)
that is +-74 volts rails, assume rails are +-70 af full tilt, the ac output is 46 volts ac rms, and that is 260 watts into 8 ohms, so yes, 375 watts into 4 ohms is possible....
in the ideal world, power output is doubled when speaker load is halved...but the big IF is that your psu is able to maintain the rail voltages..real world psu's do not do that when using the conventional magnetic traffos and such..
oh, and there is the question of SOA, two pairs does not seem to be encouraging....but if just playing music, then maybe you can get away with it...
Specs: http://heuff.nl/openbaar/4 LEM/Manuals/procon_plus_eng.pdf
Low-Pro power amp with fan.
375W on four devices is either very brave or very cheap. There is a hint on the sales-sheet: "...something that you’ll love to hear: you will get all that at the same unbelievable price level as the previous procon amplifiers!"
"unbelievable"??
NPN data: https://toshiba.semicon-storage.com/info/docget.jsp?did=20668&prodName=2SC5200
At a hasty glance: I accept that it can do 375W for a minute with a 4 Ohm resistor load. It may even drive 8 Ohm speakers without early trouble. I would not be surprised if stage-work with odd-Ohm loads at HIGH levels burned it up.
You are "aiming"? The general trend in pro amps, even low-pro, is MORE power devices. Reduces heatsinking trouble. Reduces Warranty Returns. IMHO it is foolish to try for a "minimum" number of output devices. What you don't put in now, you will put in for repairs; plus blown transformers and burned speakers. IMHO 75W/pair is tops, and 50W even 40W/pair is much safer. These days 8 or 10 pair of big transistors is not real expensive.
Low-Pro power amp with fan.
375W on four devices is either very brave or very cheap. There is a hint on the sales-sheet: "...something that you’ll love to hear: you will get all that at the same unbelievable price level as the previous procon amplifiers!"
"unbelievable"??
NPN data: https://toshiba.semicon-storage.com/info/docget.jsp?did=20668&prodName=2SC5200
At a hasty glance: I accept that it can do 375W for a minute with a 4 Ohm resistor load. It may even drive 8 Ohm speakers without early trouble. I would not be surprised if stage-work with odd-Ohm loads at HIGH levels burned it up.
You are "aiming"? The general trend in pro amps, even low-pro, is MORE power devices. Reduces heatsinking trouble. Reduces Warranty Returns. IMHO it is foolish to try for a "minimum" number of output devices. What you don't put in now, you will put in for repairs; plus blown transformers and burned speakers. IMHO 75W/pair is tops, and 50W even 40W/pair is much safer. These days 8 or 10 pair of big transistors is not real expensive.
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