Good day to throw a sicky;) New amp has just been delivered, the TacT SDA2175 semi digital power amp, to replace the RB1090 i have been using. Cant realy comment as yet, its been powered up for all of 20 minutes. But stone cold and straight out the box it seems to have better bass grip, and maybe a deeper/wider stage. It is very well built, nice decent thickness to the case, and from the internal pics ive seen very neat inside aswell. I have been told that it will need a week to settle in, so looking promising. Watch this space;)