Hi folks,
I am new in speaker design.
How to design this folded horn subwoofer (matematically):
http://www.cerwinvega.com/images/Products/Vega-Bass/fh-cut.jpg
Any book, paper?
Thanks!
I am new in speaker design.
How to design this folded horn subwoofer (matematically):
http://www.cerwinvega.com/images/Products/Vega-Bass/fh-cut.jpg
Any book, paper?
Thanks!
Hi - that's a Cerwin Vega EL36. For a start look at the thread link below where Brian Steele presents a hornresp model for that cabinet:
Cerwin-Vega EL36 HornResp parameters
Cerwin-Vega EL36 HornResp parameters
Thanks, this is just plan for encloser but physics (acoustics) behind this horn is not presented...
here's some general horn theory: BD-Design - Bass Horn Design
Cerwin Vega's horn like many are designed to be a practical size for one man to wheel through common doorways and their mouths are thus relatively small for cutoff. So they work best packed next to each other in multiples - which are needed anyhow for most venues.
A longer path horn could be packed into the same space giving a lower cutoff frequency, That may be at the expense of lower output levels in that bass range for a single cabinet. (look at some of Bill Fitzmaurice's designs)
Cerwin Vega's horn like many are designed to be a practical size for one man to wheel through common doorways and their mouths are thus relatively small for cutoff. So they work best packed next to each other in multiples - which are needed anyhow for most venues.
A longer path horn could be packed into the same space giving a lower cutoff frequency, That may be at the expense of lower output levels in that bass range for a single cabinet. (look at some of Bill Fitzmaurice's designs)
Design method
Hi,
this is my results from my short research. I define 3 steps in horn design:
1) Horn design (math model);
(PDF) Horn Theory: An Introduction, Part 1
Library Genesis
2) Investigate how to get a good response at low frequencies (30-50Hz) without the horn bell being 3m or wider 😀 (but the size of commercial models). - THIS PART IS CRITICAL AND UNKNOWN for me!
3) Folding process - with Advance Central Line Aproximation.
Hi,
this is my results from my short research. I define 3 steps in horn design:
1) Horn design (math model);
(PDF) Horn Theory: An Introduction, Part 1
Library Genesis
2) Investigate how to get a good response at low frequencies (30-50Hz) without the horn bell being 3m or wider 😀 (but the size of commercial models). - THIS PART IS CRITICAL AND UNKNOWN for me!
3) Folding process - with Advance Central Line Aproximation.
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Hi,
2) can't beat physics, you must sacrifice one for the other two: low frequency extension, efficiency (SPL for given driver), small size. The hoffman's iron law 🙂 In general, boxes like the CW are optimized for SPL instead of low extension. Freddi has it all covered in his post above. So, you must sacrifice some SPL to get lower extension than commercial models in the same package size.
From what I've read from this forum, a design process is something like this: define your requirements and try to design to that. Most of the time it is the size limit you have to determine first. Bigger is always better for SPL and extension, but it has to fit to your storage and transport and must be handled with the manpower you have available. Then try to fold the horn optimizing between response and SPL for the driver and amount of boxes you have in mind.
If you need 30Hz extension, your first goal is that but then determine either target SPL or size and let the other be what you get 🙂 Eventually only your wallet is the limit. Good luck!
2) can't beat physics, you must sacrifice one for the other two: low frequency extension, efficiency (SPL for given driver), small size. The hoffman's iron law 🙂 In general, boxes like the CW are optimized for SPL instead of low extension. Freddi has it all covered in his post above. So, you must sacrifice some SPL to get lower extension than commercial models in the same package size.
From what I've read from this forum, a design process is something like this: define your requirements and try to design to that. Most of the time it is the size limit you have to determine first. Bigger is always better for SPL and extension, but it has to fit to your storage and transport and must be handled with the manpower you have available. Then try to fold the horn optimizing between response and SPL for the driver and amount of boxes you have in mind.
If you need 30Hz extension, your first goal is that but then determine either target SPL or size and let the other be what you get 🙂 Eventually only your wallet is the limit. Good luck!
What is the Venue Type & Size? Are Room Corners Available? How low do you want to go?
Design will take entirely different pathways depending how you answer these questions. WHG
Design will take entirely different pathways depending how you answer these questions. WHG
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