2. speakers
  3. 177913-170624

test crossovers or capacitors with frequency sweep

Hi everyone - I know that with an inexpensive calibrated mic (eg umik) and cheap/free software that generates a frequency sweep you can produce a frequency versus loudness curve for your speakers. If you have this curve from the factory (it came with my speakers, Celestion 700) can you examine the match between your curve and the factory one to see if of some of the crossovers have changed? Wondering if I should recap as I just bought these used, and this seems like a way you could see if there is enough of a change to matter. Thanks for your help.

arhgef
erik_squires
15,928 posts
 

Unless you are very experienced with using measurement mics this is a bad idea.  The variance in results will just drive you nuts.

 

The best way to do this is to use an impedance tester. Dayton Audio DATS is a great unit, even seen it used at a major high end manufacturer. Around $200 I think. You could also roll your own with Room EQ Wizard.

 

arhgef OP
52 posts
 

thanks- my main issue is that it is really hard to get to the crossover for one of the speakers that I also want to work on (B and W 803 matrix series 2).  

erik_squires
15,928 posts
 

Yep, the DATS is the way to go. 

rodman99999
6,033 posts
 

Unless you are very experienced with using measurement mics this is a bad idea. 

The variance in results will just drive you nuts.

                                                     +1

     Typically: manufacturers curve their systems, using closely calibrated mics and equipment, in an anechoic chamber, which most (normal) folks don't have in the home.

     

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