c-j technical questions

What is your demanding 4 ohm load? And again if you tell them (cj) what you are driving I am sure they could provide some direction. You could also as the speaker manufacturer assuming that you are planing on driving a pair of speakers.

Chuck

Hi Chuck, Thiel 3.5's. These speakers are 89db at 1 watt/meter and a use an active equalizer with an in-put impdeance of 91 KOhms and an out-put impdeance of 130 Ohms (RCA's only) that draws up to 12 db of boost below 70Hz. Thiel recommends between 50-250 watts per channel, but, that is based on an amps 8 Ohm rating and ASSUMING that the amp can double down. That boost coupled with the 4 Ohm nomial/minimal rating is what concerns me. If I'm correct, and assuming that the speaker could regularly draw 15 watts that after boost it could be drawing 240 watts. Knowing how amps could actually perform in it's intended use could narrow my choices down to a reasonable number. Thiel recommends c-j amongst others and c-j claims that their amps work with Thiel, but, I think it's fair to suggest that I deserve more concrete answers. The equalizer also adds a bit of complexity with regard to impdeance matching and to the fact that it doesn't offer balanced in and out between pre and amp, but, I think this might be less of a concern, unless of course any one has other ideas. I'm open to suggestions.

I have a CJ MF-200 which is good into 1 ohms. These amps have alot of current. You should have no issues with these amps concerning power into 4 ohms. I believe my amp puts out 250 watts per channel into 8 ohms and over 400 watts into 4 ohms. I have an old review somewhere. The Mf-2300A is basically the same amp just tweaked with more exotic parts. I spoke to Bill Thallman who used to design this stuff. He said the 2500 has better bass and drive, but the 2300 has a warmer more natural midrange. I will be selling my amp soon since I upgraded to a Pass amp. I kept my CJ a long time. I tried many highly rated amps in my system to try and better the CJ. I kept coming back to the CJ, and sold the other amps (Llano, Odyessey, Belles, McCormack) until I got the Pass amp. I remember reading someone else who owned the MF-200 with speakers dipping into 1 ohm. The CJ amp had no problems. The transformer on this amp is monsterous.

If they weren't clear,its for a reason,look for another amp.I have no CJ experience,but you know when people are confident and when there not...good luck,Bob

I own the MF2500 and have asked this question of CJ in the past. I was told that the MF2500 will put out 400 watts per channel into a 4 ohm load. I did not perceive any reluctance on the part of CJ to give me this information.