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RE: Move??

You want the frame to make contact with the transducer, not have a death grip on it. :) The thickness of the spacer can vary depending on what material you utilize. Obviously, if it's too thick you can't create any squeeze. You would need to find a thinner material and then fine-tune. On my prototype unit (different spacer material) I used a layer of tape to create an additional 0.006" less squeeze.

Also, the paint job on the mylar side of the transducer creates some unevenness which I smoothed with sandpaper. I then checked the thickness of the transducers at various points with my verniers. There is some variation, but it's not too much.

Once installed, if you grab a hold of one of the transducer crosspieces and try to move the transducer within the frame you shouldn't be able to, but, you should almost be able to. Make sense?

The argument against sandwich construction is that wood expansion/contraction will increase/decrease, respectively, the squeeze on the transducer during seasonal changes. I have been monitoring this on my prototype frame unit (which doesn't have a transducer installed) for over a year now and am comfortable this is a minimal factor. (At least where I live.) I believe the trade-off of having even contact on the full surface of both sides of the frame vice the "screwy" alternative is worth it.

They sound wonderful. As you know I use a line-level crossover with companion dipole woofers for a full, active, three-way system. However, I can easily switch off the woofers and run the MMG's "full-range" for material that has limited bass and they sound wonderful that way too.

Cheers,

Dave.

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