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Old 16th January 2006, 08:02 PM   #1
chops is offline chops  United States
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Default FOUR Dayton 15DVCs and 700 watts....

Ok everyone, I have finally made up my mind for this subwoofer project that I've been thinking about for the last couple of months. I have so far thought about using PRs, but I ditched that idea. I also pondered the idea of going with a slot ported design, which I have also ditched.

So here's my latest, and most likely final design. *plain, simple, sweet*

I am going to run a total of four Dayton 15DVC subs. There will be two 8 cu.ft. sealed enclosures with two 15s sharing the same air space. I'm going to wire them so that each pair will be 2 ohms. I will then get a QSC RMX1450 amp to power them. This amp will give each pair of subs a total of 700 watts @ 2 ohms.

According to WinISD Pro, one enclosure will provide 104dB @ 15Hz with just over 500 watts of power, and that does NOT include room gain. Peak cone excursion (both ways) will be around 17mm which is well below the capabilities of these drivers. Group delay will reach a max of 7ms, also at 15Hz.

If anyone has any "guesstimates" on what the output might be with both enclosures running in a 13' x 17' x 8' room, feel free to share.

Anyway, here's a few screen shots from WinISD Pro. I just used the 15" Titanic Mk III as a reference (yellow). Please let me know what you all think also.

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Old 16th January 2006, 08:21 PM   #2
simon5 is offline simon5  Canada
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16.7 mm peak excursion is more than the 15.1 peak excursion that woofer can do. It's not that much more so it'll be probably ok.

You'll have enough bass no matter what anyway with 4 woofers.
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Old 16th January 2006, 08:40 PM   #3
chops is offline chops  United States
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Quote:
Originally posted by simon5
16.7 mm peak excursion is more than the 15.1 peak excursion that woofer can do. It's not that much more so it'll be probably ok.
15.1mm is the Xmax in one direction, so the 15DVC should be able to peak at 30.2mm (both directions) and still be linear.
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Old 16th January 2006, 08:53 PM   #4
simon5 is offline simon5  Canada
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Yes but WinISD shows peak excursion, not peak to peak.
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Old 16th January 2006, 09:01 PM   #5
chops is offline chops  United States
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Well at any rate, I highly doubt I'll ever be dumping a full 500 watts into these subs anyway at any frequency. Just one 15DVC with this 115 watt amp gets pretty darn loud as is.
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Old 16th January 2006, 09:20 PM   #6
simon5 is offline simon5  Canada
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Yeah, like I said, don't worry much hehe, you'll have enough bass.
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Old 16th January 2006, 09:43 PM   #7
chops is offline chops  United States
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So any thoughts on what my total output in-room should be with all four subs running? I'm just curious. I'm guessing maybe 113-ish dB at 15Hz?!
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Old 16th January 2006, 10:25 PM   #8
simon5 is offline simon5  Canada
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I'd say around 120+ dB is possible if it's in a corner.
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Old 17th January 2006, 04:37 AM   #9
chops is offline chops  United States
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120+ dB at 15Hz?!?! Holy cow, I better think about reinforcing my concrete walls. I don't want them falling over or anything! LOL
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Old 17th January 2006, 05:18 AM   #10
Relax is offline Relax  United States
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What made you move from dipole to multiple sealed subs?

Sound quality? Quantity? Different room? etc?
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