"Glen,
Thanks for your expert opinion! Knowing that objects transfer low energy better than air, I was afraid of that. I guess I rationalized the 1 1/2" + 1 1/2" (3") would not be as much of a factor, but that was a guess at best!"
No problem.
It is not like you totally messed them up. They will work ok for a DYI project.
"Great link, isn't it? My $29 cost was including shipping, fabric, lumber and an open back design. The ATS at 48x24x4, open back and shipped at $69 are still a steal!
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I would like to see some true lab numbers on that before I would say the same.
Glenn