Hi All, I've got a 1995 JCM 900 Dual Hi-gain, modified with EL34 tubes, rewired the presence,treble,mid and Bass adjustment so it works with a Pre-Amp connected. Also put in a split to work with two end-tubes when required smaller volumes. My problem is still the highs by higher volumes, the amp and 1960A cab sound great with my Rocktron Piranha on lower volumes, but when I crank it, it produces to much high and the bass seems to disapear. Would it be possible and make a difference te replace two original speakers to two bass-speakers? Or change to a complete bass-cap?