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AMPLIFIER SU-CH900 CUT OFF

HI,MAY I KNOW WHY MY AMP WHEN HIGH BASS IT WILL CUT OFF?

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It goes to protection mode because it draws too much current from high bass.

Posted on Jul 28, 2008

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1 Answer

Searching for technics amplifier SU-CH900 or SU-CH700 i want to buy it ...i m from spain


Not a good brand to buy its low end. However thats an old model so you would have to keep looking on Ebay for something like that.

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Technics SU-CH900 turn off when the volume up ....


That's usually caused by incorrect loading (eg: 2 ohms on a 4 ohm circuit) or failed components in the power supply or final amplifier stages.

Mar 09, 2015 | Technics Audio Players & Recorders

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I have a technics hifi su-ch900 everytime I play a cd or cassette or have the tuner the sound cuts out when its slightly loud, on low volume its fine. I have checked the cables and they are correctly...


I found a link to a CH900 that switched off completely.
If you are not a technician, please don't open the amplifier.
But I think it will be a simple repair. It is not the same problem, but it looks a little simelar.

http://www.electronicspoint.com/technics-su-ch900-switching-off-t53309.html

Also found a service manual, but not complete. Still here is the link

http://elektrotanya.com/technics_su-ch900.pdf/download.html

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Why does stereo amp cut out at higher volume


You seem to have the answers to your question. I would just resolder the connections anyway without checking. If it solves the problem you have saved yourself a lot of money. If it doesn't follow the other steps in order of cheapness!

May 03, 2013 | Audio Players & Recorders

1 Answer

Bass cut off when volume is too high


When an amplifier shuts the Bass off that means its going into protection mode otherwise it will burn out the outputs. One way is to turn your gains down, Pioneer amps are not the best amps for bass out there, they are more for car speakers, I personally wont use a pioneer amp to run my subwoofers especially if they are hard driven subs like JL , Kicker Solo's and MTX subs. But for now just turn the gains down to 3/4 and that should help u, you can also install a fan to keep your amp cooler, if this never happened before in 5 yrs and now it does then that means your amp is just tired and the inside components are overheating easily, thats common with Pioneer and Sony amps.

Good luck buddy.

Lex...

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hello. we cant help if we dont know what music source you are using.

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amp 101

1/0 wire to the amp or the amps will loose power

check the connections mainly the negative

wiggle the wires see if you get a cut out or not

a cap will help you give constant power to the amp and not allow them to drain on long bass notes

hope this helps

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Sometimes an amplifier's preamp can't handle certain signals/frequencies at a high gain, so they cut out. Bass guitars are especially prone to giving such a strong signal.
I bought an older, nonworking bass amp recently and fixed it just to find it had the same problem. Best solution is to put a low ohm resistor at the amps input, but if you turn your guitar down to half volume it'll have the same effect: should prevent it from cutting out.

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1 Answer

Need help


u should connect at least six 12" subwoofers (preferably 1000W each) to that pioneer amp of yours. Crank it up and enjoy. Your amp shouldn't cut off now. If it does cut off, you should change the fuse on your amp to a higher ampere.

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