Volvotreter 20Hz Tapped Horn build (pics) - diyAudio
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Old 18th March 2010, 06:27 AM   #1
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Default Volvotreter 20Hz Tapped Horn build (pics)

After perusing what would be an nice compliment to my [main speakers], and satisfying all criteria for movie and music listening for subwoofer duty given my apartment, I've decided to give the 20Hz TH a shot. I've built a couple cabs of Bill Fitzmaurice design (with excellent results), but this DIY project is most appropriate shown here in this forum. Test fitting and assembly is under way! More photos to come...
Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.

-Radian

Last edited by RadiantNRG; 18th March 2010 at 06:41 AM.
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Old 18th March 2010, 01:41 PM   #2
siqdiz is offline siqdiz  Netherlands
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What driver are you planning to use?
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Old 18th March 2010, 01:44 PM   #3
oublie is offline oublie  United Kingdom
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Now this is interesting.

Have you by any chance built the Bill fitzmaurice THT? I would love to see your comparisons between it and a tapped horn using the same driver.

ATM i'm sitting here with the BFM plans for the THT but i have two of the drivers used in these plans so i would like to see how a 20hz tapped horn compares.
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Old 18th March 2010, 06:40 PM   #4
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I'll be going with the 3015lf. I'm trying to keep it light weight, as the sub will be parked in front of a small door that provides maintenance access to our furnace. The filter gets changed every six months, so I wanted the cab light enough that the GF can shuffle it out of the way if need be.

I've not had a chance to build the THT yet. Although, I have the drivers on deck to do so when that time comes. I have built several AT's and a Table Tuba. With thanks to Ultra Fidelis and a visit to DSL, I've also had the pleasure of hearing all sorts of high-zoot commercially available subs the like of SVS, TH50, DTS-20, JL...etc.

My desires were for a DIY cab with minimal horizontal footprint, was horn loaded, went down to at least 25hz with some authority for movie watching, and had good prints to work from.

You simply can't go wrong with the THT if you have the space for it. It's insane (just check out youtube). The Table Tuba I built for my parents' HT setup is crazy and it's a third narrower than the THT.
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Old 19th March 2010, 05:05 PM   #5
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I've been wanting to build one of these as well. I currently have a THT and was wondering what the comparison would be like. I also built 2 of volvotreters 38hz tapped horn with the 6.5 tangband in my office, them suckers really sound nice.
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Old 20th March 2010, 04:04 AM   #6
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Alright, first brace glued into its dado and side panel cleats glued on. These cleats stiffen up the side panel as the span from the baffle to the outer panel increases along the length of the cab. Was this a must? No, but it sure makes for a rock solid cab when working with 1/2" ply. Will it affect performance? Not enough for me to fret over, and not over any frequencies that I'd care about.
Attached Images
File Type: jpg 20HZTH1.jpg (82.1 KB, 229 views)
File Type: jpg 20HZTH2.jpg (77.0 KB, 160 views)
File Type: jpg 20HZTH3.jpg (82.1 KB, 157 views)
File Type: jpg 20HZTH4.jpg (119.1 KB, 166 views)
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Old 20th March 2010, 04:38 AM   #7
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I've got pictures sorted out now, so here's bigger versions of the dry fitting pics from the first post. -Cheers
Attached Images
File Type: jpg 20HZTH5.jpg (77.3 KB, 196 views)
File Type: jpg 20HZTH6.jpg (90.4 KB, 123 views)
File Type: jpg 20HZTH7.jpg (85.9 KB, 128 views)
File Type: jpg 20HZTH8.jpg (82.2 KB, 174 views)
File Type: jpg 20HZTH9.jpg (97.5 KB, 188 views)
File Type: jpg 20HZTH10.jpg (83.3 KB, 197 views)
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Old 21st March 2010, 02:40 AM   #8
zobsky is offline zobsky  India
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what type of ply is that ?
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Old 21st March 2010, 02:56 AM   #9
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The baffle is 3/4" 7-ply ACX, the outer panels are 5-ply ACX, bracing is 3-ply 1/4" ACX, and the cleats are 3/8" birch.
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Old 21st March 2010, 04:46 AM   #10
zobsky is offline zobsky  India
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Quote:
Originally Posted by RadiantNRG View Post
The baffle is 3/4" 7-ply ACX, the outer panels are 5-ply ACX, bracing is 3-ply 1/4" ACX, and the cleats are 3/8" birch.

Thanks, I thought that looked like Arauco ACX.
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