Zapco ST-BR リモートレベルコントロール Studio Series アンプ用 ST-5B ST-1B

The solid housing feels sturdy enough to survive years of daily driving, and the knob turns with a satisfying click at each detent. Mounting under the dash was straightforward since the wiring is clean and the fit is tight. It does exactly what it's supposed to do for my ST-5B, no fuss.

I installed this under the dash and it pairs perfectly with my ST-5B, the knob has a nice smooth feel when adjusting volume. Makes it easy to tweak levels from the driver's seat without reaching for the amp.

The solid housing feels way sturdier than the flimsy plastic knob I had before, and it tucks neatly under the dash without rattling. Being able to tweak the bass from the driver's seat instead of reaching for the amp is exactly what I wanted.