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In Reply to: RE: Mixed Bi-Amplified Transistor and Valve system posted by FlyGuy on March 30, 2015 at 07:41:01
I've had decent but not outstanding results bi-amping and that was with very similarly spec'd amps. The extra equipment, cables, matching levels, and tweaking cross-overs wasn't worth the hassle for me.In the end I found it much easier to use a single larger amp of higher quality which produced noticeably better results.
In your setup the mismatched amps have wildly different specs for power and input sensitivity so you're starting off with an even bigger disadvantage to work through.
Just my 2-cents worth of course.
P.S. - I have similar feelings about subwoofers. They can help but they're a royal pain to 'get right' in a particular room to integrate seamlessly with the other gear. Bigger amp & bigger speaker is my preferred route vs a subwoofer.
Edits: 03/30/15Follow Ups:
***In your setup the amps have wildly different specs for power and input sensitivity
People often get confused - you don't need the same input sensitivity, you need the same GAIN. Different power ratings are OK as long as the gain is the same.
Thanks Victor, for putting Abe straight.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Good on you Timbo!
...people asked about input sensitivity, I would be able to buy a decent suit.
Last time was yesterday.
This forum is not just for Abe.
Ah OK, I double checked the input sensitivity vs power output into 8 Ohms on each of his two amps. They do in fact calculate out to approximately the same GAIN of 30dB. 1/3dB difference actually. Not much.Amp #1:
100-Watts into 8 Ohms =
3.536 Amperes and 28.28 Volts
900mV drive for full output
= 29.95dB GAINAmp #2:
300-Watts into 8 Ohms =
6.124 Amperes and 48.99 Volts
1500mV drive for full output
= 30.28dB GAIN
Edits: 03/30/15
If you have two different amps with different gains would volume changes become a problem as well???
I believe the volume changes will be proportional.
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