TangBand W69-1042 XO at 900 Hz - opinions ? - diyAudio
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Old 10th June 2008, 12:45 AM   #1
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Default TangBand W69-1042 XO at 900 Hz - opinions ?

http://www.partsexpress.com/pe/showd...number=264-837


Questions:

1) Is this driver still produced ?


2) What are your opinions/experiences to crossing
it at 900-1000 Hz ?


Cheers
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Old 11th June 2008, 08:55 AM   #2
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The idea behind that is somewhat perverted:

W69-1042 could be dirt cheap killer applied to open
baffle, when driven with a series resistor.

The diaphragm seems capable to work properly in the
midrange. Tangband offers some bass-mid units with
similar diaphragm but different motor and suspension.

Main reason for W69-1042 to be usable as subwoofer
only is the very high voice coil inductivity (around 3,2mH)
causing rolloff above 200 Hz. That seems to be the
price to pay for the long throw voice coil design.

Connecting a series resistor Qes is pushed up and the
hump/rollof in frequency response should be smoothed.

4 of them have a cone area about 900cm2 ... and
excursion is fairly high with Xmax of 7mm, maybe linear
excursion is 4mm only i don'd know.

It seems that the driver is still on shelf but it belongs to
SU (Subwoofer) series now.

The high voice coil inductivity could be used to design
a crossover without external inductances using a
capacitor only ...

DisplacementVolume / Dollar ratio is is e x t r a o r d i n a r y
good, and the quality of the driver is really ok, i use two
of them as subwoofers in a BR design.

Cheers Oliver
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Old 11th June 2008, 10:26 PM   #3
bjorno is offline bjorno  Sweden
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Quote:
ÖWhat are your opinions/experiences to crossing it at 900-1000 Hz ?Ö
IMO, XO-ing at 900 Hz is too high for the Tb woofers if placed near the floor level due to the driver Le.
Look at the submitted pictures: 1(5)-5(5).

b

1(5)
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File Type: gif 1-fostex fe-103-and-4x tb w69-1042-ob.gif (34.8 KB, 230 views)
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Old 11th June 2008, 10:29 PM   #4
bjorno is offline bjorno  Sweden
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2(5)
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File Type: gif 2-fostex fe-103-and-4x tb w69-1042-ob.gif (52.6 KB, 232 views)
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Old 11th June 2008, 10:30 PM   #5
bjorno is offline bjorno  Sweden
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3(5)
Attached Images
File Type: gif 3-fostex fe-103-and-4x tb w69-1042-ob.gif (38.8 KB, 220 views)
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Old 11th June 2008, 10:31 PM   #6
bjorno is offline bjorno  Sweden
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4(5)
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File Type: gif 4-4x tb w69-1042-ob_xo-at-900hz.gif (32.6 KB, 217 views)
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Old 11th June 2008, 10:32 PM   #7
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Thank you for your work !

I did not see the pictures immediately.
But i think i would use a series resistor of higher value.

And i will use 2 drivers, which will have higher directivity then.
There will be around 50 cm distance to the floor.
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Old 11th June 2008, 10:37 PM   #8
bjorno is offline bjorno  Sweden
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5(5)
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File Type: gif 5-4x tb w69-1042-ob_xo 12db-down-at -250hz_.gif (21.7 KB, 217 views)
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Old 11th June 2008, 11:21 PM   #9
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This is the OB design (just a thought)

OB concept study using inexpensive bass drivers

Your graphs show, that early rolloff > 300Hz is
mainly introduced by combination of baffle step and
crossover ...

This can be circumvented by using different baffle size and
positioning of drivers.

Crossover has to be adapted too.
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Old 13th June 2008, 01:25 PM   #10
bjorno is offline bjorno  Sweden
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Hi Oliver,

Since Iíve studied your other tread I tend to agree with your comments and as someone noticed in that tread: a simulation parameter mistake must exist when comparing to the parameter settings using only one driver, Iíve taken action to correct this discrepancy too. See the pictures in 1(9)-7(9)

b

1(9)- 7(9)
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File Type: gif 1or4x tb w69-1042-ob-0.gif (33.7 KB, 148 views)
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