You should be able to get very close. I just got the Quatros and have had them in my system for a little over a week. I am coming from stand mounted monitors with a single REL sub. I was curious to hear the difference in the bass between the two built in subs vs the the single REL Comparing the two I find that interestingly enough the REL got it right most of the time and in some cases may have gone a little deeper than the Quatro. That probably has to do with the 10" woofer in the REL vs the two 8" woofers in the Quatro. The biggest advantage to the Quatro is being able to fine tune the bass to the room. While there is probably more versatility with 11 band equalizer on the Quatro to tune the bass, the two separate subs will give you more versatility with regards to placement. If you were starting from scratch I would recommend the Quatro over the Treo but since you already have two high quality subs I suspect that will be a great combination.