Preamps

4425,

I appreciate your concern. Unless I come into a lot of money I'm definitely not replacing my JR 625 S2. The verdict is still out on the Corus and it really depends on what I hear relative to the cost of changing preamps. I may hear some preamps that are different, but not worth changing from the Corus.

ricred1, 4425,

I just contacted Audio Research about your statement that the ARC preamps having issues with subwoofers, and they said there would be no problem.
Where did you get that info?

ozzy

ozzy
I just contacted Audio Research about your statement that the ARC preamps having issues with subwoofers

ricred1 OP
I can understand "they" may have, as AR pre’s being tube are output capacitor coupled, are used to seeing tube poweramps of up to 100kohm input, and many subs have a very low input impedance 10kohm
  
You need a big output coupling cap if you want to get down flat to 20hz with 10kohm input, and they may not be big enough.


And I just looked your sub is 10kohm input!!


Cheers George

ozzy,

AR told me that their preamps have two inputs so it should have no problem driving an amplifier and subwoofer, but based on the low input impedance of the subwoofer many say it isn't optimal from a technical standpoint. The guy I talked to at AR agreed that it may not be optimal. 

georgehifi, ricred1,

Thanks for the information. But since the subs are self powered I don't see how the preamp output impedance can affect the sub. Also, the JL subs have a mic/calibration system, that would seem to me it would compensate for any possible low bass rolloff. Now, if having the sub connected affected the performance of the main amps then I would be concerned.

ozzy