A friend of mine used to have 3.6's and now he has 7.0's. He bought a 331.5 it was by far the best amp he tried with the 3.6's. Then he bought a FPB-200 and loved it. He sold the 331.5 and purchased a 334. He had a really hard time deciding between the 2 amps (lucky bastard if only I could afford to have both...lol). He ended up selling the Krell and still has the 334. Overall he thought it was more true to the source. To be honest I don't think you could go wrong with either. From what I have heard in his system the Krell seemed to have a touch more air or 3D sound and was very smooth. It had great midbass punch where the 334 had better lower bass drive. The Levinson just did everything well. You can't go wrong with either one because I borrowed both of them and could live with either. The only negative I have heard on ML is the cap issues. The Krell 300's may be a nice step up but I have never heard one. Do some research here and audioreview.com. That might help.
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