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| Author |
Message |
keesan
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Equipment for playing music
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Mar 17 00:26 UTC 2002 |
Discuss the hardware aspects of playing music - tape decks, receivers,
CD-players, boomboxes, etc.
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| 65 responses total. |
keesan
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response 1 of 65:
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Mar 17 00:30 UTC 2002 |
We have seen numerous boomboxes with a switch on the back labelled OSC on/off
or beat cut A B or even A B C. Does this apply to the tape or radio, and what
exactly does it do?
On some tape decks there is a button or level labelled Memory (on/off). How
does this work? And how do you use MPX filter on a tape deck - it is
sometimes associated with Dolby? Does a Limiter switch limit the peak volume?
What is auto repeat used for? Some decks have a timer feature - where do you
get a timer to go with it and what would they cost, or can you make one?
On a CD player, what do auto cue and time mode do? I discovred what hitting
repeat does - it plays the same track over and over and over and over....
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keesan
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response 2 of 65:
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Mar 17 00:39 UTC 2002 |
Jim asks what happens if you put 3 ohm speakers on a boombox that calls for
4 ohm speakers, will it damage either the speakers or the boombox if you don't
play music loudly? He is proud to report that he is halfway through replacing
the foam surrounds of a couple of AR woofers with foam surrounds that he
carefully removed from some passive radiators (they look like speakers but
have no magnet or coil). Today he glued (with carpenter's glue) the foam to
the cones, and tomorrow when it is dry he will glue foam to metal frame.
www.simplyspeakers.com sells new foam surrounds for $27/pair and was kind
enough to tell him old ones could be reused, and emailed instructions. Remove
the old foam with sharp knife and alcohol. He also glued the loose copper
coil of another speaker back into its cardboard tube, with superglue, after
carefully slicing off the dust cap (which he will glue back on tomorrow).
It probably came loose when someone played very loud music. THe matching
speaker to the pair had a broken wire which probably happened after the coil
came unglued. Perhaps the glue just dried out first.
The neighbor gave him the superglue, along with a 10" woofer that has a
disintegrating cone. Anyone have any dead 10" speakers to give away?
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krj
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response 3 of 65:
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Mar 18 21:04 UTC 2002 |
((( Classical 65 <---> Music 82 )))
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krj
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response 4 of 65:
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Mar 18 21:12 UTC 2002 |
The MPX filter on tape decks is designed to get
rid of the 19kHz pilot signal ("multiplex carrier"?)
which is part of the FM radio signal. That signal can trick the
Dolby noise-reduction circuitry into misbehaving, and it may cause some
other effects; I've just noticed that in my recent taping of FM radio,
I get a lot of funny effects unless the MPX filter is on.
Someone else needs to explain the theory of how FM Stereo works,
and how it was desgined to be compatible with monaural FM.
MPX filter should theoretically be left off for tapes from other sources
such as records and CDs, though at our age, and with the presumed quality
of tape decks you are using, it probably wouldn't be a problem to
leave the 19kHz filter on all the time. Experiment!
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krj
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response 5 of 65:
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Mar 18 21:18 UTC 2002 |
For a tape deck designed to work with a timer, any external timer which
would control an AC power outlet would do. The "timer" switch
generally has two choices: one to start tape playing when the power
comes on, and one to start tape recording when the power comes on.
If you want to use your equipment to record on power-on,
you have to be VERY, VERY CAREFUL about tape management,
otherwise eventually you will make the mistake of turning the
machine on while a valued cassette is in the machine,
and the machine will merrily erase the recording.
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