Hk avr 247

Medjai
Medjai Posts: 7
edited April 2009 in Electronics
If I have my subwoofer connected to the subwoofer pre-out and my tv connected thru ANY (hdmi, composite, component) video output there is a buzzing noise. If the pre-amp'd output is disconnected the hum goes away and if I unplug the video output the hum goes away. Assistance in this matter would be appreciated.
Post edited by Medjai on
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  • cnh
    cnh Posts: 13,284
    edited April 2009
    Sounds like a ground loop problem, very common with video gear/cables. Try switching equipment to different outlets that are on different circuits, if possible, there are also some devices available at www.part-express.com (cheater plugs) that are supposed to help with this...haven't used them...so you'll have to wait for the guys to come in on this one.

    cnh
    Currently orbiting Bowie's Blackstar.!

    Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
    [sig. changed on a monthly basis as I rotate in and out of my stash]
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  • Medjai
    Medjai Posts: 7
    edited April 2009
    Thank you for the response. I ran an extention cord from another part of the house and the hum was still present. I also tryed two different subs and tested all the pre amp'd outs. It seems any combination of pre-amp outs and monitor outs cause the unit to hum.

    I bought this unit as a refurb from the HK ebay store. I emailed them and they are suppose to respond withing two days. I am just worried because they state they will not cover the cost of shipping but hopefully they will if it is infact a defective unit.
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  • thuffman03
    thuffman03 Posts: 1,325
    edited April 2009
    I might also try putting the sub on a power conditioner. Something like an APC H15. I have seen them going on ebay for about $150. APC was selling off the white ones for $149 a while back.
    Sunfire TGP, Sunfire Cinema Grand, Sunfire 300~2 (2), Sunfire True Sub (2),Carver ALS Platinum, Carver AL III, TFM-55, C-19, C-9, TX-8, SDA-490t, SDA-390t
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