What Would Cause......

deronb1
deronb1 Posts: 5,021
edited January 2014 in Electronics
A multi channel amp to keep shutting down after about five minutes or so. Running in bridged mono, but am in specs with 8 ohm speakers. Darn thing isnt even getting warm when it goes into protection mode.
Post edited by deronb1 on
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  • deronb1
    deronb1 Posts: 5,021
    edited January 2014
    DSkip wrote: »
    Are you sure you're presenting it an 8 ohm load and not 4 ohm?

    The speakers are 8 ohm, but am bi-wiring. Not using jumpers. Would that make a difference?
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  • Speedskater
    Speedskater Posts: 495
    edited January 2014
    Take the amp out of bridged mode.
    Eliminate the bi-wiring.
    (Neither adds anything good)

    Try again.
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  • deronb1
    deronb1 Posts: 5,021
    edited January 2014
    Speedskater wrote: »
    Take the amp out of bridged mode.
    Eliminate the bi-wiring.
    (Neither adds anything good)

    Try again.

    I have tried it in stereo mode and it still shuts down. Loses half its power in stereo too so not a big fan of that. One thing i have not tried is running it on manual on and off. Was using 12v trigger and then auto sense modes. Both kept shutting down after a bit. Ill try manual mode and see what happens
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  • tonyb
    tonyb Posts: 32,967
    edited January 2014
    What multi-channel amp are you using ? Don't see one in your sig.
    HT SYSTEM-
    Sony 850c 4k
    Pioneer elite vhx 21
    Sony 4k BRP
    SVS SB-2000
    Polk Sig. 20's
    Polk FX500 surrounds

    Cables-
    Acoustic zen Satori speaker cables
    Acoustic zen Matrix 2 IC's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable

    Kitchen

    Sonos zp90
    Grant Fidelity tube dac
    B&k 1420
    lsi 9's
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  • deronb1
    deronb1 Posts: 5,021
    edited January 2014
    tonyb wrote: »
    What multi-channel amp are you using ? Don't see one in your sig.

    Rotel RMB-1066. Its the one i bought a while back and the guy refunded my money but didnt want it back.
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  • CoolJazz
    CoolJazz Posts: 570
    edited January 2014
    Speedskater wrote: »
    Take the amp out of bridged mode.
    Eliminate the bi-wiring.
    (Neither adds anything good)

    Try again.

    Agree with the first.

    Strongly disagree with the second. Only thing it could do wrong would be add a likelyhood of a bare flying strand shorting. Everything else about bi-wiring is a positive. Very misunderstood technique.

    If the amp has a string of output devices, you may have one somewhere blown and see a symptom like this. It'd also be good to check for excessive DC on the output. And the output stage bias might be off.

    CJ
    A so called science type proudly says... "I do realize that I would fool myself all the time, about listening conclusions and many other observations, if I did listen before buying. That’s why I don’t, I bought all of my current gear based on technical parameters alone, such as specs and measurements."

    More amazing Internet Science Pink Panther wisdom..."My DAC has since been upgraded from Mark Levinson to Topping."
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  • deronb1
    deronb1 Posts: 5,021
    edited January 2014
    Well, ran it for about an hour and a half not using a 12v trigger or auto signal on mode. Did not shut off. Had it powering a pair of def tech promoniter 80s and an old Infinity center channel. No bi-wiring, but it could be that those other settings were causing it to shut down.
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  • tonyb
    tonyb Posts: 32,967
    edited January 2014
    B&W for the most part are power hungry, even their 8 ohm designs. That amp in bridged mode may not like any impedance swings under 8 ohms which yours may do. Not many in bridged mode can handle dips.

    At the start, the amp is a light weight as far as amps go, your speakers deserve better. A more high current designed amp would be more desirable.
    HT SYSTEM-
    Sony 850c 4k
    Pioneer elite vhx 21
    Sony 4k BRP
    SVS SB-2000
    Polk Sig. 20's
    Polk FX500 surrounds

    Cables-
    Acoustic zen Satori speaker cables
    Acoustic zen Matrix 2 IC's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable

    Kitchen

    Sonos zp90
    Grant Fidelity tube dac
    B&k 1420
    lsi 9's
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  • deronb1
    deronb1 Posts: 5,021
    edited January 2014
    tonyb wrote: »
    B&W for the most part are power hungry, even their 8 ohm designs. That amp in bridged mode may not like any impedance swings under 8 ohms which yours may do. Not many in bridged mode can handle dips.

    At the start, the amp is a light weight as far as amps go, your speakers deserve better. A more high current designed amp would be more desirable.

    Yeah, may not be the amp for em. It is supposed to be high current though. Huge torodial and quite heavy. It's a shame because the think is in mint condition. It looks like it came right out of the box. The guy who sold it inherited it from his uncle. He ran it for a couple of minutes to see if it worked before selling. He did not want it back or mess with getting it fixed. Can't blame him I guess, but I can't get myself to toss it either. Actually, the Pio does a decent job driving them and can live with it for a while. Just hate the jump from 50hz to 80hz in the xover. I have incorporated twin subs for 2ch and sometimes 80hz seems like too much bass and 50hz is not enough for a lot of things.
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