For sale is this amazing Glockenklang Double 2x12 bass cabinet, a bit of a rarity over here in the US, but these fine German made boxes are held in high esteem in Europe.
To echo the few reviews and forum posts I've found about this cab, they're considered top of the line, hi-fi, detailed sounding bass cabs. I think it sounds great, having used it for indie rock, Doom metal, a cover band, running synths through it, etc.
8 ohms, 500 watts. You know 12s are the best bass speaker, so get some! Needs a Neutrik cable which I'll include if you don't have one.
