WA 5i front speakers are driven by the DIY solid state power-amp (tailored made by a local HiFi Master).
WA WATCH centre speaker is powered by Krell KAV-250a (bridged Class A/B 1,000W, there is a switch on the back to select either mono or stereo output).
Elac BS244 surround speakers are powered by the Krell KSA-80B (Class A 80W).
Right now, I am planning to convert the Krell KSA-80B into KMA-160 (Class A 160W) for the WATCH centre speaker
and use the KSA-250a (stereo Class A/B 250W) for the Elac surround speakers.