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Bose 901 Active EQ Loop

I am hooking up a bose 901 active EQ, I want to use it with my BSR EQ and my DBX Range expander. Right now i have the bose EQ hooked up last ( preamp out- Bsr EQ- DBX expander- Bose EQ- pre amp in) Is this correct or is there a better way. Should I put the bose eq first in the loop? I am not using the tape loop at all on the back of the bose eq.

Thanks in advance
Marc

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There's good news and bad news. The bad news is that a multichannel receiver with Bose 901's will only sound right in STEREO on stereo analog material. For one thing, the other speakers around the room are not designed to recieve its Active Equalization and for another, if you engage your Tape Monitor you will not be able to play digital sources. Tape Monitor is for analog stereo material only and on my receiver it disables any digital inputs.

The good news. I have a setup similar to what I think you're trying to do and it works great!

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 the dbx and BSR in tandem with each through the tape monitor loop on the receiver but be advised you can only use them on analog source stero material. However, you can still employ the various DSP options to spread the sound around the room.

At my PC workstation across the room I have a stack of analog processors and sources including dbx 3bx-ds, dbx 120x-ds, BSR Spatial Enhancer, BBE 462 Sonic Maximizer, SS-525x EQ, Carver C-9, dbx-224x, JVC cassette deck, Dual 1249 Turntable running through a Garrard MRM-101 Preamp, Pioneer PDR-509 CD Recorder and the Media Center PC stereo analog channels all running through a dbx 400x Program Route Selector (a godsend) which is attached to my ONE TAPE MONITOR on my Pioneer VSX-36TX Receiver. Of course, I have some of my analog processors running in tandem, too, since the 224x only has three processor and three tape loops.

For listening/recording anything 2-channel analog I engage the stack through the Tape Monitor. For everything else I turn the Tape Monitor off. The nice thing about the stack being separate is that I can doodle with recording and use headphones while the TV/DVD/Blu-Ray do something else.

Posted on Apr 24, 2009

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Sansui 8900 zdb to connect to pioneer rg2 dynamic processer then to bose 901 active equallizer. what is the proper method to connect these?


Referring to the picture and remembering that ONLY 901's can run off of any particular amplifier.

http://vintageelectronics.betamaxcollectors.com/sansuistereoreceivermodel8900zdb.html

I can't make out the label for tape copying. You want the 901 EQ to be the "TO" when 'copy' is selected. That way it's EQ will not affect your taping to the upstream deck or processor. Or in your case, you want the RG-1 to proceess the audio first, not after the 901 EQ changes it.

http://www.classicaudio.com/forsale/pio/RG1.html

In to Outs. Both the RG-1 and the 901 Active EQ have facilities for attaching other processors or tape deck(s) within their tape loops. In a pinch you could daisy-chain the RG-1 in front of the Bose 901 EQ on a single tape loop to free up the other one.

Go to Bose.com for the manual and specific pictures of the hook-up.

Sep 05, 2011 | Audio Players & Recorders

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AVR 1600 receiver won't connect to bose series III EQ


You mean BOSE 901 Series III Active Equalizer; and HARMAN KARDON AVR1600 right?

Sure it will. It goes in a Tape Loop such as Tape Out/In or Video 1 Out/In. But it won't work for anything except analog stereo sound sources as all digital audio is not available to the RECORD OUT jacks when the Tape or Video 1 is activated. AND 901 Active EQ is intended solely for 901's, not any other speaker system

The HK has no Line Level volume-controlled Pre-Outs so you're out of luck if you want the 901's to take part in a multichannel setup, which would require a separate power amp to drive them anyway.

Aug 23, 2011 | Audio Players & Recorders

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I have been using 901 speakers and eq with onkyo tx-8522 av. but now when i turn on tape 2 monitor on, the sound become very weak, even i turn the volume to the max. when i turn off tape 2, the sound come...


Qualifier: I have 901's in a 7.1 setup and have written many posts on Fixya regarding how to do it right.

NEVER USE MAXIMUM VOLUME FOR ANY PURPOSE UNLESS THE RISK OF ACCIDENTAL SPEAKER DESTRUCTION IS A ACCEPTABLE.

ONLY now it does that? "VERY WEAK" as in attentuated somewhat or is it signal leakage, effectively silence? How is the EQ wired in? Check its own Tape Monitor button.

If you DO NOT have a separate amplifier for the 901's the EQ will affect EVERY speaker and we know that is NOT desired.

If the EQ is in a Tape Loop of a modern AVR and you activate the loop two things will happen: 1) the 901's will sound better and the rest of the speakers will be at risk from excessive amplitude at the extremes; 2) any digital source will be disabled.

Jul 10, 2011 | Bose 901 VI Main / Stereo Speaker

1 Answer

I cannot connect my bose 901 series v1 active equalizer to my denon av surround receiver avr-891


Short answer from personal experience.

There is no way around this part. Get a separate power amp for the 901's if you want to use them in a multichannel way or alongside non-901 speakers.

The reason: You can't use the Active EQ (or ANY processor) in a tape Monitor loop with anything but 2-channel stereo material. As soon as you activate the loop you lose digital sources.

Adding to YOUR particular problem is that the Denon doesn't have a volume-controlled pre-out to feed that amp. If you want to deal with controlling the separate amp volume manually you COULD connect the Active EQ between DVR Out and the 901 amp IN but you would have a stereo mixdown instead of true front channel from the speakers.

Bummer.

Dec 26, 2010 | Bose 901 VI Main / Stereo Speaker

1 Answer

Need to connect Bose 901 + JBL TL260 to HK3490 and swap for classical / rock..


For analog stereo sources, place the Active EQ in a Tape Loop and only select that loop when your'e using the 901's. If you use a digital source and activate a Tape Loop you will kill the source.

If you have a sub, WATCH OUT as the EQ WILL AFFECT its pre-out.

The best solution would be to get a separate amp for tthe 901's and, using Y-cables, share the Pre-Out-Main In with the Active EQ, which would feed the new amp. That would give you HK-controlled volume for the 901's. This eliminates any undesirable Active EQ getting back into the receiver to affect the sub or JBL's..

Nov 11, 2010 | Bose 901 VI Main / Stereo Speaker

1 Answer

Pioneer vsx 1020 K receiver. I connected the bose 901 eq to the tape in and tape out but it doesn.t seem to be compatible.


It would be compatible if you ONLY listened to stereo ANALOG sources on ONLY Bose 901's. Engaging any device in a tape loop automatically disconnects digital sources. Bose Active EQ is not intended for anything BUT Bose 901's. The sub could be destroyed by it.

Lacking appropriate Front Left and Right volume-controllable pre-outs on the 1020k, you can't use the 901's for multichannel or digital source material unless you accept a severe compromise and get a separate amp for the 901's borrow mixed-down stereo from the Pioneer's Tape Out, run it through the Active EQ to the new amp and manually manage the external amp's volume.

You need Front Pre-outs.

Jul 20, 2010 | Bose 901 VI Main / Stereo Speaker

1 Answer

I have a pair of bose 901, v1 I have a old pioneer vsx 5300


Not knowing anything about your specific amplifier or if it correctly configured for the 901 Active Eq, the first thing I would say is these are designed for analog stereo sources ONLY and a multichannel digital-capable receiver will NOT work properly with any devcie in a Tape loop.

There is no way around this part. Get a separate power amp for the 901's if you want to use them in a multichannel way or alongside non-901 speakers.


Connect the Active EQ between the pre-outs and the amp input. Run speaker assignment, levels, etc and have fun.

May 14, 2010 | Bose 901 VI Main / Stereo Speaker

1 Answer

Bose 901 no sound


Give a little bit more info about your rig. What amp, how connected (I assume you ARE using the Active EQ in a Tape Monitor loop or between the pre-amp and amp), Both speakers failing, just one? What works? Did it ever work?

Apr 14, 2009 | Bose 901 VI Main / Stereo Speaker

1 Answer

Bose 901 series speakers to Bose 901 Equalizer


There is no direct connection between the 901's and their Active Equalizer. It is designed to be inserted between the source and the DEDICATED amplifier driving the speakers. Typically, this would be in a Tape Monitor loop on a receiver.

Tape Rec/Out to EQ In; EQ Out to Tape Play/In on the receiver. If you have a tape deck(s), it(they) would go into the back of the Bose EQ as if it was the receiver and you would use the Tape and 1/2 buttons for selection.

Or,if you have access to any other point that doesn't use the Tape Monitor, like a Pre Out/Main In jumper set, place the Equalizer there. That way it's always in front of the speakers and doesn't take up the Tape Mon.

Flip in the Tape Monitor and leave it on or the speakers will not receive the essential ACTIVE Equalization they require for proper frequency response. DO NOT place non-901's onto any amp using the Active EQ.

Like any speakers, the 901's will attach to the speaker terminals in the conventional manner.

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901 EQ1915


No. You may think you're doing it with the first solution, but the EQ curves introduced by the Bose Active EQ are extremely steep at the extremes. One could just as easily advise that the RIAA phono EQ curve (look it up) could be simulated through an external EQ, but why would you want to try? The best you would come up with is a ballpark match. Don't we really strive for accuracy?

Bose 901's employ 9 full-range, 4"-diameter drivers in each cabinet, hence there are no tweeters, no woofers and no internal crossovers. You can probably imagine how much EQ it would take to make a full-range driver, with its inherent limited voice coil travel and steep roll-off at the extremes, respond as if it was, say a 12-inch woofer, or a tiny dome super-tweeter.

Every series of Bose 901 that came out had its own specific matched series of Active EQ to compensate electronically for the natural limitations of the individual drivers. I imagine there were a lot of major simlarities from one to the next and that you would not be too far off the mark to mix a Series-IV EQ, for example, with a Series-V speaker pair, but I really doubt you're going to dial in the same curves with a manually adjusted equalizer without some specs as a guide.

Try to find the correct Active EQ on eBay. You’ll be much happier with the results.

Dec 01, 2007 | Bose 901 EQ1915 Home Equalizer

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