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Old 13th August 2013, 08:51 PM   #1
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Default bandpass / back loaded horn

Here goes, first post, hoping to avoid sounding stupid..

Looking for some direction on this or calculations if they exist. I am looking to build a crossover-less back-loaded horn. straight forward enough..but I'm looking for it to be a bass/midbass unit only (I know..why?..bear with me on this one, I know it seems stupid). I dont want the driver to be full range into open air, so I began to ponder puting it into a ported enclosure vented to the rear to boost the low end further, or if nothing else, prevent mid and hf information from coming from it.

Any thoughts, ideas? Anybody familar with existing designs like this?

Thanks in advance!
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Old 13th August 2013, 09:55 PM   #2
Greg B is offline Greg B  United States
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Most people call this a front loaded horn. So, sure, it can be done. Not stupid at all.
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Old 13th August 2013, 11:03 PM   #3
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So basically it will be a front horn with a ported enclosure. That makes sense, thanks.

I've been doing this as a hobby for some time now, but have never worked with horns before. I have the horn portion figured out, but I've heard that ported enclosures with horns can be tricky. Any suggestions as to a size calculation formula or where to be looking to tune the ported side to?

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Old 14th August 2013, 04:13 AM   #4
Greg B is offline Greg B  United States
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You might want to look into a simulation program. I don't think horn response does ported chambers, but I'm pretty sure AJ horn does. It's not free, but not terribly expensive either. There might be others.

Sorry, don't know of a formula, but perhaps one of the more experienced people here does. You might start by calculating an appropriate size for a sealed chamber. I've done one horn with a ported chamber, and essentially made an educated guess.
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Old 14th August 2013, 12:06 PM   #5
IG81 is offline IG81  Canada
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Hornresp will do ported chambers, so it's a good starting point IMO.

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Old 14th August 2013, 01:42 PM   #6
tb46 is offline tb46  United States
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Hi dutchess,

Attached is a Hornresp simulation, it's a compound horn (CH), and the first 3 sections (S1-S4) are the front horn, and the S5/S6 section is the port. It's a very flexible design, maybe you can modify it to suit your needs.

Attached Images
File Type: jpg LAB15_compound_Input_2013_Aug14jpg.jpg (39.0 KB, 148 views)
File Type: jpg LAB15_compound_Schematic_2013_Aug14jpg.jpg (19.3 KB, 143 views)
File Type: jpg LAB15_compound_SPL_2013_Aug14jpg.jpg (27.1 KB, 145 views)
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Old 16th August 2013, 03:14 PM   #7
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Great, thanks everybody!
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