I think there may be a small JBL that looks like that, but the badge is clearly not JBL. So maybe the Aztec suggestion makes sense, but the very blurry badge seems to suggest a circular or spiral logo, and I don't know what Aztec used - my memory of them is very dim (there was a stereo store in Tarrytown NY for a very short while in the 70s, and they sold Aztecs, but I didn't pay much attention).
For what it's worth, and I suspect it is nothing, my first thought was Stephens TruSonic.