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Old 02-11-2014, 01:27 PM
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Default First box build-few questions

Ok, so I've decided on the SSA Zcon 18" D1.
going to be running a SQ2200 on it.

This is my first box build [and build in general], and just wanted some tips/suggestions.

Simple cube design, not going to bother with sketchup. We know what a barebone square box looks like.

24" high 36" wide 22" deep, after displacement puts me right about 9^3 ft according to my calcs.

1 4" aero 1" long for tuning of about 31 hz.

Lines up with SSA reccomendations, because I'm not sure what else to go on besides I know I need at least an 8^3 ft box for an 18" speaker I expect to work properly.

I was going to use simple 3/4" MDF to build the box, and liquid nails/a ton of sheetrock screws to put the box together and use calk to seal up the edges to make it as air tight as possible.
Any suggestions/pointers as to if I'm headed into the right/wrong direction?

Also with my port placement, I'd imagine with it being so short, wouldn't make a difference as long as it's as far away from my sub as possible and over 4" away from my walls, right? I was going to run the sub firing into the trunk hatch [96 jeep cherokee] and port up so I know it'll be able to disperse without just hammering my trunk and backfeeding.

Any suggestions/tips?

Thanks in advance.
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Old 02-11-2014, 02:00 PM
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I feel a single 4" port is not enough...
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Old 02-11-2014, 02:01 PM
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Bracing. Bracing. Bracing.
I know I'm losing alot with all of the box flex I'm experiencing.
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Old 02-11-2014, 02:10 PM
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I'd use at least an 8" port, or ideally 2 6" ports
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Old 02-11-2014, 02:28 PM
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Quote:
Originally Posted by Jager View Post
I'd use at least an 8" port, or ideally 2 6" ports
This

1 4" will sound horrible

You would need about 6 of 4" ports to make it work well
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Old 02-11-2014, 06:41 PM
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Thanks for the input everyone.

As far as bracing goes, how can i calculate that into the internal air space?
I know the net cubes will affect my tuning.

I was thinking about just doing an outside brace with some metal or 2x4's or something. Bolt it to the frame, should help fight rise too, right? ;]
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Old 02-11-2014, 06:52 PM
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Double post..

So after checking my calcs, I see 2 6" ports 1' long each will equal will be right in the 31 hz I'm aiming for.

Let's say I did go this route, are there any good rules of thumb to follow when positioning the ports? I think I read somewhere you want to place it at least half the port length from the walls, and as far away from the sub as possible. Is there any truth to this?

I'll have about 4" of space left between the box and my trunk hatch, so was still leaning towards running my ports up. Any major difference in which way the port is facing?

A lot of this is probably common sense to a lot of you folks, but this is my first time running it and my budget is getting close to out. Trying to get it as close to right the first time as I can.

Thanks.
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