Linkwitz Mini Dipole Prototype Speakers (PMT1)

High-end sound on a low-end budget!

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Routing the woofer hole with a circle jig. (76kb) Front of baffle. Note chamfering. (86kb) Rear of baffle. The woofer fits in the recess, padded with foam weatherstrip tape. It is not screwed to the baffle; it is held in place only by pressure from the rear brace. This reduces cabinet resonances according to Linkwitz. (85kb) Testing the pieces for fit before assembly. (65kb) You can never have too many clamps! (93kb)
Inside surface of rear brace. Note foam tape to press against woofer magnet, and the 3.3mH steel core inductor for the crossover. The rest of the crossover is mounted on the outside of the brace. (99kb) Cabinet ready for painting (72kb) Rear of completed speaker. Mesh is plastic gutter screening. (87kb) View of the equalization circuit to correct for dipole bass roll-off. It goes between the pre-amp and power amp. (76kb) Completed speakers with system. Yep, that's old Dynaco gear back there! I'm not into vintage gear - just cheap! (165kb)
Single speaker. The fish makes the midrange more liquid ;-{)} (168kb) The room I'm working with (or against). A slightly digaonal placement gave me the most even bass response. The small desk is used for fly tying and small electronics assembly. (10kb) Pink noise test. Pink noise is less useful for testing bass response. I used the DIY tes mic detailed on Linkwitz' site, with a cheap mic preamp kit from Parts Express. (68kb)