From: rmp@crashnburn.Eng.Sun.COM (Richard Pottorff)
Newsgroups: rec.audio
Subject: Re: Speaker Crackling (popping)
Date: 15 Dec 1992 23:45:05 GMT
Organization: Sun
Distribution: na
NNTP-Posting-Host: crashnburn

In article <1992Dec12.001455.20188@cs.brown.edu> cs123052@cs.brown.edu (Michael Lee) writes:

	I have this problem with the electrical noise in my dorm room.
(I think).  The power lines in the room don't seem to be "clean".
I have a Nakamichi TA-2A receiver hooked up to Celestion SL-6si
speakers.  When ever I, say, turn on my room light (flourescent), the
time in which it takes the light to turn fully on causes a popping
noise out of my speakers (when the receiver is on, that is).

Likewise, I get a big pop when I turn my CD player on as well (which is 
located next to it.)  The fridge, Also does this too, whenever the
condensor kicks in.  The CD player is connected to the same power strip,
but the Fridge isn't. 
The Thing is, my Computer doesn't do this to my speakers, and neither 
does my tape deck (a/d/s/ C4), which is also located next to the receiver.

This happened in someone elses room, so I brought the receiver to be
serviced.  A couple weeks later, it came back to me with a note from
the technician that he had benchtested the thing for 1 week straight and
couldn't replicate the symptoms (thank god it was under warrantee).

So, I'm assuming that this popping noise in the speakers is a problem with
the electrical lines around here.  Is there some way that I could fix this?
Would something like Adcom's ACE-515 help? [not sure abou tthe part  #]

And why doesn't the tape deck affect this? could it be magnetically shielded
inside?  Oh, the CD player always kills FM reception when it's turned on...

Any suggestions would be greatly appreciated.

- mike
cs123052@cs.brown.edu
michael_lee@brown.edu



I write:

Yup, the power lines aren't clean.  You are getting transient responses
coupled thru the power lines to your reciever.  I'm not surprised the
fridge causes a pop.  I have a Tripplite active power line conditioner.
It filters the transients, and also boosts the voltage up to a nominal
value (low power line voltage might be exacerbating your problem). A power
conditioner might solve that problem.

The CD player wiping out the FM reception is another problem. You need to do
a little bit of experimentation to see how the CD player is getting coupled
to your FM set.

First, remove, and replace left and right channel patch cords from the
the CD player to the stereo one at a time, and see if the symptom changes.
Next, try hooking the CD power cord to another power strip, such as the
fridges, and see if that makes a difference.  What kind of antenna are
you using for your FM reception?  Is it a wall mounted dipole?  If so,
move the CD player around (while its on) to see if you can change the
symptoms.  Some fixes to this problem might occur to you when you find
the method of coupling from the CD player to the FM reciever. (Does the
CD player wipe out your AM reception too?).

Rick


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Newsgroups: rec.audio