Krell Bass Alignment Filter for Bowers & Wilkins Matrix 800 Series Speakers - RARE


Super rare and desirable bass alignment filter, specially made for the 800 Matrix series speaker from Bowers & Wilkins.

AND you purchase includes the original 1991 B&W owner's manual AND original box!

Internal switches let you select from *all* the B&W matrix speakers - including the 800, 801, 802, 803, 804, and 805.

Tested and working perfectly which is no surprise considering the quality of the internal components we spotted.

Cosmetics are almost perfect.

Serial # 56-10048

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects

Kimber Kable - XLR Interconnects

Kimber Kable - Power Cords

The SkyFi Testing Process for Preamplifiers/Equalizers:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage. Special attention is paid to the power supply which is the most common source of failure for preamps. We then power up the unit and run a simple 1k sine wave while monitoring the low voltage output on an oscilloscope for signs of distortion or noise to get a baseline.

At this point we will lubricate and clean all switches and potentiometers (that are not sealed) with a high quality contact cleaner, and then re-test all functions for any signs of noise or scratching.

Final testing involves putting actual music through the preamplifier/equalizer. We have learned over time that some issues are only noticeable to a trained ear while listening to a familiar source material. Our test bench has reference vintage KEF speakers that we are super familiar with which will quickly reveal any discrepancies. Some preamps will then move into the listening room where they will be tested with our in-house reference system.



Original Box

Yes As Pictured


Yes As Pictured


Not Applicable


Yes - Power Only

Physical Condition


Working Condition


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