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tapped transmission line thingo, PVC pipe, will it work?
tapped transmission line thingo, PVC pipe, will it work?
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Old 15th August 2010, 12:29 AM   #1
ThyDntWntMusic is offline ThyDntWntMusic  Australia
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Join Date: Feb 2008
Default tapped transmission line thingo, PVC pipe, will it work?

Trying to get the most from some 4inch woofers in a small hatchback.

the resonant frequency of the car is 51Hz.

so, can I make a 51Hz transmission line, with the front exiting at the rear, so, its a loop of PVC pipe, with the two ends meeting about 2.5cm from each other... if that makes sense.

I'll draw up a diagram of what I mean in a minute.

Click the image to open in full size.

Click the image to open in full size.
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Old 15th August 2010, 11:59 AM   #2
Volenti is offline Volenti  Australia
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1. I wouldn't have the 2 openings firing at each other with such a small gap, it will change the response, if you must do it that way, make the gap at least the diameter of the pipe wide.

2.TL/horns ect will drop in frequency when loaded in a vehicle, some of my really big TL's peak 10hz lower in the car than they do outside, so you'll have to keep that in mind.
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Old 15th August 2010, 12:12 PM   #3
ThyDntWntMusic is offline ThyDntWntMusic  Australia
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Join Date: Feb 2008
Quote:
Originally Posted by Volenti View Post
1. I wouldn't have the 2 openings firing at each other with such a small gap, it will change the response, if you must do it that way, make the gap at least the diameter of the pipe wide.

2.TL/horns ect will drop in frequency when loaded in a vehicle, some of my really big TL's peak 10hz lower in the car than they do outside, so you'll have to keep that in mind.
the 2cm gap means the area of the opening is the same as the area of the pipe.

folded horns that I've tried in the car will normally peak at the vehicles resonant frequency, assuming they play low enough
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Old 20th August 2010, 12:26 AM   #4
ThyDntWntMusic is offline ThyDntWntMusic  Australia
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Join Date: Feb 2008
I tried this out using some cheapo crappy stock 4inch speakers...

well, it made noise, not as loud as expected, and the woofer fried in about 5 seconds...

so, I'm really not sure if I got the gain I was expecting or not, and I'm guessing the 10 watt speaker didn't like 50+watts...

has anyone played with tapped horns much in car?
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Old 20th August 2010, 01:57 AM   #5
ThyDntWntMusic is offline ThyDntWntMusic  Australia
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Join Date: Feb 2008
and now I've just realised I had the high pass filter set at 80Hz while trying to play 51hz.. not that it would have made much difference as the woofer smoked anyway
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