I'll try to get a video together later today.
Decent driver movement only comes with a lot of power. You need 100 Watts to see any movement. Each of those HP drivers can take 260 or so continuous Watts and over 1000 Watts peak.
Have you read the M5HPOW review on the product page? The reviewer says he's amazed with their bass.
You may be lacking mid-bass. If you have an EQ setting around 70 Hz, boost at that frequency and set the Q to 2.3. That will give you a nice slam between 55 Hz and 85 Hz. If you do that, don't boost above or below 70 Hz because that will negate the mid-bass boost.
If you're happier with that, you may also want to try boosting the 600 with EQ and the rear switch. Experiment with the speakers crossed to the 600 and also playing wide open.
