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Old 01-13-2013, 08:56 PM
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I don't think one of these exists, at least not actively (that i've seen), so let's start one up!

Here's what I know:

First, how it works-
With any bandpass enclosure (similar to banpass crossovers) you will have 2 cutoff frequencies/peaks.

Upper cutoff will be a higher frequency, lower cutoff will be a lower frequency.

beyond these two frequencies, output will taper. This is referred to as slope (more on this later).

all frequencies between and including the upper and lower cutoff frequency is referred to as the bandwidth.

Your bandwidth is, in essence, your frequency response. Your box is designed to play a certain range of frequencies before tapering at the cutoff frequencies.

There's some basic vocab, now let's move on.

Two different 6th order variations-
-Series tuned
-Paralell tuned

The difference between the two (by definition anyways)
Series tuned - rear chamber ports fire into the front chamber, or inside the box

Parallel tuned - rear chamber ported into the cabin (not into the box)

You've got two chambers
-rear ported chamber
-front ported chamber

Here's how they work

The rear chamber controls the lower half of the bandwidth
The front chamber controls the upper half of the bandwidth

Just like a regular ported box, the tuning frequency of a specific chamber controls the frequency response, then the box volume and port area control the output at that frequency.

So (like a 4th order) Larger rear chamber means more output at lower frequencies, and vice versa. Same applies to the front chamber.

The rear chamber is typically tuned between 28-35 hz (just like a regular ported box). Also, the rear chamber (usually) uses about half the port area as a typical ported box requires. There's some gray area here, but I usually use 5-8 sq inches per cube in the rear chamber.

The front chamber is usually tuned an octave above the rear chamber and uses a lot more port area (I use like 28-35 sq inches per cube).

an optional step once it's built - shrink the port area until you find a sweet spot.

A side note:
Most daily bandpass boxes are designed to have a nice flat response across a wide range of frequencies. The rumor of bandpasses being peaky and not very musical is simply not true of a properly designed box.

These are some very basic rules of thumb. Feel free to correct me, or add more to this.
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Old 01-13-2013, 09:16 PM
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I am most likely doing another parallel tuned 6th order in my jeep. Best setup I've ever had
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Old 01-13-2013, 09:20 PM
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you make it sound fun what's the difference in sound/output between series and parallel?
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Old 01-13-2013, 09:25 PM
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Quote:
Originally Posted by O.G. D-Wet View Post
you make it sound fun what's the difference in sound/output between series and parallel?
I can't really comment on that. I haven't listened to/built anything but series tuned.
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Old 01-13-2013, 09:36 PM
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A few random notes:
6th orders are very efficient daily boxes. Can be louder than ported and 4th orders (properly designed)

If you've ever wondered why many 6th orders are such low end monsters, it's mainly due to the reduced port area in the rear chamber. Less port area allows for better cone/suspension control under tuning. In my experience 6ths usually have no trouble playing well below tuning.

As mentioned earlier, they are excellent daily/musical boxes. Their bandwidth is such that a 6th tuned to say 30/60 hz (respectively) would play down into the mid to low 20's, and all the way up into the 70s.

Again, very efficient boxes. I built a 6th for a pair of 8's on 700 ish watts that nearly outperformed a box I built for a pair of 12's on 1.2k. Certainly played a wider range of frequencies, especially the low end.
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Old 01-13-2013, 09:58 PM
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you are definitely getting me excited thinking about this option. I've honestly never considered building a 6th order. They've just always scared me off with their complexity. I always had that fear of wasting materials and hours of my time only to never get it right. But the way you explain it makes sense to me and makes me want to dive in headfirst
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Old 01-13-2013, 10:19 PM
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They're a little tricky to design, and they take up a metric ****ton of space lol. But they're so worth it

I encourage everyone to try it at some point. I've got a design with cutsheet for a pair of sa-8's (with cutsheet) if anyone wants it.

6th order sa 8 v1 by GPC - 3D Warehouse
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Old 01-13-2013, 10:25 PM
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What I loved about my parallel tuned is. One, I didn't have to do any tuning. It was literally perfect. Two, if I did have to do any tuning, I didn't have to take the box apart to do so. Three, it had the most bandwidth of any setup I've ever heard. It was very flat across an insane amount of frequencies.Four, it was stupid efficient.
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Old 01-13-2013, 10:30 PM
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Its pretty interesting and might be something id like to try, id like something like this for a pair of SA v2 8s, but at the same time I do have a pair of Infinity 8s sitting here i was about to build a simple ported box for, might be time to build something different, lol.


Thanks for this thread man, good stuff.
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Old 01-13-2013, 10:30 PM
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Quote:
Originally Posted by LyferXB9s View Post
What I loved about my parallel tuned is. One, I didn't have to do any tuning. It was literally perfect. Two, if I did have to do any tuning, I didn't have to take the box apart to do so. Three, it had the most bandwidth of any setup I've ever heard. It was very flat across an insane amount of frequencies.Four, it was stupid efficient.
Have you built a series tuned? Can you compare the two?
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