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Edited by Gr33nL34f - 3/28/12 at 3:57pm
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The neutral way that the 840s handle a musical source means that they could be excellent for opera for the following reasons.
They reproduce the human voice very well
They give a natural reproduction of string tone
For closed cans they have good separation and soundstage and here is the caveat. I believe that for the complexities of opera you would be better served with a pair of open back cans. I don't own much opera but I prefer the way that my Sennheiser HD580s let the Verdi Requiem open up as compared to the Shures. For example, I can definitely hear where those off stage trumpets are coming from in the Tuba Mirum with the Senns yet find the Shures a little less distinct.
That said, if you must have closed back phones, I can't think of anything better than the Shures for classical music including choral and vocal works with orchestra.
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The 580s were replaced by the 600s - a very similar sound I've been told and yes, an amp definitely helps. I'm using the Fiio E7/E9 combo and am very happy with the improvement over no amplification. The SRH840s don't really need an amp and my MP3 player drives them with ease. That said, connected at work to my laptop/HRT Music Streamer II/PA2V2 there is a definite improvement. Can you audition the Shures anywhere?
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Good move, getting the MS1's rather than the 840's.
The Shures are pretty good, but I think opera does better with open headphones
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