Ultra compact ported 15" Dayton Ref HO - diyAudio
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Old 18th September 2012, 01:06 AM   #1
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Default Ultra compact ported 15" Dayton Ref HO

I'm seriously considering going ahead with the build of a small ported 15" Dayton Reference HO for compact PA use.

The model I have going is 2.5 cubes (plus ports, driver) tuned to 37.5 hz with 2x 24"x5" ports, with a bend. Hoping to get into a box around 16x20x20 or so. Has a smooth peak around 45hz. This will be used outdoors as a single sub with a battery powered class-d car amp doing 400 watts into 4 ohms, off large SLA batteries. So the lower end peak seems like a good thing. I get a 95 db/2v/m/2pi peak in hornresp.

One port could be plugged for indoor use providing extension down to 30hz.

I may in the future add a 2nd sub and digital pro audio amp around 800w x 2, for AC use, which would max out the subs.

I have considered horns in detail, but it doesn't seem like they can give the extension in this size package. I've also considered a ported LF pro audio 12", but the HO 15" seems like it has better extension and close enough sensitivity in the same size box, with much more headroom.

I know the driver is very heavy and it will need a solid box, but hopefully I can come up with something that is effective while portable and not overbuilt.

Your thoughts?

Last edited by turbodawg; 18th September 2012 at 01:21 AM.
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Old 18th September 2012, 03:15 PM   #2
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Outdoors over anything but cement (grass, dirt, sand etc) will be more like 4pi. So don't count on 2pi output just yet....

I have a similar sized cabinet with the same woofer used in my car (but tuned to 30ish Hz). I tested it inside and it had solid output (used a bridged qsc mx1500a...) but I never tried it outdoors so no help there.
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Old 18th September 2012, 03:20 PM   #3
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An ss15 isn't that much bigger, but I'm not sure if you want a box that big. If you do sim it in the ss15, see how it works.

When powering off batteries, I'd want the most efficient setup possible, so using that kind of driver as opposed to a 3015lf (similar price, much better efficiency) isn't really the best choice.
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Old 18th September 2012, 03:55 PM   #4
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Outdoor use would be mainly on paved or packed dirt surfaces.

I have a ported 15" for my SUV in about 4 cubes and it seems to have decent output outside with the hatch open.

I've simmed most of the LF PA drivers - while they claim massive sensitivity, most of them are only marginally more sensitive than the 15" HO below 100hz. The 3015LF was pretty decent, while the Delta-12LFC was a standout for sensitivity with reasonable extension for box size - but only 1-2db above what the 15" HO simmed at the 40-50 hz peak. Unless I'm totally doing it wrong. Simming everything 2pi, 2.83v for 8ohm drivers, 2v for 4 ohm. Amp will max out at 40v.

I found this thread interesting:

BMS 15" in small enclosures - Speakerplans.com Forums

The 15" BMS driver they are discussing has a claimed nominal 98 db sensitivity. But when you look at the spec sheet and do the math, it only really does about 88 db/2.83v/1m anechoic in a sealed box below 100hz. The dayton does pretty much the same as far as I can tell, if not a little better.

I've looked at virtually every type of compact horn available. At this box size I've only found that it's not possible to get better sensitivity and extension than bass reflex - they end up pretty equal when you try to get enough length to the horn for low extension. Then you also have to deal with the group delay of the horn with time correction. An ss15 probably about twice the size and 4-5 db more sensitive (by models).

Last edited by turbodawg; 18th September 2012 at 03:59 PM.
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Old 18th September 2012, 04:04 PM   #5
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Well a 50 lb box that's 4-5db more sensitive could equate to 2x longer battery life. That's a big difference for battery weight, you need to go by Reserve Capacity


Don't forget that having the box in an SUV with the hatch open could be using the cabin as part of the "horn" and adding a huge bump in SPL. You need to test the box outside by itself and see how it sounds! If its enough for you go from there. In my case I needed two ss15's with 600w RMS total and (2) 100 lb deka batteries plus two solar panels in order to rock out on the beach for hours at full tilt with EDM..,
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Old 18th September 2012, 04:15 PM   #6
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Quote:
Originally Posted by m R g S r View Post
Well a 50 lb box that's 4-5db more sensitive could equate to 2x longer battery life. That's a big difference for battery weight, you need to go by Reserve Capacity


Don't forget that having the box in an SUV with the hatch open could be using the cabin as part of the "horn" and adding a huge bump in SPL. You need to test the box outside by itself and see how it sounds! If its enough for you go from there. In my case I needed two ss15's with 600w RMS total and (2) 100 lb deka batteries plus two solar panels in order to rock out on the beach for hours at full tilt with EDM..,
Well you certainly have a point and something more efficient would be better. But I want to be able to transport this in a sedan with a fold down rear seat, not the old suv which isn't driven much. And I'd prefer solid 40hz extension.

Planning on a pdx 4.150 bridged to provide the 400w / 40v @ 4 ohms to one sub powered by 2x 12v 35ah SLA batteries. 8 ohm PA mains so 75 w each to those. I calculate about 3-4 hours of run time playing music at max volume, but I'm hoping for better than that in practice.

It doesn't have to be insanely loud, it just has to be much, much better than your average portable stereo or factory car stereo.
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Old 18th September 2012, 04:32 PM   #7
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Here Is the setup I'm referring to...
Click the image to open in full size.
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Old 18th September 2012, 04:47 PM   #8
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Quote:
Originally Posted by m R g S r View Post
Here Is the setup I'm referring to...
Click the image to open in full size.
Oh yeah, I've seen that, looks cool!
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Old 18th September 2012, 06:23 PM   #9
jwmbro is offline jwmbro  United States
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Honestly, the SS15 is pretty huge. It's small compared to real PA setups, but honestly it's too big for 1 guy to carry around. I'm happy with mine, but for more mobile applications I'm working on a very small 12" TH, about 100 liters internal, and only 15kg total weight, which should give me about 99dB/1W from 50Hz to (hopefully) 200Hz. It's still in the design phase, but top end is a priority for me as I want to use it with 6" tops. So far HR looks quite promising, but it's more of a hard hitter than a deep sub - I'm purposely losing out on the deepest of bass for portability. I gotta go to the pub now to watch football, but when I get around to it I can post up my design (it's still only in my head, needs to be properly sketchupped and hornresped).
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Old 18th September 2012, 07:09 PM   #10
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Really? I carry mine with one hand by the basket of the 3015lf with no problem.
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