Official Rythmik Audio Subwoofer thread - Page 759 - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 12129Likes
Reply
 
Thread Tools
post #22741 of 39082 Old 01-31-2016, 10:58 PM
Senior Member
 
Jacob B's Avatar
 
Join Date: Apr 2001
Posts: 458
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
Liked: 33
Quote:
Originally Posted by MrGrey View Post
No i used it to reduce the 55hz peak i had and then smooth out the rest with REW and a house curve. it worked really well. too bad the FV15HP doesn't have a PEQ screen where we can reduce two specific frequency's at once.
What is the benefit of using the FV15HP PEQ, which is in the analogue domain, to smooth a single peak, as opposed to letting an EQ in the digital domain take care of everything (like Audyssey etc)?

Cheers,
Jacob
Jacob B is offline  
Sponsored Links
Advertisement
 
post #22742 of 39082 Old 02-01-2016, 05:54 AM
Writer & Reviewer
 
JimWilson's Avatar
 
Join Date: Oct 2010
Location: Somewhere in New Joisey
Posts: 8,060
Mentioned: 101 Post(s)
Tagged: 0 Thread(s)
Quoted: 2121 Post(s)
Liked: 3148
Quote:
Originally Posted by Jacob B View Post
What is the benefit of using the FV15HP PEQ, which is in the analogue domain, to smooth a single peak, as opposed to letting an EQ in the digital domain take care of everything (like Audyssey etc)?
So long as the peak is leveled out, what difference does it make where it occurred? I'm not being antagonistic when I ask that, just curious as to why it would be germane. I'm only interested in what the output sounds like when it hits my ears, not where it was adjusted.

With regards to the PEQ itself... not everyone has a sound processor with an auto-EQ system like Audyseey, YPAO, MCACC, etc. In the two channel world very few people have that in their electronics chain, and even if they do some folks just flat out don't like using them because it alters the sound in a way they aren't comfortable with. In that case, the PEQ gives them the ability to tailor the sound manually.

 
If you take yourself too seriously expect me to do the exact opposite...
JimWilson is offline  
post #22743 of 39082 Old 02-01-2016, 07:32 AM
AVS Forum Special Member
 
grasshoppers's Avatar
 
Join Date: Dec 2008
Location: aridzona
Posts: 3,729
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 952 Post(s)
Liked: 698
Quote:
Originally Posted by Jacob B View Post
What is the benefit of using the FV15HP PEQ, which is in the analogue domain, to smooth a single peak, as opposed to letting an EQ in the digital domain take care of everything (like Audyssey etc)?

Cheers,
Jacob
I read somewhere that by using PEQ to smooth
A peak more Audyssey resources (which are limited)
Could be used (applied) to further correct other
Issues more effectively. Hopefully that makes sense.

(Main)-Marantz 6012*Outlaw Audio M2200*Rythmik F12 subs*Paradigm Signature S6,C1,S1
******Harman Kardon DMC1000 (music)-Assassin HTPC (movies).
(Bedroom)-Marantz SR5003*Paradigm Studio 40,SE Center,SE One*SVS SB-2000 subs*Sony S6200
(Music room)-Outlaw Audio RR2150*Sierra Two ribbon speakers*Rythmik L12 sub*Yamaha CDR-HD1500
grasshoppers is offline  
Sponsored Links
Advertisement
 
post #22744 of 39082 Old 02-01-2016, 07:35 AM
Senior Member
 
Jacob B's Avatar
 
Join Date: Apr 2001
Posts: 458
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
Liked: 33
Quote:
Originally Posted by JimWilson View Post
So long as the peak is leveled out, what difference does it make where it occurred? I'm not being antagonistic when I ask that, just curious as to why it would be germane. I'm only interested in what the output sounds like when it hits my ears, not where it was adjusted.

With regards to the PEQ itself... not everyone has a sound processor with an auto-EQ system like Audyseey, YPAO, MCACC, etc. In the two channel world very few people have that in their electronics chain, and even if they do some folks just flat out don't like using them because it alters the sound in a way they aren't comfortable with. In that case, the PEQ gives them the ability to tailor the sound manually.
I am not qualified to present the argument, but some claim that SUB EQ performed strictly in the digital domain (for digital sources) has less unwanted side effects on the sound - in other words, there is more to good sound than a perceived flat frequency response in the bass region or a perfect housecurve.

I understand that many dedicated 2 Ch systems will not have SUB EQ. In addition, if the source is analogue, a digital EQ processor might not be desired.

Cheers,
Jacob

PS any comments on the mono mid bass issue I have...?

Last edited by Jacob B; 02-01-2016 at 07:45 AM.
Jacob B is offline  
post #22745 of 39082 Old 02-01-2016, 09:28 AM
AVS Forum Addicted Member
 
DonH50's Avatar
 
Join Date: Feb 2010
Location: Monument CO
Posts: 12,038
Mentioned: 65 Post(s)
Tagged: 0 Thread(s)
Quoted: 3101 Post(s)
Liked: 3042
Quote:
Originally Posted by Jacob B View Post
I really need a processor able to manage stereo subs...!
If you really want to use them as stereo subs, it may be easier to buy an external crossover like a miniDSP or analog dbx 223, and use it to cross over to the sub arrays. That way your AVR "sees" a pair of full-range speakers (set them to "large") and will treat (compensate) as such. That is the way I ran my system for many years. It works if the subs and mains are close together so the AVR can handle them as single (L/R) speakers.

HTH - Don

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
DonH50 is offline  
post #22746 of 39082 Old 02-01-2016, 10:40 PM
Senior Member
 
Jacob B's Avatar
 
Join Date: Apr 2001
Posts: 458
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
Liked: 33
Quote:
Originally Posted by DonH50 View Post
If you really want to use them as stereo subs, it may be easier to buy an external crossover like a miniDSP or analog dbx 223, and use it to cross over to the sub arrays. That way your AVR "sees" a pair of full-range speakers (set them to "large") and will treat (compensate) as such. That is the way I ran my system for many years. It works if the subs and mains are close together so the AVR can handle them as single (L/R) speakers.

HTH - Don
Don,
The subs are pretty close to the main speakers - right next to on the left and about a foot on the right. See picture below. Since the picture was taken, I have moved the right main speaker 1½ feet to the right.


I am considering buying the Lyngdorf TDAi 2170 to drive the main speakers and bass manage the subs. It can manage stereo subs and has a proprietary 2.2 EQ (Room Perfect). I would do exactly how you suggest: set the main speakers to large + no sub in the AVR and the connect the subs to the Lyngdorf. Then either turn off Audyssey XT32 on the AVR or set it to BYPASS FL/FR.
http://hometheaterhifi.com/reviews/a...lifier-review/

Cheers,
Jacob

Last edited by Jacob B; 02-01-2016 at 10:59 PM.
Jacob B is offline  
post #22747 of 39082 Old 02-02-2016, 09:31 PM
AVS Forum Special Member
 
raynist's Avatar
 
Join Date: Dec 2002
Location: PA
Posts: 4,477
Mentioned: 95 Post(s)
Tagged: 0 Thread(s)
Quoted: 2027 Post(s)
Liked: 2096
Is there anyone here that is from the Pittsburgh Metro or surrounding area?

https://www.avsforum.com/forum/61-are...l#post41214433
raynist is offline  
post #22748 of 39082 Old 02-03-2016, 10:33 AM
AVS Forum Addicted Member
 
DonH50's Avatar
 
Join Date: Feb 2010
Location: Monument CO
Posts: 12,038
Mentioned: 65 Post(s)
Tagged: 0 Thread(s)
Quoted: 3101 Post(s)
Liked: 3042
Quote:
Originally Posted by Jacob B View Post
Don,
The subs are pretty close to the main speakers - right next to on the left and about a foot on the right. See picture below. Since the picture was taken, I have moved the right main speaker 1½ feet to the right.

<image elided>

I am considering buying the Lyngdorf TDAi 2170 to drive the main speakers and bass manage the subs. It can manage stereo subs and has a proprietary 2.2 EQ (Room Perfect). I would do exactly how you suggest: set the main speakers to large + no sub in the AVR and the connect the subs to the Lyngdorf. Then either turn off Audyssey XT32 on the AVR or set it to BYPASS FL/FR.
http://hometheaterhifi.com/reviews/a...lifier-review/

Cheers,
Jacob
Hmmm... I would leave XT32 running to deal with the speakers and integration of subs to mains, your call... The external crossover is a cheap solution but only if you are using an external amplifier to drive the L/R speakers or have a pre-out/in loop on your AVR, something rare these days.

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
DonH50 is offline  
post #22749 of 39082 Old 02-03-2016, 11:52 AM
AVS Forum Special Member
 
enricoclaudio's Avatar
 
Join Date: Aug 2005
Location: Houston, TX
Posts: 5,491
Mentioned: 254 Post(s)
Tagged: 0 Thread(s)
Quoted: 3595 Post(s)
Liked: 4283
Hi guys,

As I mentioned before Chris Fogel, from Hyperion Sound @ ELBO Studios in Glendale, CA got an FV15HP back in June 2015 for his film mastering studio. Today we got a second order from him for a pair of F12s for a small stereo room. He is very impressed with the capabilities of the FV15HP. So I just wanted to share with you guys the list of the movies he already mastered using the FV15HP:

Creed
Spy
Trumbo
Zoolander 2
5th Wave
Ghostbusters (still in production)
Birth of a Nation (just won Sundance)
Halo 5 soundtrack (game)

Enrico Castagnetti @ Rythmik Audio - Dialing In Rythmik Audio Subwoofers
Media Room: Sierra Towers w/RAAL, Horizon w/RAAL, Sierra 2s & Lunas | Rythmik F12SE(x2) + FV25HP | Denon X6500H | Panny 820 + ATV 4K | Bluesound Node 2 | 92" Stewart ST100 | Sony VW295ES |
Desktop: Dynaudio BM5 mkIII | Rythmik L22 | Apogee Quartet | 27" iMac| Bedroom: B&W 685 S2 | Rythmik LVX12 | Marantz SR6013 | Sony X700 + ATV 4K | Sony XBR-65Z9D |
enricoclaudio is offline  
post #22750 of 39082 Old 02-03-2016, 02:51 PM
AVS Forum Addicted Member
 
PlasmaPZ80U's Avatar
 
Join Date: Feb 2009
Posts: 12,142
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
Quoted: 2776 Post(s)
Liked: 966
I switched to a 3.1 setup from a 5.1 one since my surround placement was poor. SQ improved overall and I get more bass from the front now (surrounds were much smaller than mains and now that info is downmixed into the mains). I also had the chance to move the sub a bit and give it more breathing room. Anyhow, my sub is playing higher now, as the measurement below shows:
Attached Thumbnails
Click image for larger version

Name:	sub only (LFE) with Line In 12dB LPF slope.png
Views:	111
Size:	57.7 KB
ID:	1228457  

Samsung 55" MU8000
Yamaha RX-A2070
KEF Q150 Bookshelf x 5
Rythmik L12 Sealed Subwoofer
PlasmaPZ80U is offline  
post #22751 of 39082 Old 02-03-2016, 02:56 PM
AVS Forum Addicted Member
 
PlasmaPZ80U's Avatar
 
Join Date: Feb 2009
Posts: 12,142
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
Quoted: 2776 Post(s)
Liked: 966
Also, I'm finding I don't need to set the sw trim as hot anymore (+2dB is plenty whereas before it was +4dB). I think the added bass comes from the surround info playing through the mains, which are much bigger and also because it now seems all bass comes from the front of the room. Since all bass is summed mono, the extra 80Hz and up bass from the mains and the sub 80Hz bass coming apparently from just the front makes it actually louder/seem louder.

Samsung 55" MU8000
Yamaha RX-A2070
KEF Q150 Bookshelf x 5
Rythmik L12 Sealed Subwoofer
PlasmaPZ80U is offline  
post #22752 of 39082 Old 02-04-2016, 09:49 AM
AVS Forum Special Member
 
enricoclaudio's Avatar
 
Join Date: Aug 2005
Location: Houston, TX
Posts: 5,491
Mentioned: 254 Post(s)
Tagged: 0 Thread(s)
Quoted: 3595 Post(s)
Liked: 4283
The container came in today so we have L12 and LV12R back in stock!! A lot of shipping is happening today so if you are on the waiting list for any of these models most probably you will receive an UPS email with tracking number in a few hours.

Enrico Castagnetti @ Rythmik Audio - Dialing In Rythmik Audio Subwoofers
Media Room: Sierra Towers w/RAAL, Horizon w/RAAL, Sierra 2s & Lunas | Rythmik F12SE(x2) + FV25HP | Denon X6500H | Panny 820 + ATV 4K | Bluesound Node 2 | 92" Stewart ST100 | Sony VW295ES |
Desktop: Dynaudio BM5 mkIII | Rythmik L22 | Apogee Quartet | 27" iMac| Bedroom: B&W 685 S2 | Rythmik LVX12 | Marantz SR6013 | Sony X700 + ATV 4K | Sony XBR-65Z9D |
enricoclaudio is offline  
post #22753 of 39082 Old 02-04-2016, 07:55 PM
AVS Forum Special Member
 
RTROSE's Avatar
 
Join Date: Dec 2005
Location: South Central Indiana
Posts: 6,705
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 200 Post(s)
Liked: 176
Hey it's February, any updates on the prototypes? Inquiring minds want to know. I know that Rythmik is a small company where you guys wear multiple hats so I understand there is only so much you can do in a day, but having said that I do have a suggestion. On your website you should consider adding a future projects, or in the works section to keep everyone updated about new developments and possible future products. You might even find that it creates some additional buzz for your company. Anyway just a suggestion. Now back to our regularly scheduled subwoofer forum.


Regards,

RTROSE

My (slower than molasses) HT build here.
Now a Certified Carpet Counselor and Plumbing Counselor (Self given titles - pay no attention).
Enjoying my "almost done" theater.
RTROSE is offline  
post #22754 of 39082 Old 02-05-2016, 05:39 PM
Member
 
Namikis's Avatar
 
Join Date: Apr 2011
Location: McMurray PA
Posts: 26
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Liked: 21
I have had a couple of minor problems with my Rhythmik FV15HP - and the company's customer service has been very good in both cases. The first plate amp failed due to and issue with bad capacitors in an early manufacturing batch. I emailed them and within hours Brian Ding contacted me and determined what the issue was and decided to send me a new plate. Fast forward to last week - a year later - I called to ask for help replacing the fabric on the grill, which I suspect was attacked by one of my cats (i have no video proof, just circumstantial evidence). Brian helped me again, suggesting he could have a new grill shipped to me at cost (very affordable!). I received it yesterday. Really happy with the sub, but even happier with the support when things go wrong. Thank you Brian!!

Last edited by Namikis; 02-05-2016 at 06:24 PM.
Namikis is offline  
post #22755 of 39082 Old 02-05-2016, 07:22 PM
AVS Forum Special Member
 
RTROSE's Avatar
 
Join Date: Dec 2005
Location: South Central Indiana
Posts: 6,705
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 200 Post(s)
Liked: 176
Quote:
Originally Posted by Namikis View Post
I have had a couple of minor problems with my Rhythmik FV15HP - and the company's customer service has been very good in both cases. The first plate amp failed due to and issue with bad capacitors in an early manufacturing batch. I emailed them and within hours Brian Ding contacted me and determined what the issue was and decided to send me a new plate. Fast forward to last week - a year later - I called to ask for help replacing the fabric on the grill, which I suspect was attacked by one of my cats (i have no video proof, just circumstantial evidence). Brian helped me again, suggesting he could have a new grill shipped to me at cost (very affordable!). I received it yesterday. Really happy with the sub, but even happier with the support when things go wrong. Thank you Brian!!
I will second your thoughts and experiences regarding Rythmik's support of their products. Too often nowadays the customer is all but forgotten in customer service. However this is not the case with Rythmik they go out of their way to make sure the customer is the focus of their business before, during, and after the sale.

Regards,

RTROSE
turbojohngt likes this.

My (slower than molasses) HT build here.
Now a Certified Carpet Counselor and Plumbing Counselor (Self given titles - pay no attention).
Enjoying my "almost done" theater.
RTROSE is offline  
post #22756 of 39082 Old 02-05-2016, 07:26 PM
Member
 
Namikis's Avatar
 
Join Date: Apr 2011
Location: McMurray PA
Posts: 26
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Liked: 21
Quote:
Originally Posted by raynist View Post
Is there anyone here that is from the Pittsburgh Metro or surrounding area?

https://www.avsforum.com/forum/61-are...l#post41214433
I am in the Pitt area, but you already knew that
Namikis is offline  
post #22757 of 39082 Old 02-06-2016, 05:56 AM
Senior Member
 
bob_m10's Avatar
 
Join Date: Mar 2004
Posts: 330
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
Liked: 19
Quote:
Originally Posted by BDP24 View Post
Excellent idea. And if you get the DIY F15HP kit, you can have the enclosure made with an internal volume of up to 4 cu.ft. (the factory one is 3 cu.ft.), to maximize the output. And the enclosure can be any shape you want, great if you have space issues.
Is it normal to have such a wide range 3-4 cu. ft. in internal volume for a specific driver or is this where the servo is helping out?

I am looking to build a 15" kit as well, based on Rythmik's posted DIY plans for the DS1500 sealed, it works out to ~4.36 cu. ft for the empty cabinet. Then when you subtract for driver, amp and bracing it probably works out to the 4 cu. ft?

Internal dimension for DS1500 plans: 21 x 16.5 x 21.75 = 4.36 cu ft.

Thanks

Last edited by bob_m10; 02-06-2016 at 10:54 AM.
bob_m10 is offline  
post #22758 of 39082 Old 02-06-2016, 08:08 PM
AVS Forum Addicted Member
 
DonH50's Avatar
 
Join Date: Feb 2010
Location: Monument CO
Posts: 12,038
Mentioned: 65 Post(s)
Tagged: 0 Thread(s)
Quoted: 3101 Post(s)
Liked: 3042
You'll get higher efficiency and perhaps a bit more output in the larger enclosure.

The commercial product's enclosure size is to meet shipping requirements (per Brian) and is a compromise in performance; the servo keeps the frequency response and linear output but can't compensate for efficiency a larger enclosure provides.
bob_m10 likes this.

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
DonH50 is offline  
post #22759 of 39082 Old 02-09-2016, 02:47 AM
Senior Member
 
Jacob B's Avatar
 
Join Date: Apr 2001
Posts: 458
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 137 Post(s)
Liked: 33
Quote:
Originally Posted by DonH50 View Post
Hmmm... I would leave XT32 running to deal with the speakers and integration of subs to mains, your call... The external crossover is a cheap solution but only if you are using an external amplifier to drive the L/R speakers or have a pre-out/in loop on your AVR, something rare these days.
If I bought the Lyngdorf TDAi2170 as mentioned, it would power the front L/R speaker. AVR would be set to Left and right = LARGE, and NO SUB.
The Lyngdorf would bass manage as well as EQ Front L/R and the two pairs of subs (stereo, i.e. 2.2), and the AVR (Denon X5200W) would bass manage and EQ (XT32) the center and all the surround speakers.

I will test it in the near future, and see if it will fix my problem of a collapsed stereo soundstage with crossover set to 80 Hz and higher (200 Hz is desired due to the two E15HP+FM8 stacks...) :-)

Cheers,
Jacob
klh007 likes this.
Jacob B is offline  
post #22760 of 39082 Old 02-09-2016, 06:00 PM
Advanced Member
 
meli's Avatar
 
Join Date: Jun 2003
Location: Ridgewood, NJ
Posts: 618
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 318 Post(s)
Liked: 91
Is it generally recommend to use the result from Rythmik's Subtuner to override the distance setting determined by Audyssey XT32 in my A/V receiver? I have the Rythmik L22 and a Marantz 6010 receiver

http://www.rythmikaudio.com/subtuner2.html
(I use Firefox to run the subtuner)

Last edited by meli; 02-09-2016 at 06:31 PM.
meli is offline  
post #22761 of 39082 Old 02-10-2016, 06:29 AM
Writer & Reviewer
 
JimWilson's Avatar
 
Join Date: Oct 2010
Location: Somewhere in New Joisey
Posts: 8,060
Mentioned: 101 Post(s)
Tagged: 0 Thread(s)
Quoted: 2121 Post(s)
Liked: 3148
Quote:
Originally Posted by meli View Post
Is it generally recommend to use the result from Rythmik's Subtuner to override the distance setting determined by Audyssey XT32 in my A/V receiver? I have the Rythmik L22 and a Marantz 6010 receiver
Audyseey is good at what it does, but it's certainly not infallible (I can't comment on Rythmik's tuner because I've never gotten it to run on either of the browsers I use, Opera and IE). There are so many variables to consider that neither could be 100% accurate though. They should be used as a guide/reference, but ultimately your ears will tell you what sounds best.
meli likes this.

 
If you take yourself too seriously expect me to do the exact opposite...
JimWilson is offline  
post #22762 of 39082 Old 02-10-2016, 07:52 AM
AVS Forum Special Member
 
Rythmik's Avatar
 
Join Date: Aug 2005
Location: Austin
Posts: 2,253
Mentioned: 117 Post(s)
Tagged: 0 Thread(s)
Quoted: 425 Post(s)
Liked: 699
Quote:
Originally Posted by RTROSE View Post
Hey it's February, any updates on the prototypes? Inquiring minds want to know. I know that Rythmik is a small company where you guys wear multiple hats so I understand there is only so much you can do in a day, but having said that I do have a suggestion. On your website you should consider adding a future projects, or in the works section to keep everyone updated about new developments and possible future products. You might even find that it creates some additional buzz for your company. Anyway just a suggestion. Now back to our regularly scheduled subwoofer forum.


Regards,

RTROSE

I will do a verbal update here. I am testing the enclosure of F25. The tuning frequency turns out to be about 17% higher than that of FV15HP 1 port mode. So I need to increase the enclosure height and port length by about 12%. My goal is to get the tuning frequency to within 5% of FV15HP 1 port. It is a bit tougher because FV25 uses 3 ports. Next I will test the enclosure of FV18 which uses 2 port.
Rythmik is offline  
post #22763 of 39082 Old 02-10-2016, 01:20 PM
Senior Member
 
bob_m10's Avatar
 
Join Date: Mar 2004
Posts: 330
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 88 Post(s)
Liked: 19
Hi All,

I plan on building either the 12” or 15” Rythmick using one of their kits. The good folks at Rythmik have suggested the 15” for my room and will most likely follow their advice. My indecisiveness is mainly around the size of the build and thinking a bit down the road where 2 -12” may be more of a possibility than 2 -15”

My room is 14x22x7.5 and opens up into a similar sized area. . My mains are NHT Classic 3’s which have a 6” woofer. I generally listen at low volumes levels and am certainly in the quality vs quantity camp when it comes to bass. Is there any reason for selecting the 12” ci over the 15 ci besides space considerations? Curious if any of you have upgraded from an F12 to F15?

Thanks for any guidance.
bob_m10 is offline  
post #22764 of 39082 Old 02-10-2016, 01:49 PM
AVS Forum Special Member
 
dominguez1's Avatar
 
Join Date: Dec 2008
Posts: 3,345
Mentioned: 163 Post(s)
Tagged: 0 Thread(s)
Quoted: 1172 Post(s)
Liked: 1111
Quote:
Originally Posted by Rythmik View Post
I will do a verbal update here. I am testing the enclosure of F25. The tuning frequency turns out to be about 17% higher than that of FV15HP 1 port mode. So I need to increase the enclosure height and port length by about 12%. My goal is to get the tuning frequency to within 5% of FV15HP 1 port. It is a bit tougher because FV25 uses 3 ports. Next I will test the enclosure of FV18 which uses 2 port.
Will the ports be firing in the same direction as the drivers for either the fv25 or fv18?
turbojohngt likes this.
dominguez1 is offline  
post #22765 of 39082 Old 02-10-2016, 03:23 PM
Writer & Reviewer
 
JimWilson's Avatar
 
Join Date: Oct 2010
Location: Somewhere in New Joisey
Posts: 8,060
Mentioned: 101 Post(s)
Tagged: 0 Thread(s)
Quoted: 2121 Post(s)
Liked: 3148
Quote:
Originally Posted by bob_m10 View Post
My room is 14x22x7.5 and opens up into a similar sized area. . My mains are NHT Classic 3’s which have a 6” woofer. I generally listen at low volumes levels and am certainly in the quality vs quantity camp when it comes to bass. Is there any reason for selecting the 12” ci over the 15 ci besides space considerations? Curious if any of you have upgraded from an F12 to F15?
The room in question is over 2300 ft^3, so right off the bat most subs with a 12" driver are going to be working pretty hard. Factor in the "opens up into a similar sized area" and 15" subs become more appropriate. This assumes you're using one; if you opt for duals than 12's might not be overwhelmed.
bob_m10 likes this.

 
If you take yourself too seriously expect me to do the exact opposite...
JimWilson is offline  
post #22766 of 39082 Old 02-10-2016, 06:03 PM
AVS Forum Special Member
 
RTROSE's Avatar
 
Join Date: Dec 2005
Location: South Central Indiana
Posts: 6,705
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 200 Post(s)
Liked: 176
Quote:
Originally Posted by Rythmik View Post
I will do a verbal update here. I am testing the enclosure of F25. The tuning frequency turns out to be about 17% higher than that of FV15HP 1 port mode. So I need to increase the enclosure height and port length by about 12%. My goal is to get the tuning frequency to within 5% of FV15HP 1 port. It is a bit tougher because FV25 uses 3 ports. Next I will test the enclosure of FV18 which uses 2 port.
Exciting news! Thanks for the update. Looking forward to seeing these come to fruition.

Regards,

RTROSE
turbojohngt likes this.

My (slower than molasses) HT build here.
Now a Certified Carpet Counselor and Plumbing Counselor (Self given titles - pay no attention).
Enjoying my "almost done" theater.
RTROSE is offline  
post #22767 of 39082 Old 02-11-2016, 11:36 AM
Member
 
Cardiff Kook's Avatar
 
Join Date: Mar 2013
Location: Chicago and San Diego
Posts: 76
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Liked: 13
I have a very general sub/main integration question for the forum...

Is it best when integrating the sub and mains to
1) align the timing perfectly OR
2) is it best to tailor the timing to smooth the frequency response?

For example, let's say that there is overlap from forty to eighty hz, and that perfect time alignment creates a peak at 60 but is smooth everywhere else. However by delaying the sub I can smooth out the peak. Is it advisable to intentionally misalign the timing to improve the freq response?

The reason I ask is because it seems apparent that the benefit of multiple subs is to specifically to create the situation where peaks and valleys hit at different times thus smoothing out. But is this also true at higher bass frequencies? When does it get objectionable? Is smoother freq response always the goal or is time alignment important too? When they conflict which is most important?

Seems like something important for us to all know. All input is welcome!
Cardiff Kook is offline  
post #22768 of 39082 Old 02-11-2016, 11:37 AM
Member
 
Cardiff Kook's Avatar
 
Join Date: Mar 2013
Location: Chicago and San Diego
Posts: 76
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Liked: 13
I have a very general sub/main integration question for the forum...

Is it best when integrating the sub and mains to
1) align the timing perfectly OR
2) is it best to tailor the timing to smooth the frequency response?

For example, let's say that there is overlap from forty to eighty hz, and that perfect time alignment creates a peak at 60 but is smooth everywhere else. However by delaying the sub I can smooth out the peak. Is it advisable to intentionally misalign the timing to improve the freq response?

The reason I ask is because it seems apparent that the benefit of multiple subs is to specifically to create the situation where peaks and valleys hit at different times thus smoothing out. But is this also true at higher bass frequencies? When does it get objectionable? Is smoother freq response always the goal or is time alignment important too? When they conflict which is most important?

Seems like something important for us to all know. All input is welcome!
Cardiff Kook is offline  
post #22769 of 39082 Old 02-11-2016, 12:05 PM
AVS Forum Addicted Member
 
DonH50's Avatar
 
Join Date: Feb 2010
Location: Monument CO
Posts: 12,038
Mentioned: 65 Post(s)
Tagged: 0 Thread(s)
Quoted: 3101 Post(s)
Liked: 3042
If timing is aligned properly then frequency response should follow and vice-versa. Fourier tells us they are the same signal whether expressed in the time or frequency domain. I am not sure how you are determining "perfect time alignment". Time delay and phase shift in the system make it (highly) likely that different phase shifts will be required at different frequencies to account for things like crossovers, physical distance, interaction with the room, etc.

The quick answer is that I would adjust for best frequency response since we hear changes in frequency response more readily than transient time events. Our ears, and brain, integrate the signals. That said, I always check impulse responses, and even with just frequency response you want to make sure you aren't wasting a bunch of power trying to feed a null.

Note time alignment also changes the relative phase, all of which impacts those peaks and valleys you hear and measure.
enricoclaudio likes this.

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
DonH50 is offline  
post #22770 of 39082 Old 02-11-2016, 01:30 PM
AVS Forum Special Member
 
qguy's Avatar
 
Join Date: Dec 2008
Posts: 1,226
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 178 Post(s)
Liked: 104
pics or it did not happen

... with the F12 beside the two behemoths for size comparison Pleaaaasssseeeeeeee...


Quote:
Originally Posted by Rythmik View Post
I will do a verbal update here. I am testing the enclosure of F25. The tuning frequency turns out to be about 17% higher than that of FV15HP 1 port mode. So I need to increase the enclosure height and port length by about 12%. My goal is to get the tuning frequency to within 5% of FV15HP 1 port. It is a bit tougher because FV25 uses 3 ports. Next I will test the enclosure of FV18 which uses 2 port.
turbojohngt likes this.
qguy is offline  
Sponsored Links
Advertisement
 
Reply Subwoofers, Bass, and Transducers

Tags
f12g subwoofer , integra dtc 9.8 , lv12r , Rythmik , Rythmik Audio , Rythmik Audio F12 Direct Servo Subwoofer , Rythmik Audio F15 Subwoofer , servo sub

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off