"Yes, but that was a long time ago. They haven't answered any e-mails and, I assume, are disbanded. I hope I'm wrong."
I wouldn't give up just yet. Since their website is still up and running, they may still be alive and well. Hopefully their phone service issues may also be related to why they haven't answered your emails. I'd wait it out through the holidays before throwing in the towel.
From the link kindly posted by Davehrab above:
"NOTICE: Allison Acoustics' Phone System Temporarily Disabled
We would like to apologize for any difficulties our customers may have had in reaching us recently. We are working dilligently to repair the issue and will be back on line soon. During repairs, we may be reached directly via email at david@allisonacoustics.com"