I currently have a Hartke 410XL (older model, 260 Watts) and I am upgrading my amp to a GB Shuttle 6.0. I want to pair a 1 12" with this cab to add some low end depth. My choice is between these two cabs to do it. Looking to see which of the cabs adds more lows and low mids. Both cabs are 300 watts 8 ohms so they should combine with the 410 XL into a 4 ohm 560 watt load on the 600 watt amp. Let me know what you guys think. Thanks. Music style varies but is primarily progressive/modern/indy rock.