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I know I can safely turn on a solid state amp without speakers hooked up With a simple amp can you test for the DC offset with nothing plugged into it, or do you need to have a pre amp connected even though you would be testing to a non used source at the lowest volume possible. I guess I am asking, is there any kind of circuit change that occurs in the amp when the pre amp is plugged in, or can I just plug in the amp and check the speaker terminals. Norm
PS - if anyone has the owners manual for the adcom 545 mkII, I would sure love a copy. Thanks
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I got 0.41 mv on one channel and 1.21 mv on the other, so I am good to go. Norm
shouldn't it be zero?
but I am guessing that these are really very good especially when you work out the formula for power the speakers see. I don't remember it now, but maybe others can chime in. There is a long thread on AK in the solid state forum , DC offset and you. Norm
In engineering schools there was a classic anecdote about "close enough". I think these measurements qualify.
At DC:
(P = watts, V = volts, R = ohms)
P = V^2 / R
R = 8 (typical)
V = 1.2 * 10^-3
V^2 = 1.44 * 10^-6
P = V^2 / R = 1.44 * 10^-6 / 8 = 0.18 * 10^-6 = about 1/5 of a microwatt
That will cause negligible voice coil heating and virtually zero deflection of the voice coil in the gap. Nothing to worry about.
Those readings are fine.
go over to hifi engine and login. A wealth of manuals and schematics for free. Sometimes it's fun to cross reference a stereo mentioned
PM me with your email and I will send you the service manual.Or, click on the link and download the top one (II).
Meat; It's the right thing to do. Romans 14:2
Edits: 10/13/16
Yes it is ok, you do not need anything connected to the input.
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