In the end it's what sounds best to you. But having owned two Sim I-5s, (yes I had sellers remorse and had to try again) I used the I-5 to drive a pair of Hales Rev 3s and was very satisfied. While I heard the Krell 400 far less than the 300, I can say that the 70 watt Sim seemed to have more authority that the 300 krell. But that's just one guys opinion. Happy Listening.
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