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In Reply to: RE: Good sub for BW CM1? posted by Ric on April 30, 2017 at 07:04:26
Specs don't tell everything, but one spec almost never mentioned in conjunction with subwoofers is THD. It's hard to put into words just how much more musical a super low distortion servo controlled subwoofer sounds when compared with the typical sub. They're not for every installation though, as the servo attaining such low amounts of distortion can easily over extend the drivers excursion limits when used in a HT installation. This issue is easily overcome if your pockets deep enough, just buy multiple subs and REALLY FEEL just how explosive that bomb was supposed to be.
But for the typical home music first system a single servo controlled sub will outperform multiple standard units. I currently have both setups so I speak from experience, I wouldn't trade my servo sub for anything, it's just that good.
Martin
Follow Ups:
Thanks for your input! I remember the reviewer for Audio raving about the first Velodyne sub, which was controlled by motional feedback. Velodyne has now gone to impedance-sensing feedback claiming it's superior, if I am reading the ad copy right. I am not an engineering type.
Hsu's early subs set records for deep extension on a peanuts budget, but I don't know if they use any sort of servo-control.
I agree that harmonic distortion is important and it has always irked me that Stereophile seems to ignore it, probably as a favor to their advertisers. Accepting distortion products as SPL is like accepting confederate dollars!
It's never too late to turn back the clock.
I agree with you regarding servo subs. I recently upgraded from a pair of 12-inch acoustic suspension subs to a pair of 12-inch sealed servo subs and the improvement is amazing. Bass tightness and clarity is so much better than before. Additionally, my servo subs have a rumble filter to prevent pumping with vinyl and over excursion with video.
Best regards,
John Elison
What are some "sealed servo subs"?
Are Velodyne and Rythmik examples?
Thanks!
It's never too late to turn back the clock.
My Rythmik Servo Subs have sealed enclosures. Rythmik makes both sealed and ported subwoofers.
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