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- Newsgroups: rec.audio
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!linac!uchinews!gsbux1!cal
- From: cal@gsbux1.uchicago.edu (Cal Lott)
- Subject: Re: Velodyne ULD-12 hums - why, and can it be fixed?
- Message-ID: <1992Dec29.035332.20262@midway.uchicago.edu>
- Sender: news@uchinews.uchicago.edu (News System)
- Organization: University of Chicago Computing Organizations
- References: <18969@mindlink.bc.ca>
- Date: Tue, 29 Dec 1992 03:53:32 GMT
- Lines: 35
-
- Mike_Benna@mindlink.bc.ca (Mike Benna) writes:
-
- >2 months ago I purchased a Velodyne ULD-12 and I have only one complaint
- >about it: it hums. Not loudly, but it hums. Even when everything else
- >around it is unplugged (except the control unit), it hums. It sort of
- >sounds like transformer hum and it seems to be coming from the speaker
- >(I haven't turned it over to verify). Since it hums even when it is the
- >only thing plugged in (and all speaker leads are disconnected), I'm sure
- >it's not a ground loop problem.
-
- >1) Is this normal?
- >2) It wouldn't be so bad if the unit would automatically shut off after
- > several minutes of inactivity. Any idea why the Foundation series
- > has the auto shut-off but the ULD series does not?
-
- >Thanks in advance for any suggestions which will help me to solve (or
- >give up on) this problem.
-
- Is the sound coming from the woofer itself? If so, it is
- possible that the active servo circuit of the Velodyne thinks that it
- is receiving an input signal. (For those unfamiliar with Velodynes,
- most models have an accelerometer in the voice coil of the woofer
- that allows it to monitor the actual woofer movement vs. the input
- signal and make corrections as needed.) You should also be able to
- check the woofer with your hand as well-- if you feel any vibration,
- you know you have some sort of problem.
-
- Good luck.
-
- -Cal
- --
- ----------------------------------------------------------------------
- Cal Lott "Oh, I see-- I thought 'no' meant 'spoon'!" --Dan
- Email me, baby! cal@gsbux1.uchicago.edu cjl1@midway.uchicago.edu
- ----------------------------------------------------------------------
-