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Old 26th February 2012, 04:19 PM   #141
tb46 is offline tb46  United States
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Hi permo,

"...May have to build something even nastier and bigger for downstairs. Although I don't know why I would need it."

That's always the question, isn't it. Maybe read through this thread, it's not finished yet, but the Epic 12" is one stout woofer.

Regards,
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Old 26th February 2012, 10:09 PM   #142
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by permo View Post
I know that bass is bass, but and that the term "quick" or "fast" doesn't make technical sense, but this TQWT has an amazing sound. Like nothing i have ever heard. I can see how this kind of ease and output could be addicting.
A well executed DIY job is always rewarding...

Quote:
Now....if only I knew how to design them myself!
In time grasshopper,in time...

Quote:
The one in the picture is upstairs in my house, it's supposed to be temporary as my main listening room is being build downstairs. I have a feeling I am not going to want to part with it. May have to build something even nastier and bigger for downstairs. Although I don't know why I would need it.
Why not involve SWMBO to camouflage your creation: Picture example:

Quote:
I have been seeing what this thing can do this morning, and clearly this thing is capable of massive amounts of low frequency output in my room. I had to turn it down on a few tracks well before maximum output just for the safety of my ears and so my house would stop rattling. crazy!
Time to renew the House insurance?

Quote:
Also, although it hurt my ears a lot, I took a look in the throat while the speaker was putting out considerable bass. Hardly any air coming out and the speakers barley moving. Talk about making a lot of sound out of minimal excursion.
Your sub is a point-source pressure device, the T-TQWT internal air volume velocity is converted into pressure at the port,wasting very little power to sweep the floor in front of the terminus if you have an adequate HPF.

Quote:
thanks so much for the help guys! I love it.
Oliver is the one who should recieve credits for this design: My contribution is if compared with his IMO very modest..

b

PS: The potted-plant placed on top of the enclosure is an Hoya...needs little water and a share of double-bass music in order to flourish.
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Old 27th February 2012, 12:14 AM   #143
tb46 is offline tb46  United States
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Hi Y'all,

Love the potted plant :-).

Apparently the dog ate my link in Post #141, so here it is: Suggestions Creating Subwoofer Box(s) - 56 cuft available

Regards,
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Old 27th February 2012, 01:39 PM   #144
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Quote:
Originally Posted by bjorno View Post
A well executed DIY job is always rewarding...



In time grasshopper,in time...



Why not involve SWMBO to camouflage your creation: Picture example:



Time to renew the House insurance?



Your sub is a point-source pressure device, the T-TQWT internal air volume velocity is converted into pressure at the port,wasting very little power to sweep the floor in front of the terminus if you have an adequate HPF.



Oliver is the one who should recieve credits for this design: My contribution is if compared with his IMO very modest..

b

PS: The potted-plant placed on top of the enclosure is an Hoya...needs little water and a share of double-bass music in order to flourish.

I love the pic! I actually think it might be a good idea to add some colorful formica or something of that nature to the front. and figure out what plants love low frequency output.

My next one will surely be built from 3/4 oak or baltic with stain, and varnish and trimmed out. I am thinking more of a big, massive chunk of a rectangle. Something that could double as an end table or ottoman.

I was thinking last night, that I have heard bass of this nature before, and it just came to me. When I was in high school I went to a white zombie concert and I was in the pit. The bass that came from the 100 foot tall wall of speakers/amplifiers was similar. It has that fast, chest thumping impact.

I am completely awestruck at the sound and capabilities of this thing. Additionally, it should be known, that this is with a 150 watt amplifier driving the thing.
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Old 27th February 2012, 01:59 PM   #145
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That feeling is due to the low pressure nature of the wavefront.

The difference is similar to saying "ahh" with your mouth wide open vs blowing through a straw. You move the same amount of air but one couples more effectively to the surrounding air.
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Old 27th February 2012, 02:00 PM   #146
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Originally Posted by tb46 View Post
Hi permo,

Nice work, they look good to me too. How heavy are they?

Regards,

I am guessing well north of 100 pounds. I can't carry it myself. It's right around 1.5 sheets of MDF. Plus the drivers.

My favorite part, is I didn't have to mess with the stuffing at all. Bjorno's diagram had the amount and where to put the stuffing perfectly calculated apparently.
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Old 27th February 2012, 04:05 PM   #147
tb46 is offline tb46  United States
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Hi permo,

Post #144: "...I am thinking more of a big, massive chunk of a rectangle. Something that could double as an end table or ottoman."

Interesting that you would say that, I have been sketching around on a T-TQWT that would take a single fold T-TQWT (or even a TH), and fold it again, so that you end up with something looking more like a cube (actually it would still be longer in one direction). Looks like it will come together fine.

Regards,
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Old 27th February 2012, 04:19 PM   #148
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Quote:
Originally Posted by tb46 View Post
Hi permo,

Post #144: "...I am thinking more of a big, massive chunk of a rectangle. Something that could double as an end table or ottoman."

Interesting that you would say that, I have been sketching around on a T-TQWT that would take a single fold T-TQWT (or even a TH), and fold it again, so that you end up with something looking more like a cube (actually it would still be longer in one direction). Looks like it will come together fine.

Regards,

You have my attention? What driver's do you have in mind? I see that PE has the dayton audio classic 15 on special!
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Old 27th February 2012, 08:18 PM   #149
tb46 is offline tb46  United States
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Hi permo,

I'm still messing around with the 6.5" 299-114 that ODougbo has been using. Here is a link for a similar folding:

The Subwoofer DIY Page v1.1 - Projects : A "Proof of Concept" tapped pipe* - Construction

There seems to be more than one Dayton Classic 15", either way, a 15" will make for a bigger box.

Regards,
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Old 27th February 2012, 08:26 PM   #150
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Quote:
Originally Posted by tb46 View Post
Hi permo,

I'm still messing around with the 6.5" 299-114 that ODougbo has been using. Here is a link for a similar folding:

The Subwoofer DIY Page v1.1 - Projects : A "Proof of Concept" tapped pipe* - Construction

There seems to be more than one Dayton Classic 15", either way, a 15" will make for a bigger box.

Regards,
What a great read! Thank you.

Check this baby out.....

T3 Audio T400-12D4 12" 400 Watt Dual Voice Coil Subwoofer 269-087
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