Quarter Wave Rear Loading a Horn, Who's Tried It?

[hispls 5,000+ posts]

Have you tried firing it to the rear?

 

[Kangaroux 5,000+ posts]

Well, I have so I know what it sounds like in my application, but I want to know if anyone else has tried it. I did some research before giving up and just going ahead with it anyways for the heck of it. It would be awesome if I could find out more about it. Due to the space I had available it turned into a pure SPL setup, but I still think it could work well in a SQ project as well (in a larger vehicle).
Here's what I mean by Quarter Wave into a horn, just so we are on the same page.

+10 for using the hammer editor to make boxes lol

 

[sexiewasd 10+ year member]

lmao, I tried to cut most of hammer out of the pic so nobody would notice. It's the strong grid system that makes it easy, I just build everything in hammer where 4 units = 1 inch so I've got 1/4" 1/2" and 3/4" measurements.

I've not tried firing it backwards, I would really like to but it weighs over 400lb.

It's not staying in there long, it's way too hard backing up with the tiny side mirrors.

 

[sexiewasd 10+ year member]

Alright so I've had it in for a few days and I think that now I've got a pretty good understanding of how it's working as a design.

The transmission line gives it some pretty good low end extension, down to 20hz, although it starts it's rolloff at 32hz it's a really gradual slope. At around 50hz it starts loading the horn and peaks at 58hz, and doesn't really go back down at all from there on up. I think that a with a tapped horn you would get a much smoother response curve, and at 14' long it would only be a little bit larger, with more low end output.

One of the drivers was new and had never seen power, it's broken in fairly well now. It's lost some of it's output higher up, but sounds much smoother and would make a good daily setup if it were not so huge. It's also much louder with the windows down. I don't think that there is enough airspace in the car to load the horn properly with the windows up. I think that with the space available for SPL it's a better approach to fit as much cone and power as you can into a ported wall rather than to use a horn, except maybe for drive-by's windows down. For a daily setup I think that the t-line is an excellent choice if you've got the space. It could easily be designed to fit in only the third row seat area. I'm pretty much sold on the t-line, it's doesn't have near the output of the horn, but is about the same as a similarly tuned ported box, except it has some really tight punch to it like a sealed box does.

It's still impressive how much output you can get from only two tens on low power if you have the space.

 

[quackhead 10+ year member]

lol...im glad to see this done...I've been wanting to TH load one of those freaky little saz 8's for awhile...it just doesn't want to model out for me too well. I bet your set up would sound pretty good as a living room table...but 400 lbs of unbound hell in a car wreck.