MJ18M Sealed or ported?

[rraulh 0]

Hello everyone,

2 Weeks ago i received my eagerly awaited mj18m sub from mach5. Now I've been thinking about the box design for quite some time now and had initially decided to go with a sealed box because I don't want the sub to take up a lot of space.

But after modeling the results with winisd I noticed that with a fairly small (115 liters) ported box tuned to 28 hz I get a much higher output obviously, but also a pretty good frequency curve.

So now I'm contemplating if I should go with a small ported box instead of going sealed.

But since the recommended ported enclosure for the mj18m is 142 liters I wonder if going that small is smart.

I want the sub to sound as good as possible thus my main concern being that I will lose some sq if going ported.

So some input in this matter would be greatly appreciated.

[mrogowski 6]

Is this for home or car audio?

[rraulh 0]

Is this for home or car audio?

Sorry, forgot to mention the sub will be used as a home theater sub in a 14 x 24 ft room.

[mrogowski 6]

Ok, what you will want to do (if you can) is to build big and tune low, so you can get the subsonics that are present in movies these days.

If you look at the EBS suggestion, this will put you in that area. If you want to go with a simple and easy build, snag yourself 20" and 8" Sonotubes. You can bang together a sub in less than a day.

Best,

Mark

[rraulh 0]

Ok, what you will want to do (if you can) is to build big and tune low, so you can get the subsonics that are present in movies these days.

If you look at the EBS suggestion, this will put you in that area. If you want to go with a simple and easy build, snag yourself 20" and 8" Sonotubes. You can bang together a sub in less than a day.

Best,

Mark

The problem is that I don't have the space to go that big. I like the Sonosub idea but the problem is that where I'm from (The Netherlands) Sonotubes are really hard to come by. So I'm stuck with either a 95 liters sealed box or a small ported box with 115-120 liters.

[mrogowski 6]

Ok, I can see how that would be a potential problem. Can you afford vertical space? Reason I ask is you can go with a box with a "small" footprint but tall. For example, if you can do up a box with internal dimensions of say, 10" x 19" x 70" high you achieve nearly 8 cubes in gross volume. You can then mount the driver on the front and the port at the bottom or top of the cabinet - or front/back with an elbow if you go with tubes.

This will allow you to achieve a lower tuning and help to bring in the ultra low end you would desire for HT.

[rraulh 0]

Ok, I can see how that would be a potential problem. Can you afford vertical space? Reason I ask is you can go with a box with a "small" footprint but tall. For example, if you can do up a box with internal dimensions of say, 10" x 19" x 70" high you achieve nearly 8 cubes in gross volume. You can then mount the driver on the front and the port at the bottom or top of the cabinet - or front/back with an elbow if you go with tubes.

This will allow you to achieve a lower tuning and help to bring in the ultra low end you would desire for HT.

That could work, I have about 8ft of height to play with, that will give me about 10 cubes. In that case i can just tune the port to 18hz like you recommended.

[mrogowski 6]

Good luck, and fill us in on your progress.

[rraulh 0]

Thanks, will do