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22209


Date: April 15, 2002 at 16:42:38
From: Petar, [squid2.latrobe.edu.au]
Subject: I need help integrating an old Bose Acoustimass sub into my new system


I recently aquired a BOSE Acoustimass bass module. It has two ports, and I looked inside through them. It looks like a 6th order bandpass configuration. The problem is that the audio input connection is a 5 pin DIN line input, I've never seen a connection like this before. I think it's a line input rather than a speaker input, and I was hoping to use the RCA sub out from my amp. I want to integrate it into my Dolby Digital system. Does anyone out there have any ideas??? I'd appreciate some help if anyone out there is willing. The proper name (read off the back of the module) is "BOSE Acoustimass powered SPKR system, MODEL 2683-1". My email is subbies_rock@hotmail.com. PLEASE HELP!


Responses:
[22216] [46223] [46226] [46925]


22216


Date: April 16, 2002 at 00:41:18
From: Jon, [gatekeeper.trltech.co.uk]
Subject: Re: I need help integrating an old Bose Acoustimass sub into my...

URL: http:\\freespace.virgin.net\j.morgan


Try this, most older stereo equipment used this configuration.

Pin 1 Input left
Pin 4 Input right
Pin 2 Ground
Pin 3 Output left
Pin 5 Output right

If it wants mono then try this:

Pin 1 Signal, positiv
Pin 4 n.c.
Pin 2 Ground
Pin 3 Signal, negativ
Pin 5 n.c.

Jon.

The following link has more information:

http://www.bnoack.com/data/DINconnector.html


Responses:
[46223] [46226] [46925]


46223


Date: April 15, 2009 at 19:08:20
From: Rod, [ppp160d.dsl.pacific.net.au]
Subject: Re: I need help integrating an old Bose Acoustimass sub into my...


I have just done a major repair on one of these... Looking at the face of the connector reading anti-clockwise... Left-HF, Right-HF, Bass, Earth, and the last pin is some sort of control, and does not seem to be important to the sub-woofer amp system.
I had a lot of trouble with this unit... They used securing glug on many components - it goes dark and when that happens it goes conductive. It all has to be carefully scraped away - quite a job - but worth the effort in the end.
On top of that there was a board leakage problem around the 400 group components and I had to lift a couple of wires away from the PCB and solder them directly to avoid leakage around a -32Volt line in the shutdown protection circuit area - it was very sensitive to humidity... Have fun but take care - this is an exposed power area. - Rod
Moderated By: brian@diysubwoofers.org


Responses:
[46226] [46925]


46226


Date: April 16, 2009 at 16:42:42
From: Don, [desktop-gw.nil.net.nz]
Subject: Re: I need help integrating an old Bose Acoustimass sub into my...


I had similar electrical problems with an Acoustimass unit. The protection / switching circuit uses 4 transistors, one per amp (the bass driver uses a bridged amp circuit). They are all driven by one "master" transistor. Trouble is, the protection transistors are referenced to one supply rail, and the master transistor is connected between their bases and the other supply rail, with no "pull down" resistor. So the slightest leakage in the master switching transistor, or leakage on the PCB, causes the protection transistors to start to conduct. And if they only turn partly on, they upset the DC conditions in the power amps and cause a fuse to blow. I ended up putting a 470K ohm resistor between the common driving point and the supply rail to "drain away" any slight leakage.

I use it as a second system in my study. I ignored the Bose system connector and used the RCA inputs. It drives a couple of Sanyo SX80 bookshelf speakers off a very old mini-system. They have a 4 inch woofer and soft dome tweeter, and a "proper" crossover, and sound excellent, just bass shy. They're more sensitive than the Bose cubes, so one day I must get around to fitting a level control in the Acoustimass amplifier to balance the level between the bass and the fullrange.
And as for the glue, I've done battle with it many times. As well as going conductive, it goes corrosive and can eat right through PCB tracks and component leads.
Moderated By: brian@diysubwoofers.org


Responses:
[46925]


46925


Date: October 30, 2017 at 18:36:34
From: Giovanni, [5.170.223.25]
Subject: Re: I need help integrating an old Bose Acoustimass sub into my...


Hi Brian I have same problem with this Bose. You can send me the
circuit modified with 470k resistor ?
Thank you
Moderated By: brian@diysubwoofers.org


Responses:
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