One 15" Tapped Horn vs Four 8" Tapped Horns - diyAudio
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Old 4th February 2013, 07:59 AM   #1
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Default 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.

Click the image to open in full size.
Click the image to open in full size.


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
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Old 4th February 2013, 08:01 AM   #2
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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.
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Old 4th February 2013, 08:30 AM   #3
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Click the image to open in full size.
Click the image to open in full size.

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.
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Old 4th February 2013, 08:33 AM   #4
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Click the image to open in full size.

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
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Old 4th February 2013, 08:49 AM   #5
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Haha, this thread is comically anti-climatic!

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

Click the image to open in full size.
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.

Click the image to open in full size.
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:

Click the image to open in full size.

Did I mention these woofer are available all over the world, can be found for under $100 here in the states?
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Old 4th February 2013, 12:33 PM   #6
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In terms of extension vs cabinet volume, TH doesn't have much of an advantage over ported, right? Only in efficiency?
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Old 4th February 2013, 01:23 PM   #7
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There's a wireframe of the folding of the TH115 on danleys site.
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Old 4th February 2013, 03:09 PM   #8
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You need to design and build a proper high output ported sub.
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Old 4th February 2013, 04:46 PM   #9
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Quote:
Originally Posted by 454Casull View Post
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.


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Old 6th February 2013, 03:02 PM   #10
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Quote:
Originally Posted by Patrick Bateman View Post
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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