High Efficiency Speaker Asylum

Posted by Retsel (A) on October 13, 2009 at 13:45:41

In Reply to: RE: Just Completed My First Open Baffle - Very Pleased posted by FloridaJim on October 11, 2009 at 14:45:23

It would be worthwile knowing the frequency response to see if you need to adjust the frequency response of the Lowthers. I have DX4s on open baffle, and without a crossover, they were unlistenable (high frequencies were tipped up). Because of the weaker magnets of the PM6s, you very well could do without a crossover.

You definitely need a set of subwoofers, so tieing those in and developing a seamless crossover will be challenging, but very worthwhile.

The Lowthers do not have sufficient x-max for running wide open on open baffles. You should plan on high passing them with a 1st or 2nd order crossover at around 100 to 150 hz. It is good having 15 ohm drivers because of the greater x-max.

Retsel

• RE: Just Completed My First Open Baffle - Very Pleased - FloridaJim 17:39:04 10/13/09 (1)
  In Reply to: RE: Just Completed My First Open Baffle - Very Pleased posted by Retsel on October 13, 2009 at 13:45:41

  Thanks for your comments.
  
  Re: "The Lowthers do not have sufficient x-max for running wide open on open baffles", I have read about x-max, but cannot say that I understand it. With respect to my Lowthers, why should I care about it? Will I damage the drivers or is it a performance issue or both?
  
  Best regards,
  Jim
  

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  • RE: Just Completed My First Open Baffle - Very Pleased - Retsel 13:48:42 10/16/09 (0)
    In Reply to: RE: Just Completed My First Open Baffle - Very Pleased posted by FloridaJim on October 13, 2009 at 17:39:04

    X-max is the distance that the driver can travel before the magnet leaves the gap, and distortion skyrockets. You definitely want to keep your drivers operating within the x-max of the drivers. The x-max for 15 ohm Lowthers is 3 mm which is not very much....
    
    X-mech is the mechanical limit for the driver, beyond which the driver can be damaged. I don't know what the x-mech is for Lowthers, but Jon ver Halen has suggested high-passing the Lowthers at 150 hz to protect the drivers.
    
    If the driver is moving a lot to reproduce bass signals, it is likely distorting the midrange sound of the driver. This is because of doppler distortion (the driver is reproducing midrange signals which is being reproduced with small driver movements, while reproducing bass signals with large driver movements - the midrange signals are being distorted). For this reason, bass signals should be left for woofers and the Lowthers reserved solely for midrange and high frequencies.
    
    Retsel
    

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• RE: Just Completed My First Open Baffle - Very Pleased - FloridaJim 16:00:41 10/13/09 (0)
  In Reply to: RE: Just Completed My First Open Baffle - Very Pleased posted by Retsel on October 13, 2009 at 13:45:41

  I have a pair of 85hz high pass filters -- uninstalled. Is this close enough to 100 hz?
  
  Thanks,
  Jim Bailey
  

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