My first sub build.. suggestions needed. - AVS Forum
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post #1 of 11 Old 05-21-2012, 07:11 PM - Thread Starter
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Hello all, I'm planning my first attempt at a sub build in about a month or so. I am a novice and have only done a few woodworking projects, none of which were speaker builds, so I need to keep it simple for now.

I have a 200 watt amp so this is going to be a passive build and ill use the amp I have for the time being. My theater room is 22x12x9. High spl isn't as important to me as low extension is, I'm looking for a fairly flat response down to 20hz.

My problem is that I am a novice, so I know it may be hard to acheive this with a simple sealed box design, but I do wanna give it a try. What would you guys suggest for my room? It needs to be a simple, single driver sealed design, and I need to spend $400 or less on the driver. What driver and box dimensions would give me the best results? Thanks in advance!
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post #2 of 11 Old 05-21-2012, 07:53 PM
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I would go with a pair of RS315HF8 dual opposed in a 25" cube. This will get you and -3db at 34hz and -10db at 20hz. Add a MiniDSP to EQ the response and you're golden.
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post #3 of 11 Old 05-22-2012, 09:50 AM - Thread Starter
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I would go with a pair of RS315HF8 dual opposed in a 25" cube. This will get you and -3db at 34hz and -10db at 20hz. Add a MiniDSP to EQ the response and you're golden.

Those look like nice drivers, though I am looking for a single driver design, size is not an issue as long as I keep it within budget. Would the 15" version or a titanic be a better choice for what I'm wanting to do? I would like to keep the frequency curve within 6db or better at 20hz if that is feasible. I understand that it may take more power to do that, but I would like to have a driver and cabinet capable of a fairly flat response at 20hz with the right amplification. I can upgrade the amp later if needed.
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post #4 of 11 Old 05-22-2012, 09:54 AM
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Originally Posted by JDEaston View Post


I have a 200 watt amp so this is going to be a passive build and ill use the amp I have for the time being.

What amp do you have?
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post #5 of 11 Old 05-22-2012, 10:03 AM - Thread Starter
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What amp do you have?

It's just a cheap "personal cable" amp that came with a passive sub bought from mcm electronics years ago. I can't even find any information on it, but do know its a 200watt amp. I will be replacing it soon, but would like to go ahead and start my sub build.
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post #6 of 11 Old 05-22-2012, 10:38 AM
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The Titanic and for that matter the HF driver would not do very much with that power.
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post #7 of 11 Old 05-22-2012, 10:45 AM - Thread Starter
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The Titanic and for that matter the HF driver would not do very much with that power.

What kind of power would I need to acheive my goal? I am new to DIY so I have a lot to learn. I will upgrade my amp soon if that's what I need to do, that's something I plan on doing anyway. I would just like to go ahead and start building the cabinet.
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post #8 of 11 Old 05-22-2012, 11:06 AM
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That will be difficult to answer without knowing what kind of amplification you are planning on buying. There are several here that have achieved great results using the HO and HF lines from Dayton. If you are set on a single driver for now.

Driver: http://www.parts-express.com/pe/show...number=295-468

Amp: http://www.parts-express.com/pe/show...number=300-752

+ materials will have you very close to your $400 budget.

You stated you had $400 for just the driver, which if this is the case, your options are wide open. This would require a larger budget for power in the end. There are too many options to list here without more information.

Chris
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post #9 of 11 Old 05-22-2012, 12:45 PM
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You will have a much easier time with a ported build, especially if box size isn't a concern. You budget does allow for a nice plate amp, along with a solid woofer.

Take these parts

DVC385-88

PA500

6" Port Kit

That's $400.

Build a 27"x26"x26" box with at least a couple window braces. This is what you would get from 500 watts, without ever exceeding Xmax and a max air velocity of 23 m/s. That's just under 115db, and an F3 of 21hz.
LL
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post #10 of 11 Old 05-22-2012, 02:05 PM - Thread Starter
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Quote:
Originally Posted by Jay1 View Post

You will have a much easier time with a ported build, especially if box size isn't a concern. You budget does allow for a nice plate amp, along with a solid woofer.

Take these parts

DVC385-88

PA500

6" Port Kit

That's $400.

Build a 27"x26"x26" box with at least a couple window braces. This is what you would get from 500 watts, without ever exceeding Xmax and a max air velocity of 23 m/s. That's just under 115db, and an F3 of 21hz.

Awesome, sounds exactly like what I'm looking for. Does it matter where I place the port? I can't wait to get started on this, thanks for the help.
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post #11 of 11 Old 05-22-2012, 02:15 PM
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No, as long as you have several inches of breathing room on both ends
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