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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: Marantz DC170: AC coupling vs. DC coupling ??? posted by Jeannot on February 4, 2006 at 14:55:15:
AC coupling means there is a coupling capacitor in series with the input and below some very low frequency, the amp rolls off. DC means that the amp will pass the output of a flashlight battery and amplify it (don't try it). At one time DC coupling was a fad. It can cause many more problems than it solves. In fact, unless your preamp is AC coupled at its output, you should not use the DC setting.If you're happy with the sound you have, in the AC setting, leave it!
The problem with DC coupling is that any DC leakage from the preamp is amplified and this can move your woofer off center, reducing its linearity and creating distortion. In extreme cases, it can overheat the voice coil and/or move the woofer cone way in or out and hold it there. These things are all silent and you'd have no idea it was going on until something failed.
You might want to consider replacing the input coupling capacitors with premium ones of the same or slightly higher value. That might give you nicer highs and mids.
Jerry
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Follow Ups
- Re: Marantz DC170: AC coupling vs. DC coupling ??? - Bold Eagle 10:48:22 02/05/06 (0)
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