2. amps-preamps
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Amp upgrade question

I have a passive bi-amp w/ two CJ SS amps. I can pull this off because they have the same gain, sensitivity and input impedance. The amps are an MF-2500 upgraded to a 2500A running LF and an MF-2100 running HF. 250 WPC on the LF 100 WPC on the HF. I'd like to get better performance on the HF. It's not that I need it louder so much as wanting it better. It's not bad now by the way.The question is should I throw $500 at an upgrade by a great shop (new Cardas Rhodium RCA's,speaker binding posts, silver wire, faster/better PS diodes) or just buy an MF-2250 which show up here for 900-1200 usually. It is a more recent amp with better quality and 120 WPC which would also be the exact match needed for my passive bi-amp in terms of input imp., sens, gain. I would love to have tubes for my HF amp but feel I would need a power amp w/a gain control as finding those same needed input specs would be tough. I use a passive line stage. Thanks in advance for any suggestions.

ET
electroid

Showing 1 response by bdgregory

bdgregory
1,708 posts
 
what speakers are you driving? Have you tried simply using the 2500A by itself in biwire? with the juice it has I'd expect it to do better full range than the biamp arrangement you currently have. At one time I used dual CJ MF2100s vertically biamped - but the benefit was based on the fact it's short on power.

If it were me, I would first try the single MF2500a, and if I really thought I needed more juice - get another MF2500a and go vertical biamping. This also permits shorter speaker cable runs if you position the amps next to the speaker.

The other option would be to try tubes on the top. Many tube amps have a volume pot that permits balancing out the volume, but my attempt at this was less than fully satisfying (ie it was more trouble than it was worth).
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