Help with Ported Box for Rockford Subs

Whats goin on Eli...welcome.

I'm not familiar with those HX2's but sure some others here can help you out...to answer your other questions though...yes you can have them in a common chamber enclosure and have it sound right...just make sure the ports are big enough...but if one driver fails than it will sound like poopy...thats why the divided box is a little better...insurance...if on driver fails the other one does not see a box that is suddenly twice the size.

 

I would rather have 2 subs in one 4 cu ft box, then 2 subs in two 2 cu ft boxes. Ported boxes have a little different response characteristics then sealed boxes (and some similarities). How Low a ported box hits is a function of box size, not port tuning. Port tuning changes relative gain. So go with two woofers in a single 4 cu ft box.

And I would use a minimum of two 4-inch round ports.

 

Agreed, one box for both. but dont forget the internal bracing

 

4 cuft shared by both subs tuned 32hz is wonderful enclosure for the hx2's . Good subs you got there

 

be sure that you don't overpower these subs in a shared enclosure, and you also want to stay WAY THE HELL AWAY from any clipping at all.

I don't recommend "sharing" a space for two subs because of the ramifications of what could go wrong, but it can be done and it will sound fine, but like I said.. just make sure that you stay within the recommended power handling, and be sure that you aren't pushing the amp too hard to acheive that.. the results will definitely be catastrophic to the harmony of your subs..

 

Port Tuning has Nothing to do with how low a ported box hits. Size does. And at 4 cu ft you have a good size. Port tuning effects relative gain and a little gain is helpful. I would recomment tuning around 38- 40 Hz.

Here are my recommendations two 4-inch ports that are 9-inches long

Take it or leave it, my 22-cents worth

 

Take it...the end...quit asking about the same thing when it has been answered...don't doubt us...lol

 

aznboi3644 you got 2 boxes to build, get to work.

 

port tuning has NOTHIING to do with low frequency extension????

In car or in home, it makes a big difference. . I must TOTALLY disagree.. Below the port tuning frequency, there is pretty much nothing as far as usable output goes. In car you have transfer function which reinforces the low end, in the home enviorment you have the same princable, just on a different scale.

What you say makes NO sense.

Tune a box to 180 HZ and stick it in your car, what does it sond like???? ****

no bottom end, period. I understand totally the spl side of a box and its tuning,
and I totally uncerstand box volume and its effects on low freq. extension, crap, i have built more sub boxes than probably all of you put together!!!

Pleas e clarify your statement on box tuning ranger, maybe I missed your point.............

 

Yes Ranger I know...Just got paid today...gonna be gone this weekend but after that I'm goin to get my wood...then the box building begins...I'll take pics and post em up here when I get started...have no idea how to post pics though.

 

Let me try this again. FirstThe Viking is 90% right. Probably a little more.

But I stick by my recomendations for tuning for IamEli.

Let me see if I can fix this, tuning from 32 to 38 there is no appreciable loss in the f3 point for this woofer in this enclosure. The 0dB point also changes slightly. But the change is not Significant.

I picked a couple of woofers randomly from WinISD's data base, this is the data from one of them. And I got similar results from all the woofers I loaded. Some changes were more some were less.

What I see from the data is that as box size increases the f3 point decreases. Also if box size remains the same and only tuning is changed by 10Hz the f3 point change can very from a couple of Hz to 5 or 6 Hz. I consider this change, insignificant.

If I am wrong please explain why. Tell me how I should have worded my explination. Like everyone else, I am here to learn more.