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Old 12th January 2013, 04:07 PM   #21
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Quote:
Originally Posted by Barleywater View Post
Posted measurement shows artifact in pre peak response in IR results consistent with feedback or multiple time bases (two sound cards with different clock speeds).

Peaking around 70Hz indicates we aren't looking at natural response of driver.
I use a USB mounted external sound card in my laptop with the built in SC turned off. The external SC is calibrated flat using HI's instructions.


The SS driver was mounted on baffle in speaker box. Hence the 70 hz hump.
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Old 12th January 2013, 04:24 PM   #22
gornir is offline gornir  Sweden
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Quote:
Originally Posted by speakerdoctor View Post
Have you measured the 15W/8530K 01? I did close mic'd (red line). See below.
No I haven't measured the 15W/8530K01, but it shouldn't differ to much from the 15W/4531G00 regarding the frequency response.

Without knowing your measurement conditions baffle size and shape etc, I must say it does look a bit odd especially the wrinkle at 550Hz and the elevated response between 1-3kHz. Some of it could be explained by a near-field measurement.

Here's my frequency measurement conditions:

The mid-woofer is measured mounted in a 14 liter Dayton Audio enclosure (PartsExpress part #302-721) baffle with the following conditions:
  • Baffle size (WxH): 21,59×35,56cm (8,5″x14″)
  • Driver position: Mounted on center-line with driver unit center 14cm from bottom of the baffle.
  • Mic position: 1m distance, 13.6cm above driver unit center (tweeter-axis)
  • Smoothing: No smoothing applied.

The is by far the smoothest mid-woofer I've measured.

/Göran
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Old 12th January 2013, 06:07 PM   #23
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I measured with a similar PE box. Mine has the curved sides.
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Old 12th January 2013, 07:19 PM   #24
ODougbo is offline ODougbo  United States
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Topic is hovering around small speakers, which is my preference.

FYI on the 15w/8530

W1501/
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Old 12th January 2013, 07:23 PM   #25
ScottG is offline ScottG  United States
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Old 12th January 2013, 07:57 PM   #26
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Originally Posted by ODougbo View Post
Topic is hovering around small speakers, which is my preference.

FYI on the 15w/8530

W1501/
If I ever decide to change to a conventional xover topology, I now have a design to refer to. Thanks for the link!
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Old 12th January 2013, 09:07 PM   #27
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Quote:
Originally Posted by ODougbo View Post
Topic is hovering around small speakers, which is my preference.

FYI on the 15w/8530

W1501/
If I ever decide to change to a conventional xover topology, I now have a design to refer to. Thanks for the link!
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