Phil Jones is a professional audio engineer and bass player who has been in business for over 4 decades now. He noticed that traditional bass amplifiers were built on old principles but these were not really effective. Being a world class HiFi speaker designer himself, he started PJB with the intention of applying the same technology and design that was used in that exclusive HiFi speaker world to produce bass amps that would be effective, affordable and reliable.
From the beginning, PJB's most innovative feature was the use of small speakers proving that, if done right, these are far more effective than larger ones. Of course a lot of research went into this and multiple tests were performed to check the beaviour of the speakers, the use of PWM amplifiers and specially designed cabinets.
All PJB amps produce a clear and undistorted sound as well as a very deep and focused low end that is usually hard to belive it comes form such a small amp.
This is the SUITCASE COMPACT BG400 combo and here's the description by PJB themselves:
Phil Jones Bass Suitcase Compact BG400