I have an Audio Prism Mantissa, which was bought by Red Rose and is called the Model 3. The Mantissa came in 3 flavors, the standard, the upgraded power supply, the silver signature (which includes the upgraded power supply). I'm not sure what the Red Rose Model 3 includes.
As for my experience, I had a McCormack TLC-1 (passive) into a DNA .5 Deluxe amp. I searched long and hard to find a preamp that had the transparency of the passive but added the bloom of tubes andas well as the added dynamics that a passive doesn't necessarily give you. Damn, it's amazing how colored most active preamps sound after having a passive. I tried ARC, CAT, BAT, Audible Illusons and others in many flavors. The CAT Ultimate would have been my second choice over the Mantissa (but it was a cost based issue). The BAT's were also nice, but the Mantissa won out. For the $2000 list price (street price of $1500-1750) it was a steal. Now I'm sure Red Rose charges a lot more and puts it in direct competition with the CAT and the others you mentioned, like the LAMM and Joule and Hoveland. That's where it belongs, but I really can't say how it compares to them, I only compared to others at the $2000-2500 price point.
One positive thing, you don't see many for sale used. That's usually a telling sign.
Good luck,
Bob
As for my experience, I had a McCormack TLC-1 (passive) into a DNA .5 Deluxe amp. I searched long and hard to find a preamp that had the transparency of the passive but added the bloom of tubes andas well as the added dynamics that a passive doesn't necessarily give you. Damn, it's amazing how colored most active preamps sound after having a passive. I tried ARC, CAT, BAT, Audible Illusons and others in many flavors. The CAT Ultimate would have been my second choice over the Mantissa (but it was a cost based issue). The BAT's were also nice, but the Mantissa won out. For the $2000 list price (street price of $1500-1750) it was a steal. Now I'm sure Red Rose charges a lot more and puts it in direct competition with the CAT and the others you mentioned, like the LAMM and Joule and Hoveland. That's where it belongs, but I really can't say how it compares to them, I only compared to others at the $2000-2500 price point.
One positive thing, you don't see many for sale used. That's usually a telling sign.
Good luck,
Bob