I have had the CAT SL1 Ultimate in my system for a few days in the past, and I currently own the same First Sound model as Rayhall (as of his last post): the Presence Deluxe Mk II, 4.0.
I did not have both units at the same time. But, as far as I can tell, Rayhall hit the descriptions of both units dead on. I had a bit of a pre-amp/pwr amp interaction problem with the CAT and my Cary SLAM-100 amplifiers which I chalk up to a very sensitive input section on the SLAM-100s; so, I can't speak as completely about the CAT's characteristics as I can about the First Sound's. But, the CAT's dynamic, low end weight and authority speed, etc., it adds up directly to what I also heard. (The Lamm LL2 is similar in this area.)
So too does Rayhall's description of the mid-range purity of the First Sound and its slightly softer bass extension (in my system). Others have reported great bass extension and speed with First Sound pre-amps, just as Rayhall mentioned.
It comes as a pleasant surprise to read someone else's account of gear I am familiar with so nearly match my own impression when, all too often, just the opposite happens.
I did not have both units at the same time. But, as far as I can tell, Rayhall hit the descriptions of both units dead on. I had a bit of a pre-amp/pwr amp interaction problem with the CAT and my Cary SLAM-100 amplifiers which I chalk up to a very sensitive input section on the SLAM-100s; so, I can't speak as completely about the CAT's characteristics as I can about the First Sound's. But, the CAT's dynamic, low end weight and authority speed, etc., it adds up directly to what I also heard. (The Lamm LL2 is similar in this area.)
So too does Rayhall's description of the mid-range purity of the First Sound and its slightly softer bass extension (in my system). Others have reported great bass extension and speed with First Sound pre-amps, just as Rayhall mentioned.
It comes as a pleasant surprise to read someone else's account of gear I am familiar with so nearly match my own impression when, all too often, just the opposite happens.