id say 15 to 20% better.
I've owned the 650s, 6XX, 660s and 660S2.
If you're coming from the original hd 660s, the bass sounds more extended. mids sound closer (to me) to the hd 650s. It depends on your wallet, for me, I'm okay with spending $400 for a marginal upgrade.
id say 15 to 20% better.
I've owned the 650s, 6XX, 660s and 660S2.
If you're coming from the original hd 660s, the bass sounds more extended. mids sound closer (to me) to the hd 650s. It depends on your wallet, for me, I'm okay with spending $400 for a marginal upgrade.