• RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff - Scot 06:59:46 11/24/15 (4)
  In Reply to: RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff posted by neolith on November 24, 2015 at 06:39:14

  
  
  

  
  My right speaker is similar, but I must have accidentally deleted the run with it. The only real difference is a 50hz hole on the right side, but that is due to the room.
  
  
  
  

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  • RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff - Satie 14:38:43 11/26/15 (2)
    In Reply to: RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff posted by Scot on November 24, 2015 at 06:59:46

    That is very low bass output, I would even guess there is at least one loop on each bass panel with a disconnect.
    
    Check out the impedance on the bass panel terminals - if you have something other than 4 ohms or so then you likely have a problem. If it measures 8 ohms then you likely have the disconnect and you should look for it in the wires or the solder joints. You can also play the amp connected directly to the bass panel and see if you get good output to make sure there is nothing wrong with the low pass filter in the XO. .
    
    
    

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    • RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff - Scot 17:44:32 11/26/15 (1)
      In Reply to: RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff posted by Satie on November 26, 2015 at 14:38:43

      Removed the crossovers to check the resistance, 4.1 ohm in both. So that seems to be within the margin of error for working properly.
      
      My system has been "in use" by my daughter for two days now, so I haven't been able to re-test using just the bass hookups, bypassing the crossovers. Soon!
      
      One strange thing, I looked in the crossover boxes, one side had 3 richey caps on the bass side, two 100s and one 75mf. The other speaker had four, 1 75, 2 50s and a 100mf. Guess they ran out of 100s that day :)
      
      
      

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      • RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff - Satie 10:11:42 11/27/15 (0)
        In Reply to: RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff posted by Scot on November 26, 2015 at 17:44:32

        If they were scraping the bottom on their stock of caps they may have used ones that were suspect. If the bass improves dramatically on a switch to direct connection to the bass panels without the XO then you might want to go to active biamping to bypass the XO..
        

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  • RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff - josh358 13:02:22 11/25/15 (0)
    In Reply to: RE: Magnepan 3.5 low end dropofft and some high end harmonics/dropoff posted by Scot on November 24, 2015 at 06:59:46

    Try plugging your room dimensions into an online mode calculator. You may just have an unfortunate combination of room modes and placement/listening position. 10 dB room-dependent swings in bass aren't at all unusual. Dip a bit above 100 Hz could be modal or cancellation from the front wall reflection. Solutions would include new placement, bass trapping, and supplementation with a sub or DWM's.
    
    No sense in measuring the woofers from 1 meter, they'll show a lot more bass in the near field. Dipole bass has to be measured further away.
    

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