LesE

The Allison Four woofer is actually 4 ohms impedance. In the model Four, there is a 2.2 ohm resistor and an inductor in series with the woofer which raises the impedance to 8 ohms. Here are the specs for the Allison woofers. The model Four woofer appears to be unique but the LC110 or LC120 woofer may be a fairly good replacement. If one could be obtained at a reasonable price, it may be worth a try. Allison Driver Specifications

Hey Bill, I must have grabbed this from the Allison group at some point. Most likely from the old Yahoo site. I pop into the new groups.io every now and then just to find out what those guys are up to. That platform seems to work for them and that's cool but I agree that modern forums such as CSP are a more effective and convenient way to communicate. Cheers, Les.

I happen to have a copy.

FYI ... When it comes to refoaming Allison woofers, the filled fillet type surround is generally recommended. Les.