I bought these after reading reports that they were useful.
To be honest I hardly ever use them, they are very well built, look smart, but for the amount of time I use them, I wish I had not bothered!
I use them occasionally for checking for any strange frequencies, and just to give my ears a break from the main monitors.
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Changed my mind about these, I am using them more often all the time, great for checking vocals, bass gtr/kick drum in mono, though I do use them in stereo also, just for reference, though I really think just ONE in mono is best,