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Old 06-25-2014, 01:18 AM
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^^ +1. Keep that amp. It is a very good amp. I had the very first Sherbourn 5x200W (5 separate mono blocks in one chassis) over a decade ago and liked how it sounded. I wish I didn't sell it. I am still pissed about not getting that 7-350 amp a while back on sale for $950 as I didnot need it. I still do not need an amp but it was so cheap. I have been running my HTPC for about 10yrs now. It is sooooo cheap to build a nice one now.
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Old 06-25-2014, 02:51 PM - Thread Starter
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Still traveling, so no ULF calc update yet. Likely in the next few days.

Regarding the scaling...agree with the X axis and Y axis precision that have been mentioned. Definitely 5db for y axis.

Now for smoothing...IMO, it depends what you're trying to do.

I typically use no smoothing to ensure that I'm not hiding any peaks or nulls. Once I've dialed the response in so that I'm confident that those don't exist, I'll eq at the 1/6 scale. Once that is to my liking, I'll then flip to unsmoothed to ensure there are still no peaks or nulls I created in the process. Assuming I'm good there, I'll post my final curve at 1/6 smoothing.

Ultimately (from what I've gathered on this forum),1/6 smoothing is what we hear. If that's the case, then I want my final frequency response graph to show that.

However, if you're posting your response because you want assistance with your FR, or are comparing subwoofers, further precision is beneficial to really help reveal any potential issues. The minimum however for any posting of a response would be 1/6 scaling.

IMO, YMMV
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Old 06-26-2014, 01:22 AM
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Quote:
Originally Posted by dominguez1 View Post
Still traveling, so no ULF calc update yet. Likely in the next few days.

Regarding the scaling...agree with the X axis and Y axis precision that have been mentioned. Definitely 5db for y axis.

Now for smoothing...IMO, it depends what you're trying to do.

I typically use no smoothing to ensure that I'm not hiding any peaks or nulls. Once I've dialed the response in so that I'm confident that those don't exist, I'll eq at the 1/6 scale. Once that is to my liking, I'll then flip to unsmoothed to ensure there are still no peaks or nulls I created in the process. Assuming I'm good there, I'll post my final curve at 1/6 smoothing.

Ultimately (from what I've gathered on this forum),1/6 smoothing is what we hear. If that's the case, then I want my final frequency response graph to show that.

However, if you're posting your response because you want assistance with your FR, or are comparing subwoofers, further precision is beneficial to really help reveal any potential issues. The minimum however for any posting of a response would be 1/6 scaling.

IMO, YMMV
Thanks Dom.. Anyway, I was kind of playing around with moving my subs around this pass weekend and today again. Been board lately so I figured try see what kind of other response I can get just by moving them around.lol..Not the greatest graph now I got nasty dip at 100. Which is my Xover point. But not final yet because my speakers should be done soon and shipped out. That's when I will do my final calibrations. Anyway this is what I got just by moving subs around and auto EQ and some manual cuts with the Antimode dual core. One is unsmoothed and the other 1/6 smoothed. Don't know if this is still enough to boost me in the 5hz cat. But this is fun though. Something to work for lol..

Attachment 136185

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Old 06-26-2014, 04:37 AM
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Originally Posted by rhed View Post
Thanks Dom.. Anyway, I was kind of playing around with moving my subs around this pass weekend and today again. Been board lately so I figured try see what kind of other response I can get just by moving them around.lol..Not the greatest graph now I got nasty dip at 100. Which is my Xover point. But not final yet because my speakers should be done soon and shipped out. That's when I will do my final calibrations. Anyway this is what I got just by moving subs around and auto EQ and some manual cuts with the Antimode dual core. One is unsmoothed and the other 1/6 smoothed. Don't know if this is still enough to boost me in the 5hz cat. But this is fun though. Something to work for lol..

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Your scale of -30 db to 170 dB (200 dB), is giving a very inaccurate view of your frequency response. Try a range of 45-105 to get a more standardized appearing sweep with the proper 5 dB increment.
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Old 06-26-2014, 09:08 AM
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Hypothetically speaking......

If I stacked another four on top of these ie four UXL's to total of eight......would I be able to enter "The Right On Group".......ie. ULF score of 5. I can hit 115 db's down to 8 Hz currently......maybe I can hit 118-120 db's? Maybe?

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Old 06-26-2014, 09:42 AM
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Quote:
Originally Posted by bear123 View Post
Your scale of -30 db to 170 dB (200 dB), is giving a very inaccurate view of your frequency response. Try a range of 45-105 to get a more standardized appearing sweep with the proper 5 dB increment.
Ok.. Thanks.. I'll try that..
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Old 06-26-2014, 09:55 AM
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Here is my response without LT boost


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Old 06-26-2014, 10:00 AM
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Quote:
Originally Posted by rhed View Post
Thanks Dom.. Anyway, I was kind of playing around with moving my subs around this pass weekend and today again. Been board lately so I figured try see what kind of other response I can get just by moving them around.lol..Not the greatest graph now I got nasty dip at 100. Which is my Xover point. But not final yet because my speakers should be done soon and shipped out. That's when I will do my final calibrations. Anyway this is what I got just by moving subs around and auto EQ and some manual cuts with the Antimode dual core. One is unsmoothed and the other 1/6 smoothed. Don't know if this is still enough to boost me in the 5hz cat. But this is fun though. Something to work for lol..
You seem to be down about 40db @ 2Hz vs @ 18Hz. You are right, that is massive null at 100Hz.

Go ahead and fix your scale like bear suggested so we can really see what is going on.

With 4 S2's you should be able to smooth that 100Hz null with proper placement. What are you crossing your mains at?
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Old 06-26-2014, 10:04 AM
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That was the LFE channel only
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Old 06-26-2014, 10:49 AM
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Quote:
Originally Posted by popalock View Post
You seem to be down about 40db @ 2Hz vs @ 18Hz. You are right, that is massive null at 100Hz.

Go ahead and fix your scale like bear suggested so we can really see what is going on.

With 4 S2's you should be able to smooth that 100Hz null with proper placement. What are you crossing your mains at?
Ok thanks.. I'll do it and post it today after work. Btw, how do I adjust the scale? Sorry, still don't know that much on the REW interface. Thanks again guys..
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Old 06-26-2014, 11:43 AM
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Ok thanks.. I'll do it and post it today after work. Btw, how do I adjust the scale? Sorry, still don't know that much on the REW interface. Thanks again guys..
With REW open and a saved sweep open(or a new one up), click on the box in the upper right hand area of the screen that says "limits". Set top to 105 and bottom to 45. Set left to your lowest extension i.e. 5/10, and right to 200.

If you do max output sweeps, adjust BOTH top and bottom levels the same amount to keep the sweeps on the graph, such as 65-125 rather than 45-105. Any 60 dB increment. No smoothing allows you to see all nulls that smoothing sometimes hides, allowing you to make minor tweaks to phase, distance, placement, and even individual sub gain. This can often dramatically lessen a lot of nulls before eq is applied.
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Old 07-06-2014, 03:49 PM - Thread Starter
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Quote:
Originally Posted by rhed View Post
Thanks Dom.. Anyway, I was kind of playing around with moving my subs around this pass weekend and today again. Been board lately so I figured try see what kind of other response I can get just by moving them around.lol..Not the greatest graph now I got nasty dip at 100. Which is my Xover point. But not final yet because my speakers should be done soon and shipped out. That's when I will do my final calibrations. Anyway this is what I got just by moving subs around and auto EQ and some manual cuts with the Antimode dual core. One is unsmoothed and the other 1/6 smoothed. Don't know if this is still enough to boost me in the 5hz cat. But this is fun though. Something to work for lol..

Attachment 136185

Attachment 136193
Rhed,

Too difficult to tell from the chart because of the scale. 5hz is really a question of signal chain if you have enough fire power. It looks like you're down 10db at 5hz from 10hz...
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Old 07-06-2014, 03:51 PM - Thread Starter
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Jbrown15,

Here is your updated ULF score from bassthathz's sim (post 2026) of your system. The 10hz looks more realistic now as its below its sealed counterpart.

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Old 07-06-2014, 03:59 PM - Thread Starter
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Version 14.4 of the ULF Calculator now available (Post 1)
  • Added Mal-X21 Estimate
  • Modified PSA XV15SE estimated output
  • Added Infinity 1260w estimate

Below is the latest member score update, with changes highlighted in yellow.



Keep the scores coming!

-Dom
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Old 07-06-2014, 05:01 PM
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Quote:
Originally Posted by dominguez1 View Post
Rhed,

Too difficult to tell from the chart because of the scale. 5hz is really a question of signal chain if you have enough fire power. It looks like you're down 10db at 5hz from 10hz...
Thanks Dom.. I'll retake measurements when my new speakers arrive. Right now everything's disconnected as far as subs and speakers goes. I'm planning on moving my subs around the room for a better raw response with the new speakers.
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Old 07-06-2014, 10:19 PM
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Quote:
Originally Posted by dominguez1 View Post
Jbrown15,

Here is your updated ULF score from bassthathz's sim (post 2026) of your system. The 10hz looks more realistic now as its below its sealed counterpart.

Heck with this......I'm stacking! Can't let Jbrown15 score higher than me!

Doublewing........double stack.......makes sense.
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Old 07-06-2014, 11:12 PM - Thread Starter
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New member score format:

Separated DIY and Commercial HT systems. (You are DIY if you have any sub that cannot or could not be bought commercially.)

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Old 07-06-2014, 11:52 PM
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Quote:
Originally Posted by dominguez1 View Post
  • Added Mal-X21 Estimate
dom, I've recalculated my score based on the Mal 21's you added in v14.4, here it is:


Can you update my 12.5hz, 16hz, and 20hz scores in the next spreadsheet update?


I'm looking at beefing up some of my subs... but the subs I'm updating roll off like a rock below 30hz so my ULF score won't really change any.
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Old 07-07-2014, 10:34 AM
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So I will have a new score soon, I will update the progress. I wonder if this will equate to a better experience?
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Old 07-07-2014, 10:59 AM
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So I will have a new score soon, I will update the progress. I wonder if this will equate to a better experience?
It will kick it up another three or four quads per channel. Make it more referencier.

A Nice Radio Station with Great Music. For Those That Like That Sort of Thing: RadioParadise.com

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Old 07-07-2014, 11:45 AM
 
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Strong thread is strong. Love the excessive detail in the beginning posts.
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Old 07-07-2014, 06:30 PM
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Josh Ricci tested the SVS SB-13 for audioholics. http://www.audioholics.com/subwoofer...r/measurements
Interesting it didn't get a passing result for 25Hz and below because of THD.

My home theater
Speakers: 3 JTR 212HTR (LCR), 2 Jtr Single 8LP (S), 2 JTR Triple 12LF (SB)) , 4 Volt 10LX (Atmos)
Subwoofers: 10 Sealed UXL-18, 5 Crowson Shadow 8 transducers, 3 Buttkicker LFE
Display: JVC RS400
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Old 07-07-2014, 06:35 PM
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Quote:
Originally Posted by ahmedreda View Post
Josh Ricci tested the SVS SB-13 for audioholics. http://www.audioholics.com/subwoofer...r/measurements
Interesting it didn't get a passing result for 25Hz and below because of THD.
Wow, suddenly the PSA XS15 looks like its excellent value having very similar numbers and less then have the price!
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Old 07-07-2014, 07:46 PM - Thread Starter
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Quote:
Originally Posted by MKtheater View Post
So I will have a new score soon, I will update the progress. I wonder if this will equate to a better experience?
I'm guessing that it will, from a tactile feedback standpoint. Same SPL, but more tactile feedback.

You're on a riser now though, so make sure you do some critical listening on the riser so you can compare setups.

You audio memory is probably accustomed to the concrete floor setup you had for months...
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Old 07-07-2014, 07:54 PM - Thread Starter
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Quote:
Originally Posted by ahmedreda View Post
Josh Ricci tested the SVS SB-13 for audioholics. http://www.audioholics.com/subwoofer...r/measurements
Interesting it didn't get a passing result for 25Hz and below because of THD.
Yes it did:



Here is the estimate we had for it prior to Josh's testing:



Not bad! Within 1.5db!
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Old 07-07-2014, 08:00 PM
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Quote:
Originally Posted by dominguez1 View Post
Yes it did:



Here is the estimate we had for it prior to Josh's testing:



Not bad! Within 1.5db!
My bad.. I misinterpreted his results.. Your estimates were pretty darn close though..

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Speakers: 3 JTR 212HTR (LCR), 2 Jtr Single 8LP (S), 2 JTR Triple 12LF (SB)) , 4 Volt 10LX (Atmos)
Subwoofers: 10 Sealed UXL-18, 5 Crowson Shadow 8 transducers, 3 Buttkicker LFE
Display: JVC RS400
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Old 07-07-2014, 08:13 PM
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Quote:
Originally Posted by dominguez1 View Post
Here is the estimate we had for it prior to Josh's testing:



Not bad! Within 1.5db!
That was pretty darn good great job, Dom. Not that I didn't trust your estimate but now you have it backed up with Josh's result.
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Old 07-07-2014, 08:20 PM - Thread Starter
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Quote:
Originally Posted by tvuong View Post
That was pretty darn good great job, Dom. Not that I didn't trust your estimate but now you have it backed up with Josh's result.
Well, to be fair, I did miss the 10hz output, but still not bad.
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Old 07-07-2014, 10:08 PM
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Quote:
Originally Posted by ahmedreda View Post
Josh Ricci tested the SVS SB-13 for audioholics. http://www.audioholics.com/subwoofer...r/measurements
Interesting it didn't get a passing result for 25Hz and below because of THD.
the sb13 had a passing output down to 10hz. All the green means is amp limited vs orange thd limited.
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Old 07-30-2014, 09:18 AM
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OK, so I ported my IB to see what would happen. I have yet run a movie on it as it was too late last night but after the sims and then running in room responses my response from sealed to ported has not really changed except I have a taller and wider peak from 6-9hz. That's what happens when you tune very low. My score is the following:
5hz: 47


7hz: 23


10hz: 47


12.5 hz: 63


16hz: 63


I am building my enclosures for my surrounds tomorrow and I am either adding 4 f my drivers or two FTW-21's tuned to 7hz. My front wall is tuned to 7hz as well.
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