The sound of the original Momentum and the small brother is totally different. I think if you are using Westone 4 , then you will not like the on-ear momentum as it is bass elevated( way more than Beats) and the Over-Ear Momentum is kind of warmer sounding and balanced with Bass emphasize but not too much.
I agree. Way too much bass and mid honk. Now that we have a consistent fit, I thought the sound would be more balanced but no. These SUCK!! What on earth was Sennheiser thinking?