Im using Soliloquy 5.3s with my Atmasphere S30. I understand Silverline Audio are also very OTL friendly. Emil
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I'd ask Ralph Karsten himself: [email protected] I'm using his M60 II's with Quad ESL's, and they're great: loud enough with half the output tubes removed. Look out for low impedance speakers. But those amps are worth some attention to speaker selection: with suitable speakers, they sing.