Should I learn my ABCs or just stick with the basics?

[Harrison486 10+ year member]

So I am still confused....

ABC or Ported for me?

Also, ported is louder in a certain frequency range than sealed, right? What about the frequencys above the tuning point? Is that just same spl as sealed just worse quality?

 

[Nikuk 5,000+ posts]

ABC's to me are a waste of time and space due to their size with real lack of SPL gain. I've built one for my SI D2 12" when I had it. Tried that sub in sealed, ported, ABC, and 4th order bandpass. The ported wasn't as loud as bandpass but louder than ABC and 1/2 the size. ABC's give a great response at many different frequencies where as ported give's you a nice kick at a certain 5-10hz or so. How I usually just guess it at is like this, a ported box has a theoretical 5db's over sealed, so I just would say that an ABC enclosure has about 3db's on sealed, well in my experience that is.

ABC boxes are not SPL boxes by any means, unless You are very tricky with the tuning.

Where the hell do You get these theoretical gains?

ABC's truely are simple. As stated say your sub needs a 3cuft ported box. Make yourself a box that is a total of 4.5cuft with a board that cuts the box into 2 chambers of 3cuft where the sub will be mounted, and 1.5cuft where the other port will go. You then take 3 pvc pipes cut and made to your desired tuning length and drop em' in da box. The tubing is the hard part but even then if you're good at ported box's it isn't hard.

You are supposed to(in theory) DOUBLE the recommended enclosure, then multiply by 0.66 & 0.33. However, I've done varying sizes from 1/2 vas to 3x vas.

[/meh]

REQ - {search function} N00b :lol:

 

[Nikuk 5,000+ posts]

So I am still confused....
ABC or Ported for me?

Also, ported is louder in a certain frequency range than sealed, right? What about the frequencys above the tuning point? Is that just same spl as sealed just worse quality?

You are asking for opinions on sound quality & accuracy.... EVERYONEs answers will be a little different.

IMO - ported if all You are doing is listening to bass heavy rap.

[/nick]

 

[req 5,000+ posts]

oh cmon nick. you know where the link is. its not really a big deal to me. i dont plan on making any ABC's anytime soon.

if you dont wanna post the link. whatev. //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

 

[Beat_Dominator 5,000+ posts]

Me wanty link too //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif

 

[Harrison486 10+ year member]

Also, ported is louder in a certain frequency range than sealed, right? What about the frequencys above the tuning point? Is that just same spl as sealed just worse quality?

Can someone explain to me how a ported box works.. Or how it differs from a sealed...

 

[Beat_Dominator 5,000+ posts]

In the most bassic sense, the volume of air inside the port/s acts like a passive radiator, you're kind of adding a sub to the real one that's there.

 

[the_noob 10+ year member]

You are supposed to(in theory) DOUBLE the recommended enclosure, then multiply by 0.66 & 0.33. However, I've done varying sizes from 1/2 vas to 3x vas.

Do you double the recommended sealed enclosure size or ported enclosure size?

 

[Harrison486 10+ year member]

In the most bassic sense, the volume of air inside the port/s acts like a passive radiator, you're kind of adding a sub to the real one that's there.

Okay...

But what I am confused about is

Ported is louder tahn sealed since you are getting the sub output plus output out of the port. Is it louder across all frequencies or just a certain range due to tuning? If it is the latter, what about the rest of the frequencies? Does it just act like a sealed box for the rest?

 

[Nikuk 5,000+ posts]

Do you double the recommended sealed enclosure size or ported enclosure size?

recommended ported.

Again, I have found no reason for this in any of the cookbooks or on the websites. But it's not a bad rule of thumb.

For what it's worth.

 

[Beat_Dominator 5,000+ posts]

Okay...
But what I am confused about is

Ported is louder tahn sealed since you are getting the sub output plus output out of the port. Is it louder across all frequencies or just a certain range due to tuning? If it is the latter, what about the rest of the frequencies? Does it just act like a sealed box for the rest?

It would be louder across most of the freq. range that the driver can reach. A bandpass box is the one that would cut you off.

 

[bumpin_blazer 5,000+ posts]

ABC boxes are not SPL boxes by any means, unless You are very tricky with the tuning.
Where the hell do You get these theoretical gains?

I've heard them from about 10-20 people I know that compete as a general guess for noobie types on if someone says "what kind of a gain can i expect from ported over sealed."

again it's all theory though, well that or hypothetical if you'd like.

 

[Raven 10+ year member]

*sigh* Noone is willing to help anyone anymore..

http://www.diysubwoofers.org/prt/dual_chamber.htm

Our RE rep around here has done some work with RE8s, ABC boxes, and less than 180 watts. In his own words, his first reaction to the output was "Holy ****!". You can guess they have something good going for them.

 

[the_noob 10+ year member]

thanks Raven. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif