@lalitk, please let us know your findings. I’ve found that by going up the REL line, the lower frequencies are much more impactful, enveloping and engaging. I started with a pair of S/5 SHO’s, then 212/SE’s and now a pair of No.31’s. The 31’s are actually set at minus level. I think in your case, the Carbon’s will end up outperforming the 99’s. The carbon fiber driver is what makes the sub special.
Happy listening.