick with the appearance is there were two small bumps under the finish on the top panel. I had to move back and forth using the florescent light to actually see them, but they were there. Under normal ambient lighting they were almost invisible so I don't consider this an issue, but given the obvious attention to detail everywhere else I found that a bit surprising.


All the screws on the driver and amp were tight, with just a few needing the slightest twist. Essentially nothing was loose. Overall, I would rate the quality of materials and workmanship as excellent. It's apparent Crystal Acoustics wants to project a certain image, and I think they succeed.


The driver utilizes some type of hybrid foam/rubber surround that's larger then average. The cone itself is made of a stiff treated paper, and has an inverted dustcap. The magnet is huge, far more prominent then a lot of other subwoofers in this price range. It's fully encased too. The basket is stamped steel, with large voids to promote cooling. The driver is attached to the cabinet using threaded inserts, which is a good thing because it's rather heavy. The impression is of substance and heft.


The cabinet is cross braced and has damping material everywhere (including up against the back panel, where the amp is). The ubiquitous knuckle rap test returns a very solid and inert sounding dull thud. The amp is contained in a separate enclosure, which I always like to see.


Both rear-firing ports are 2.5" in diameter and run the entire length of the cabinet, from front to rear. There's a screen on the inner-most part, so nothing can get inside the enclosure and make itself a home. I like attention to detail. Check that; I love attention to detail, and Crystal Acoustics does that in spades. The ports are flared and dimpled where they exit the back of the cabinet too, which is usually an effective way to eliminate untoward port noises. Unfortunately, it wasn't completely successful in this case.


Setup

The amp has but a single RCA connector; no speaker level input or outputs, no XLR. That spartan concept is continued with the remaining controls as well. The only things you'll find on the amp are the gain dial, a 0/180 degree phase switch, a VAR/THX switch (more on that later) and the power switch. That's it. The power switch only has settings for Off and Auto On, no Always On. I find that a bit of an odd omission, given how often people have problems with the Auto On functionality. Thankfully Auto On worked flawlessly, so it may not be an issue. There's also an LED indicator to visually determine what state the amp is in; yellowish orange for on and red for off.


The aforementioned VAR/THX switch should not be overlooked, because Crystal Acoustics believes heavily in THX certification. As a matter of fact, they've been a THX Partner since 2004, so they were one of the early adopters. In short, the VAR/THX switch enables the TX-SUB12 to act as either a "normal" subwoofer, or one that adheres to the THX standards. In the VAR setting the TX-SUB12's gain is enabled, so adjustments can be made. When set for THX the gain no longer functions and the subs output is attenuated 12dB, while the crossover is fixed at 80Hz. This allows it to operate within the THX guidelines which, in part, require multiple subwoofers. I left the switch in the VAR position for the duration of the time I had it, but even with that I found it needed to be run pretty "hot" in order to get sufficient output (1 o'clock on the subwoofers gain and +10dB output level for my receiver).


The switches, dials and lone RCA connection are clearly marked with very easy to read lettering. They're all quality pieces too. Oddly, the gain knobs position indicator is the exact opposite; it's basically just a thin groove cut into the knob, making it very difficult to read most times. Crystal Acoustics should do something to improve visibility there, because it was a bit too difficult to determine where it was set.


Listening

My living room is 13x17x8 (1768 CF), so it's not terribly large. The main seating position is approximately 11 feet from the subwoofer. All testing was done after the unit had been broken in for approximately 30 hours, which is about double my normal amount. It seemed the TX-SUB12 needed more time then usual to fully come into it's own, but once there I was rewarded with some very nice bass indeed.


My notes contained several references with words like "clarity", "detail" and "articulation". Overall I found the TX-SUB12 provides rich, clear and accurate bass. There was sufficient detail to make music listening a pleasure, something I found myself doing more with the TX-SUB12 then most of the other subwoofers I've reviewed. On occasion I did run into some limits though.


During frequency sweeps (15Hz-100Hz) I heard port chuffing on the lowest notes, which diminished and ultimately disappearing as the frequency climbed. I did hear what sounded like a bit of mechanical distress (driver bottoming out?) a few times as well, but that was very infrequent and only when I was really pushing it. Interestingly, none of those issues were really evident during the listening portion of the evaluation. I don't recall any instances where the TX-SUB12 made disturbing sounds while using it as a "normal" subwoofer - it was only when pushed very hard, or during frequency sweeps, where it made a few audible complaints.


Another curious fact is that sometimes the TX-SUB12 acted like it had a limiter, while others instances it didn't (the frequency sweeps are an example of the latter). Certain movie scenes produced a very satisfying wave of deep, clear bass, while others struck me as missing a little something in that same regard. This behavior was observed more than once.


After examining my notes further I came to the conclusion that the TX-SUB12 may be reproducing the signal more faithfully then some of the other subs I've tested recently. In other words, this sub is going to mirror the quality and quantity of the source material more so then most. I do wish the TX-SUB12 could dig just a bit deeper, but quite honestly I'd rather have faithful reproduction of the soundtrack then an 'enhanced' version. Bottom line is the TX-SUB12 sounds very nice. It's accuracy and definition are really good, and the bass it produces is full and rich.


Movies/TV

I run each test scene twice; once while seated in my normal listening position, and then a second time while sitting on the floor a few feet from the subwoofer. This allows me to hear it as I normally would, yet still affords me the opportunity to determine if the sub is straining even the slightest bit. Both tests are run at the same volume level.


Like most people I have specific DVD's and particular scenes I use when testing subwoofers. Each individual test is listed below in the format of Movie: Scene.

Lord of the Rings: Bridge of Khazad Doom - There is an ultra low frequency rumble in portions of this scene, as well as significant amounts of impact generated by numerous structures crumbling. For a subwoofer to handle all of that properly it needs to be fast, precise and capable of reaching very deep, otherwise a lot of it comes across as nothing more than annoying resonance. The TX-SUB12 did a good job here, but could have been a little better.


The bass effects were definitely clear and accurate, but the deepest of the rumbling undertones were not as pronounced as they should have been (this was one of those times I wondered if there was a limiter kicking in). The sense of danger and foreboding, which is integral for this scene to work, was a bit lacking because of that. Turning up the gain did restore some of the missing impact, but when the scene switched I had to turn it back down. That's something I'd rather not do. The blending of the various elements was spot on, with each being distinct and audible in it's own right.


My favorite part of this scene to play around with is the Balrog's roar. There's an instance when you see it for the first time that I just love to crank way up. He jumps out of a cavern and lands right behind the Fellowship with a thud, and then lets out this immense fire-breathing roar. I enjoy seeing how loud I can play that part, because when the volume goes up it just sounds cool. The TX-SUB12 did a nice job with that effect, and handled the volume with relative ease. The huge impacts created when the Balrog's feet hit the ground as he chases after the Fellowship could have been a little more concussive, but the definition was certainly there.

Collateral: Club Fever - Although this scene doesn't contain a tremendous amount of LFE information it does have a driving musical soundtrack and over-emphasized gun sounds. The music portion I've found can cause trouble for a subwoofer because it does tend to drown out the voice track in certain spots, especially if the review unit lacks clarity and speed. Because of that articulation is crucial. The TX-SUB12 had little difficulty with this scene.


The club music, in particular, was rendered beautifully. It never overwhelmed the voices or any other effect, but instead sounded like what it's supposed to; a supporting element. The gunfire wasn't as powerful as I would have liked, but it came across very clear. I actually played this scene several times because I was so impressed with the overall detail. I rarely do that in any review.

Avatar: Assault on Home Tree - For those familiar with the movie this scene has low frequencies, ultra low frequencies, explosions, gunfire, voices and enough other things going on to provide a good test of virtually every component in your system. The TX-SUB12 did the same here as in the previous test scenes; beautiful sound, but could have used a bit more depth.


The approaching battle ships and artillery rounds (both missiles and incendiaries) lacked sufficient punch to make them seem completely real. It's not that the TX-SUB12 did bad or produced weak bass -- because that's not the case at all -- it was just a touch shy of what it needed to be. All the individual sounds were distinct and easily identifiable, and came across with their individual characteristics intact, appropriately weighted so as not to create a cacophony of noise. Ironically, I liked the precision of the effects so much I also watch several other scenes; Battle for Pandora, Fall of the Heros and Eywa.

War of the Worlds: The Machine Emerges - The archetype. Perhaps the most recognized subwoofer test scene of all time comes from a movie that's about 7 years old now. The depth and volume of bass that occurs during a several minute span is simply amazing. If you want to see what your sub is capable of this scene can certainly be used as a barometer. With subterranean vibrations, exploding pavement and collapsing buildings you have ultra low, low and mid-bass frequencies pouring out of your subwoofer. One of the most punishing combinations there is, and an excellent way to really push something to the brink. Here the TX-SUB12 did quite well, including the depth (for the most part).


When the ground buckles I heard nuances that I don't recall hearing before, which was a pleasant surprise. My chair wasn't rumbling, but I loved the sound it was producing. The lightning flashes from Into The Storm weren't terribly convincing, but the detail was. The best part though was the Heat Ray scene. Far too often a subwoofer will embellish the sound of the heat ray to the point where it simply becomes the LFE version of static. Not so with the TX-SUB12; it took on a very defined sound, and made it easy to watch this scene over and over again. At The Window didn't have quite enough depth to fully create the necessary menacing effects, which was a little disappointing after how amazing Heat Ray was.

10,000 BC: Mammoth Hunt - During this scene there's either ultra low bass or mid-bass, with very little in between it seems. However, I've found this to be a good way of determining how a sub performs with nuances while being pushed hard. If it's struggling to hit the very low notes then the mid-bass suffers, and will come across as a jumbled mess (lacking in detail). If it can hit the really low notes, but isn't articulate, then it tends to sound "thick" or "heavy", losing most of it's distinction. Once again the clarity was very evident, but the depth was just a little shy.


What I envision as the sound of a mammoths foot crashing down is exactly what the TX-SUB12 produced, but the full ground shaking impact wasn't quite there. The next scene, The Stampede, left me wanting though, perhaps the only time I can say the TX-SUB12 let me down. When several dozen rampaging mammoths start to run I want to feel my room vibrating. Perhaps it's unrealistic to expect a single 12" sub to produce such a tangible sensation -- an argument you could certainly make -- but I have gotten better results from other subwoofers that were similarly configured. This was another one of those times were I wondered if a limiter had kicked in. Based upon some of my other tests I suspect the TX-SUB12 had the ability to handle this scene better, but for some reason it seemed disinclined.



After all the testing was finished I checked the amp for heat output and found it was hot to the touch. It was apparent the TX-SUB12 was working overtime. It did cool down pretty quickly though.



On a side note... when I measured the TX-SUB12 I noticed an anomaly I'm not accustom to seeing. The response tapered off rather quickly and "bounced back" below the port tuning frequency, a trait I've observed in the past with other bass reflex subwoofers. However, the extent of the bounce-back struck me as abnormally high; a full 9dB. In a sense this could explain some of the inconsistencies I observed in the sound. If the bass information happened to be centered in the deepest part of the trough then it would naturally be perceived as deficient. However, if the same source material also had output in the lower 20's or upper teens -- where the TX-SUB12 does have some presence -- then it could contribute to the somewhat misleading experienced I encountered with a few of the test scenes.


Music

I use a combination of lossy and lossless material -- MP3's and CD's -- to see how musical a subwoofer is, and in both instances the TX-SUB12 performed wonderfully. Rarely do I consider a bass reflex subwoofer "musical", but in this case I could see myself using it in a 2 channel system. It had enough speed and definition to make music listening a joy. From Pink Floyd to Kenny Wayne Shepard and on to Rush I never felt the TX-SUB12 was lacking. It wasn't afraid of volume either; I listened to some material at really elevated levels and the TX-SUB12 dutifully followed along. I started to dig deep into my music collection, grabbing some very old stuff -- Cream, Santana, Uriah Heep -- because I was having such fun. I ended up listening to music for several hours, which I normally don't do.


When I brought out the electronic music things changed a bit though. The Bass Mekanik CD played amazingly clear, but fell just a little short on the very deepest notes. Same with Bass I Love You; the TX-SUB12 gave a valiant effort, but missed some of the really low stuff. Surprisingly, it wasn't too disturbed by higher volumes. Most often Bass I Love You will trip up a subwoofer when you start to crank the volume, but for some reason the TX-SUB12 wasn't really too phased until I had it playing pretty loud. At that point the driver started to make a few unpleasant sounds, yet ironically the ports were almost silent. TechMaster's D.P.E was clear and precise, with good depth. Bassgasm played deep and was visceral, more so then most of the other electronic tracks.


You could say that last paragraph neatly sums up the review; the TX-SUB12 has the ability to do an awful lot, but sometimes it's as though it simply won't. A few of the electronic songs were reproduced amazingly well with volume, clarity and depth that belied the TX-SUB12's price and driver complement (and given how low a few of those "songs" go that's saying an awful lot). However, some of the others came off as a bit lacking, yet there was no discernible pattern as to which ones were going to be good and which weren't.


Support

Crystal Acoustics attempts to reply to all support requests within 2 business days. Some of the responses I received were within that time frame, others were not. Based upon my experience it seems like the US office may be a fairly small operation, where each person is probably responsible for several functions (for example, the individual I dealt with for support, and the person I was in contact with to obtain the review unit, turned out to be one and the same). At no time did I encounter anyone unprofessional or disrespectful - they were always friendly and polite.


Conclusion

I always read my review over at least once before writing this section, just to be certain I know exactly what I want to say. Why? Some people will just skip to the Conclusion section of a review and not read the entire thing, so I want to ensure I accurately recount my experience for those folks.


While going over the previous sections I came to the realization that it almost sounds as though I don't particularly like the TX-SUB12, or at the very least I'm disappointed with it. That's not the case at all. The reality is I do like the TX-SUB12, quite a bit frankly. It's a very nice subwoofer that's thisclose to being a great one. It's obviously built with quality materials and components. The bass is precise with excellent pitch definition and clarity, along with a tremendous ability to faithfully reproduce virtually any soundtrack. It even has the proper look; very classy, with beautiful paint. I suspect The TX-SUB12 would fit nicely into virtually any decor. My only real concerns are the port chuffing I heard during certain portions of the test, and I wish the response was more fluid at the lower end of it's frequency range (without that dip in the upper 20's). Beyond those two things there's really very little to fault the TX-SUB12 on. And even those issues come with a caveat...


The TX-SUB12 was designed to be used in a THX configuration, so you need four of them in order to achieve the full benefit. I was testing a single unit, which is technically not what it's primarily designed for, but to be honest I think the one unit did as well as any subwoofer could be expected to. I wouldn't hesitate to recommend the TX-SUB12.


The other issue -- port noise -- was only evident while running the frequency sweeps and while taking measurements; during normal listening it really wasn't noticeable, so I don't know how much of a demerit that should be either.


The TX-SUB12 is a solid example of what happens when you get just about all the fundamentals right. It's articulate and refined sound perfectly complements the sophisticated appearance. I can't find a single part of the TX-SUB12 that says "cheap" or "budget" - it's high quality throughout. This is a subwoofer for the discriminating individual, the person who values appearance and sound quality with equal importance.

 


 


 






 


 


 


 
 

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Quote:
Originally Posted by JimWilson  /t/1421038/the-official-crystal-acoustics-subwoofer-owners-thread#post_22234020


On a side note... when I measured the TX-SUB12 I noticed an anomaly I'm not accustom to seeing. The response tapered off rather quickly and "bounced back" below the port tuning frequency, a trait I've observed in the past with other bass reflex subwoofers. However, the extent of the bounce-back struck me as abnormally high; a full 9dB. In a sense this could explain some of the inconsistencies I observed in the sound. If the bass information happened to be centered in the deepest part of the trough then it would naturally be perceived as deficient. However, if the same source material also had output in the lower 20's or upper teens -- where the TX-SUB12 does have some presence -- then it could contribute to the somewhat misleading experienced I encountered with a few of the test scenes. I began to wonder if a dedicated sub EQ could ameliorate the issue and pull up that dip to the point where it would no longer be too noticeable. If so, the TX-SUB12 could be configured to provide some very impressive extension.

 

Jim, I think it's great that you're adding measurements to your reviews. However, if you post a measurement, you need to explain what the measurement is depicting. How was this measurement taken? Where was the sub positioned for the measurement? In room? Outdoor ground plane? Where was the mic positioned? Was this a "close mic'd" measurement, or a listening position measurement? How did you determine the level setting to use? Where the speakers playing during the measurement, or just the sub? Was there a crossover set, or were the mains set to "Large/Full Range"?


How do you know the dip was at the port tune? Did CA tell you the port tune, or did you just assume the port tune was the dip in the response? The ports are on the back of the sub. If this was a "close mic'd" measurement, did you measure the front AND the back of the sub?


This one single measurement in isolation, (i.e., without "context"), is pretty meaningless. Please fill in the details. More measurements of different positions would also be helpful.


Sorry, but I didn't really read all the subjective stuff. Subjective impressions of non-flat subwoofer systems are so influenced by the room and setup that they have little meaning or applicability outside that particular room and setup. However, for those mainly interested in subjective reviews, I'm sure they'll enjoy it.


Craig
 

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The measurement was taken using XTZ Room Analyzer II Pro. It was close mic, with the tip of the microphone pointed directly at the center of the dust cap and on the same plane as the leading edge of the surround. The sub was indoors, physically positioned in the center of my livingroom. No other speakers were running; the Room Analyzer handles all the signal input, so nothing else is needed. The review was sent to CA prior to me publishing it and was verified for accuracy by them (analysis and numbers included).


I measured the ports as well. The mic was pointed at the gap between them and positioned 6" from the back panel. I'm not 100% certain what you mean by "non-flat subwoofer systems", but there was absolutely no room influence to the measurements as you implied. The mic was too close for that to occur.


Here's the port measurement:

 
 

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As I suspected, this was a close mic'd measurement taken at the front of the sub. This is why you are seeing the dip at the port tune. The active driver is not "active" at the port tune; only the ports are active. This is well represented in your measurement. When you go back and measure the ports at the back of the sub, the response is flat in the range where you saw the dip, and it doesn't demonstrate the dip and "bounce back" you showed in your first measurement of just the driver. This demonstrates that the ports are the "active" SPL generator in the range of the port tune. Now, you need to "sum" the response of the ports with the response of the active driver to get the complete response of the subwoofer. This can be done mathematically, but the best way to do that is to measure it outdoors and ground-plane.


When I referenced "non-flat subwoofer systems" I intended to mean in-room systems that have not been corrected for the room. Your close-mic'd measurements will not be reflective of the measurements of the sub at your listening position. The LP measurements will be a lot less flat that your close mic'd measurements. They will be heavily influenced by *your* room, and the placement and setup of the sub(s) within *your* room. Where your close-mic'd measurements will be relatively flat, (once you "sum" the driver and the ports), your in-room response will be anything but flat. It could be +/- 20 dB or more. More importantly, *your* in-room response will be significantly different than virtually any other room in the universe. Therefore, what you *hear* in your room will be substantially different than what anyone else will hear with the same sub in another room. This is why I put little value on subjective reviews, especially reviews of subwoofers. The ROOM is the biggest factor in what is HEARD by the reviewer, and what is heard from any one subwoofer in your room will be completely different from what anyone else will hear from that same subwoofer in their own room.


IMO, and IME, baseline measurements of a subwoofer, (outdoor, ground-plane optimally, or closemic'd, in-room as a second best option), are the only useful things that can be reported. Once the baseline response is known, it's up to the user to try to accomplish that response in their room.


For your reference, here is the process I went through to document and adjust the response of my subs in my room: http://www.avsforum.com/t/759877/seaton-sound-submersive1/4500#post_19446901


In addition, there is a lot of info about subwoofer measurements on the Data Bass website: http://www.data-bass.com/data?page=home


Craig
 

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Jim,


Judging from the port FR graph you took, and the omnimic measurements I took in my room a couple months back, it appears this sub is port tuned somewhere right in the low 20hz region. But for some reason that doesn't seem to align with the Sound and Vision measurements where it appears to fall off after 30hz? Did Crystal Acoustics give you a idea on the true port tuning? Did you happen to capture a FR graph from your listening position? It would also be interesting to see what the FR ended up being where you sat (when not on the floor a couple feet away). If not, not big deal -- I was just curious.


I've dealt with Crystal Acoustic's customer support and also received a very positive experience with a damaged tower replacement that was the fault of one of my over enthusiastic cats!
 

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Quote:
Originally Posted by Archaea  /t/1421038/the-official-crystal-acoustics-subwoofer-owners-thread#post_22234813


Jim,

Judging from the port FR graph you took, and the omnimic measurements I took in my room a couple months back, it appears this sub is port tuned somewhere right in the low 20hz region. But for some reason that doesn't seem to align with the Sound and Vision measurements where it appears to fall off after 30hz? Did Crystal Acoustics give you a idea on the true port tuning? Did you happen to capture a FR graph from your listening position? It would also be interesting to see what the FR ended up being where you sat (when not on the floor a couple feet away). If not, not big deal -- I was just curious.

I've dealt with Crystal Acoustic's customer support and also received a very positive experience with a damaged tower replacement that was the fault of one of my over enthusiastic cats!
Different sub. S&V measured the THX select version and the TX is the Utra 2 version. Check out the review on S&V website and then read the Secrets review which discusses the confusing nomenclature.
 

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Quote:
Originally Posted by craig john  /t/1421038/the-official-crystal-acoustics-subwoofer-owners-thread#post_22234692


IMO, and IME, baseline measurements of a subwoofer, (outdoor, ground-plane optimally, or closemic'd, in-room as a second best option), are the only useful things that can be reported. Once the baseline response is known, it's up to the user to try to accomplish that response in their room.

Ground plane is not feasible in my situation unfortunately, which is why I opted for close mic instead. To be honest, I simply don't have the time to get much deeper into this then I already am. This is a hobby -- alright, passion -- of mine, but I don't want it to become another job. Once it's a chore then I cease to do it. The amount of time and effort I already expend is considerable, and increasing by the day it seems.


Right now I have 3 brand new subs waiting to be tested, and 2 more on the way. On top of that there are 3 others I'm negotiating with, all of which I'd say have a better then 50/50 chance of happening. That's a lot of work. Of course as (bad) luck would have it my 15 month old Panasonic plasma coughed up a hairball and is in the shop for repair, so I can't even test any of them. It's a nice pile to look at though.
Don't get me wrong -- I'm having a blast -- but it does seem to be getting away from me at times.

Quote:
Originally Posted by craig john  /t/1421038/the-official-crystal-acoustics-subwoofer-owners-thread#post_22234692


For your reference, here is the process I went through to document and adjust the response of my subs in my room: http://www.avsforum.com/t/759877/seaton-sound-submersive1/4500#post_19446901

Man, what an ordeal! You're more dedicated then I am (and apparently quite a bit better off financially as well
). I've only gotten through part one and already I'm wondering how you stuck to it.


BTW... I noticed your graphs are from an XTZ setup. Do you know how to sum different measurements together? For the life of me I can't see how to do it. I tried when I was testing the TX-SUB12, but was unable to figure it out.

Quote:
Originally Posted by craig john  /t/1421038/the-official-crystal-acoustics-subwoofer-owners-thread#post_22234692


In addition, there is a lot of info about subwoofer measurements on the Data Bass website: http://www.data-bass.com/data?page=home

I know this site well. I have spent many hours going over it. Josh and I have exchanged a few emails as well. It was nice to pick his brain.
 

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Quote:
Originally Posted by Randy Bessinger  /t/1421038/the-official-crystal-acoustics-subwoofer-owners-thread#post_22235787


Different sub. S&V measured the THX select version and the TX is the Utra 2 version. Check out the review on S&V website and then read the Secrets review which discusses the confusing nomenclature.

Thanks for the heads-up on the confusing nomenclature. The Ultra 2 version is a more impressive performer (at the lowest frequencies) than the Select model. We still lack the CEA 2010 data for either model. If and when the CEA 2010 data is available valid comparisons will be possible



Thanks again for the heads-up.
 

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Quote:
Originally Posted by spyboy  /t/1421038/the-official-crystal-acoustics-subwoofer-owners-thread#post_22235975


Thanks for the heads-up on the confusing nomenclature. The Ultra 2 version is a more impressive performer (at the lowest frequencies) than the Select model. We still lack the CEA 2010 data for either model. If and when the CEA 2010 data is available valid comparisons will be possible


Thanks again for the heads-up.
No problem.
 
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