Tag Archives: Bose Active Equalizer

Bose 901 Series II Equalizer #58189 Repair

Posted on June 16, 2014 by jwk

This Bose 901 Series II equalizer came into my shop recently. It had one good channel, but the second channel was experiencing a large amount of distortion. No wonder why, the unit was mostly original, although it had some evidence of being serviced before.

Inside, about half the capacitors…

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Bose 901 Series II Active Equalizer Repair #126500

Posted on June 4, 2014 by jwk

This Bose 901 Series II Active Equalizer came into the shop for a complete overhaul after it suddenly stopped working entirely. While in the shop it also got upgrades to the output capacitors and added 4%-silver solder for the lowest joint resistance possible. After a full rebuild and live listening test it’s ready to go back home and serve faithfully for many years to come.

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Bose 901 Series I Early Production Equalizer #00570 Repair

Posted on May 27, 2014 by jwk

I just finished a new project over at Rain City Audio – Bose 901 Series I Early Production Equalizer #00570 Repair

This Bose® Active Equalizer is the earliest I’ve ever seen through the shop, serial #570. It’s very hand made and got a complete overhaul, including some upgrades to maximize performance. With all new parts to replace the worn out and failed originals after 46 years, it’s going to sound great for a long time to come.



Check it out at http://www.raincityaudio.us/blog/bose-901-series-i-early-production-equalizer-00570-repair! Continue reading →

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Bose Active Equalizer Model 800 #003833 Repair

Posted on May 15, 2014 by jwk

I just finished a new project over at Rain City Audio – Bose Active Equalizer Model 800 #003833 Repair

Those Bose Active Equalizer model 800 is from the early run of the Bose 800 PA system, which is very similar to the Bose 901 direct/reflecting speaker system. The equalizer had bad noise and distortion in both channels when I got it, but after a repair works and sounds perfect and will last for a long time to come.

Check it out at http://www.raincityaudio.us/blog/bose-active-equalizer-model-800-003833-repair! Continue reading →

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