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The BOSE active equalizers are excellent and necessary components for the 901 sound system's ability to produce life-like sound. Although many older units are advertised as "working great," one should understand that simply because the unit powers-up does not mean that it will work well. In fact, most of these units (especially pre-Series VI) are more than 30 years old and in some cases have not been operated for years. Consequently, the internal electronics are typically deteriorated, requiring replacement of all the capacitors, possibly the operating amplifiers (Op-Amps) as well as the RCA jacks, which are prone to major deterioration due to oxidation and rust. Therefore, one should be prepared to either perform this work oneself (fire-up that soldering iron!), or pay $100 or more to have the work done professionally (one such service is available here on eBay, and in this writer's experience does outstanding work in repairing and upgrading this equipment). But let the buyer beware, your BOSE 901's are not likely to perform well, and will certainly not perform at their very best, until this overhaul is performed. Read full review
Verified purchase: No
The product worked fine for a few days and one channel became low and started frying on both channels...I don't blame the one who sold it because, it's no way he could've know it would go out I believe...
Verified purchase: Yes | Condition: Pre-owned
Bose 901’s. Amazing sound quality and construction. The ever legendary speaker. Can't say enough about these speakers. "Audiophiles" can't like them, but to own a pair and use them daily is awesome.
Verified purchase: Yes | Condition: Pre-owned
You need this for the Bose 901s to work properly. They sound terrible without it. Get the one that matches your series.
Verified purchase: Yes | Condition: Pre-owned
Great sound
Verified purchase: Yes