For the moment sound of 2 STA-9 in bridged mode I like less than sound of 1 STA-9 in stereo mode.
1. STA-9 in stereo mode was feeded by top Power Cable of NeoTech brand.
For 2 bridged amps I have to use 2 Power Cable (self-made) which are absolutely identical.
2. 1 amp I received only yesterday, condition - "from box".
Of course I can hear difference anyhow. 2 monoblocks have crazy dynamic, more control, I can listen music
on very low volume's level, LF is deeper.