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Old 23rd June 2009, 06:14 AM   #1
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Default Driver testing results

Starting to post my results: http://sites.google.com/site/driverv...r-measurements

I forgot the nearfield frequency response measurements, I'll get them tomorrow. I did power compression testing tonight. I used ten minutes of pink noise at 105 dB @ 1m. Haven't decided how I'm going to post the info since it's just numbers. Not that it matters much. The differences were tiny and within the margin of error they all pretty much performed perfectly. This amount of power is incredibly loud. There is NO WAY any of us would approach this amount of power for even 1 minute in even the most over the top home theater. I am going to take the TD15M and 15NW76 on an extended test to get a better idea of the relative performance of the respective cooling methods, but this is mostly academic. With these pro woofers you will never push them hard enough for power compression to matter in home use. I thought for sure there would be a big difference, because those cones were moving!

Distortion and *hopefully* the Klippel based xmax method will be finished Tuesday.

This is a new site, so don't be surprised if it's different every time you go there. Also all of the results will be added as I finish up testing and move on to horns. Be sure to read the main page before you ask about test conditions.
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Old 23rd June 2009, 07:44 AM   #2
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Augerpro came over and borrowed a big pile of drivers from me on Sunday morning, so you can now see the results from the GPA 414 (16-ohm Alnico), 18Sound 12NDA520, and the AESpeakers TD15LO posted at Augerpro's DriverVault site.

Looking forward to seeing more data - what's already posted is looking very interesting.
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Old 23rd June 2009, 08:21 AM   #3
Ron E is offline Ron E  United States
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Default Re: Driver testing results

Quote:
Originally posted by augerpro
This is a new site
The 1.6Meg images are really unnecessary.
Here's a compressed version that is 100 times smaller and 100 times faster to load and easier on bandwidth.

Irfanview can convert all your files in a batch.
Attached Images
File Type: png z_noaic.png (16.1 KB, 1418 views)
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Old 23rd June 2009, 10:37 AM   #4
wxa666 is offline wxa666  Germany
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Default Re: Driver testing results

Quote:
Originally posted by augerpro
Starting to post my results: http://sites.google.com/site/driverv...r-measurements

I forgot the nearfield frequency response measurements, I'll get them tomorrow. ...
Be sure to read the main page before you ask about test conditions.
Great! To show the performance of Your own drivers nothing would do better than that. On the other hand Your competitors may have an eye on it and argue that Your data is corrupted for advertizing porposes? Certainly not me.

But I found something to complain. The Amplitude response could be shown over a smaller range to gain a higher resolution. 50dB should be enough.

In spite of L(x) I would display the intermodulation directly. The L(x) curve may be interesting for the chassis designer, but us as custumers want to know what comes out. I know IMD is hard to show to a satisfying extent. Prof Klippel did some work on that.
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Old 23rd June 2009, 02:15 PM   #5
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Default Re: Re: Driver testing results

Quote:
Originally posted by wxa666

Great! To show the performance of Your own drivers nothing would do better than that. On the other hand Your competitors may have an eye on it and argue that Your data is corrupted for advertizing porposes? Certainly not me.
Wha? I work at an oil refinery. No drivers being designed or sold by me.

I didn't notice the files were so big, I have a pretty fast connection. I'll look into shrinking them down.
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Old 23rd June 2009, 02:48 PM   #6
Pano is offline Pano  United States
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Cool! Thanks for sharing your hard work.

(as Ron says above, you should compress these to PNG or GIF format - if you don't know how, we can help.)
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Old 23rd June 2009, 02:50 PM   #7
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I usually use gif or jpg, but thought I'd stay with bmp since it looks the best for graphs. I didn't realize bmp were huge.

Back to testing...
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Old 23rd June 2009, 06:06 PM   #8
cuibono is offline cuibono  United States
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Default Re: Driver testing results

Quote:
Originally posted by augerpro
Starting to post my results: ...

Thanks for doing this! IMHO, we need more data on drivers. I look forward to seeing your work.
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Old 23rd June 2009, 08:46 PM   #9
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When trying to go to your site my browser says it's exceeds the bandwidth.

Man I was hoping to see your site. I've looked at you photobucket many times. Thanks for all the hard work!

Dan
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Old 23rd June 2009, 09:20 PM   #10
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I've had to block it from the public while I revise file sizes so it doesn't crash and give everyone the bandwidth error message.

Thank you for your patience
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