Question about Bose 901 VI Main / Stereo Speaker

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Bose 901 Equalizer connections to Harman Kardon AVR520

Would you kindly tell me exactly which connections on the back of my AVR520 for the equalizer in/out? Thank you.

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  • Anonymous Nov 27, 2008

    I have the same problem. I have connected the Bose 901 speakers to Harman Kardon using the Bose Equalizer. Howvere, I have connected the Bose to the FL and FR channels - however, it seems that the other channel sound gets filtered out. Can/ Should I connect additional speakers to other channels? If yes, how can I find compatible speakers?

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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.

If your receiver has 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.

Posted on May 16, 2009

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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 http://www.ecoustics.com/electronics/products/new/642968.html 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.

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Amp out and amp in for bose eq.hook up


  • 1

    Examine your receiver to be sure it has a tape monitor loop. Receivers with a tape monitor loop will have a button or switch on the front for "Tape Monitor," and have two sets of RCA connections on the back, one labelled "Tape In," and the other "Tape Out."

  • 2

    Take the two cables that are provided with the 901 speakers and insert one end of the first cable into the "Amplifier Input" jacks of the equalizer. Connect the red connector to the R input and the other connector to the L input. Connect the other end of this cable into the "Tape Out" connections on the receiver. Again, hook red to R and the other to L.

  • 3

    Connect the second cable between the "Amplifier Output" jacks of the 901 receiver and the "Tape In" connections on the receiver. Follow the guidelines in Step 2 for R and L connections.

  • 4

    Plug the 901 equalizer into a 120-volt electrical outlet. Your 901 equalizer is now installed.



  • Read more: How to Install a Bose 901 Equalizer ' eHow.com http://www.ehow.com/how_4813156_install-bose-equalizer.html#ixzz19vfsJTQu

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