MTMWW Rebuild with Visaton KE25SC and GR M-130x mids

Thumbnail for Rebuilt MTMWW - The GR MTMWW undergoing rebuild, much deeper 45 degree chamfer cut on front baffle, lots of new veneer and finishing work ... but of course the whole point is the upgrades to M-130x XBL midwoofers and Visaton KE25SC ceramic tweeter. Now that everything is mounted on the baffle, I'll measure them and use these to model my first crossover attempt. Bottom two woofers will remain GR M-165x, but more volume is added to the cabinet so that I can port it.
Thumbnail for Impedance sweep of 2 M-130x in parallel - Tough load, but my 1000ASP powered amps shouldn't have a problem with it. The slight wiggle at 1900hz shows on the M-130 and M-165x drivers as well and corresponds with FR and distortion irregularities on all drivers. Danny at GR Research should look into that issue more. High Fs shown in this sweep due to being loaded in a .3cu/ft sealed cabinet.
Thumbnail for Visaton KE25SC distortion sweep - Measured distortion of the Visaton KE25SC ceramic dome tweeter, nice performance.
Thumbnail for Distortion of 2 M-130x in parallel - I don't exactly know the relavence of testing distortion of both drivers at the same time, but it should be applicable still. Drivers were wired in parallel and inside cabinet. Honestly, distortion is somewhat higher than I was expecting.
Thumbnail for Measured FR, mids and tweeter - Measured response at same distance and volume, they match up quite nicely as is ... should make for an easy crossover design.
Thumbnail for 2 Component test crossover - After seeing how well the measured responses match up, I tried a simple 2 component crossover - a .33mH on the mids and a 9.2uF on the tweeter - this is the measured repsonse. Listening shows promise, the tweeter need a db or two of padding, but other than that it sounds excellent.
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