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ICE amps vs analog amps for bass

I'm currently running Legacy Helix loudspeakers. The bass and subwoofers are being driven by two pair of 500 watt ICE amplifier modules while the Midrange and treble frequencies are being driven by two pair of Levinson 436 amplifiers. While originally auditioning the speakers I heard them with analog amps on the bass, treble, and midrange sections and the sound was superb. However, I was assured that the ICE amps would be sufficient to drive the bass sections so I've given them a try. However the bass sounds funny. I don't hear the impact, definition, and subtle "spatial cues" that I know are in the recordings.
I partially am blaming the ICE modules. I'd sure like some input in solving the problem. I can "upgrade" to "analog" amps for the bass if I choose, but for space reasons and economic reasons, would prefer to continue to use the ICE amps. I'm considering Parasound JC-1s, or Bryston 7bs, for the bass if I switch.
Thanks for your help in advance.
Steve
sgr

Showing 1 response by magfan

magfan
1,583 posts
 
With 98db sensitivity and over a kilowatt per side, I'd say power was not your problem.
Setup? Are these speakers a new-2-you install? Have you tried some room mods? Are they located optimally?
The 'd' amps may simply pass the signal more quickly or slowly than the amps it is paired with. Sound travels about 14" per milisecond, so it won't take much time differrence to 'smear' the image. Phase/timing issues will destroy many of the phase/ spatial q's which you complain about. Likewise, cables should be the near-last thing to worry about.
Sounds like your speakers could also be out of *relative* phase, at least in the sub module.....? hmmmm
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