Purifi / Satori, Bench Top 2.1 Speakers

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#21
Hello All,

I now have the SB Acoustics SB34NRXL75 sub woofer for the project in hand.
It is massive and heavy and measures 13- 5/8 inches in diameter, bigger than 99% of the other 12 inch woofers. It requires a custom 12 inch + cutout in the enclosure.

Thanks DT

https://www.madisoundspeakerstore.com/approx-12-woofers/sb-acoustics-sb34nrxl75-8-12-woofer/

I am going to warm up the woofer and measure the T/S Parameters hopefully in the morning. I like using 2volts for the T/P P's. 2 volts is still sort of "Small", closer to the conditions where the driver will be used.
 
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#22
Hello All,

If you read the SB Acoustics SB34NRXL75-8 data sheet it notes that the T/S Parameters are measured after the driver is broken in.
I am not so sure about the break in, warm up sure makes a difference.

I made 10 or 20 measurements at 2 volts, the measurements settled in and held steady as shown in the plots below.

Impedance Imaginary SB34NRXL75 8 AP555 by me DT.PNGImpedance Magnitude SB34NRXL75 8 AP555 by me DT.pngImpedance Phase SB34NRXL75 8 AP555 by me DT.PNGImpedance Real SB34NRXL75 8 AP555 by me DT.PNG

Thiele-SmallSB34NRXL75 8 AP555 by me DT.PNG

The driver on my bench:
The resonate frequency is 18% higher than called out on the factory data sheet.
Break in?
Time will tell.

Thanks DT
 
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