Hello, my name is David. I've spent some years in mobile audio, but lately I've been taking on quite a few home audio projects. I recently built my first folded horn for my moms car (attached pictures). Designed for a single 10" driver I just kind of guessed on the dimensions of the horn end, and
was quite impressed it out performed her previous 2X12" ported box. My dilemma is I expected more and it had a nasty dead spot below 40Hz or so.
Now it's time to build one for my living room about 20'X20' (6 X 6 meters) using another single 10". The driver requires just .8 cubic feet (.022 cubic meters) for the sealed end of the box. I'd like to put it in a corner standing as upright as possible. I am willing to go as high as 6-8 feet (2-2.5 meters) and 24-36 inches (600-900mm) deep but The problem is, just as the first project, I cannot find any plans for single 10" folded horn woofers, I luckily found your site and would greatly appreciate any assistance you could offer.
P.S. Don't even bother with conversions of measurements, I can do all of that, I'm more than thankful for your time and wouldn't want to further complicate the situation.
Sincerely appreciative, David.
djdaveysprocket@yahoo.com
was quite impressed it out performed her previous 2X12" ported box. My dilemma is I expected more and it had a nasty dead spot below 40Hz or so.
Now it's time to build one for my living room about 20'X20' (6 X 6 meters) using another single 10". The driver requires just .8 cubic feet (.022 cubic meters) for the sealed end of the box. I'd like to put it in a corner standing as upright as possible. I am willing to go as high as 6-8 feet (2-2.5 meters) and 24-36 inches (600-900mm) deep but The problem is, just as the first project, I cannot find any plans for single 10" folded horn woofers, I luckily found your site and would greatly appreciate any assistance you could offer.
P.S. Don't even bother with conversions of measurements, I can do all of that, I'm more than thankful for your time and wouldn't want to further complicate the situation.
Sincerely appreciative, David.
djdaveysprocket@yahoo.com
Horns are VERY driver specific.
A. can you post the driver model and/or the T/S parameters of the driver you want to use.
B. have you downloaded HORNRESP to simulate the horn you are looking to build
C. Do you have SPL and frequency response requirements? (aka, 120db@1m@30hz, in a corner)
D. are you looking to build a Front loaded horn, Rear loaded horn, or Tapped horn.
The above info should be enough for others to help you.
A. can you post the driver model and/or the T/S parameters of the driver you want to use.
B. have you downloaded HORNRESP to simulate the horn you are looking to build
C. Do you have SPL and frequency response requirements? (aka, 120db@1m@30hz, in a corner)
D. are you looking to build a Front loaded horn, Rear loaded horn, or Tapped horn.
The above info should be enough for others to help you.
A. you're all going to laugh at me but, the driver is an Alpine SWR-1021D intended for mobile audio, I'm pretty certain it's not ideal but I'm working with a limited budget and happen to have this one sitting around. I am however open to sugestions on purchasing something better if it's affordable.
B. I've been trying to find a version of HORNRESP I can run on my Linux OS, but have yet to find anything.
C. The only specs I can find on this driver are from the factory (attached PDF)
D. I'm not familiar with the different types of horns but this is a visually appealing driver and was hoping to put it at the top of my box facing down, I don't even know if thats possible or ideal for efficiency.
I think an up and back tapped horn ala cowan Tapped Horn Experiments is exactly what you are describing, and actually works with your chosen alpine driver.
This is the hornresp sim for an 8 foot tall up and back, 70cm2 throat and 700cm2 mouth.
You'll need to face the driver 'into' the throat, so the magnet is visible in the mouth.
I think that is workable and would do what you want. It's good down to 25hz, and 300 watts, coils in series for 4ohm.
I believe others have made hornresp work correctly under WINE.
hope this helps.
This is the hornresp sim for an 8 foot tall up and back, 70cm2 throat and 700cm2 mouth.
You'll need to face the driver 'into' the throat, so the magnet is visible in the mouth.
I think that is workable and would do what you want. It's good down to 25hz, and 300 watts, coils in series for 4ohm.
I believe others have made hornresp work correctly under WINE.
hope this helps.
Attachments
Thank you so much jbell, I really like the design you suggest.
I'm super excited to start building, it's my favorite part (besides listening to the finished result). I will post pictures of the process, construction, and finished results.
P.S.
Am I correct to assume that I should be using 3/4" plywood and internal bracing on such a large box?
Thanks again, David
I'm super excited to start building, it's my favorite part (besides listening to the finished result). I will post pictures of the process, construction, and finished results.
P.S.
Am I correct to assume that I should be using 3/4" plywood and internal bracing on such a large box?
Thanks again, David
I'm still a little confused, I've successfully acquired WINE and HORNRESP but I don't understand it one bit.
Also not sure about the 8 foot bit. Is the box 8 feet tall (16 feet of horn), or is it an 8 foot horn folded in half to make a 4 foot box
yep, 8' tall. You said you had 6' to 8' of height. As simmed, it's roughly 12x12x96. That would make a nice slender column in the corner.
If this is too tall, you can double fold it, and roughly double the depth from 12" to 24", and make it about 4' tall.
Specifically Linux users, though OSX also makes this list with a little effort.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Okay it's built, and it sounds amazing, I've never heard so much from a single 10" sub. 
Thank you all for the help!!!
I enclosed pics of the process
I do have one issue though, it seems to be distorting or canceling out at the low end, and I'm wondering if there was some sort of adjustment I could make to remedy the problem, while I was building it I started worrying if I should have taken the area of the back side of the driver into consideration because it is right in the mouth and is quite massive
An externally hosted image should be here but it was not working when we last tested it.
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