ported fiberglass box???

[novice 10+ year member]

can a fiberglass box be ported? if so, is it the same process to calculate tuning as it is a MDF box?

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[Worlddre 5,000+ posts]

yes, yes

 

[ssj2xxgotenxx 10+ year member]

I think aeroports would make it much easier.

 

[rtillaree 10+ year member]

I think aeroports would make it much easier.

the majority of the ported fibo boxes ive seen have aereports, and as for the ease thing im sure your right...

 

[helotaxi 5,000+ posts]

The only thing that makes desinging and building a ported fiberglass box difficult is figuring the exact internal volume of the enclosure. If it is a simple square box, you're better off making it out of wood. Getting exactly what you want from a proted fiberglass box that has complex curves is going to be a huge trial and error exercise and will probably end up costing a great deal of money in materials that end up in the trash as a failed prototype.

What exactly are you trying to achieve. We might be able to suggest an easier way to do it.

 

[novice 10+ year member]

well, i want to build a fiberglass box and i was wondering if it could be ported, which sounds better sealed or ported fiberglass box? but i think ill used the base of a MDF rectangle box and make a fiberglass baffle

any of u done this before? if so was it ported or sealed?

 

[iamamp3pimp 5,000+ posts]

sealed vs ported info is above.

the material of the box wont make a difference.

 

[Immacomputer 10+ year member]

It's not hard to calculate internal volume of a fiberglass enclosure.

 

[helotaxi 5,000+ posts]

It's not hard to calculate internal volume of a fiberglass enclosure.

Sure, after it's built. Doesn't do you much good if you wanted 2 cf but you find out after it's built that it's only 1.6. If there are compound and complex curves involved, you aren't "calculating anything. You can only build it and measure what you have. If it won't work for what your sub needs to sound right, into the trash it goes. There's a reason that most pure fiberglass enclosures are sealed. Much more forgiving.

If you want to make a fiberglass baffle because you want a nicely curved surface, it's usually easier and stronger to build the mounting ring for the sub out from the flat wood baffle with wood and then make a vanity panel from 'glass. The panel doesn't have to support any weight and is much cheaper and easier to build. Stretch your base material over it, resin it, lay a single layer of glass mat for a bit of strength and then fill and smooth it for finishing.

 

[Immacomputer 10+ year member]

Very true. I guess it really depends on how complex the curves are. You can always get a decent estimate for how large the enclosure will be by breaking everything into rectangles and triangles. Again, this will vary depending on how complex it is. Either way, I don't think it will take much work, even on complicated enclosures. Being about .5 cubic feet off on a ported enclosure won't effect the driver's performance too much really.

 

[helotaxi 5,000+ posts]

Very true. I guess it really depends on how complex the curves are. You can always get a decent estimate for how large the enclosure will be by breaking everything into rectangles and triangles. Again, this will vary depending on how complex it is. Either way, I don't think it will take much work, even on complicated enclosures. Being about .5 cubic feet off on a ported enclosure won't effect the driver's performance too much really.

.5 cf could have a HUGE impact. That amount can easily trash the response of an otherwise good sub. If all you care about is loud, it might not make that big a difference, but if you want it to sound good, it needs to be pretty exact. You don't have the 10-25% fudge factor that a sealed box may give you. Close isn't good enough.

 

[Symon_say 10+ year member]

.5 cf could have a HUGE impact. That amount can easily trash the response of an otherwise good sub. If all you care about is loud, it might not make that big a difference, but if you want it to sound good, it needs to be pretty exact. You don't have the 10-25% fudge factor that a sealed box may give you. Close isn't good enough.

you can measure the box when you put the fleece before resin it, its a little work to but you can get almost the size you want.

that's how i measure when i make fiber ported

 

[nVRuckus 5,000+ posts]

you know if you use open MDF rings you can use packaging peanuts inside the box with the fleece laid before you resin it and make adjustments accordingly.

a project Im working on now.

 

[jaycross 10+ year member]

i wanna see more pics and a worklog of that ^^