Okay, I will have to check this when I get home (against the CKS1000), but right off the back I have to say I haven't heard an AT iem with a sound this full! This is FULL!! Wonderful height and weight. And it's fuller than the CKM500, but not as syrupy and muddy as the CKM500 is. Plenty of bass and forward mids. The highs there but don't standout as much as the bass and mids to my ears. But the highs are there and its definitely adding clarity to the sound. These sound fantastic out of the box, but I'm expecting so much more from this BIG sound with burn-in. Strings are very full sound (thus living up to "Symphonic" drivers). I'm listening through the DX50. One minute I'm a JVC fanboy, but AT has really fought hard as of late to make me appreciate its sound in universal IEMs. I couldn't see AT downgrading its sound even if it lowered its prices on some of its new releases. Well, AT doesn't disappoint here. The IM70 shoots above its MSRP.
By the way, the DX50 drives this earphone just fine!