Question about Bryston BP-25 Amplifier

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No right channel output

Hello, I just purchased a set-up that includes a BP-25 and 4B-ST power amp. I am not able to get any sound from the right channel and after doing some isolation tests, I am pretty sure it is the output on the pre-amp that is at fault. One thing I noticed, is if I turn the balance completely to the right so I hear nothing, and then start cranking up the volume, when I get to a reasonable high volume, the right channel suddenly activates (at the right volume) but when I turn it back down, I lose the channel again. Has anyone experience this problem before and/or can anyone suggest a solution? The source is a Linn Ikemi CD Player and I am positive both speakers are working fine. -Matt

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Re: No right channel output

Feed the amp with the left channel preamp to the right channel input on amp and check output. If you get output from amp then pre amp nedds to be checked out if still no output then amp is suspect. Randy

Posted on Feb 25, 2007

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NAD C320. Only one channel sounds. Problem with the volume control?

Did you try to switch the loudspeakers? Before changing anything always lover the volume and switch off the amplifier.
Assuming you tested already different inputs, you can be sure no cable from signal source is out or defect. (or did you nit check that first?).
When the amp is switched off, disconnect the speakers and switch left to right and right to the left output.. If the other speaker is quiet now, you are sure it is in the amp. Still his can be anything.
You can check the connections between the pre and main amplifier on the back side. When you have an extra set of interlink cables, perhaps you can cross the in and output there too. Take care every time you change something, lower the voltage and switch off the amplifier. Sudden clicks when switching on or changing anything can damage the amp and or the speakers.

Perhaps when you checked this you can locate where the problem is? Speaker, speaker cable, power amp, pre amp, (only a part of the pre amp.

Nov 12, 2013 | NAD C320 2-Channel Amplifier

1 Answer

Volume at 10 produces very low speaker output.!?

It sounds to me that all you are getting is the pre-amp stage of the amp and nothing from the power amp stage. As it is on both channels then it is something that is common to both. This could be something to do with the power supply of the power stage. Or whatever is on the heatsink. It could be that the amp uses a single audio amp IC for both channels. If it does my bet is that it's gone. If it uses two sets of semiconductors for the right & left channel it would be highly unlikely that both channels have gone, but not impossible.

Dec 27, 2009 | Amplifiers & Preamps

1 Answer

Purchased 2 used sonance sonamp 260 for homewide speaker system (12 pair).line out from receiver into first amp powering first 8 pair.line out from first amp into second amp powers remaining 4pair.only...

I am assuming you are using the standard sonamp 260 not a 260x3
and that when you say you are getting sound on only 1 pair that means only on 1 side (left or right channel only?)

Are using a speaker selector box? you must to regulate the resistance (ohms)

if so first unhook all but on pair of speakers and see if both channels are working.

if they do your problem is in the speaker selector not the amp if no then check to see what the amp level is set to. These are the two small holes on the front right of amp make sure they are set about equal at around half way up.

If that doesn't work flip the RCA cables coming to the amp perhaps you have a bad cable if that doesn't work make sure your receiver (source) is outputing a stereo signal to begin with.

lastly 8 sets of speakers off 1 amp? that's pushing it.even with a high quality Niles or speakercraft selector that controls the resistance going to an amp I wouldn't go past 5 sets.

The right way to do it would be to use 260x3 or a sonance or speakercraft 12 channel amp.

Nov 04, 2009 | Sonance Sonamp 260 MKII 2-Channel...

1 Answer

I don't have any instructions so i don't know how to hook up my speakers and the t.v for surround sound i have a carver avr 100

You should be able to online to the manufacturer of your products and download manuals. However, I will try to help.

Connect the sound output cables from your DVD player including, left/right(white/red) as well as the Coax output/input if your DVD and your Carver each have this feature for enhanced sound on certain DVDs, and connect to the matching DVD inputs on your Carver.

Then, connect your DVD video output either by use of your RGB(RED/GREEN/BLUE cables or an S Video cable to your the matching video inputs on your t.v.

On the back of your Carver, you will find outputs for left and right speakers, connect to the left and right speakers with proper wire. Make sure that the 2 conductor wire is connected with the same side(polarity) on all speakers for the best sound quality.

You will also find rear channel left and right outputs on your amp, connect those to your rear right and left speakers.

Connect the center channel speaker to the center channel speaker output on your amp.

If your Amp has a sub-woofer output and you have a subwoofer, make the connections on that as well.

Test all of the speakers with a feature that many amps have on the menu using your remote, simply called test. if all speakers are connected correctly you will be able to hear each one as they are individually tested by the amp. Hope this helps out.

Oct 05, 2009 | Amplifiers & Preamps

1 Answer

Left channel volume is very faint as compared to the right channe

It sounds like the preamp section is working but the power amp is not. Look at the power supply section and see if it is getting power to the power amp and if ok check the power transistors or IC.

Feb 13, 2009 | Yamaha Amplifiers & Preamps

1 Answer

How do I connect a Polkaudio powered subwoofer (psw 125)

Connect a set of stereo RCA cables from the 'Output 2' on the Hafler to the line imputs on the Sub.Turn on the '1+2' output switch on the Hafler and rock out!

Dec 16, 2008 | Marantz PM7200 2-Channel Amplifier

1 Answer


sounds like DC on that output.
needs service possibly fried all the output transistors on that channel

Jul 30, 2008 | Xantech PA1235X Amplifier

2 Answers

Technics SUV500 Amplifier

check volume balance between right and left-then change inter connection between sound source and amplifier with new cabel(i prefer gold plated type connectors)(see radio shack).
after that if the problem excit your fault in output transistors or output stereo ic depend on circuit design.

Feb 17, 2008 | Technics SUV500 2-Channel Amplifier

1 Answer

Church System

Hi there Apostledavis

I don't know this specific system and you haven't mentioned whether you have just installed it or whether it has only just started causing problems but did work ok before?
However, there are a few things I would look at. I would also check the system right from the input bit by bit to see whether the problem is an input or output one.

1) Completely isolate the amp from all other equipment and connect a signal source to the left input only and then the right input only. If they sound much the same, the amp is probably ok. If they don't then the amp is probably faulty.

2) Check whether the monitors and amp both have weak output on the left channel.

3) Check and balance settings.

4) Check the speaker phasing.

5) Check all the interconnections, plugs and sockets. You could squirt some switch cleaner on a rag then wipe all the plugs before putting them back in the sockets.

6) Check the Behringer VU meters and make sure they indicate a reasonable balance on both channels.

7) Check that the channels sound ok when using headphones.

8) Check all faders and sliders by moving them vigorously to clear dust from the tracks. (Not applicable if digital, of course)

Hope this helps

Jan 27, 2008 | Behringer EUROPOWER EP2500 Amplifier

2 Answers

Distortion in one channel

your right output component (transistor or integrated circuit needs to be replaced)

Nov 11, 2007 | Alesis RA-150 Amplifier

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