Single booster. A function is to raise the sound.

UTILIZATION

Could not be more simple.

SOUND QUALITY

I tried this with my deluxe Jazzbass hiper active and the sound is completely distorted, saturated. Therefore unusable for what I wanted to do. I said that I did this test with my bass.

OVERALL OPINION

I kept one week and did a concert.
Unusable with my active bass. Try before you buy.