MM2 is not the current model i believe they call it Gen 5. MM2 was right before it. I have the Reference mm2 speaker cables and the Reference XL in MM2 XLRs. The Reference mm2 and higher are calibrated for the equipment they are attached to and this does make them sound better. The MM2 was is better than the previous models. The Gen. 5 are supposed to better the MM2. Other than listening to the Gen. 5 cables at the audio shows for a couple of minutes. It would hard to say what the differences is. If you contract Transparent Cable they will tell you what they feel is the difference and what level match up compared to the older cables. Good luck
Pete
Pete