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-   -   One 15" Tapped Horn vs Four 8" Tapped Horns (http://www.diyaudio.com/forums/subwoofers/229311-one-15-tapped-horn-vs-four-8-tapped-horns.html)

Patrick Bateman 4th February 2013 07:59 AM

One 15" Tapped Horn vs Four 8" Tapped Horns
 
I have a 'clone' of a Danley TH-Mini which I'm really happy with. My only real gripe is that it doesn't play as low as it's big brothers.

In this thread I want to explore if it's possible to get a response shape and output level that's similar to Danley TH-115 using two tens.

http://i8.photobucket.com/albums/a20...nM/BA218-3.jpg
http://www.shopautoimage.com/store/i...D2-500x500.jpg


Here are the specs on our two candidates:
Driver: B&C 15TBX100 or Alpine SWS-10D2
Fs: 35hz / 35hz
VAS: 107.6L / 25L
QMS: 5.2 / 7.54
QES: 0.3 / 0.52
QTS: 0.28 / 0.49
SD: 855 / 333
XMAX (mm): 9 / 15
Displacement (L): 0.7695 / 0.5
Cost: $299 / $95

Patrick Bateman 4th February 2013 08:01 AM

Ack.

I just realized the title of this thread is wrong. I'd originally considered the Alpine SWR-823D, but switched to the newer and cheaper SWS-10D2 because it's about the same price but has more displacement and plays lower.

So, thread title is wrong.

Patrick Bateman 4th February 2013 08:30 AM

http://img264.imageshack.us/img264/8...ieditedfl3.jpg
https://lh5.googleusercontent.com/-m.../th-115-01.jpg

For the Danley TH-115, assuming that the folding is fairly similar to the first pic, then the simulated response will look something like the second pic. The specs assume that the driver is the $299 B&C 15TBX100. The enclosure appears well designed; as long as you use a high pass at 35hz the driver reaches it's mechanical limits at the same point that it's reaching it's thermal limits.

Patrick Bateman 4th February 2013 08:33 AM

http://img.zmarchive.com/at.p5?f=psw-srf&aId=5006

Here's the measured response of a 'real' TH-115.

Some observations:

1) Response seems consistent with the Danley spec sheet
2) arraying the tapped horns smooths out the dip at 120hz and flattens out the response

Patrick Bateman 4th February 2013 08:49 AM

Haha, this thread is comically anti-climatic!

A couple of the Alpines perform virtually identical to a single 15TBX100. Here's the sims:

https://lh4.googleusercontent.com/-1.../th-115-02.jpg
In this sim of the 15TBX100 versus a pair of the Alpine 10s, we see that the response shape is virtually identical. Basically the horn is dictating the response shape, for the most part. The Alpine is a little bit peakier, due to lower motor force. But it's not as bad as you might expect, because the VAS of the Alpine is so low.

https://lh4.googleusercontent.com/-B.../th-115-03.jpg
Here's the excursion chart. We see that the 15TBX100 has lower displacement than a pair of Alpines. But the Alpines have more than 50% higher xmax, and the Alpines have a beautifully flat BL curve:

http://cdn.avsforum.com/f/f0/525x525...tach244005.png

Did I mention these woofer are available all over the world, can be found for under $100 here in the states?

454Casull 4th February 2013 12:33 PM

In terms of extension vs cabinet volume, TH doesn't have much of an advantage over ported, right? Only in efficiency?

m R g S r 4th February 2013 01:23 PM

There's a wireframe of the folding of the TH115 on danleys site.

turbodawg 4th February 2013 03:09 PM

You need to design and build a proper high output ported sub.

KaffiMann 4th February 2013 04:46 PM

Quote:

Originally Posted by 454Casull (Post 3355367)
In terms of extension vs cabinet volume, TH doesn't have much of an advantage over ported, right? Only in efficiency?

I am not entirely convinced any one design is better than others, a lot of variables count in each and every application.

But the advantage I've seen in my own attempts at stuff like this is that:
1. The volume of a horn or TL type enclosure is not in adittion to the port volume, slight advantage.
2. Vent noise and air speed can be easier to manage because of larger a2 and continous/better planned transitions.
3. In my experience, bracing and stiffening a horn/TL type of design is easier, you can make the braces part of the design.

:knight:
:firefite:

ghettosynth 6th February 2013 03:02 PM

Quote:

Originally Posted by Patrick Bateman (Post 3355194)
Haha, this thread is comically anti-climatic!

A couple of the Alpines perform virtually identical to a single 15TBX100. Here's the sims:

A few questions.

1) Is there a chance I could get you to post your hornresp parameter screen for the alpine(s).

2) From what I've read here and elsewhere, car audio subwoofers are not really suitable for PA gear owing to inefficiency. That said, at this point, I don't really understand the details so this isn't an assertion, rather, I'm asking what makes a car woofer like this suitable for such applications?

3) How would you wire such a speaker for pro-audio applications. Would you simply connect the coils in series for a 4 ohm load?

tnx,
gs


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