I see on the Moon W-5
Amplifier that there is a phase inverted RCA input. Although a phase problem would present in other areas such as a lack of bass. I'm just checking to confirm that you're not using this input.
And according to a review, Simaudio has slightly rolled-off highs and sounds very natural. It may be poor synergy between preamp/amp and speakers.
So, what is your budget for speaker recommendations?
Dynaudio speakers have a very dynamic sound with extended highs. With B&W, I find that the 800 series are vastly superior to the CM speakers. However, with all B&W's you will discover a brighter speaker.
And according to a review, Simaudio has slightly rolled-off highs and sounds very natural. It may be poor synergy between preamp/amp and speakers.
So, what is your budget for speaker recommendations?
Dynaudio speakers have a very dynamic sound with extended highs. With B&W, I find that the 800 series are vastly superior to the CM speakers. However, with all B&W's you will discover a brighter speaker.