#881719 - 01/22/01 04:34 AM
PA cabinet design question.
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Benjamin Esparza
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Registered: 01/22/01
Posts: 3
Loc: Pico Rivera,CA,UNITED STATES
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I have a pair of TOA PA cabinets. It has a piezo tweeter, midrange horn, and 15" woofer. My question is on the cabinet design. The front of the cabinet where the woofer grill is (it is a rear mounted woofer) is not the typical round grill. It is rectangular with the length being about 15" but the width is about 6". What is the advantage to this design? What are the disadvantages? What's the rationale behind this design and why would TOA use this?
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#881720 - 01/22/01 11:33 AM
Re: PA cabinet design question.
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Anonymous
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The rear mounted slot for the woofer is done usually for "horn loading" the woofer. This typically is a more efficient way of coupling the driver to the air; resulting in more loudness for each watt of input.
It also tends to be an older type of practice as most new cabinets tend to front load their speakers to save on size.
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#881721 - 01/22/01 04:15 PM
Re: PA cabinet design question.
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Benjamin Esparza
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Registered: 01/22/01
Posts: 3
Loc: Pico Rivera,CA,UNITED STATES
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Thanks for the info. However, this is not your typical horn loaded woofer. The front of the cabinets are flat. It doesn't have that typical woofer set in with a grill and the sides flaring out from the grill to meet the front of the cabinet. It looks like a typical flat fronted cabinet, except instead of having a round grill, it has that longitudinal rectangular grill. Can you explain how that would work either better or worse than the typical round grill front?
Furthermore, would I be improving the design if I were to saw out (I'm highly skilled at cabinet making) a round hole and front-mount the woofer and use an aftermarket round grill for protection? I'd like to know which is the most efficient means of installing the woofer in this cabinet design. They are great cabinets with plenty of power handling, has a tweeter L-pad, and are are bi-ampable. That rectangualar grill design, to an uninformed person like myself, just seems strange and not take full advantage of the woofer's cone area. Please enlighten me.
Big Ben
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#881722 - 01/23/01 11:41 AM
Re: PA cabinet design question.
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Anonymous
Anonymous
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Opening up a front flush rectangular slot to the cones full radius would provide a "little" more efficiency. But you have to balance that with how well it will look after the surgery.
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#881723 - 01/23/01 12:27 PM
Re: PA cabinet design question.
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Benjamin Esparza
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Registered: 01/22/01
Posts: 3
Loc: Pico Rivera,CA,UNITED STATES
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Aaaaahhh! I see. Obviously, the benefits of optimizing the cone's full radius are probably not worth the hassle and labor of opening up the front of the cabinet. I guess it was designed that way for a reason. Thank you very much.
Big Ben
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