Tweaker's Asylum

• Re: NHT 1.5 crossover mod? - R. Hertz 12:44:33 12/20/01 (2)
  In Reply to: NHT 1.5 crossover mod? posted by csown on December 20, 2001 at 06:31:09:

  Crossover modifications usually involve upgrade/replacement of capacitors, resistors, and inductors. Existing caps (especially if they're electrolytics) can be replaced with upgraded film types like Solen, Auricap, MIT, or Hovland. Resistor replacements should be non-inductive. Mills, Eagle, and Ohmite are good candidates. You can also replace inductors (coils) but new ones should have the same resistance (within an ohm) as well as the same inductance as the originals. Use air core for best results, although if space prohibits air cores, steel laminate can be used.
  
  

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  • Thx - csown 21:59:02 12/20/01 (1)
    In Reply to: Re: NHT 1.5 crossover mod? posted by R. Hertz on December 20, 2001 at 12:44:33:

    Thanks for the info. I remember reading somewhere that a particular combination gave great results. It involved shifting the crossover frequency and maybe even changing the slopes to higher-order, though I'm not sure. It is supposed to tame the forward-ness of the Al tweeter and warm up the midrange.

    Anyway, I'll keep looking. Thanks,

    Chris
    
    

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    • if you can... - chiggy 07:28:10 12/21/01 (0)
      In Reply to: Thx posted by csown on December 20, 2001 at 21:59:02:

      hello,

      if you are able to, measure the l-Pad values on the tweeter, go to a tweeter L-Pad calculator page (do a search) and experiment with dropping the entire tweeter range a few dbs. you'll need to know the driver ohm values as well to carry out this tweak.

      I did this mod some time ago with the 1.5's, but don't remember the values I used, nor do I have the speakers around anymore to help out. I DO remember that I dropped the value 2-3 db's and that really helped out the clinical sound. a warm midrange you may never get with these speakers. you will get a very clear picture of the music though. you could try replacing or bypassing the caps with paper-in-oil caps as well. the paper cone woofer is pretty detailed as well, and you may want to consider replacing the inductor. i'd go with the caps+resistors first though as they are easier to play with and may just be enough.

      good luck,
      chiggy
      
      

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