Big Krells Have Vanished From The Used Market

audiolabyrinth4,242 posts04-28-2017 6:01pmWow!, Ridiculous!, I have a modified krell fpb 700cx,  never runs hot because you have to use a single pole 30 amp breaker!, anyone who has a big krell that runs hot does not know what there doing!, as far as class d amp's,  listened to many,  still do not own one,  and yes, I'm holding on to mine for sound reasons,  my unit sounds a lot better than the stock 700cx 😉

Um... The 30 amp breaker has nothing to do with the operating temperature of the amp. Class A amps run hot because they're single ended, ie: output is always on. So, the heat is the result of the current running through the amp. It wouldn't matter if you had a 100 amp breaker (and hopefully the appropriate guage wire in the wall), the amp will still only use what it's going to draw. I'm assuming you've changed the wire to handle the 30 amp current?

audiolabyrinth, I do agree that having greater supply can have an effect on the sound of the amp in that it can lessen the time required to recharge caps. I rewired demo rooms at a store I worked at years ago in order to accommodate the higher end amps we had and it did make a big difference in how they sounded. However, it doesn't make sense that having a greater electrical supply will lower the operating temperature. The heat is a result of current, therefore, the more current passing through the amp, the more heat created. It's no different than a burner on an electric stove - the more current you allow through, the greater the heat created.