Question about Bose 901 VI Main / Stereo Speaker

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Bose 901 speakers the wiring inside

I would like to know how the nine speakers in a bose 901 ser2  speaker are wired up inside. from what I had found out so far the drivers in the ser 1 and ser 2 were 8ohm now with nine drivers to hook up in each speaker if they were all hooked up plus to plus neg to neg it would be a reactive loadand all plus to neg well your load would be very large indeed. So how did they do it without blowing up amps? something else if they used a combonation of the two to fix the load would this not lead to one driver killing the bass of the one beside it (out of phase)?  please if you can help with this thanks.
yours Jack G.

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Re: bose 901 speakers the wiring inside

- Bose 901 Series I and II speakers have 8 Ohm impedance each.
- A row of 3 speakers in series gives you 24 Ohm.
- 3 parallel rows gives you finally 8 Ohm.

Front with 8 speakers (view from the rear):
(1) (3) (5) (7)
(2) (4) (6) (8)

Rear speaker is number (9)

Row 1: -(1)+ -(3)+ -(7)+
Row 2: -(5)+ -(9)+ -(2)+
Row 3: -(8)+ -(6)+ -(4)+

Posted on Jan 12, 2008

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Re: bose 901 speakers the wiring inside

The Active Equalizer uses standard garden variety stereo RCA cables.

Posted on Apr 13, 2009

Re: bose 901 speakers the wiring inside

I have a pair of the 901 and the active equalizer but they have been in the closet for 6 years. I tried hooking them up without the equalizer and they did not sound good at all. I need to find a set of wires for the equalizer. Is this a special order or should Radio Shack carry them? Also how much would it cost to get the pair refoamed?

any help is appriciated.

Posted on Jul 08, 2008

Re: bose 901 speakers the wiring inside

If I remember correctly, the 9 X 4.5" drivers (for each speaker) are 0.9 ohms each impedance. They are wired in series, thereby achieving an 8.1 ohm impedance per load speaker (9 * 0.9 = 8.1). The active equalizer for the speakers produces a response curve necessary for reproduction of rich bass and high which deteriorates due to the combination of full range drivers wired in series. Larger amps ( > 60WPC) are usually necessary for Series one and two pairs to reproduce better bass. I don't recommend anything after the series 2, as the sound just seemed to get progressivly worse to increase efficiency, so that smaller amps would be needed. Just get yourself a nice HK 2-channel receiver, and your series 2's will sound alright so long as your room is *perfect* for sound reflection, and your speaker surrounds (cloth in the series 2) are in good shape.

Posted on Jan 06, 2008

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Bose 901s series 1-6 are all wired in the same way. that is nine one ohm full range drivers wired in series to produce around 8 or 9 ohms. No way it can be a short, think of the old christmas lights that were wired in series , one light went out, they all went out. I would check the wiring first to make sure no loose connections exist. The only way to access the wiring is to remove each driver from the cabinet. If all wires are intact, You may have a damaged driver. A simple test with a ohm meter will tell you. set to lowest ohm setting, each driver should read 1 ohm. If your speakers dont have the air tubes in back, you have series1 or 2 removing the drivers will not affect the vaccum, just replace the gasket material around the drivers.

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