Tuesday 17 February 2015

EAW MX800

I recently had the pleasure(?) of repairing a somewhat vintage EAW MX800 4-band crossover from the early 90s -






The MX800s are designed to drive rigs based around EAW speakers, and came in a number of configurations depending on what particular EAW speakers you were using. This particular crossover is designed to drive SB850 subbass speakers with KF850EF mid-tops. The latter are enormous tri-amplified brutes that can handle a total of about 1600 watts.

The crossover had blown rather spectacularly during a performance, apparently emitting 50hz at full volume on all 4 channels. As this was during a drum and bass night the crowd reportedly went wild (in a good way) until they figured out that it was unintentional!

Dismantling the unit revealed that the unit had blown its main +15v input regulators (7815 and 7915 respectively) and filter capacitors. Interestingly the filter capacitors seemed to be rated rather low (+-16v for a ~21v transformer output), perhaps as a result of an earlier repair. The PCB tracks under the power section had also burnt slightly so required replacement.

First port of call was to replace the main input capacitors with beefier models, the same capacitance but with a 35v rating :


I also took the opportunity to fix a rather glaring design flaw in the MX800, which is that the input regulators were literally millimeters away from the mains input socket. It seems like a simple knock could result in the heatsinks touching +-240v AC - perhaps this is why the regulators blew in the first place. I decided to move the regulators to the underside of the board, and screw them to a support strut on the underside of the case with much beefier heatsinks to boot :


I used SIL-Pads and nylon screws to avoid ground loops, and epoxied them into place to stop them moving around. The unit powered up perfectly on the first try. A quick sound check with the workshop speakers proved all channels still worked. I have yet to do a burn-in test with the new heatsink configuration, but after 20 minutes of running all 8 outputs the regulators didn't get more than slightly warm.

We will be testing the crossover with the full setup on thursday night.

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