I've heard both but not in the same system. They are both excellent amps and in many ways very comparable. I believe the Pass to be slightly more rich in the midrange however the KWA150SE is much less expensive. If you need more power running the MW as monos x 2 is less still expensive and also runs the first few watts in pure class A mode as well. As I'm sure everyone here knows I'm a huge fan of ModWright and believe they produce phenomenal products. I don't think you could go wrong either way.
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McIntosh MC501s, XRT29s, XR27, WS350s
ModWright LS 300 Preamplifier
Denon AVR-A100 HT Receiver
JL Audio F113 subs with CR-1 Crossover
Schiit Audio Yggdrasil DAC (Analog 2 + Unison USB)
Sonore Ultrarendu with Uptone Audio LPS-1.2
Uptone Audio EtherREGEN network switch with LPS-1.2
Oppo UDP-205 with ModWright Signature Truth Tube Modifications
Clearaudio Performance SE TT with Hana ML MC cartridge
ModWright PH 9.0x Phono Stage
ASC & RealTraps Panels; APS PurePower 2000; Daedalus Audio DiDs
LAT International, Shunyata, Wireworld, WyWires Cables
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