Tag Archives: Active Equalizer

Bose® 901 Series IV Active Equalizer #501554 Overhaul and Upgrade

Posted on January 20, 2016 by jwk

From the Rain City Audio Repair Blog: This Bose® 901 Series IV Active Equalizer, serial #501554, came into the shop with the owner reporting that it loses output on one channel and the sound degrades the longer it is powered … Continue reading →

Posted in Audio, Bose, Electronics, Projects | Tagged , , , | 1 Comment

Bose® 901 Series IV Active Equalizer #219533 Overhaul

Posted on January 2, 2016 by jwk

From the Rain City Audio Repair Blog: This Bose® 901 Series IV Active Equalizer, serial #219533, came through the shop for an overhaul. The owner was reporting the left channel went out, so it’s clearly time for an overhaul! A … Continue reading →

Posted in Audio, Bose, Electronics, Projects, Vintage | Tagged , , , | Leave a comment

Bose® 901 Series IV Active Equalizer #269557 Repaired

Posted on December 10, 2015 by jwk

From the Rain City Audio Repair Blog: Another Bose® 901 Series IV Active Equalizer came in through the shop for an overhaul recently. This one was a bit unusual, and represents a fairly significant deviation from the published service manual. … Continue reading →

Posted in Audio, Bose, Electronics, Projects | Tagged , , , | Leave a comment

Bose® 901 Series IV Active Equalizer #221114 Repaired

Posted on December 3, 2015 by jwk

From the Rain City Audio Repair Blog: Another Bose® 901 Series IV Active Equalizer came through the shop, this one serial #221114. It’s owner reported that it had lost one channel, so it was clearly due for an overhaul. It … Continue reading →

Posted in Audio, Bose, Electronics, Projects, Vintage | Tagged , , , , , , , | Leave a comment

Bose® 402E Active Equalizer #102853 Repaired

Posted on November 30, 2015 by jwk

From the Rain City Audio Repair Blog: The first Bose® 402E Active Equalizer, for the Panaray speaker system, just came through the Rain City Audio repair bench. It’s a small speaker array system, designed around similar drivers in the 901, … Continue reading →

Posted in Audio, Bose, Electronics, Projects | Tagged , , , , , , , , | 7 Comments

Bose® 901 Series I Active Equalizer #51616 Repaired

Posted on November 23, 2015 by jwk

From the Rain City Audio Repair Blog: Another Bose® 901 Series I Active Equalizer came through the shop for an overhaul! This one was from the very end of the Series I production run, serial #51616. This one appeared to … Continue reading →

Posted in Audio, Bose, Electronics, Projects, Vintage | Tagged , , | Leave a comment

Bose® 901 Series II #101043 Repaired

Posted on August 4, 2015 by jwk

Cross-posted from the Rain City Audio repair blog: Another Bose® 901 Series II Active Equalizer came into the shop recently for a full overhaul. These equalizers are getting pretty old and even if they power up and pass some sound, … Continue reading →

Posted in Audio, Bose, Electronics, Projects, Vintage | Tagged , , , | 3 Comments

Bose® 901 Series II #102678 Restoration

Posted on July 18, 2015 by jwk

Cross-posted from the Rain City Audio Repair Blog: Another Bose® Active Equalizer came through the shop, this one’s a Series II. The owner reported that one channel had failed and the switches were badly gummed up. Time for a rebuild! … Continue reading →

Posted in Audio, Bose, Electronics, Hi-Fi, Projects, Vintage | Tagged , , , , | Leave a comment

Bose® 901 Series VI Active Equalizer #179043 Repair

Posted on June 29, 2015 by jwk

Cross-posted from the Rain City Audio Repair Blog: Series VI Active Equalizers are the newest of the set and is on it’s second revision of production even today. Even still, the earliest ones are from the 1990s, and that’s getting … Continue reading →

Posted in Audio, Bose, Projects | Tagged , , , | Leave a comment

Bose® 901 Series V Active Equalizer #130806 Repaired

Posted on June 24, 2015 by jwk

Cross-posted from the Rain City Audio Repair Blog: More and more, even the newer generation Bose® Active Equalizers are showing signs of age. Series V and VI have been making appearances here and there, but seem to have picked up quite … Continue reading →

Posted in Audio, Bose, Electronics, Projects | Tagged , , , | Leave a comment