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Left side of amp does not work. all left channels do not put out sound

I am using a bose speaker system with 2 sets of cubes two mids and a base preamp that hooks w left and ride sides to the amp in question and also to the cubes. i can't make the left channel out of the base preamp to the cubes work. or the left channel to my mids. what the fuck

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How do I hook up my bose 901s to this unit?

Well the basic connection of the speakers would be the same as another stereo speaker pair. Wire the left and right speakers to the L/R Front Surround speakers on the Denon.

With the 901's I am assuming that there is an external equalizer supplied by Bose. Typically this EQ is installed in a tape loop on the receiver/amp so that it is ahead of the power amplifier that drives the speakers. This EQ needs to be there to attempt to get reasonable frequency response from a speaker that has only 4" drivers. I'm not sure I see any reasonable way to make the EQ work with the Denon AV receiver. You'd likely be better off using the Bose speakers in a dedicated 2-channel stereo and getting a set of speakers for the AV usage.

Apr 16, 2016 | Denon Avr 3805 7.1 Channel Audio Video...

4 Answers


go to audio set up and configure the system for 5.1 or higher sound output.then only all the speakers ll work

Jan 03, 2008 | Yamaha RX-V640 6.1 Channels Receiver

1 Answer

Hi There, I have a Marantz SR7005 Receiver and Bose 901 Series VI speakers with the Bose equalizer. I'm struggling to figure out the best way to connect the Bose equalizer/speakers to the SR7005. ...

It sounds like you've read one of my many posts on 901 deployment in the AV world.

Functionally, what is the difference between one amp with 'x' channels or 'x' mono amps? Nothing. Pre-outs don't know or care what else an external amp does.

According to this link those amps are 2- and 5-channel, respectively.

There was a time when I had two bridged-mono Carver Cube atmps (at a real 400 watts) pushing one 901 each but that was big time overkill.

I now use a Carver AV-406 (functionally the same as your MM7055) with the 901 EQ in between the AV Receiver's front pre-outs and two 110-watt channels. Other channels on the AV-406 pull subwoofer and surround back duties. My AVR directly powers only the center and surround speakers.

The MM7025 would work for you.

Jul 07, 2011 | Marantz SR7005 Receiver

1 Answer


hi there
have u tried connecting the centre speaker to another amplifier to see if the speaker actually works....

if it does then it cud be the output transistors blown or the actual OP-Amp for that channel

Feb 23, 2009 | Harman Kardon AVR 130 Receiver

1 Answer

Pioneer vsx 90txv and bose EQ

I wrote this for a different receiver, but if you account for minor differences to your receiver this will work just fine.

There's good news and bad news. The bad news you need a separate amp because a multichannel receiver with Bose 901's attached as recommended for a standard stereo receiver will only sound right in STEREO on stereo analog material. The other speakers around the room are not designed to receive its Active Equalization and if you engage your Tape Monitor you will NOT BE ABLE TO HEAR DIGITAL sources at all. Tape Monitor is for analog stereo material only and on modern AV receivers it disables any digital inputs so you really can't use the Tape Monitor circuit or attached devices for modern digital sources. However, you can still employ the various DSP options to spread 2-channel analog source material around the room. I do.

The good news. I have a setup similar to what you want to do and it works great! With one caveat - My receiver actually has 5.1 analog Outputs so I can drive up to 6 external amplifiers if I want to (I drive 4). IF yours does NOT (*) we have to be creative in extracting the front two channels from your multi-channel receiver. The obvious alternative place would be at one of the few OUTputs on the back, assuming you have one free to use.

* I can't find your exact manual so I have to extrapolate features.

I see on the SR>6003< there are Pre Audio OUTS so I'm betting your receiver does, too.

A separate stereo amp for the 901's was my solution. I run a Carver AV-406 (5-channel amp) for my 901's in Front, 2 Subwoofers and the Rear Surround channel, with the Active EQ between the receiver Front L&R Outputs and the 901's amp channels. My receiver controls everything and just drives the Center and Surround speakers.

You could get by with just a stereo amp for the 901's. A Carver M-200 is a good efficient amplifier that would have you cooking just fine (2x100W). Run it with the Active EQ between the receiver Front L&R Pre-Outputs ** and the 901's amp channels.

** Front Pre Out; (or VCR or Tape Out if you don't have Pre Outs) >>> Bose EQ Amplifer IN, then
Bose EQ Amplier OUT >>> new amplifier IN.

Attach the 901's to the new amp, set its volume to Max and run through your receiver's speaker level setup.

*** If you use a Tape or VCR Out you will NOT be able to SELECT the source you use for the 901 Pre-Outs for listening, or else the 901's will not get any sound sent their way. DO NOT USE the monitor switch for that source.

Feb 01, 2009 | Pioneer VSX-90TXV Receiver

2 Answers

Bose 901 iwht tx-sr 706

You will need to connect the speakers to the front channels as you would with any normal set(Speaker + to amp +, speaker - to amp -, etc) then you connect the special Bose equalizer through a tape monitor loop and always have the monitor loop engaged.

Dec 27, 2008 | Onkyo TX-SR705 Receiver

1 Answer

Hafler power amp has one side out. Would like local repair.Series 9300.Approx.10-15 years old.Not used much.Second time to blow.Runs 4, 8om speakers including 2 bose 802,s (no bose controller or eq in...

just discovered same problem with my Hafler DH-200...right channel out but no obvious problems inside (no loose/burned wires, components, etc). Driven by Hafler pre-amp, but definitely power amp problem.

Sep 03, 2008 | Audio & Video Receivers

1 Answer

Bose Acoustimass power

the amp is overheating. Disconnect one speaker at a time to see if problem persists. If so, the amp needs serviced.

Nov 08, 2007 | Onkyo TX-DS575 Receiver

6 Answers

Multiple speakers in same outlet

How this reciever is set up is there are left and right A and left and right B Only one 8 ohm speaker should be attached per outlet. if you exceed that your driving the channel at a much lower resistance then the units designed for and the channel will burn up.. Oh it might last a short time but bet your last dollar it will burn up the channel if you over load it. Please dont forget to rate this.

Oct 15, 2006 | Pioneer VSX-454 Receiver

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