To follow up. Bjorn sent me an updated file to up the bass output. Loaded up the Audison BitDrive software and easily transferred the update to the amp. The result is subtle but noticeable improvement. I've fiddled the BitDrive software a bit further and achieved a slightly better result on top of this. Overall, probably around a 10% improvement.Thanks Bjorn. I've used the native EQ to up the bass but it sounds terrible. I imagine the sound stage is wrecked doing this. I have the Bit Drive software on the lap top but yet to hook up with the system. Yes if you could send that software to push the amp a little more I will try this option ! Many thanks.