The noise was distortion from the amp's built in caps running out of power - on the sub amp. On the other amp, it wasn't getting a nice clean 12+ volts anymore because the sub amp was eating too much of the power.
I'll agree that modern day competition grade amps should never run out of power as long as they are run within their specs.
However, I'm running old school amps at very low resistances, and using external actively cooled heatsinks and the cap to keep them stable. I've grenaded a LOT of stereo equipment learning exactly how much you can 'push' beyond the factory specs. Not such a big deal when you are working in a stereo shop, so factory returns aren't difficult. I've done everything from loosing the magic smoke in many components all the way to heating up an amp to the point that the solder on the mainboard inside melted and all the components fell off, making a heavy duty baby rattle out of a $2000 amp.
Unfortunately (well, kindof) I don't work in a stereo shop anymore, and haven't for many years now. On the other side of the coin, I make enough money in the computer software industry now that I can afford to pay regular retail for anything I really care to own. Furthermore, since I passed the age of 30, I rarely push the system hard enough to roast anything anymore.
I'll agree that modern day competition grade amps should never run out of power as long as they are run within their specs.
However, I'm running old school amps at very low resistances, and using external actively cooled heatsinks and the cap to keep them stable. I've grenaded a LOT of stereo equipment learning exactly how much you can 'push' beyond the factory specs. Not such a big deal when you are working in a stereo shop, so factory returns aren't difficult. I've done everything from loosing the magic smoke in many components all the way to heating up an amp to the point that the solder on the mainboard inside melted and all the components fell off, making a heavy duty baby rattle out of a $2000 amp.
Unfortunately (well, kindof) I don't work in a stereo shop anymore, and haven't for many years now. On the other side of the coin, I make enough money in the computer software industry now that I can afford to pay regular retail for anything I really care to own. Furthermore, since I passed the age of 30, I rarely push the system hard enough to roast anything anymore.