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Old 28th January 2009, 01:20 AM   #2831
FlipC is offline FlipC  United States
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djk

Are those sub woofers in the picture you posted old EV or JBLs?.
Since the mid and tops are JBL...
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Old 28th January 2009, 01:39 AM   #2832
Mark Kravchenko --- www.kravchenko-audio.com
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Default TANG BAND MEASUREMENTS

I did these measurements a couple of months ago. Hope I got the hosting figured out correctly!

http://picasaweb.google.com/mwmkravc...eat=directlink

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Old 28th January 2009, 03:35 AM   #2833
djk is offline djk
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"Are those sub woofers in the picture you posted old EV or JBLs?."

They are custom, and have 8mm x-max. The cabinet tuning is 6th order vented with an F3 of around 30hz and 101dB/2.83V/1M (8 ohms). Two a side are 107dB/2.83V and a 4 ohm load.


"Since the mid and tops are JBL..."

The HF are JBL2380/2441, but the mids are custom fiberglass with custom drivers similar to JBL2202. The HF most often used with this set-up is the EV HP640/DH 1A.
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Old 28th January 2009, 03:48 AM   #2834
tinitus is offline tinitus  Europe
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Quote:
Originally posted by tinitus



But if drivers are too far off, they may load each other badly under heavy load, ressonating and making things even worse
Well, Im just not so very sure about it


Sorry if you think Im being too critical towards this, but I am so even with things I believe in myself

In my world EVERYTHING has flaws somewhere, and I just like to find out exactly where the flaws are

Sorry, but thats just how I am
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Old 28th January 2009, 06:38 AM   #2835
tinitus is offline tinitus  Europe
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Hi
I hope that you dont me posting this one again

It shows how its possible to have a pushpull with drivers loading each other less, or not at all, but still a perfectly summed output

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File Type: jpg tapped twin.jpg (19.0 KB, 883 views)
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Old 28th January 2009, 06:56 AM   #2836
tinitus is offline tinitus  Europe
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Sorry, and once again, the taller and simpler version...not tapered, but only to show principle
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File Type: jpg pushpull tapped.jpg (13.7 KB, 656 views)
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Old 28th January 2009, 07:41 AM   #2837
FlipC is offline FlipC  United States
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Since I suck with Akabak can someone post a script for Tinituses fisrt pic there
Click the image to open in full size.
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Old 28th January 2009, 11:15 AM   #2838
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@mwmkravchenko
Thanx. I was talking about the klippel measurements. Those were the ones I meant:

http://www.diymobileaudio.com/forum/...omparison.html

Click the image to open in full size.

The TangBand is a little monster and I like it It does a good job in Bill Fitzmaurices Car-Horn, in several closed or ported installations, small tapped horns... But the suspension and the motor isnīt linear at all, compared to other 8". But for the price, itīs almost the only one (with the parts express euivvalent) with a very rugged cone, enough BL and high x-max...
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Old 28th January 2009, 12:30 PM   #2839
JLH is offline JLH  United States
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Quote:
Originally posted by Sabbelbacke
No, xmax of the tangbands is 12mm one side, so itīs 24mm p-p

Somewhere at another diy-site there was a klippel measurement of 8" car-subs. The Tangband has a poor BL-Curve, so putting it into an isobaric configuration (push/pull) is a very good idea.

Sabbelbacke,

You are absolutely correct. Looking at the Bl curve below, it can be seen that the 71% (Xmag) point becomes +17.5mm and -17.5mm when the W8-740 is used in push-pull. This lets us pick up and additional +/- 2.5mm than what is spec'ed for the woofer. Yummm..... more Xmax and higher peak SPL. This is the best way to use this woofer.

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Old 28th January 2009, 01:12 PM   #2840
JLH is offline JLH  United States
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After taking a closer look, allow me to correct my above post. The W8-740 actually does better than +/- 17.5mm in push-pull. See below picture.

Click the image to open in full size.
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