Here's mine. I put my phone on top of the speaker in the middle and pull up a compass app and just rotate the speaker while REW does repeated measurements. It's a pretty annoying setup to use but it did generate some off axis data that was useful for filter development. I want to make a better system but I also just want to buy some ascilab and call it a day lol.
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mikewxyz
Member
Here are the measurements using my DIY turntable. I think the non-uniform spacing between the two middle angles (30* & 45*) and the rest is a function of the turntable base being more exposed to reflections at these positions. Taking accurate measurements is difficult but the results seem OK to me.
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Curvature
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You can try developing a compensation filter for those angles using a known source. For example, a flat-measuring speaker reviewed by Amir or Erin.
mikewxyz
Member
Thanks for the suggestion Curvature. I didn't intend to do anything with the data - more just a curiosity. $8 and some wasted time is about the level of investment I'm comfortable with. I would not spend the money to buy known measured speakers to use as a "measurement standard" for a gauge study.
terryforsythe
Major Contributor
Here is my turntable setup I just finished building and testing. I still need to cut down the platform and mount it to my ladder, but it seems to be working well.
It uses an Adafruit controller and stepper driver expansion board, connected to a Nema 17 stepper motor. It uses a 6mm belt to spin the table using a 4:1 gear ratio.
I created a Python GUI to run it. The GUI runs both on my Linux computer and my Windows laptop.
It uses an Adafruit controller and stepper driver expansion board, connected to a Nema 17 stepper motor. It uses a 6mm belt to spin the table using a 4:1 gear ratio.
I created a Python GUI to run it. The GUI runs both on my Linux computer and my Windows laptop.
terryforsythe
Major Contributor
I have the GUI working with REW to automate the measurement and rotation process. I explain it in this post:
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Modifications to Elac Uni-Fi Reference UBR62 Bookshelf Speakers
What do you call that connector? It is a circular connector with push-pull locking. The manufacturer is Weipu. It is in the WEIPU IP67 - Large SA28 series. There are different pin configurations available - see the section "Solder Spec". https://www.weipuconnector.com/products/sa28/ They...
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