The Audioprism Mantissa had two volume controls, one for each channel. I believe it was a true dual mono design. Mark Levinson bought the rights to the preamp and amp designs and marketed them under his Red Rose brand. I owned and used one for twenty years. With an outboard power supply with a heavy duty umbilical and four tubes it was a very sweet preamp. It lacked a remote and it did not do spatial relationships the way my ARC Ref 6 does but it was still a very good preamp at the price-point. Incredibly quiet and reliable. Tubes lasted at least 2000 hours, even 3000.
Preamp with two volume controls?
Anyone familiar with a preamp that has 2 volume controls. Currently I use 2 Mcintosh C50 preamps in my system. One is for the 2 MC252 amps and 1 used as a volume control for my 3 SVS subs and an Anthem STR amp. The extreme differences in how bass is recorded in new verses old recordings and the wide range in low frequency mastering in the many styles of music I listen to has led me to look for different ways to rectify these issues. What I am doing works pretty well, but I would love to have a more direct method. Thanks in advance.