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Old 25th September 2013, 10:10 PM   #1041
Coen is offline Coen  Netherlands
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Quote:
Originally Posted by xrk971 View Post
Coen,
I did a sim for Cal's FF125WK driver a few posts back. It looks pretty good and I believe had sufficient xmax. But I think you can get better performance from the W4-1052SDF driver as it has more bass extension and costs less.

**lots of simulations **
It's just amazing how fast you come up with those sims, dont do to much work on my account, i almost feel ashamed for posting those now Those W4-1052SDF drivers do look very nice in the sim, tried them out by any chance?

Quote:
Originally Posted by Cal Weldon View Post
While X is doing all the hard work, I'll tackle this one. I don't see an advantage to using wood for the spirals but definitely use it for the front and back.
Only looks and durability then, well i still do have 22 foamboards left and it would be a shame not to use them..
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Old 25th September 2013, 10:25 PM   #1042
petervr is offline petervr  New Zealand
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Or maybe the Tang Band W4-1879??

Not cheap ($129 each... ) with neodymium magnet, bamboo fiber cone, but specs look pretty good for going low:

FS: 55Hz
QTS: 0.43
Xmax: 5mm
SPL: 87db
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Old 25th September 2013, 10:54 PM   #1043
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Coen View Post
It's just amazing how fast you come up with those sims, dont do to much work on my account, i almost feel ashamed for posting those now Those W4-1052SDF drivers do look very nice in the sim, tried them out by any chance?



Only looks and durability then, well i still do have 22 foamboards left and it would be a shame not to use them..
It's fast because the model is built and I have a database of 100+ drivers on hand that I have created over time. So no problem to help. I have not tried the W4-1052SDF but I know Prezden has tried the W3-1320SIF and he really likes the sound of it. This one is similar but has poly cone and higher Qts which will give a slightly better bass extension. If you want a sure thing, you can't go wrong with the 1320SIF Bamboo paper cone. No need for fancy drivers with Nd magnets - which will tend to have a more powerful motor with lower Qts and not as deep bass extension for the same fs.

I agree with Cal that wood channels will not sound better - the foam may actually have beneficial acoustic damping effects.

Here is the W4-1879 in a 27.55 in x 5 in deep Cornu - very similar to the lower priced W4-1052SDF, but less bass extension.
Attached Images
File Type: png Cornu-27p55x5-W4-1879-Freq-1m.png (30.1 KB, 356 views)

Last edited by xrk971; 25th September 2013 at 11:04 PM.
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Old 26th September 2013, 12:53 AM   #1044
petervr is offline petervr  New Zealand
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Quote:
Originally Posted by xrk971 View Post
Here is the W4-1879 in a 27.55 in x 5 in deep Cornu - very similar to the lower priced W4-1052SDF, but less bass extension.
Thanks for doing that X,

learning all the time
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Old 26th September 2013, 11:39 PM   #1045
Coen is offline Coen  Netherlands
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Quote:
Originally Posted by xrk971 View Post
It's fast because the model is built and I have a database of 100+ drivers on hand that I have created over time. So no problem to help. I have not tried the W4-1052SDF but I know Prezden has tried the W3-1320SIF and he really likes the sound of it. This one is similar but has poly cone and higher Qts which will give a slightly better bass extension. If you want a sure thing, you can't go wrong with the 1320SIF Bamboo paper cone. No need for fancy drivers with Nd magnets - which will tend to have a more powerful motor with lower Qts and not as deep bass extension for the same fs.

I agree with Cal that wood channels will not sound better - the foam may actually have beneficial acoustic damping effects.

Here is the W4-1879 in a 27.55 in x 5 in deep Cornu - very similar to the lower priced W4-1052SDF, but less bass extension.
Well the driver hunt it still on then. Noticed the W4-1052 is a 4ohm driver, my amp is a 6/8ohm one so i'd rather just stick to 8 ohm drivers. Think the W4-1320Sif will be better then the W3? It has a 0.36Qts.
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Old 27th September 2013, 12:48 AM   #1046
xrk971 is offline xrk971  United States
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My mistake I meant Prezden tried the W4-1320sif bamboo. I would go with that driver, as Prrzden said, it is perhaps the best sounding speaker he has heard and he has built 4 Cornu's.
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Old 27th September 2013, 08:38 PM   #1047
Coen is offline Coen  Netherlands
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Quote:
Originally Posted by xrk971 View Post
My mistake I meant Prezden tried the W4-1320sif bamboo. I would go with that driver, as Prrzden said, it is perhaps the best sounding speaker he has heard and he has built 4 Cornu's.
Well i was hoping to try something new, how about this 4.5 inch one:

REVC 7.2 Ohm
Fo 65.40 Hz
Sd 5.02 K mm/2
Vas 5.17 Ltrs
Cms 1.44 uM/N
Mmd 3.90 g
Mms 4.10 g
BL 4.20 T*M
Qms 2.66
Qes 0.69
Qts 0.55
Levc 32.44 uH
No 0.20%
Spl 85.4 dB
Pwr 20w Nom.
X max 4.3-mm 1 way
Coil Dia 20-mm

on the other hand if the ff125wk or the w4-1320 are simply the best there are for the 70/80 cm cornu i might as well pick one of those..
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Old 27th September 2013, 09:07 PM   #1048
xrk971 is offline xrk971  United States
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Coen,
What brand and model of driver is that? Looks like a CHR70.
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Old 27th September 2013, 09:28 PM   #1049
Coen is offline Coen  Netherlands
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Originally Posted by xrk971 View Post
Coen,
What brand and model of driver is that? Looks like a CHR70.
you just scored 10 points :P
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Old 27th September 2013, 09:36 PM   #1050
xrk971 is offline xrk971  United States
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the 4.1 mm xmax gave it away - an unusual figure that my brain happens to remember.
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