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Role of sub woofers?

I had begun thinking about changing out the KEF Reference 1s for floor standers, something like Wilson Sophias, Revel Ultima Studios, or the expensive KEF Reference 207/2s. Then I reset the crossover for a pair of Velodyne HGS-15s from 40 Hz to 80 Hz, and the sound stage size, sound stage depth, and sound stage detail improved so strikingly thoughts of changing anything vanished. I did redo the speaker setup extensively, including redoing all the SMS-1 bass manager connections, so I suspect the vast improvement was due to more than just adding 40 Hz to the range covered by the the subs — I must have fixed some previously unknown problem. Anyway, a setup that I thought was best for jazz and baroque now does large orchestrations convincingly with a sense of spaciousness I had previously imagined only floor standers could deliver. One detail I’ve noticed is that the power-on LEDs of the subs that were previously rarely activated are now usually lighted, suggesting the subs are playing a much more active role.

Well about not changing anything: I have a third HGS-15 I might install on the wall opposite the setup for a three sub distribution.

db
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dbphd OP
1,616 posts
 
I have both SMS-1 manuals, several sweep tone CDs, calibrated microphone with stand, and a monitor for displaying the various videos generated by the SMS-1.  I prefer the Outlaw manual.  I actually have three SMS-1s, but use only one.  An Ayre KX-5 Twenty preamp connects to the input of the SMS-1.  I've tried a couple of high-pass crossovers between the KX-5 and VX-5 amp even though Charles Hansen discouraged it, but it turned out he was right; the sense of openness was compromised.

db


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dbphd OP
1,616 posts
 
Thanks, mijostyn & m-db, for the enlightening posts. Last night I played several Blu-rays, with balanced analog from the Ayre DX-5 DSD to the KX-5 Twenty preamp. I thought the sound quality superb, so I’m unlikely to mess with the setup in the near future.

Charles Hansen contended that nothing should be inserted between the Ayre preamp and amp, because of their fully-balanced zero-feedback design. Nevertheless I tired an elaborate Bryston high-pass and a balanced passive custom. I ended up conceding his point.

db
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