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#98726 - 01/28/20 12:59 PM Thump in subwoofer
Prop Rider Deputy Gunslinger Registered: 06/03/06 Posts: 6 Loc: NY	I have the Outlaw LFM-1 Plus subwoofer connected to the 976 RCA Sub Out connector. With the 976 and the power amp in off mode I get a very noticeable thump out of the subwoofer every few hours or so. Any thoughts on what may be causing this?
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#98728 - 01/29/20 11:50 AM Re: Thump in subwoofer [Re: Prop Rider]
butchgo Desperado Registered: 06/22/07 Posts: 369 Loc: Southern Oregon coast	Do you have the power switch set to auto? That can sometimes cause that because the amp doesn't a strong enough signal and it shuts itself off. _________________________ Epson 3500 3D projector 93" Carl's Place Flexiwhite DIY screen Outlaw 976 Pre/Pro Outlaw 7500 for LCR & L/R surrounds 1- Emotiva Mini X-A100 for rear surrounds 2- Outlaw LFM-1 EX subs Oppo BDP-105 Blu-ray/DVD/SACD player Outlaw LCR (Snell Labs) for center channel duty Tekton Lore monitors L/R 4- Emotiva ERD-1s surround speakers Monster HTS3600MKII power center
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#98729 - 01/31/20 10:37 AM Re: Thump in subwoofer [Re: Prop Rider]
EEman Desperado Registered: 11/11/09 Posts: 514 Loc: Canton, MI	Yes, I've had that problem albeit with different components. The problem was caused by a ground loop combined with dirty power. There was enough of a ground offset that the sub would occasionally turn itself on producing a noticeable thump. Are your components on different circuits? Do you use a power conditioner? _________________________ 975/7075/SMS-1 Aperion Verus Grand Towers & Bookshelves, Verus Forte Center, Infinity Surrounds, Ultra-X12 Oppo BDP-203, XBOX360, Xbox One LG 65" OLED RR2150 w/Klipsch SCR-2
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#98730 - 02/01/20 09:39 PM Re: Thump in subwoofer [Re: butchgo]
Prop Rider Deputy Gunslinger Registered: 06/03/06 Posts: 6 Loc: NY	I actually had the subwoofers on "ON", have switched them to "AUTO" and I don't believe I have heard the thump in a while. This doesn't make a whole lot of sense but I'll keep an eye on it.
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#98731 - 02/01/20 09:44 PM Re: Thump in subwoofer [Re: EEman]
Prop Rider Deputy Gunslinger Registered: 06/03/06 Posts: 6 Loc: NY	Thanks for the "ground loop" idea. Had not thought of that devil. The Amp is on its own circuit so there is that potential problem.
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