I have an update. The MCX series is one damn fine sounding amp. I bought the MCX-4. Jason is right, just buy it, you won't be disappointed.
There is plenty of slamming, impactful, tuneful bass compared to my IDA-8, STA-9, and IDA-16, and frankly compared to any amp I have had. It has taken control of my Polk Audio LSiM-707's woofers. I don't want to overstep any boundaries here, so I will stick to the OP's question on bass.