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analyzing my Linux/ecasound dsp crossover speaker system
analyzing my Linux/ecasound dsp crossover speaker system
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Old 5th August 2017, 08:07 AM   #1
gibbyj is offline gibbyj
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Default analyzing my Linux/ecasound dsp crossover speaker system

I don't understand the frequency response curves I'm getting; I see some periodic dips at what may be harmonic frequencies. Please see plot attached. Am not sure I'm going about my speaker system analysis the best way, and may have something configured incorrectly, like how the signals are clocked/synced in the Tango. Maybe I should be using REW right on my Linux box instead of TrueRTA on separate laptop. I'm using AVLinux on a modern PC, dsp 3 channel crossover system in Ecasound (a la Richard Taylor), RME HDSP PCI sound card, Tango 24 optical interface. I run TrueRTA on a separate laptop computer, connected to a Behringer usb interface. I connect the usb interface to Tango 24 inputs, send the test impulse signal, it gets processed on the Linux box thru my Ecasound 3-way crossover, back out thru the RME/Tango to amplifiers & speakers, into the usb interface thru a calibrated microphone, back to TrueRTA. I get no xruns with 64 sample buffer. My system actually sounds pretty good, with movies and with my digital piano. But to properly analyze and improve it, I've got to understand this weird frequency response I'm seeing. Thanks for your help.
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Old 6th August 2017, 04:38 AM   #2
1201 is offline 1201  United States
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what does a loopback measurement look like?
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Old 6th August 2017, 05:16 AM   #3
CharlieLaub is offline CharlieLaub  United States
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My 2 cents: learn to use ARTA. Perform a gated impulse measurement and then extract the frequency response. Like this:
http://audio.claub.net/tutorials/FR%...ing%20ARTA.pdf

That's a better approach than your RTA...
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Old 6th August 2017, 11:19 AM   #4
gibbyj is offline gibbyj
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Quote:
Originally Posted by CharlieLaub View Post
My 2 cents: learn to use ARTA. Perform a gated impulse measurement and then extract the frequency response. Like this:
http://audio.claub.net/tutorials/FR%...ing%20ARTA.pdf

That's a better approach than your RTA...
Yes, I actually have been reading the ARTA manual, was wondering if this suggestion would come up. What a great manual it is... I think I will go this route. Maybe I wasted my money on TrueRTA, but that's life sometimes.

Also I will try again the loopback test mentioned by another response. But this time with ARTA... I am just a real newbie to all this, and I don't have that much time to devote to it each week. Thanks for the advice!!!
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Old 6th August 2017, 07:22 PM   #5
CharlieLaub is offline CharlieLaub  United States
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When you use ARTA to measure your speaker, make sure to add in the microphone response curve so that ARTA will correct the measured data for the mic's response. It's all in the manual.
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Old 6th August 2017, 07:42 PM   #6
eriksquires is offline eriksquires  United States
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Hi Gibyj,

Gated measurements are the way to go, but if you want to see things improve, measure within 1" of your driver.

Best,

E
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