USB DONE RIGHT: Two magic boxes that let computer audio ...
USB DONE RIGHT: Two magic boxes that let computer audio ...
USB DONE RIGHT: Two magic boxes that let computer audio ...
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about 147 ohms. I was expecting roughly<br />
0.00 ohms. I checked the 4070 manual<br />
and it refers to these plugs as “dummy<br />
loads” rather than shorting plugs. Both<br />
my ears and my VdH amp seem quite<br />
happy with the 147 ohm “short,” so I’m<br />
not particularly concerned, just curious.<br />
I performed a quick Google search, and<br />
one DIY site instructs to use a 470 ohm<br />
resistor. Given <strong>that</strong> most power amps<br />
have an input impedance of 20,000+<br />
ohms, why 147 ohms versus 470 ohms<br />
or anything else?<br />
Finally, any idea of where to buy<br />
shorting plugs? I’ve called a few true<br />
<strong>audio</strong>phile stores in my vicinity, and thus<br />
far nobody carries them. I’d assumed<br />
they’d be an easy accessory, like spikes<br />
and cones. Even you don’t sell them!!!<br />
Jeff Tennant<br />
BURLINGTON, ON<br />
No, we don’t, Jeff, because the market<br />
for them would be vanishingly small. We<br />
can easily make you up a pair if you want.<br />
The manual for the old Celeste 4070<br />
power amplifier (we still own one) does<br />
indeed refer to a dummy load, though<br />
later documentation was changed to<br />
refer to a shorting plug. We measured<br />
the resistance of the dummy plugs on<br />
our Moon W-5LE (an evolution of the<br />
older Celeste 4250SE), and came up with<br />
2.2 ohms. That’s the resistance of the<br />
instrument cables and connectors.<br />
The Celeste and Moon units use<br />
differential amplifiers, with inputs for<br />
the inverting and non-inverting inputs.<br />
They are thus naturally balanced without<br />
the addition of extraneous circuitry,<br />
which is a good thing. With a singleended<br />
(unbalanced) input, you would<br />
connect the unused input to ground, or<br />
nearly to ground. In the newer Moon<br />
amps, the plug really is a shorting plug.<br />
My system consist of a PS Audio<br />
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player (for SACD), McInTosh PT10<br />
turntable with Clear<strong>audio</strong> Stradivari<br />
V2 MC pickup, VPI Scout II TT with<br />
Clear<strong>audio</strong> Virtuoso MM. I have a<br />
McIntosh C2300 tube preamp, a pair of<br />
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