AESPEAKER td18h-4ohm t/s specs - AVS Forum
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post #1 of 11 Old 06-04-2012, 07:26 PM - Thread Starter
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just some quick testing much lower fs others seem close enough. ill put it in a box tomorrow and see how it does. i bought 3 of these from someone on here and they all test the same. also a jbl 2226 measures within 10% of its specs so the dats is accurate enough.

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post #2 of 11 Old 06-04-2012, 08:02 PM
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Broken in, or fresh out of the box?

 

Originally Posted by Bill Fitzmaurice:
It's also the very sort of Voodoo Engineering that should never be done.

 

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post #3 of 11 Old 06-04-2012, 08:36 PM - Thread Starter
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Originally Posted by WiSounds View Post

Broken in, or fresh out of the box?

fresh im breaking all 3 in atm ill take the same measurements again tomorrow.
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post #4 of 11 Old 06-06-2012, 10:13 AM
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Looking at your parameters I see some inaccuracies right away. First, please see the article I wrote on measuring T/S parameters I wrote some time ago. The Mass added method is not an accurate way to measure parameters for a woofer.

http://www.aespeakers.com/phpbb2/viewtopic.php?f=4&t=927

I see that the Mms according to your measured parameters is 270 grams. This cannot be correct. Measured Mms is around 165 grams. This is easily verified by physically measuring the coil, cone, then half the surround and spider. This also throws off the Bl and SPL measurements.

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post #5 of 11 Old 06-06-2012, 03:52 PM - Thread Starter
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Originally Posted by John_E_Janowitz View Post

Looking at your parameters I see some inaccuracies right away. First, please see the article I wrote on measuring T/S parameters I wrote some time ago. The Mass added method is not an accurate way to measure parameters for a woofer.
http://www.aespeakers.com/phpbb2/viewtopic.php?f=4&t=927
I see that the Mms according to your measured parameters is 270 grams. This cannot be correct. Measured Mms is around 165 grams. This is easily verified by physically measuring the coil, cone, then half the surround and spider. This also throws off the Bl and SPL measurements.
John

i got within 10% of your specs last night using magnets on each side of cone and clamped to the side of a pool table i have in my garage with weights about a ton besides for the fs with i was getting 20hz or below did u change cones ? i noticed its different then the pics on your site.
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post #6 of 11 Old 06-09-2012, 10:42 AM
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Originally Posted by cookieattk View Post

i got within 10% of your specs last night using magnets on each side of cone and clamped to the side of a pool table i have in my garage with weights about a ton besides for the fs with i was getting 20hz or below did u change cones ? i noticed its different then the pics on your site.

You can measure Fs directly using REW and a series resistor in line with any low power amp.

Connect your Line-in cable to the driver terminals instead of your test mike and run a sweep.

REW then measures impedance instead of level.

Are links to other forums acceptable on here?

Original suggestion from Dan on the REW forum back in 2007:

http://preview.*******.com/btbyshd
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post #7 of 11 Old 06-09-2012, 06:44 PM - Thread Starter
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Quote:
Originally Posted by Chris.ib View Post

You can measure Fs directly using REW and a series resistor in line with any low power amp.
Connect your Line-in cable to the driver terminals instead of your test mike and run a sweep.
REW then measures impedance instead of level.
Are links to other forums acceptable on here?
Original suggestion from Dan on the REW forum back in 2007:
http://preview.*******.com/btbyshd

the fs is correct ive tested bunches of drivers now and they are all within 3db of the fs on the spec sheet besides the ae driver.
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post #8 of 11 Old 06-25-2012, 12:58 AM - Thread Starter
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near field test of td18 4ohm both graphs 1/24th no eq

236


also crossed it @ 1500 with my tweeter

236
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post #9 of 11 Old 06-25-2012, 01:30 AM
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^^ Were these done with tone sweeps? Where was the mic and speaker placement in room?
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post #10 of 11 Old 06-25-2012, 01:51 AM - Thread Starter
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^^ Were these done with tone sweeps? Where was the mic and speaker placement in room?

both done with the pseudo noise near field one was taken from 3'' from the phase plug and 2nd graph is from about 5-6'' i should also note this is in a 2.2-2.35 cf box with a single 18'' ae pr. speaker is about 1'' from side walls between 2-3 ft from back wall with a 24x48 basstrap in the corner
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post #11 of 11 Old 06-25-2012, 08:38 AM
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Quote:
Originally Posted by cookieattk View Post

both done with the pseudo noise near field one was taken from 3'' from the phase plug and 2nd graph is from about 5-6'' i should also note this is in a 2.2-2.35 cf box with a single 18'' ae pr. speaker is about 1'' from side walls between 2-3 ft from back wall with a 24x48 basstrap in the corner

Here is a curve someone else measured on here awhile ago nearfield with the TD18H-8ohm. curves should be nearly identical between 4-8ohm.

295

The dip seen at 200hz is typical with what is measured with a speaker placed in front of a wall. The reflected wave from the back wall often causes a dip. Wavelength of 200hz is right around 67". So the distance of 2-3ft from the back wall would be right in that range. Try moving it forward or backwards and measuring the same way. That should move the dip around.

John

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