Extraordinary claims made about Rythmik Subwoofer !!

[seanzozo]

Originally posted by snoopy


Then look at its components. A good servo should reduce distortion by at least one order of magnitude !! This is not even happening at 40 Hz which is way above the amplifier limit and displacement limit for the driver. This means the servo is really doing nothing and the claims about distortion reduction on the website are not justified !!!

It is clear you do not know what you are talking about, and do not wish to learn. You wish only to troll about a product you have never tested or touched. You respond to only the posts you think you can counter and move from bogus talking point to bogus talking point.

I am--provided you do not misrepresent my comments--done with this conversation after this post

How can you tell that the servo is not reducing distortion--nothing in this graph compares servo to non servo operation. You DO NOT understand this graph. You do not understand any of the distortion graphs posted by IKKA.

It is clear the servo results in extended bass response (use of the t/s parameters demonstrates this clearly - refer to earlier post by me)

It is clear the servo sub results in lower distortion than many expensive 12 inch drivers in sealed cabinets (in fact at 20hz it out performs all sealed 12's on the HTShack site -- when you actually compare REAL output levels)

I have yet to hear an owner complain about the sub.

Done-

Sean

[deandob]

Originally posted by otto88
the winter in Melbourne is not as bad as at latitudes of say 45 degrees, but I find it somewhat a downer
(disclaimer: an ex Sydney person)

On topic . .

> the only subwoofer I have tried that can integrate reasonably seamlessly with my mains (Dunlavy IV-A's, no slouches) and do double duty for a good HT rumble

which Rythmiks are you using?

Cheers

I am using the DS12CV (compact 12" kit) x 2. I wanted a smaller subwoofer which had reasonable SPL levels for a dedicated media room with an emphasis on SQ. I am happy with its performance as it meets my needs, and know that other subwoofers I had auditioned (albeit not a wide range) were not up to the task. I also have a friend who built the 15" servo kit, and he gets better SPL from it, and he has a bigger room.

If I was to pick a fault I would say that the amplifier is a little weaker than it should be, as it does go into shutdown occassionally on very LF heavy movies, and I don't hear any driver distress when that happens.

The point made above about the rythmik's doing a reasonable job with distortion above 50Hz (and it not mattering as much below that) is probably why it makes a good companion for a good audio system. Although my mains do an excellent job with music reproduction, the Rythmik adds weight / presence to the sound that IMO makes the music more enjoyable and strangely seems to tighten the imaging. When listening I can't tell that the sub is on, and if I switch it off the music goes flat. (mostly because it helps to fix a bass null in the room that I can't fix with just the mains alone).

All the above is subjective of course.

I'm a happy Rythmik customer and would recommend this product to others.

Regards,
Dean

[Cataclysm]

I have a DS1500 sub.

I have zero complaints about it.


Rythmik offered prompt shipping, great customer service, quality components, and a package which delivers all that I was lead to expect, in spades.

[snoopy]

Instead of throwing red herrings into the debate all of the time here is the point I'm trying to make for the 100th time

The manufacturer of the Rythmik subwoofer makes the following claim:-

Direct Servo technology: why do we need it?
Conventional subwoofers have extremely high distortion. Well regarded conventional subwoofers typically have measured distortion levels exceeding 15% at 20 Hz at 100 dB. This includes many subwoofers costing more than US $3000. We think this is far too high. A well designed servo subwoofer will achieve distortion levels under 3% under the same conditions.

DOES THE RYTHMIK SUBWOOFER MEET THE CLAIMS OF A "WELL DESIGNED SUBWOOFER" ??

YES or NO ??

If you don't know the answer to this question then why are you arguing ??

[seanzozo]

Originally posted by snoopy
Instead of throwing red herrings into the debate all of the time here is the point I'm trying to make for the 100th time

The manufacturer of the Rythmik subwoofer makes the following claim:-



DOES THE RYTHMIK SUBWOOFER MEET THE CLAIMS OF A "WELL DESIGNED SUBWOOFER" ??

YES or NO ??

If you don't know the answer to this question then why are you arguing ??

YES (load it 1/8th space and measure from 1m)

I lied about being done...but i was right about you not responding to any argument cant handle

If porsche advertised that a proper race-car with their awd system should go 200mph...I wouldn't suddenly think the carrera4 was crap because it couldn't.

Sean

[snoopy]

Originally posted by seanzozo


YES (load it 1/8th space and measure from 1m)

I lied about being done...but i was right about you not responding to any argument cant handle

If porsche advertised that a proper race-car with their awd system should go 200mph...I wouldn't suddenly think the carrera4 was crap because it couldn't.

Sean

Your arguments are fallacious and are not worthy of comment. Just stick to the issue and please provide the evidence. Your opinion about the capability of something is not construed as evidence.

[seanzozo]

Originally posted by snoopy


Your arguments are fallacious and are not worthy of comment. Just stick to the issue and please provide the evidence. Your opinion about the capability of something is not construed as evidence.

Every time you have made some bogus claim -
-like suggesting the velodyne 12" measured better, OR
-like suggesting there were worlds of difference between an 18 inch servosub and the Rythmik and thus the Rythmik servo couldn't be effective OR
-that a graph which displayed only harmonic content from H@ down could tell you whether a servo was reducing distortion
I have "provide[d] the evidence."

If my argument includes numbers, claculations, comparisons or evidence - you don't comment -> they must be "not worthy of comment"

Rather, when it is demonstrated that you don't get it, you retreat to your straw man argument best summarized as follows: "look a this single claim on a large website that doesn't reference any particular product which isn't met by the smallest, lowest output, cheapest product on the site (but could clearly be met by the 15 inch vented Rythmik) - that must mean all rythmik products are junk and the designer a hack...."

It is a dumb line of argument.

If you don't like the advertising -> don't buy the product
But what you have done, numerous times on this thread is misrepresent the actual measured performance of these drivers with uneducated comparisons

Sean

[snoopy]

Originally posted by seanzozo

If you don't like the advertising -> don't buy the product
But what you have done, numerous times on this thread is misrepresent the actual measured performance of these drivers with uneducated comparisons

Sean

Once again I'll be more specific this time.

DOES THE RYTHMIK SUBWOOFER MEET THE MANUFACTURERS CLAIMS OF A "WELL DESIGNED SUBWOOFER" ACCORDING TO THE MANUFACTURERS CRITERIA OF REPRODUCING 20 Hz @100 dB @ LESS THAN 3% THD ??

If the answer to this question is YES then please provide the objective evidence needed to back up this claim !!

[seanzozo]

LOOK I CAN BE A NINNY USING UNDERLiNE BOLD CAPS WITH EXCLAMATION POINTS!!!!!!!!!!

What is THE RYTHMIK SUBWOOFER? a sealed 12 (at what cubic feet); the vented 12 they used to make; a sealed 15; a vented 15; vented 15 in a sonotube transmission line?

Besides not making clear which sub you refer to, the text of your question is not a verifiable premise, it is marketing hyperbole. At what distance and into what loading (full-space, half space, eighth space etc.). At some distance and into some loading any of the rythmik subs will hit 100db at 3%.

How about this...We split the cost of a 15 inch rythmik vented kit...If it hits 100db at 3% distortion or less at 1m into half space in a cabinet I design...I get to keep it...If not you get to keep it. (I'm betting I get to keep it)

Sean

I'd like to also comment that the "Claim" you keep chirping about also suggests in the preceding sentence that many well regarded subs have 15% distortion at 100db - very few of the sealed subs on the HTSHACK tests hit 100db ACTUAL output at sub 20% suggesting that the quote is referencing vented subs or an alternate measuring situation - loading or distance such that none of the data you have presented would disprove the claim. That kind of logic might be beyond you.

As examples the CSS 2x15 hits 98db at 20hz at 28% the tc sounds 2x15 hits 101db at 23% ----> these point strongly to the suggestion that the RythmiK manufacturer was either referring to vented alignments or a different loading/distance

[snoopy]

Originally posted by seanzozo
LOOK I CAN BE A NINNY USING UNDERLiNE BOLD CAPS WITH EXCLAMATION POINTS!!!!!!!!!!

As examples the CSS 2x15 hits 98db at 20hz at 28% the tc sounds 2x15 hits 101db at 23% ----> these point strongly to the suggestion that the RythmiK manufacturer was either referring to vented alignments or a different loading/distance

I'm not interested in your rationalizations. Answer the question. Yes or No ??

If your answer is Yes then please provide the evidence and the conditions in which the tests were made !!

Surely you are not that simple that you can't understand a simple question