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In Reply to: RE: Need help understanding what went wrong - biamping with 2 different amps. posted by carcass93 on January 12, 2015 at 12:49:38
With a crossover of 225hz, you need MORE power ABOVE then BELOW if you intend to run out of gas about the SAME time.
Also, unless you are using a LINE LEVEL crossover, you are NOT gaining any power. BOTH amps are STILL required to reproduce a full bandwidth signal.
A line level crossover, either of the Passive or Active type will net you as much as 3db additional power.
Your example with nearly 8db of output difference between the 2 amps AND the crossover near the theoretical 50:50 point of 350hz, means the tube amp SHOULD run to cllipping first. Way First.
I LIKE the idea of disconnecting AC before doing cable swaps. Real workmanlike.
You MIGHT have, as someone suggested, simply run the fuse near death. A 25 watt amp trying to keep up with that Parasound is a losing proposition and I'm sure you ran the tube amp near redline much longer than you suspect. With nearly ZERO headroom.
Too much is never enough
Follow Ups:
The only things in common are make/model of the speakers (well, more or less - mine are newer iteration), and the fact that SS amp is on bass, and tube - on mids/highs.Also, the fuse blew up in SS amp, and I'm pretty sure it was coincidental with turning the tube amp off.
PS: Why it actually works:
Although, as you said, in the absence of a line-level X-over the amp still sees the full-range signal, it's not tasked with actually reproducing all of it - into impedance it's not comfortable with. If you look at the impedance curve of the speakers at the link in my OP, you will see that an amp must work much harder, to reproduce bass.
As long as you don't approach clipping with tube amp driving mids/highs - it should work, and I can confirm that it does. There's no distortion audible at very high volume, unlike the tube amp driving speakers full-range.
Edits: 01/13/15 01/13/15
Because the toobs clip most audibly in the Bass, the top and mid will just get dull and soft until you hit 20% thd, the SS does the opposite , exercising it's distress in the mid/high frequency. Very unlikely you are not clipping that 25watt/channel amp , even if you are enjoying it, use a 100 watt/ch one and see.As to original question:
When you powered down your tooby amp, you may have caused your SS amp to oscillate, popping the fuse, hence no pop from woofer that you noticed ..
Regards...
Edits: 01/13/15 01/13/15
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