Speaker measurement tool DIY[ysd85]-EEWORLD

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In order to make a speaker , I made a measuring tool by myself by referring to the speaker measurement kit circuit in the forum . I wanted to draw a PCB for proofing, but I was lazy, so I built one with a universal board. Now I put it up, please take a look at any problems... Circuit: The circuit published in the forum, I used the ST-4558 op amp on hand, the power amplifier IC used was TDA2030, and the universal board was welded. Chassis: Aluminum alloy square tube + waste circuit board. Please see the actual picture:

Trial:
Using Creative SB0270 USB sound card, the scene is as follows:
Sound card calibration diagram: Impedance calibration diagram: Using 8R reference resistor Vifa-5 inch speaker impedance curve:

Sound card calibration.jpg

Impedance calibration.jpg

vifa5 impedance curve.jpg

Nanjing YDQG20-8HB impedance curve:
YDQG20-8HB impedance curve.jpg

Reference address：Speaker measurement tool DIY[ysd85]

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