I have already on one of these posts, but quickly, the CKM500 is more syrupy in the mids with muddy bass. The mids are blurry. The IM70 has fuller notes (taller and wider) with clarity. The bass quantity is more in the IM70 but clearer and more solid. I believe the IM70 has a wider soundstage, but I would have to AB to make sure of that. But I can without a doubt that the IM70 is the better value.