I've installed this sub with a pre amp out from my receiver. The sub produces good sound, but it has a hum.....as soon as the unit is powered up and does not increase in volume with an increase in the sub volume. The manual mentions this, but it's inside a cabinet and I can still hear it. Sounds like a ground loop. Kinda bugs me.
Any suggestions would be appreciated.
[ This message was edited by: kupgas on 2006-02-04 13:30 ]
Joined: Mar 13, 2003
From: Sewell, NJ
Posted: 2006-02-04 15:44
Welcome to Agoraquest! You're right, it does sound like a ground loop. From the schematic, I see that the sub doesn't have a three prong plug. Therefore, its ground reference is that of your receiver's preamp output. Tell us more about your receiver. What is the make and model number? Does it have a two or three prong plug? Do any of the components in your system have a three prong plug? If so, which ones? Another possibility is that the cable from your receiver's preamp output passes through a strong magnetic field, such as that produced by a power transformer. If so, the cable routing might make a difference.
Sony A/V System: KDL-55XBR8, BDP-S550, AVD-C700ES Super Audio CD/DVD Receiver, 4 SS-LA500ED surround speakers, 1 SS-LAC505ED center channel speaker and 1 SA-WD200 Active Subwoofer
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