Quote:
Originally Posted by iQEM  just a simple question here,
my friends ask weither an HP50A able to driven by a tape deck or just a PC/laptop ? it said he could only hear the sound "ngggunnng" when driven the HP50A with tape deck...broken diafragma, maybe?
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While I myself enjoy listening to a little "ngggunnng" before going to sleep, others may find it annoying.
This question had me stumped until Kabeer pointed out that your friends might be plugging a mono headphone into a stereo jack on the tape deck. If that's true, then you need to tell them that stereo and mono plugs and jacks aren't compatible-- the stereo channels aren't summed (L+R) into a mono plug. You get some difference signal (L-R), which probably explains the
ngung. Unless you're plugging the 50A into a mono jack, it just won't work. Rewire for stereo at your earliest convenience.
As for the NAD, it isn't necessary to use a resistor network, and there's little danger (the headphone won't smoke unless you're playing it at earbleed levels), but it does cut down on residual amp noise and the amp is happier too. Take a look:
Headphone Adaptor for Power Amplifiers
