Alpine R-W12D4 Help!

[Brian36]

Hello, I've just joined this forum as I'm wanting to build a new enclosure for the Alpine subwoofer I have. It will be going into my home theater set up but I'm not sure what will be the best possible route to get started on. I would like to build a transmission line style enclosure but I need to find out how and where to get the perfect measurements to get the best from the speaker. Failing that I can either have a ported or sealed box but I'm not sure which is going to give the best bass for my efforts. So where is the best place to get dimensions for a good enclosure?

Here's some of the speakers parameters

SPL = 84.7 dB
Re = 3.6ohms + 3.6ohms
Le = 4.46 mH
Fs = 28 Hz
Vas = 48 L
Qms = 7.15
Qes = 0.61
Qts = 0.56
Sd = 479 cm²

Thanks in advance

 

[mordikai]

Maybe ask for a recommendation on the Facebook diy transmission line group. They are pretty capable in a standard enclosures so I’d model them up in a standard ported enclosure and a sealed one with some eq.

 

[Brian36]

Thank you for your input, I really appreciate it! I decided I'll just go with a ported enclosure as I stumbled across a site last night which gave me all the measurements and information I was needing to get something made up. I'll leave the transmission line speakers for my next project and build up all the information I need to get the transmission ones perfect.

 

[Brian Steele]

Just make sure that the information at the site is not for a car audio subwoofer. A home audio subwoofer using this driver would likely call for a larger box and lower tuning (something around 2.5+ cu.ft. net tuned to under 28 Hz).

 

[GM]

Hello, I've just joined this forum as I'm wanting to build a new enclosure for the Alpine subwoofer I have. It will be going into my home theater set up but I'm not sure what will be the best possible route to get started on. I would like to build a transmission line style enclosure but I need to find out how and where to get the perfect measurements to get the best from the speaker. Failing that I can either have a ported or sealed box but I'm not sure which is going to give the best bass for my efforts. So where is the best place to get dimensions for a good enclosure?

Here's some of the speakers parameters

SPL = 84.7 dB
Re = 3.6ohms + 3.6ohms
Le = 4.46 mH
Fs = 28 Hz
Vas = 48 L
Qms = 7.15
Qes = 0.61
Qts = 0.56
Sd = 479 cm²

Thanks in advance

Greets!

Driver specs aren't real critical for TLs, so published is normally fine, but obviously need to measure your own if you want the most accurate.

Anyway, did a simple 20 Hz pipe TL for the R-W12D2 awhile back, so loaded these specs and looks fine to me, though between driver size, low tuning is quite large at 372 cm long, ~409 L.

A TQWT is 313 cm long, ~241 L.

Both Xmax limited to ~250 W.

GM

 

[mordikai]

I have not modeled the D4 but my D2 is great in a 3cu. ft. tuned to 20hz, powered with a 1000 watt plate amp with an 18hz high pass. As good as any 12" sub I've had.

 

[Brian36]

Thanks for the information guys, it's given me more to think about as I was just going to go with the reccomended manufacturer specs of a enclosure with a 1.71cu. ft. And tune it to around 35hz? As I will be using the sub for our home system so it will need to cope with a wide variety of different films and music. Now I'm not sure what size to go for haha.

 

[mordikai]

download winisd beta (the free one) and start modeling. You load in the parameters and off you go. For movies and music I'd go with a larger box and lower tuning than what you've stated above, that is certainly an alignment meant for car audio.

 

[Brian36]

Awesome thanks for the help, I'm sure I'll throw something together and see how it turns out

 

[mordikai]

Here are a couple of sims. Really digs deep, even sealed is not bad imo.