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Bose 901 equalizer

How to I connect a Bose 901 equalizer to a Yamaha RX-461 receiver. Can I find the Channel A PA inputs, and insert it there? Does anyone know where the PA input is?

Mark

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  • Cembalo Mar 29, 2008

    Hi Graeme,
    Unfortunately the Yamaha RX-V461 doesn't have a tape "monitor" loop or pre-out-amp-in jacks - only a constant volume line-level output on the md/cd-r output and the dvr output to record externally. (My 35 yr old Technics had both tape 1 and tape 2 "monitor" switches but died.) I would try to trace back the PA power transistors for L & R for speakers "A" and find their line-in point with an audio probe, cut the PC board runs if necessary, and solder pre-out and amp-in RCA lines running out the case to connect the 901 equalizer. What I don't know is how many stages the PA consists of or if the 5 channels of PA's are a separate pc assembly. (I haven't taken it apart yet.)

    I assume Yamaha uses this PA circuitry on many models and possibly another 5.1 schematic might be of some help. The RX-V461 schematic I can't find on the internet and a parts request to Yamaha has not been answered yet.

    Many thanks,

    Mark

  • alleycat1253 Jul 17, 2008

    HI, ..I RECENTLY BOUGHT A PAIR OF BOSE 901 SERIES 4 AND IT CAME WITH THE BOSE 550 AM/FM RECIEVER WITH BUILT IN SERIES 4 EQUALIZER...IS THERE A WAY TO HOOK UP AND USE JUST THE BIULT IN (EQ) AND HOOK IT UP TO A MORE POWERFUL RECIVER..ON BACK OF RECIEVER I ONLY HAVE 3 CONNECTION CHOICES AND THEY ARE...(AUX)..(PHONO) AND (TAPE " IN,OUT" "R +L "........CAN YOU HELP ME?.........THANKS ALLEN

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Hi Mark, had a look for a manual on your Yamaha, but not got to one as yet. Does it have any RCA connections on the back marked as preout prein? best place to put the 901 EQ is in line with L and R front channels at this preout prein point.

Some amps DO NOT HAVE IT. If our does not, then you could connect it in the tape loop, tape out(rec) to input on the EQ. and the output of the EQ connected to tape in(play), but connected like this, the EQ would affect the tone across all channels(unless you are just running a stereo rig, then this way works great!!) Try this and you may just have solved you problem anyway.

regards
Graeme

Posted on Mar 29, 2008

  • Graeme Ross
    Graeme Ross Mar 29, 2008

    Hi Mark, it is usual for there to be some sort of tape monitoring involved in a tape loop. Not a deliberate "monitor" as such, but you should still get audio to loop when you have selected one of the "tape" style functions. Do you have a VCR in/out for instance. That could be used as a loop, the actual source selection then made by changing the REC out selector(leaving the unit main source selection to VCR)

    went looking for a manual again, but came up nada. I know it sounds silly, but can you recheck the model for me. I have found plenty of listings under your model, which would tend to point to it being a released model, but odd that there seems to be no docs on it, even at Yamaha. Will keep looking

    regards
    Graeme

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I have a Yamaha RX-V992 receiver and I would like to install a Bose 901 active equalizer Where will I connect this to my receiver? Thanks Mark


Basically here are the connections you have to do:
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In case you don't have tape recorder forget the "box" named tape recorder. Your RX-V992 is the box named receiver or preamplifier. You have to connect with RCA - RCA cables the tape out from the RV-X992 to Bose input, and the Bose output to tape in at RV-X992. With the setup connected like this whenever you choose from the RV-X "tape monitor" you will hear the sound equalized from Bose; if you disable the "tape monitor" switch you will hear without any equalization.

In case of a problem or clarification, don't hesitate to post me a reply.
If you are satisfied, rate my solution with the "thumbs".

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Please kindly rate this solution
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direct FixYa link: http://www.fixya.com/users/technical114

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I have a Yamaha RX-V992 receiver and I would like to install a Bose 901 active equalizer Where will I connect this to my receiver? Thanks, Mark


The use of 901's in any digital AV receiver setup for anything EXCEPT STEREO listening through the 901's alone requires you to have a separate amplifier for them and to avoid having to use a Tape Monitor.

That is because if you activate any Tape Monitor circuit at all, you will kill any digital sources. That is a function of AV receivers in general, nothing to do with 901's. Assuming you want the 901's as part of your multichannel sound, you need to get a dedciated power amp just for the 901's and you don't need to use a Tape Monitor loop.

You can draw the Front Left and Right signals out of the Main Out connectors, go into the Active EQ's Amplifier IN Connections; then Out of the EQ's Amplifier OUT Connection to a separate amp and attach the 901's to that amp. This way you won't introduce proprietary and potentially damaging Active Equalization back into anything in the AV Receiver with its conventional speakers.

Run through the speaker level settings with the new amp at a suitable volume setting (if it has a volume knob; many don't). Then leavethe amp volume control alone.

The AV Receiver can still drive the Center, Surrounds and the Sub(s) as it is designed and control the volume on everything.

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I have a question first... are the 901's amplified by a separate amp as they should be in a multi-channel (non-stereo) setup?

Better yet read the following then decide if you have iy set up right to begin with. If so, I'd just treat the Ipod or Mac as auxilliary inputs on the receiver. :

I wrote most of 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.

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