Originally Posted by jbrown15
So by that theory a Rythmik sub would sound better then a Seaton Submersive because of the Direct-Servo? I think you'd have a had time of convincing anyone of that. You've done a blind comparison of a XS30 and F15HP and can honestly say the F15HP sounds better? Sorry dstew100 I know you know your subs but unless this is the case you are simply giving a theory and opinion.
Ease up there, no putting words in my mouth
The Submersive is not only a work of art but sounds fantastic, has massive output capabilities, digs very deep, and I think it's very reasonably priced for what it is. We'll have to wait and see if the forthcoming Rythmik F25 is in the Seaton league; glad that pressure isn't on my shoulders.
I would be very interested in seeing tests like that. Honestly though, at the GTG in a very informal with us drinking atmosphere I could not audibly say "that's a servo, that's not". There have been some third part tests on just a Rythmik, servo and non servo and the measurements show lower distortion, and they said in theory the differences were enough to be audible. The other thing that has been done is measure the feedback coming off the servo unit, it is measurably decreasing distortion. The greater cone control at high levels I don't think is in question, but potentially I could be eat my words on that. Although I'd still put this in the opinion category, I'm pretty confident on greater cone control providing an audible difference.
Such a comparison is hard. The test would have to be a servo'd submersive vs a non-servo'd submersive, not what you are suggesting. I wonder what Mark's opinion is on the matter but I suspect he doesn't think it adds enough since he doesn't do it.
Another very subjective opinion I have on the Rythmik is Brian is an Electrical Engineer and makes a valid point about how historically amp people are not driver people and vice versa. He makes critical design decisions well and is looking out for the value oriented offerings for customers (see 550watt amp saving 100bux giving up .5db SPL). Based on his love for music, how he takes care of his customers, contributes so much technical information, is all about high value, I do not believe he would be building servo subs as a marketing gimmik. As an engineer, I'm not a fan of those marketing / sales people, never met an engineer that was, my Dad's an EE, and I've worked with other engineers for 13 years. I just don't see it. I know it measures better, but if it didn't perform better, I'm of the opinion he wouldn't be building servo subs. Obviosuly everyone gets to make up their own mind on such an angle.
A question mark I have in my head is why does the XS30 need two 15's to get where the FV15HP is in terms of output (assuming we can agree they are pretty close, which I think the measurements say they are)? Is that just driver differences or is the servo allowing the Rythmik to push harder without distorting? Clearly the XS30 has box size advantage (but the Rythmik is ported). I'm not sure on any of these answers but something I think about.
I'm not taking anything away from PSA, I own one and it is sweet. But I do really enjoy my Rythmiks. So So So clean.
I've learned a lot on the subs the last couple years, but there's many a man around here that's far beyond my understanding. And if I'm wrong, not afraid to stand up and say it; love learning something new.