2. amps-preamps
  3. 1137482455

Sound tripping at "not loud enough" volumes

Hi,

I need more volume...and I know that the amps and speakers can do it...but....

I am using audiolab 8000P series stereo amps, being bi-wired, and bi-amped from a 8000C audiolab prepamp and a sony CD transport.

These are driving NHT 2.3 speakers. with (quite old now) midnight blue cables.

My problem, is that when I get the amps up to around 7 oclock, the mid/treble amp trips and all I am left with is the bass amp working. After turning the mid/treb amp down a bit, and waiting about 3-4 seconds, the amp comes back in again.

I have tried switching the power amps, but it is always whichever amp that is serving the mid/treble range that trips....so presumably not the power amps.

Any clues guys, as even although 6 oclock is quite loud...I REALLY NEED to get the dial up there some times and shake the roof off!

Cheers
caitchison94db
timrhu
2,779 posts
 
When you say "7 o'clock" do you mean one o'clock or are all your clocks upside down?
beavis
272 posts
 
I second Bignerd100's analysis. Think your speakers are presenting an abnormally low load (like 1-2 ohms) to amplifier in mid/treble. The amp then runs out of gas & shuts itsef down to avoid "hard" clipping or the speakers have a protection circuit which shuts your speakers down until voice coils can cool off sufficiently to continue.

Speaker mfrs., in general, specify only a nominal ohm load rating, ignoring the minmum load rating which is what the amp sees.

If running multiple sets of speakers at same time, run only one set and/or buy a speaker selector that won't pass an extremely low load like 4 ohms minimum, which most modern amps are capable of.
whoaru99
98 posts
 
It could also be that the nature of the mid/high section load has a component of inductive and/or capacitive reactance that is not to the liking of your amplifer and causing it to go into the protection mode.
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