Midwest Audio Fest

It’s that time audio enthusiasts! Registration for the 2019 Speaker Design Competition is now open! Visit for details and to list your speaker project. We are excited to see all returning participants, and look forward to meeting some new designers this year, as well! Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans. We hope to see you this summer! Vivian and Jill
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Low Freq Response graph

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  • Low Freq Response graph

    Could someone tell me why the response graph does not go more down to zero past the LF cutoff freq? My graphs show the LF response dropping right where it should past the F3 but then the graph jumps back up. It's similar to what the manual shows but does not follow the other freq response graphs I've seen on the low end side - which heads to zero db.
    Here is an example on this page of the manual:
    Here is a graphic of a 10" cabinet with an F3 of 60 and a HP filter set on the dbx driverack at around 80 and the graphs seem to be OK until it jumps back up at 20 Hz. Maybe I didn't have the volume up enough or room acoustics?
    HP set at 80

  • #2
    Originally posted by MS2112 View Post
    room acoustics?
    Yes. That is the elephant in the room, there is no separating the effects of the room from the response of the speakers at low frequencies, so if you want to know the response of your speakers alone you need to get them outside and well away from structures to do measurements.

    Paul O


    • #3
      Don't know why your measurement turned out that way, but you could manually edit your file. I'd set it to about 10dB @ 20Hz, 33dB @ 30.


      • #4
        Thanks for the response (pun intended). I guess I will wait for fall as it's too hot here in Texas to measure outside. I had specifically left the volume low in hopes of minimizing the room effects but I guess that's no good.