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Title: So far, so good.
Review: I use these with my Yamaha DGX 620 Portable Grand and found a depth and richness of sound that I was not getting with the built in speakers. Bass tones in particular are richer, and treble tones more lively. Next upgrade is to get comparable sound in an external speaker system.I've lengthened the head band so that it does not rest firmly on my head, and find that the earpieces are comfortable for extended playing sessions.I went for the higher end product based product reviews and so far am quite satified with my choice.
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