Your post reminded me that i needed another absorption panel behind my listening position having damaged the previous. Although i've done business with GKI, instead i ordered this one from ATS, yesterday. It shipped today !! I haven't done business with them yet so we'll see about quality etc when i get it. Cheaper than GKI for a 4" thick 2'x4' panel.
GIK alternatives
Last month, an audiophile colleague inquired about GIK acoustics on this forum. I shared my experiences as a longtime customer. I pointed out episodic challenges with build quality but a highly responsive staff. I have changed my impression and would not recommend them. GIK has recently changed CEO and several longtime colleagues appear to have left. Their prices have increased, especially for shipping. I’ve been attempting to place an order by phone without success. And their product lead time is extraordinary. For example, I was informed that routine scatter plates would not be shipped out for 2 months. They’re having problems. Any recommendations for alternative companies?