Tang Band W4-2142 4" Paper Cone Full Range Driver 8 Ohm

[IRONHAND54]

I want to build a MLTL with the external dimensions of 39"H X 6"W X 6 3/4" D with this driver. I have some 2" ports that are 4" long. Given the cabinet dimensions what would be the port length for a 40 HZ bottom end? Port will be 3" from the bottom? I have a half of a sheet of 1/2" plywood left over from a previous build, so this is an idea to do away with the leftovers?

Here's the Spec's:

Thiele-Small Parameters
Resonant Frequency (Fs)60 HzDC Resistance (Re)6.3 ohms
Voice Coil Inductance (Le)0.022 mHMechanical Q (Qms)2.2
Electromagnetic Q (Qes)0.39Total Q (Qts)0.33
Compliance Equivalent Volume (Vas)0.22 ft.³Mechanical Compliance of Suspension (Cms)1.52 mm/N
BL Product (BL)5.41 TmDiaphragm Mass Inc. Airload (Mms)4.61g
Maximum Linear Excursion (Xmax)2.4 mmSurface Area of Cone (Sd)54.3 cm²

Product Specifications
Nominal Diameter4"Power Handling (RMS)25 Watts
Power Handling (max)50 WattsImpedance8 ohms
Frequency Response60 to 20,000 HzSensitivity88 dB 1W/1m
Voice Coil Diameter1"

Thanks,
Mac

 

[xrk971]

Usually the volume of the MLTL is set by the driver Vas and desired tuning frequency. So if you like that height and width, adjust depth to get volume correct. We can model this with various TL models/codes. Or you can try the AMLTL method. Use a bass reflex program to calculate the volume and vent dimensions. Then put driver 1/3rd from closed end. The vent location can also be optimized but circa 3in from bottom usually works. Out stuffing in top third and line 2 walls with felt. This usually works well for drivers with Qts around 0.45 to 0.65.

http://www.diyaudio.com/forums/full-range/231951-accidental-mltl-technique.html

 

[IRONHAND54]

Usually the volume of the MLTL is set by the driver Vas and desired tuning frequency. So if you like that height and width, adjust depth to get volume correct. We can model this with various TL models/codes. Or you can try the AMLTL method. Use a bass reflex program to calculate the volume and vent dimensions. Then put driver 1/3rd from closed end. The vent location can also be optimized but circa 3in from bottom usually works. Out stuffing in top third and line 2 walls with felt. This usually works well for drivers with Qts around 0.45 to 0.65.

http://www.diyaudio.com/forums/full-range/231951-accidental-mltl-technique.html

That's why I asked this question, because I have tried to use the modeling software, and I come up with a bunch of wild a__ dimensions and port lengths. I was hoping one of you guy's would plug in my numbers to your program, and give me a port length? I planned on the driver 1/3 of the way down the cabinet & port 3" from the bottom. I was hoping the cabinet dimensions would work, as it will achieve the use of all the leftovers.

Thanks,
Mac

X, I wish I was smarter with modeling software, but I am not!😕

P.S. I can do taller/shorter height, but would like to keep W&D as is?

 

[Inductor]

Hi guys,
I can give you a modeled enclosure for the driver, but I'm not used to TL's or 1/4 waves just for the sim (sorry for being in French). Maybe other members can give you a better design.😀
Tang Band W4-2142 4" Paper Cone Full Range Driver 8 Ohm

 

[perceval]

Like X mentioned, MLTL, as I have experienced at home as well, works best with a driver of Qts between 0.45 to 0.65.

Anything lower, or higher, didn't work so well when it came to bass resolution and extension.

The W4-2142 at 0.33 is a bit on the low side.

 

[IRONHAND54]

Well gang the reasons I stated for the build in the previous post were to improve upon the Modified TABAQ I built using the TB W3-2141 Bjorn simmed for me. I was so taken back by the end result of that build that I figured the W4-2142 would be even better! BTW the W3-2141 VAS was only 0.39, so you figure? Can't and won't never did anything sooo, I was hoping one of my bud's on here would plug my numbers in to their modeling software and see what's up?

Thanks,
Mac

 

[IRONHAND54]

Just talked to the Tech support guy @ PE, and i will build this cabinet with the Tang Band W5-2143 versus the W4-2142. The 5" driver will work well with my cabinet dimensions, and should be a winner at the finish line. Thanks to all you guys who chimed in to help me.

Thanks,
Mac🙂

 

[xrk971]

Here are sims for the W4-2142.

As specified with 6in x 6.75in x 39in and 2in dia x 4in vent the cabinet is too big for the Vas and the tuning too deep - you will have very unbalanced response and it will sound anemic. With room gain, you may be able to pull up by corner placement, but far from walls this is what you will get without any BSC:

The above has treble that is almost 10dB greater than bass. If you heavily BSC it, the overall sensitivity will be about 78dB and have a saddle in the mid bass.

If you make the size much smaller at 5.5in wide x 4.5in deep x 31in tall and 2in dia x 3.5in duct and 6ohm+1.2mH BSC, you will get 63Hz tuning more appropriate for the driver and balanced 83dB sensitivity that will sound much better:

For the W5-2432, the cabinet is much more appropriate and just change vent to 2.5in dia x 3in long for 54Hz tuning, add a 1.25mH+7ohm BSC for an overall 85dB sensitive system with much more well behaved bass response:

Hope that helps and let us know how it works once you build it.

p.s., I would even suggest making the vent only 2.25in long for 57Hz tuning on the W5 to get a nicer bass response - 86dB, reduce BSC resistor to 5ohms:

 

[IRONHAND54]

Thanks X, for all the wonderful Sim work you did to help me in this endeavor! I even thought of the TB W5-2143 going into a TABAQ Large, as Bojorn designed for some Scandinavian audio enthusiast. This set of speakers is going to be a gift for my son, and I may just really go off the deep end and buy a pair of Alpair 10M.3's and do a Pencil build? There are so many options in our forums, thanks to all you guys, and it's just a matter of picking your poison, so to speak! Ha Ha! 🙂

Mac

 

[theaspin]

W5-2143 won't work in TABAQ due to lower Qts. Have a look at W5-2106 instead.

 

[xrk971]

Thanks X, for all the wonderful Sim work you did to help me in this endeavor! I even thought of the TB W5-2143 going into a TABAQ Large, as Bojorn designed for some Scandinavian audio enthusiast. This set of speakers is going to be a gift for my son, and I may just really go off the deep end and buy a pair of Alpair 10M.3's and do a Pencil build? There are so many options in our forums, thanks to all you guys, and it's just a matter of picking your poison, so to speak! Ha Ha! 🙂

Mac

You are welcome. You have a decision to make: the MLTL or a K'nator for the 2143.