TIP: Click on subject to list as thread! ANSI
echo: pro_audio
to: TERRY SMITH
from: LASZLO SOKOLAI
date: 1995-12-16 14:23:00
subject: Re: big, big, big sound!

TS > LS> much), and my 2400 watt amp, well, it puts out a max
TS > LS> of 2925 watts plugged into a worst case wall plug.  Both amps are
TS > I would estimate that your 2400 W amp can only sustain 1500
TS > W in a worst case wall plug.  If you can prove otherwise,
TS > let's talk about designing a perpetual motion machine
TS > without hidden photocells.
That's what the FTC claims in these specs.  But that differed when i upgraded 
the toroid and the capacitors FROM it's 6800mfd.  PLus i had to up the bridge 
rectifiers from 30 amperes to 60 amperes because the thermocouple kept 
killing the power because the rectifiers were the hotspots in the amplifier.
TS > LS> another 1500 watt power supply.  I have another 2400
TS > LS> watt amplifier like the one above, but i modified the
TS > LS> power supply, and i measured it can hold 4,000 watts
TS > LS> total power, RMS, but i needed a 35 ampere breaker
TS > 4,000 Watts is a rate of energy transfer, not an amount of
TS > energy.
Well everytime i tried to make this amp huskier on it's wattage, what you 
said above is pure BS.
TS > Do the units Joule or Watt-second mean anything to you?
Yes, and capacitance played a MAJOR role in CONTINUOUS SUSTAINED 100 percent 
duty power output.  I thought the caps would drop their storage in continuous 
current demands from the amp, but it kept the continuous output power.  Burst 
energy was measured MUCH higher, at 12,000 watts total output power.  In 
bridged mode, this amp is pure lethal because it supplies 100 amperes with a 
50 percent reduction in damping factor at 167 volts.  I can ARC weld with 
this amp in bridged mode without clipping and a bit of heat off the heatsinks 
in the amp.
TS > Do you know what the ESR of the filter capacitors in that
TS > amp is, and what their capacity and no/full load rail
TS > voltages are?
Yes, explained below.  This amp uses dual complementary rails instead of 
trying to compare it to some cheapo single complementary rail amplifier like 
you are trying to do.
TS > If you're interested in working with such electronics, and
TS > don't wish to be seen as an all too common BS artist, you
TS > might study some basic physics and electronics to
TS > understand fundamental concepts and units.
Go back to your books buddy.
The ESR of the caps is 6800mfd per rail.  It uses a +145v, +78v, 0v -78v, and 
-145v rails out of the power supply to the rails.  6800mfd per rail is the 
capacitance in the amplifier, which is not much.  The rails were built this 
way in the amplifier to prevent harsh clipping on the output rails and 
causing the back EMF from the speaker from interefereing with the damping at 
high levels of power.  A wall plug supplies 1875 watts at 125 volts AC.  The 
wall plugs in my room are 118.7 VAC.  The amplifier can sustain a continuous 
100HZ tone burst at 3,300 watts in the worst case wall plug.  In a solid wall 
plug like in the basement at the breaker panel, it can sustain exactly what 
the manufacturer said it would - 3,400 watts.  And yes the amp now NEEDS a 35 
ampere breaker from the main distribution panel to sustain it's 4,000 watt 
sustained 80 percent duty peaks.  Energy transfer is 75 percent efficient in 
the most worst case (plugged into a 18 or 16 guage line cord).  This is what 
i measured out of the amplifier, total, each channel sustained at 2.67 ohm 
loads (3 8 ohm speakers in parallel) with a bit of reactivity and back EMF 
from the speakers.
Laszlo Sokolai
Team ANTI-Windows95/PRO-OS2/PRO-Unix
lsokolai@bbs42.com
--- BBS 42
---------------
* Origin: BBS 42 Node 3 7.5 gigs (1:221/605)

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