diyAudio - Entries for July 2014
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I've been gathering bits for this project for a while, and started cutting this weekend.
Sats will have three each AMT tweeters in a vertical convex line array above the main cabinet.
The main cabinet is to be a heavily braced .70 cubic foot, made of 5/8" MDF side, top, and bottom panels, the baffles to be made of 3/4 MDF, the front with an outer layer of 18mm Baltic birch.
Full width braces will provide magnet bracing to vertically stacked, front mounted 6 1/2" Dynavox midwoofers.
Past experience with these tells me they have a slight midbass hump, but otherwise sound good unfiltered .
To highpass them, maintain near neutral cabinet internal pressure, and direct couple the woofer I'll hear to the amp, I will be wiring these out of phase in parallel, the lower woofer with a 4.7mH , .83 ohm inductor in series.
This should give my cabinets about 9db of relief from pressures at @ 60hz, and a mechanical high pass -3 db phase cancelling point at 120 hz.
I'm hoping that two motors removing low bass internal pressure will nearly eliminate resonances coming through the woofer cones.
And yes, this design was inspired by M&K S1C pairings.
I do still have seven of those 5 1/4" peerless M&K woofers , but have to save them in case some one gets foolish with some speakers I've sold in the past. My opinion is the Dynavox speakers are better in every way for this use.
The sub will be a push pull using two Dayton audio reference 10" drivers, in a sealed transmission line enclosure for now, but will be building a smaller sealed enclosure later.
These fed from a Yung 500 watt plate amp already owned.
My biggest concern is making an anachronism.
Looking around, I don't see high quality sub sat combos around any more.
Is this absence because the sub sat is a fatally flawed species?
I've always thought a great small cabinet is easier to build than a good large cabinet, but am worried my memory may be enhancing the quality of the old S1C MX-2000 combo I enjoyed long ago.
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