I think PJB combos are primary intended for double bass. With double bass, you can be only as much loud, because of the feedback. Feedback comes from moving air created by a speaker, which moves the top or bottom desk of the body, then feeds back to the pickup or mic. The smaller area of moving air, the smaller impact of the speaker on the body, which means you can turn your amp more up, resulting in bigger volume to your ears. But, you need to aim the speaker at your ear, not at the bass body. Also, many of us double bass players prefer clear mids and highs above boomy lows, because you need to hear pitches very well to play in tune (and more).
Bass guitar players often like big boomy low end. I think PJB stack can do it too, but it is definitely not the best rig for metal. IMHO it is meant more for everynight pub gigging jazz trio bassist, you would be very happy with how easy it is to travel.
Bass guitar players often like big boomy low end. I think PJB stack can do it too, but it is definitely not the best rig for metal. IMHO it is meant more for everynight pub gigging jazz trio bassist, you would be very happy with how easy it is to travel.