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Topics - rbashley

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I am attempting to use Signal Scope Pro for Mac to perform frequency response tests for a Hi-Fi Speaker and Subwoofer system. The equipment I am using is as follows:

Microphone: Rode NT2000 Professional Studio Condenser Mic (this has a pretty flat response down to 20 Hz with a slight lift around the 10 KHz)

Audio Interface: Apogee Duet (features a microphone pre-amp with 48V phantom power)

Computer: Mac Pro running Mavericks

Signal Source: Test CD with 20 Hz to 20 KHz sweep test tone

I can achieve a frequency response using the 1/3 Octave Analyser and peak hold function. However, I would like to use the FFT Analyser to provide more detail on frequencies. I have read the tutorial on how to do this but cannot find the way to create a frequency trace which draws the whole response (and remains) on screen. The tutorial shows a completed frequency response for an interface. Every time I try to follow the instructions the FFT only shows me what is happening at that precise moment, not the full result of the frequency sweep from 20 Hz to 20 KHz.

Am I doing something wrong? I cannot seem to find any way to recreate the frequency response graph as shown in the tutorial. I have also tried using the Signal Generator function to provide the Test Tone sweep but this makes no difference.

I am aware of the limitations of measuring in a room and the effect it has on response. I have a room that has been professionally acoustically treated with absorption and bass traps so I have a good understanding of acoustics.

Regards
Richard

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