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-   -   12" woofer advice (http://www.diyaudio.com/forums/multi-way/12289-12-woofer-advice.html)

Duck-Twacy 11th March 2003 04:25 PM

12" woofer advice
 
Hi.
Which 12" woofers would be best for a 60-70 liter BR enclosure in a (active) 3 way speakersystem?

I'm thinking of:
Focal 13W8711
Focal 13K8711
Alcone AC12SW-8 (bit afreight 300 Hz is too high for this one)
Davis 31TCA12W
Visaton TIW360X
Eton 12-680/62HEX

The mid is a 5" focal Kevlar unit (91 dB/w) which should take over around 300 Hz. The bass amp wil be a 50 watt Plinius, so the efficiency of the unit should be good (> 89 dB/w).

What are the pros and cons of these units. What units should I also consider?

Brookeville 12th March 2003 03:57 AM

Hey, Duck-Twacy, try this link and have some fun building your sub!
http://www.snippets.org/ldsg/sect-8-woofs.php3#WOOF-15-

Good Luck, :nod:
Stan

Duck-Twacy 12th March 2003 06:56 PM

Thanks for that link.

Btw it is for a 3 way system, not a sub. It should be capable to do 30-300 Hz (at least).

This one looks very interresting
http://www.flexunits.com/

Quote:

Flex Unit 12 B 77 25 10
Effective Cone Area 515 Cm2
Nominal Impedance 8 Ohm
Resonance Frequence 25 Hz
Equivalent Air Volume 250 Ltrs.
Mecanical Q Factor 2.5
Electrical Q Factor 0.34
Total Q Factor 0.3
Acceleration Factor 203
Nominal Power Handling 250 W
Sensitivity 92 dB
Frequency response 28-1800 Hz
DC resistance 5.4 Ohm
Compliance 0.6733 mm/Nm
Mechanical res. 3.782
VC inductance 0.76 mH
Moving mass 60.20 g
Force factor 12.24
Linear excursion (x-max) 8.6 mm
Max. excursion (P-P) 48 mm

http://www.flexunits.com/images/units/12.jpg

Probably a bit expensive...

Duck-Twacy 15th March 2003 03:40 PM

I requensted the prices of the FlexUnits (you can buy them directly from the manufacterer)

Here the prices for the default units (a piece, in euro):
4" 179
5" 199
6" 277
8" 316
10" 382
12" 424 (77 mm v.c. 170*24 mm magnet)
15" 585 (102 mm v.c. 220*22 mm magnet)

You can choose another size for the voice coil and magnet,
e.g a 12" with a 102 mm v.c. and 200*24mm magnet costs 480.

discounts:
3 - 10 15%
11 - 50 20%
51-100 25%
etc.

I think the cost is reasonable compared to the Focal Audiom range.

With these speakers you can chose the T?S parameters yourself!

thylantyr 15th March 2003 05:31 PM

Re: 12" woofer advice
 
The Lambda TD series is a great
driver for your application, you might
even consider the TD15 instead
of the TD12 since the prices are
almost the same (march sale).

$169 for TD12
$179 for TD15

http://www.lambdacoustics.com/drivers/TDdrivers.html

I chose the lowest Q version of TD, so
in my case I bought TD15H.

http://www.lambdacoustics.com/

The LE version is not recommended
for you application.

Post #8 and beyond.
http://www.diyaudio.com/forums/showt...threadid=11858

Duck-Twacy 16th March 2003 08:46 PM

Thanks for the tip (i'm affraid cost after import to holland wil be $100 or more higher).

Btw anybody any comments on this Hi-Vi M12 unit:
http://swanspeaker.com/products/drivers/M/m12/m12_1.htm

Quote:

Nominal Impedance (Z)() 4
Resonance Frequency (Fs)(Hz) 27
Nominal Power Handling (Pnom)(W) 150
Sensitivity (2.83v/1m)(dB) 93
Weight (M)(Kg) 8.0
VC Diameter (mm) 50 SV
DC (Re)() 3.4
VC Length (H)(mm) 24.3
VC Former Kapton
VC Layers 2
Magnet System Outside Ferrite
Force Factor (BL)(TM) 16.8
Gap Height (He)(mm) 10
Linear Excursion (Xmax)(mm) 7.2
Suspension Compliance (Cms)(uM/N) 203.2
Mechanical Q (Qms) 4.87
Electrical Q (Qes) 0.36
Total Q (Qts) 0.33
Moving Mass (Mms)(g) 161.5
Effective Piston Area (Sd)(m2) 0.0531
Equivalent Air Volume (Vas)(L) 81.4
Vented Box Vb=40L,Fb=35Hz
F-3=35Hz
It should give 36 Hz@-3 dB in a 42 liter enclosure. Is it any good??

planet10 17th March 2003 01:59 AM

Quote:

Originally posted by Duck-Twacy
Thanks for the tip (i'm affraid cost after import to holland wil be $100 or more higher).
But you would still be in for less cash than the Skanning. BTW the fellow at Skanning is one of Nick from Lambda's hereos, and the 2 brands probably represent some of the very best drivers you can buy.

dave

Duck-Twacy 17th March 2003 07:53 AM

Quote:

Originally posted by planet10


But you would still be in for less cash than the Skanning. BTW the fellow at Skanning is one of Nick from Lambda's hereos, and the 2 brands probably represent some of the very best drivers you can buy.

dave

Hi Dave,
My mail was answered by Per Skaaning, his father Ejvind Skaaning I understood is the founder of Dynaudio and Scan-speak, so I guess the units are the best.

Btw I looked at the Lambda PB12, thats a great driver. It should give 32Hz@-3dB in a 60 liter enclosure. Efficiency is a bit lower (88.6 dB/w). Still very interresting.

Also the Seas W26FX001 looks promissing, it gives an F3 of around 25 HZ in a 90 liter box. Its only 10" ofcourse (and 350 euro a piece).
Chosing a driver is not easy ;)

I like youre TL site.
Ronald.

planet10 17th March 2003 08:09 AM

Quote:

Originally posted by Duck-Twacy
My mail was answered by Per Skaaning, his father Ejvind Skaaning I understood is the founder of Dynaudio and Scan-speak, so I guess the units are the best.
That is true. It is to a large extent his work that brings us the best motors.

Quote:

I like youre TL site.
Thanx

dave

Duck-Twacy 17th March 2003 08:31 AM

Btw I have some very old mags with discriptions of some TDLs (Monitor Compact and RSTL). In German I'm affraid (Klang&Ton).

If you're interrested I could try to scan them.

Maybe this site is also usefull http://www.aos-lautsprecher.de/


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