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Old 26th May 2014, 02:37 PM   #1
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Default Dayton Sd315-88

Hi,

I have recently bought a sd315-88 driver and a 330 watt plate amp with the idea of building a sub for my main system. Whilst initially created as a music system it's usually is used for film watching and a little music.

The main system is a naim 250 clone power amp, AD815 powered preamp, and some KEF Concerto 1 speakers.

I want some reinforcement in the bass area and those components seemed both reasonably priced and much better than what I could get if spend the same money 250 on a sub.

I'd like some advice on what to build, my living room is pretty large 6m x 7m.

Should I go vented or sealed. I like the compactness of a sealed system and WAF is very important. However I really want a pretty good sub that goes as low as possible without sounding rough or boomy.

Power shouldn't be an issue since the amp is way over spec for what the driver needs.

Any need or experiences would be greatly received.
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Old 26th May 2014, 09:50 PM   #2
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The t/s parameters and relatively low Xmax of the SD315 all suggest that you'd be better off with a vented alignment. In fact, given the specs, if I was using that driver I'd probably be looking into an EBS type of alignment to get a bit more low bass out of it.
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Old 27th May 2014, 10:19 AM   #3
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But it looks like that would require a 140 litre cabinet which is way to big for the wife to accept it.

70 is pushing it volume wise.

On a side note I have found my mains go down to 48 at -3dB, so I'm guessing a ported 70 could go down to what 25hz?
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Old 27th May 2014, 04:26 PM   #4
tb46 is offline tb46  United States
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Hi filholder,

Would that 70L box volume be external, or internal; e.g.: Vnet=70L? Would you have some preferred external dimensions?

Regards,
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Old 27th May 2014, 06:30 PM   #5
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I kept reading on the parts express link for the dayton sub that a 2.4 cubic foot box (67l), interior dimensions with either a 3" or " inch port would work. So a 70 litre internal box minus bracing could work i thought.

I just wanted some confirmation that would work since when i get down to building something Im a bit of a perfectionist and dont want to build a lovely box and then for it not to work, so any advice would be very gratefully recieved.

Id ideally like something higher , and longer but not too wide.
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Old 27th May 2014, 07:03 PM   #6
tb46 is offline tb46  United States
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Hi filholder,

That would work, assuming you are getting the net volume into the 68L range. I would recommend using two 3"Dia. ports, w/ one port the port velocity will get too high quickly. Even w/ 2 3"Dia. ports you might hear some port noise. I'll attach a Hornresp Input screen...hope the T/S parameters are up-to-date.

Regards,
Attached Images
File Type: jpg SS315_BR_Input.jpg (27.8 KB, 187 views)
File Type: jpg SS315_BR_Port_Velocity.jpg (18.2 KB, 184 views)
File Type: jpg SS315_BR_SPL.jpg (20.4 KB, 186 views)
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Old 27th May 2014, 07:26 PM   #7
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Thanks so much for taking the time out to do those calculations.

Any idea what length of tube id need?
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Old 27th May 2014, 09:12 PM   #8
tb46 is offline tb46  United States
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Hi filholder,

The dimensions for the port are in the Hornresp Input: length = Lpt = 30.8cm. Take that with a grain of salt, depends on how close you are to the opposing wall of your enclosure, the exact enclosure net volume and if you provide any form of end termination around the duct; but, should be close enough to get you started providing the T/S parameters are correct.

Regards,
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Old 29th May 2014, 10:34 AM   #9
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Thanks, sorry I'm new to speaker building.

Are there any disadvantages to a slot port? I'm struggling to find either 3" reflex ports long enough or even 70mm internal diameter PVC pipe here in Europe.

If they work ok is it simply a case of matching the surface area of two 3" ports?

As always I'm clueless.

Regards,

Phil
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Old 29th May 2014, 12:19 PM   #10
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Phil,
Just to be cautious, make sure you have the SD315-88 or Dayton SD315A-88 because they are different.
Dayton Audio SD315-88 pdf1 Shielded
Dayton Audio SD315A-88 pdf2
Dayton Audio SD315A-88 12" DVC Subwoofer
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