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Old 25th August 2008, 07:07 PM   #1
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Default Tang Band W6-789S 2 way.

Sorry to ask for something like this but i don`t know how to get started otherwise so here goes.
I wonder if somebody could model a crossover for me so i could then tweak it by ear to get it right. I know it`s beyond my skills as i have no software or measuring equipment but i`m hoping someone may be able to help. I have a pair of Tang Band W6-789S woofers and a pair of Vifa D26NC-55-06 tweeters. I`m hoping these will make a relatively simple crossover possible due to the TBs smooth roll off. I`d like to put these in a floostanding cabinet of about 1.5 cu ft.
Opinions?
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Old 25th August 2008, 07:09 PM   #2
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Default Re: Tang Band W6-789S 2 way.

Quote:
Originally posted by castlesteve
Sorry to ask for something like this but i don`t know how to get started otherwise so here goes.
I wonder if somebody could model a crossover for me so i could then tweak it by ear to get it right. I know it`s beyond my skills as i have no software or measuring equipment but i`m hoping someone may be able to help. I have a pair of Tang Band W6-789S woofers and a pair of Vifa D26NC-55-06 tweeters. I`m hoping these will make a relatively simple crossover possible due to the TBs smooth roll off. I`d like to put these in a floostanding cabinet of about 1.5 cu ft.
Opinions?
Just to note that i`ve looked all over the web for designs using this woofer and drawn a blank.
steve.
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Old 25th August 2008, 08:47 PM   #3
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Yeah, when they went on sale a few months back I looked high and low for any comments on them with no substantial results.

They look like a decent woofer, but the lack of third party tests on them kept me from purchasing them. When they clearance them out (because apparently no one is buying them) they will make a good buy I think.
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Old 25th August 2008, 10:50 PM   #4
Jay_WJ is offline Jay_WJ  United States
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Steve,

I modeled a crossover for you. This is a result of my full modeling that takes into account baffle diffraction/loss and bass response. The baffle used is 8.5" wide and 37" tall. The tweeter center is located 2.75" from baffle top and offset by 0.75" horizontally. The midwoofer center is 8.5" from baffle top. The modeled vented box has 1.4 cu ft (40 liter) internal volume with 40 Hz tuning.

Click the image to open in full size.

The crossover occurs around 2 kHz. The D26NC55 has no problem handling this xover point, according to Zaph's distortion measurement. This is a nominal 8 ohm design. Will be a benign load for any amplifier---lowest 4.8 ohms at 4 kHz.

As you may know, TB's published specs are usually not very accurate. The available specs are for the non-shielded W6-789D, not for your shielded W6-789S. According to Zaph's measurements of W5-704S and W5-704D, TB's specs are particularly not accurate for Qts (lower than actual). But the accuracy of frequency responses is not bad, only 1 dB or so higher than actual. My modeling was based on all this information and used data adjusted by my best guesses.

You'll need to fine-tune the crossover by your ear. In the crossover schematic, I suggested ranges of component values you may want to try. Refer to the section "Voicing your speakers" in my following web page:

http://www.geocities.com/woove99/Spk...esigningXO.htm

If not a perfectionist, I'd tweak only the tweeter padding (R9) and go with the default values for others (C1 and L3).

Let me know if you have any questions.

-jAy
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Old 26th August 2008, 01:15 AM   #5
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Quote:
Originally posted by Jay_WJ
Steve,

I modeled a crossover for you. This is a result of my full modeling that takes into account baffle diffraction/loss and bass response. The baffle used is 8.5" wide and 37" tall. The tweeter center is located 2.75" from baffle top and offset by 0.75" horizontally. The midwoofer center is 8.5" from baffle top. The modeled vented box has 1.4 cu ft (40 liter) internal volume with 40 Hz tuning.

Click the image to open in full size.

The crossover occurs around 2 kHz. The D26NC55 has no problem handling this xover point, according to Zaph's distortion measurement. This is a nominal 8 ohm design. Will be a benign load for any amplifier---lowest 4.8 ohms at 4 kHz.

As you may know, TB's published specs are usually not very accurate. The available specs are for the non-shielded W6-789D, not for your shielded W6-789S. According to Zaph's measurements of W5-704S and W5-704D, TB's specs are particularly not accurate for Qts (lower than actual). But the accuracy of frequency responses is not bad, only 1 dB or so higher than actual. My modeling was based on all this information and used data adjusted by my best guesses.

You'll need to fine-tune the crossover by your ear. In the crossover schematic, I suggested ranges of component values you may want to try. Refer to the section "Voicing your speakers" in my following web page:

http://www.geocities.com/woove99/Spk...esigningXO.htm

If not a perfectionist, I'd tweak only the tweeter padding (R9) and go with the default values for others (C1 and L3).

Let me know if you have any questions.

-jAy
Jay,
You`ve made me a very happy man. Thanks so much for the schematic. I will build these and fine tune as you suggest. I`ll post some pics of the build and let you know how they turn out.
Thanks again and what a great hobby this is!
Steve.

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Old 26th August 2008, 02:40 AM   #6
Jay_WJ is offline Jay_WJ  United States
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Quote:
Originally posted by castlesteve

Jay,
You`ve made me a very happy man. Thanks so much for the schematic. I will build these and fine tune as you suggest. I`ll post some pics of the build and let you know how they turn out.
Thanks again and what a great hobby this is!
Steve.

Yeah, please let me know how they turn out. Adjusting BSC by experimenting with L3 is relatively a bit difficult compared to other adjustments. I'm pretty sure the default 2.2 mH will work for you. I recommend using a Jantzen P-Core or Erse Super Q inductor for this value.

As for the driver positions on the baffle, you have some flexibility. If you want, you can move the woofer a little upward to make its spacing to the tweeter tighter. Also you can center the tweeter without an offset. These changes may affect the tweeter's diffraction pattern slightly. But fine tuning the tweeter network by adjusting R9 and C1 values will take care of these minor FR changes to your liking.

-jAy
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Old 14th November 2008, 03:39 AM   #7
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Default W6-789s 2 way.

Quote:
Originally posted by Jay_WJ
Steve,

I modeled a crossover for you. This is a result of my full modeling that takes into account baffle diffraction/loss and bass response. The baffle used is 8.5" wide and 37" tall. The tweeter center is located 2.75" from baffle top and offset by 0.75" horizontally. The midwoofer center is 8.5" from baffle top. The modeled vented box has 1.4 cu ft (40 liter) internal volume with 40 Hz tuning.

Click the image to open in full size.

The crossover occurs around 2 kHz. The D26NC55 has no problem handling this xover point, according to Zaph's distortion measurement. This is a nominal 8 ohm design. Will be a benign load for any amplifier---lowest 4.8 ohms at 4 kHz.

As you may know, TB's published specs are usually not very accurate. The available specs are for the non-shielded W6-789D, not for your shielded W6-789S. According to Zaph's measurements of W5-704S and W5-704D, TB's specs are particularly not accurate for Qts (lower than actual). But the accuracy of frequency responses is not bad, only 1 dB or so higher than actual. My modeling was based on all this information and used data adjusted by my best guesses.

You'll need to fine-tune the crossover by your ear. In the crossover schematic, I suggested ranges of component values you may want to try. Refer to the section "Voicing your speakers" in my following web page:

http://www.geocities.com/woove99/Spk...esigningXO.htm

If not a perfectionist, I'd tweak only the tweeter padding (R9) and go with the default values for others (C1 and L3).

Let me know if you have any questions.

-jAy


Jay,
just a note to say thanks for the design. I`ve been playing these for a few weeks now and am delighted with them. I have them in a pair of mltl cabs and the bass response is very good. Highly recommended for a pair of good affordable speakers.
Regards, Steve.


http://img.villagephotos.com/p/2008-...etspeakers.jpg
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Old 14th November 2008, 03:49 AM   #8
Jay_WJ is offline Jay_WJ  United States
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Thanks for the update, Steve. Glad to hear that you like it. Did you fine tune the crossover? If so, what component values did you end up with?
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Old 14th November 2008, 02:29 PM   #9
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Quote:
Originally posted by Jay_WJ
Thanks for the update, Steve. Glad to hear that you like it. Did you fine tune the crossover? If so, what component values did you end up with?

Jay,
I went with the not too fussy approach and settled on a 3.0 0hm resistor on the tweeter and a 2.0 mh coil on the woofer circuit. All other values are the same more or less according to what i had in my parts box. I must say however that the Tangband is a fine woofer. It reminds me somewhat of the old Vifa P13 but with much more bass.
Thanks again, Steve.
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Old 15th November 2008, 02:59 AM   #10
Pano is offline Pano  United States
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It's a shame that not more people use this driver - it's a good one.

My fault that your search did not turn up anything - I wrote the model # wrong in this thread.

It really can play both high and low and has a nice sounding midrange. I was using 2 per box (bass reflex) and a horn tweeter. The wide range of this driver makes it easy to super cross as it will actually play up to about 12K.

I never did get the tuning of the box right, so went on to open baffle stuff, but I still like the driver. A buddy of mine bought a pair to use with the Hi-Vi planar tweeters in a 2 way. Don't think he ever built it. Pity....
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