I bought a store demo GAG.
Once I got it home, it buzzed on one particular CD. I thought it was the driver. The dealer ordered a new driver from Gershman and I brought the speaker back to the dealer and tested on his machine. Well, the buzz was hardly noticeable. Anyway, the dealer installed a new driver. When I brought it home, the buzz was reduced, but a tiny buzz was still there. Then, I realized the problem was on my part. Then, I upgraded the amp and preamp, and the buzz was completely gone.
My amp/preamp was almost 20 years old (Plinius SA102 and M16P), and once upgraded, Gershman sounds much better.
I guess you can simply order a driver from Gershman if they still have it. Or, you can ask them about replaceable driver.
I also listen loud and dial at around 12 o’clock on preamp volume.