• RE: This deserves it's own post...I have personally never tried this... - Utley1 11:57:03 01/06/15 (3)
  In Reply to: RE: This deserves it's own post...I have personally never tried this... posted by Mark Man on January 06, 2015 at 10:45:10

  I found it very necessary. I do not have a bright room....I have auditioned tube amplifiers with Maggies. Unless I was willing to spend 4x the price of the speakers on tube amps (they did not deliver a crisp bass sound in the lower price categories)...(Not fair to mention brands) Impedance problems (tube preamp) into 47K precludes many excellent tube preamps without internal adjustments. I am using a Vintage Crown Sl2 preamp, which does provide space depth and bass clarity but is a bit raw. I found the change in adding an $8 chokes dramatic and pleasurable. I am using the Emotiva XPA1's mono amps which I think are fairly neutral so they reacted positively to the choke rather than the 1 ohm resistor.
  

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  • RE: This deserves it's own post...I have personally never tried this... - Swamis Cat 13:20:21 01/06/15 (2)
    In Reply to: RE: This deserves it's own post...I have personally never tried this... posted by Utley1 on January 06, 2015 at 11:57:03

    Hi Utley,
    
    Could you explain the 47 k impedance issue to someone like myself who is electronically challenged? When is this an issue in preamps? Is it a preamp to amp issue or a preamp to speaker issue? Or something else all together?
    
    Just trying to learn. Oh, and I also have that same amp, oddly enough.
    

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    • RE: This deserves it's own post...I have personally never tried this... - Utley1 15:36:34 01/06/15 (1)
      In Reply to: RE: This deserves it's own post...I have personally never tried this... posted by Swamis Cat on January 06, 2015 at 13:20:21

      Here is the deal as explained by JSM and others on the board. (JSM Had Sanders put in 100 ohm modification to match his excellent CJ preamp)
      Satie and Dave will jump in and correct me I hope. A non electronic explanation: If the input impedances are significantly in variance(Most tube preamps have 100 ohms you will have a loss of dynamic range , especially at the bottom end.Most solid state amps are designed between 20 and 47 ohms. (Go to impedance matching on Google or on this site) Amp and preamp will play but not at their dynamic range which is extensive on modern equipment. There will also be a loss in potential volume...I know I muffed this but maybe it is a bit helpful. The folks at Emotiva technicians told me something similar. That I best modify the mono block if I wanted to use the CJ 05 preamp. I am sure the guys will come aboard and help you better than I.
      

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      • RE: This deserves it's own post...I have personally never tried this... - Swamis Cat 08:11:01 01/07/15 (0)
        In Reply to: RE: This deserves it's own post...I have personally never tried this... posted by Utley1 on January 06, 2015 at 15:36:34

        Thanks Utley. Very informative. I have two preamps, one of each.
        

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