Official Rythmik Audio Subwoofer thread - Page 667 - AVS Forum | Home Theater Discussions And Reviews
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post #19981 of 19992 Old Yesterday, 07:14 PM
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If anyone is interested I just listed my (2) F25's for a very very discounted price. Have to sell off my HT room completely due to moving. Loved these subs immensely while I had them.
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post #19982 of 19992 Old Yesterday, 07:28 PM
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^^ that is crazy great deal. Where are you?
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post #19983 of 19992 Old Yesterday, 07:58 PM
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Originally Posted by tvuong View Post
^^ that is crazy great deal. Where are you?
NW Ohio
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post #19984 of 19992 Old Yesterday, 08:38 PM
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Originally Posted by jd10ac View Post
Is there anyway to find some output numbers on the L22? I also want to verify that at 20hz it is 2db above the highly regarded lv12. I am thinking of replacing my sealed 15" sub with the l22 and was hoping it would have similar output.
You mean besides the ones on the Rythmik site? http://www.rythmikaudio.com/products1.html Brian is pretty exacting, and exact, so I would trust his numbers. He's another anal design engineer...

Since this keeps coming up lately, here is the table from the Rythmik site:

Output comparison

At 20 Hz, our subs vary in their maximum output capability. The output at 20 Hz is shown relative to F12.

F12: 0db (baseline)
F8: -1.5db
L12: -1db
LV12R: +2.5db
E15HP: + 3.5db
L22: + 4db
F15HP: +4db
FVX15: +6.5db
FV15HP: +9.5db
F25: +8db

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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post #19985 of 19992 Old Yesterday, 08:45 PM
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Quote:
Originally Posted by DonH50 View Post
You mean besides the ones on the Rythmik site? http://www.rythmikaudio.com/products1.html Brian is pretty exacting, and exact, so I would trust his numbers. He's another anal design engineer...

Since this keeps coming up lately, here is the table from the Rythmik site:

Output comparison

At 20 Hz, our subs vary in their maximum output capability. The output at 20 Hz is shown relative to F12.

F12: 0db (baseline)
F8: -1.5db
L12: -1db
LV12R: +2.5db
E15HP: + 3.5db
L22: + 4db
F15HP: +4db
FVX15: +6.5db
FV15HP: +9.5db
F25: +8db
I have seen those numbers but I am looking for something more like cea numbers that are easier for a novice like me to kind of make sense of.
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post #19986 of 19992 Old Yesterday, 09:01 PM
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Isn't CEA for car amplifiers? Subs are typically measured for output SPL... I am not very familiar with CEA specs so I must not understand.

* Look here: http://www.audioholics.com/subwoofer...p-measurements

That is for the FV15HP; you can subtract 5.5 dB'ish for the L22. Or, for the L22, at 1 m:

111.0 dB at 20 Hz
116.5 dB at 25 Hz
121.3 dB at 32 Hz
123.5 dB at 40 Hz and above (more or less)

HTH - Don

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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post #19987 of 19992 Old Today, 02:14 AM
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Quote:
Originally Posted by BigCoolJesus View Post
If anyone is interested I just listed my (2) F25's for a very very discounted price. Have to sell off my HT room completely due to moving. Loved these subs immensely while I had them.

Wow that is a great deal, I'm tempted.
Shipping abroad would go?
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post #19988 of 19992 Old Today, 05:04 AM
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Quote:
Originally Posted by DonH50 View Post
Isn't CEA for car amplifiers? Subs are typically measured for output SPL... I am not very familiar with CEA specs so I must not understand.

* Look here: http://www.audioholics.com/subwoofer...p-measurements

That is for the FV15HP; you can subtract 5.5 dB'ish for the L22. Or, for the L22, at 1 m:

111.0 dB at 20 Hz
116.5 dB at 25 Hz
121.3 dB at 32 Hz
123.5 dB at 40 Hz and above (more or less)

HTH - Don
He is talking about CEA 2010 test numbers I think. Most modern DIY sub makers have at least one model with these results publish, and Databass has a ton.
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post #19989 of 19992 Old Today, 05:19 AM
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Thanks, figured that out, and the link and numbers I provided are from CEA-2010 test results. I have not kept up with all the standards since letting my IHF CAC lapse...

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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post #19990 of 19992 Old Today, 06:27 AM
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Quote:
Originally Posted by jd10ac View Post
Is there anyway to find some output numbers on the L22? I also want to verify that at 20hz it is 2db above the highly regarded lv12. I am thinking of replacing my sealed 15" sub with the l22 and was hoping it would have similar output.
I believe you have XS30 which has two 15" drivers. Output from L22 is similar to that F15HP/E15HP, the 15" high power model.

Regarding CEA numbers, I think the most important max output data is 20hz which is the number we provide as reference. This is because 20hz is the number in practice determines the max "volume" you can set on your AVR. Once the SPL at 20hz exceed the max output, the limiter is going to kick in and that bring downs the entire frequency band subwoofer plays. 20hz is not really audible. So it needs to a lot of signal strength and that combined. At the same time, subwoofer is normally least efficient at the bottom end of FR. These two factors make the 20hz output more important.

In terms of Data-bass subwoofer testing, we feel the limitation of the test method penalize the subs that extends low and that makes the measurement looks bad. For instance, if a sealed sub is down 10db at 20hz (vs another sealed sub down only 3db at 20hz), the former is going to have better distortion number at 20hz becasue it is down at least 7db more than the other model. That is why I keep joking the best bass is no bass even from measurement point of view. The same is true for impulse response and waterfall plot.

Last edited by Rythmik; Today at 06:33 AM.
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post #19991 of 19992 Old Today, 09:18 AM
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Quote:
Originally Posted by Rythmik View Post
I believe you have XS30 which has two 15" drivers. Output from L22 is similar to that F15HP/E15HP, the 15" high power model.

Regarding CEA numbers, I think the most important max output data is 20hz which is the number we provide as reference. This is because 20hz is the number in practice determines the max "volume" you can set on your AVR. Once the SPL at 20hz exceed the max output, the limiter is going to kick in and that bring downs the entire frequency band subwoofer plays. 20hz is not really audible. So it needs to a lot of signal strength and that combined. At the same time, subwoofer is normally least efficient at the bottom end of FR. These two factors make the 20hz output more important.

In terms of Data-bass subwoofer testing, we feel the limitation of the test method penalize the subs that extends low and that makes the measurement looks bad. For instance, if a sealed sub is down 10db at 20hz (vs another sealed sub down only 3db at 20hz), the former is going to have better distortion number at 20hz becasue it is down at least 7db more than the other model. That is why I keep joking the best bass is no bass even from measurement point of view. The same is true for impulse response and waterfall plot.
Thanks for the reply, I do currently have an xs30se but was wanting to compare the L22 to the much smaller s1500 I previously had. Given the size and shape of my room I should probably be looking at the fvx15 but the much smaller footprint of the L22 has me intrigued for waf.
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post #19992 of 19992 Unread Today, 11:20 PM
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So I finally got around to reading this and thought it was brilliant. All along I've been thinking that the damping control increases the effort of the servo to tame ringing, when actually the opposite is true: mid and low damping tells the system to add ringing electronically because the intrinsic Q of Rythmik sealed subs is only 0.3. It's all the more impressive to think that Brian is building 0.3 Q subs and is adding ringing to simulate what many other subs on the market do by their nature: ring.

Samsung PN64H5000 (recommended settings)
Denon AVR-X4000

And a little R&R:
Reaction Audio CX-10 (2)
Rythmik Audio F12 (2)

Last edited by Soulburner; Today at 11:24 PM.
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f12g subwoofer , Rythmik , Rythmik Audio , Rythmik Audio F12 Direct Servo Subwoofer , Rythmik Audio F15 Subwoofer , servo sub

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