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Up firing PJB Double Four

Discussion in 'Amps, Mics & Pickups [DB]' started by madbanjoman, Nov 19, 2017.

  1. madbanjoman


    Feb 23, 2011
    6AAF2D5E-22F4-4082-9AD5-D2717652EC64. image. After reading about the new Upshot speaker cabinet from AI in another thread, I got to thinking of trying this out with my PJB Double Four. At first I used a couple of books to put a little space between the passive rear speaker and the floor without blocking it. I liked what I was hearing. The sound was more focused and I wasn’t reaching for my HPF pre to tame the lows. I happened to have a spare set of 1/2 thick amp feet, so I installed them on the back of the amp. While I love this amp, prior to making this change I felt wasn’t loud enough for my outdoor street gigs. Now I have been using it exclusively completely happy with the volume and sound.

    I wanted to pass this on to any PJB Double Four owners as possible modification.

    Of course I have added pics for proof

    You can hear it in action with my EUB in this youtube video.

    porterbass, Earl and rickwolff like this.
  2. Earl

    Earl Supporting Member

    I have also tried this with my double four and it works well in some rooms, in others though the bass radiator facing the floor can make it too boomy.