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Old 5th July 2013, 10:19 PM   #1
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Default First HT sub.

I am building a sub for a friend of mine who is putting in a home theatre. The room is 26/14/9 and he has installed Dayton in walls for a 5.1 system. I have a Dayton RS315HF-4 for the driver and a bash 300 amp. I need opinions on what size enclosure i should use to sound the best with his HT. Also would you go sealed or vented?
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Old 7th July 2013, 08:41 PM   #2
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Ok so it looks as if a vented 3-4 cu ft enclosure will be the best choice. I am going to use 2x3inch vents at about 17" each. Does this make sense?
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Old 7th July 2013, 10:39 PM   #3
ODougbo is offline ODougbo  United States
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Steve, did you check PE forum?

HT Subwoofer Doesn't Sound Right
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Old 8th July 2013, 01:59 PM   #4
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Quote:
Originally Posted by castlesteve View Post
Ok so it looks as if a vented 3-4 cu ft enclosure will be the best choice.
3cuft is about right for vented. F3=23Hz

You can go for a 3cuft Closed Box if you don't mind a higher F3=36Hz.
Attached Images
File Type: jpg DAYTON RSS315HF4_ported.jpg (78.3 KB, 94 views)
File Type: jpg DAYTON RSS315HF4_SEALED.jpg (76.0 KB, 94 views)
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Old 9th July 2013, 07:33 PM   #5
ODougbo is offline ODougbo  United States
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Steve, how is your project going?
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Old 10th July 2013, 03:47 PM   #6
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Hi, guys.
It's my first impression that Dayton Audio 12" woofer RSS315HF-4 is well adapted for a sealed sub enclosure with that mentioned amp. (Just as a side note the 400W max. can not take the woofer to max excursion in a BR that would need close to min. power ~900/1000W@4/3.6 Ohms). This combo amp+driver (sealed) is just perfect. I would probably start with a sealed ~100L/90L(QTC = 0.707) enclosure, as was referenced (85L) in the previous post.

100L = 3.5315ft³
85L = 3.0017ft³ (Michael Chua)

The VB ~120 L/FB ~ 22.0 Hz for a BR, low tunning frequency and monstrous enclosure (you have to add here to the net int. vol. all the space for the big vents and all) doesn't make it a good BR practical candidate, instead it's good performance and low F-3 dB=20 Hz. The problem is again is the power RMS needed for such a monster Pmin. 698.2 W@4.2 Ohms to 818.3 W@3.6 Ohms (22/164.3 Hz), for it's max.excursion, when 400W is the spec RMS and amp specs (Bash 300W) are "300 watts RMS @ 0.5% THD into 4 ohm load".

A quarter wave is also a great performer for this driver.
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Old 10th July 2013, 11:54 PM   #8
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Thanks for all the posts guys. I am starting the build this weekend and am going to do a 3.5cu ft ported with 2x3" ports. I am having a carpenter build the box as it is going to be disguised as an end table type thing and painted to match the existing cabinetry. I will post some pics when i have them.
Cheers.
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Old 11th July 2013, 12:14 AM   #9
badman is offline badman  United States
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Before you go too much further- has your friend considered infinite baffles?

Zalytron has their woofers on sale, the 1201PL is $99.... for a case of 12, solid 12" woofers. They would work nicely in an infinite baffle (in-wall) setup, with 8 of them, you would never be wanting for output or power handling.
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Old 11th July 2013, 03:17 PM   #10
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Quote:
Originally Posted by castlesteve View Post
I am having a carpenter build the box ...
You may want to ensure the box is sufficiently braced and the joints are well sealed.
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