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"Sander deWaal" wrote in message
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" said:

Krell 350 Watt monoblocks @ $17,500.00 per pair
350 watts wpc @ 8 Ohms
700 wpc @4 Ohms
1400 wpc @ 2 Ohms
Signal to noise = 118db 95 db @ 2.83 V
THD = .05% 20 Hz - 20 kHz
Input Impedance = 100 K Ohms
Input Sensitivity = 2.6v RMS for max power
Voltage gain = 26.4 db

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QSC PLX 3402 Stereo amp $1200.00
700 wpc @ 8 Ohms
1100 wpc @ 4 ohms
1700 wpc @ 2 ohms
Signal to noise 107 db
THD = .03% 20 Hz - 20 kHz
Input Impedance = 6 K ohms
Input sensitivity = 1.9 Volts @ 8 ohms
Voltage gain = 32 db


One of the things that I noticed immediately is the ability of the
Krell to deliver twice the power (meaning current) in half the load,
up to 2 ohms.
I suspect that even in 1 ohm the figure would be close to the required
2800W, be it for a brief period of time.
The QSC has only marginally more power into 2 ohms (not that those
insanely high wattages have any meaningful use, you will note).
Also, the current doesn't double with half the load.
This means the Krell has a stiffer power supply, despite the lower
average wattage. It is a true constant voltage source.

You've jumped to a conclusion that's not borne out by the figures. The
power output into a variety of load impedances is simply part of the spec.
It does not mean that the power output of the Krell will double just by
changing the load from 8 to 4 ohms. In other words, it has nothing to do
with the "stiffness" of the power supply.

What it DOES mean, on the other hand, is that the Krell is a 1400W
amplifier designed for optimum performance into a load of 2 ohms or less.
Since the output is voltage limited, it's an inefficient amplifier choice
for an 8 ohm speaker.

**All well and good Norm, but when was the last time you measured a
perfectly resistive loudspeaker load?


--
Trevor Wilson
www.rageaudio.com.au