Hello, I have some problems understanding H-frame 
I have 21" Pro audio woofer. I want to make h-frame with it, but I don't quite get how deep should frame be. I need it to cross at 110-120hz. I believe my only concern is to make it shallow enough, so it doesn't have unwanted pipe resonance too close to desired crossover, right?
But I don't quite get how distance is measured to determine resulting path lenght.
Which is correct way?
Is it Red
or Green
Or Green + Blue?
Or all of them wrong. Please help I am realy stuck with this
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I have 21" Pro audio woofer. I want to make h-frame with it, but I don't quite get how deep should frame be. I need it to cross at 110-120hz. I believe my only concern is to make it shallow enough, so it doesn't have unwanted pipe resonance too close to desired crossover, right?
But I don't quite get how distance is measured to determine resulting path lenght.
Which is correct way?
Is it Red
or Green
Or Green + Blue?
Or all of them wrong. Please help I am realy stuck with this
ebay image hosting free
Hi, this tells you how to calculate it, you have to take into account the "effective radius" of the pipe, this is shown as r effective in the equations http://www.quarter-wave.com/OBs/U_and_H_Frames.pdf
FWIW I've been using Martins 18" Goldwood design for years now. Internal dims are 20"x20"x16". I moved my baffle a bit more to the front and cross at 70hz ish @ 24db. Great sound etc. Is your woofers QTS high enough or are you going to equalize etc?
Here's the project:
http://www.quarter-wave.com/Project08/Jordan.pdf
Here's the project:
http://www.quarter-wave.com/Project08/Jordan.pdf
H frame dimensions
Hi there v: The width dimension you shown is 14" for your 21" driver, driver will not fit. The depth dimension of 9" per side of the H seems reasonable (18" total for a H frame). I tried shorter dimensions for the depth, however, ended up with 10" working, after extending experiments with cardboard. Have you considered a U frame (1/2 the total depth of a H frame? ...regards, Michael
Hello, I have some problems understanding H-frame
I have 21" Pro audio woofer. I want to make h-frame with it, but I don't quite get how deep should frame be. I need it to cross at 110-120hz. I believe my only concern is to make it shallow enough, so it doesn't have unwanted pipe resonance too close to desired crossover, right?
But I don't quite get how distance is measured to determine resulting path lenght.
Which is correct way?
Is it Red
or Green
Or Green + Blue?
Or all of them wrong. Please help I am realy stuck with this
ebay image hosting free
Hi there v: The width dimension you shown is 14" for your 21" driver, driver will not fit. The depth dimension of 9" per side of the H seems reasonable (18" total for a H frame). I tried shorter dimensions for the depth, however, ended up with 10" working, after extending experiments with cardboard. Have you considered a U frame (1/2 the total depth of a H frame? ...regards, Michael
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It's just random drawing from google. I already built my frames. They are performing as expected
Measurements show no peaks in pass band. Thanks for sugestions.(may need to click on image to see non distorted image)
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