Conclusion: This amp is ideal for intalations whereby space is an issue or can not be compromised. With this amp I replaced an old alpine Amp that was also in the class of small powerful amps. I made a switch and noticed and inmense difference. It was so intense, that I had to dynamat the car panels. I was powering a JL w3 12" on a sealed enclosure and the sound was incredible. The bass was clean and deep- for its size unparalleled. This lasted about 8 months.
Conclusion: Very good unit in my opinion. I'm not a SPL guy, so I'm not sure what "cold" means. I previously owned a RF Power T500-1bd. It was a good sounding unit, but this amp sounds just as good in my opinion. Plus, JL Audio includes detents on all their adjustments, which surpasses any RF amp I've ever used as far as tunablity goes. Long story short, both amps are good, but if I where to recommend one over the other, I'd take this one. They cost about the same.