Resurrecting this thread.. cause the iM590s deserve it!
Like some others iM590 owners, I had channel imbalance issue with my original pair (the sound was slanted/louder toward the left channel than the right).. Maximo's excellent customer support promptly replaced mine after they determined it was a faulty pair.
For all the praise the iM590s received for being a natural, superbly-balanced phone, they sounded a bit too warm & bassy to my ears as they muffled the upper midrange and treble frequencies enough to be noticeable. I had been using the medium-sized tips since my original pair & I always felt they fit perfectly.
After receiving my replacement, I began experimenting with the tips again and decided to throw on the smaller tips.. and whammo.. Hello BALANCE! Even after burning them in for 50 hours or so, these IEMs sounded a little too forward for me with the medium tips.. using the smaller tips, the sound dramatically improved. The overwhelming warmth settled down perfectly (without losing any definition or clarity, improving in fact) while simultaneously balancing with the lush mids and revealing more detail to the smooth upper frequencies.. all which created a lovely, hypnotizing presentation.
The smaller tips allowed for a deeper insertion creating a better seal by the second flange (which covers part of the metal housing). Perhaps I never got the correct insertion with the smaller tips so I hastily skipped over using them? But hot damn, after giving them another go and getting a deeper set in my ear canal.. these IEMs have become down-right addictive. I can finally say I fully understand the praise these get for their incredibly pleasing, natural sound. It's well deserved.
So, in conclusion, if you find these on the excessively warm side (particularly when connected to an iPhone 3GS, which has a slightly mid-forward output), try to go for a deeper insertion.. you might just surprise yourself like I did! I noticed I experienced the opposite effect of the original poster in this thread, who had to go to a larger tip to get the desired sound.. to each his own, of course.. but once you get the right fit, these can truly be a great set of phones.
I have found the perfect assortment of IEMs for my taste and my search for thehas (for my wallet, thankfully) ended. The iM590s provide the perfect bridge between my freakishly-detailed DBAs and the cozy-warmth of the Silver Bullets. From a comfort standpoint, the iM590s are so easy to insert, stay in place without any problems, feel so comfortable, and provide a perfect level of isolation.
Color me impressed! Great job, Maximo!
Edited by FlySweep - 12/20/10 at 6:02pm