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Andy Lewis' flat-response extended-range "Low B" line of 3-way bass speakers. Direct sales.

Huge archive of bass-related user reviews including preamps, power amps, amp heads, speaker cabinets, combo amps, and effects.

Len Moskowitz' famous compact bass cab plans. Gonzo sound for the do-it-yourselfer.

Site from luthier Dana Sutcliffe offers a guide to match Ampeg amps and speakers correctly, as well as downloadable Ampeg manuals.

Audio projects including amps and preamps suitable for musical instruments amps, effects, and some neat subwoofer/processor plans for bassists.

Design and hand-build tube amplifiers; includes model speficications and dealer network. Also offer a custom-build service.

Large database of guitar and bass amplifier and speaker user reviews.

Collector and restorer of old valve guitar amplifiers describes his collection.