Ultra compact ported 15" Dayton Ref HO - Page 7 - diyAudio
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Old 6th December 2012, 05:50 PM   #61
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I'll post an update when there is something worth posting. Your questions are answered elsewhere in the thread.
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Old 20th December 2012, 03:56 PM   #62
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Finally got my custom splitter cables made up to go from the USB interface (1/4" TRS) to the sub amp (XLR) and eq for the mains (RCA), so all the electonics for the system are setup. Ran the single sub, however, I have no way to combine R/L channels into one output channel, there's no way to do it in the amp. Overall sounds very, very good, quite powerful without overloading anything, clean etc. Box seems to be handling the woofer quite nicely - it's a light box (sitting on a blanket right now), so the whole thing moves/vibrates a bit, but the panels themselves don't really flex. It will be more solid with proper feet and main speaker pole mounted on top of it, but I may consider a way to add a weight on top. The port seems to flow quite well and has only minor chuffing going full tilt at tuning, the air is moving quite quickly for a vent that's equivalent to a 7" pipe.

Ran some sweeps and set a 26hz 8th order high pass based on observed woofer excursion, I'm getting usable response to a bit below 30hz. Max excursion so far in the passband looks to be about 8mm-ish each way, at around 28-30 hz and 45-50hz, so the woofer is not maxed out but neither was the amp, was getting the 3rd indicator light to flash on. Woofer cone got a hair above ambient.

Now I just need to build another box, add a few more braces inside the baffle, mount the grill, internal damping, paint, hardware, get some poles.....and modify the main speakers. So about half way in the build phase, but it should go a bit quicker now because I've pretty much made all design decisions by now.
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Last edited by turbodawg; 20th December 2012 at 04:04 PM.
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Old 5th January 2013, 02:54 PM   #63
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Bump, have the 2nd sub build underway making quick progress, hope to have the pair up and running together some time this weekend. Looking forward to getting a better impression of what the pair is capable of.
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Old 5th January 2013, 03:48 PM   #64
maxo is offline maxo  United States
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Nice turbo!!
waiting on your findings !!!
Max.
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Old 5th January 2013, 06:17 PM   #65
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Quote:
Originally Posted by turbodawg View Post
SNIP....
Box seems to be handling the woofer quite nicely - it's a light box (sitting on a blanket right now), so the whole thing moves/vibrates a bit, but the panels themselves don't really flex. It will be more solid with proper feet and main speaker pole mounted on top of it, but I may consider a way to add a weight on top.SNIP...
I built a sub that although had a very stiff box it was moving aroung.
I ended up using 4 rubber feet mounted with 1/4"-20 hurricane nuts.

These McMaster-Carr
I used stock number 8926T21 (the first one listed) mainly because I had 10 of them sitting around.
The sub still vibrates a little but it doesn't make any bad noises from doing so.

Dave
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Old 5th January 2013, 06:46 PM   #66
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Quote:
Originally Posted by Shadydave View Post
I built a sub that although had a very stiff box it was moving aroung.
I ended up using 4 rubber feet mounted with 1/4"-20 hurricane nuts.

These McMaster-Carr
I used stock number 8926T21 (the first one listed) mainly because I had 10 of them sitting around.
The sub still vibrates a little but it doesn't make any bad noises from doing so.

Dave
I have five penn-elcom F1687 rubber feet for each sub which should be pretty solid, they are 1.5" x .375".

Penn-Elcom F1687 Rubber Cabinet Foot 1-1/2" Dia. x 3/8" H 260-777

I'm also thinking about adding a lip below the slot port that will directly contact the floor. This will provide better floor coupling by not letting sound radiate directly out of the port to under the sub.
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Old 5th January 2013, 09:59 PM   #67
maxo is offline maxo  United States
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Have you braced the internal panels enough to prevent any vibration and flexing ?
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Old 7th January 2013, 03:26 AM   #68
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Got the second up and running.

Nasty.
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Old 7th January 2013, 03:52 PM   #69
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What tops were u using with these again?
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Old 7th January 2013, 07:09 PM   #70
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Originally Posted by m R g S r View Post
What tops were u using with these again?
Right now I have them paired to some klipsch cf-1's that are pretty much stock except for some added internal bracing. Mains are on top of the subs, roughly physically aligned driver accoustic centers. Sub low pass is first order around 150hz, mains have the bass cut with a parametric EQ set to minimum Q, maximum cut and ~40hz center.

The PA mains are peavey impulse 100 I got NOS off ebay. Have them apart, going to dynamat them internally, add some braces, better stuffing, speakon connectors, seal the baffles etc.
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