If you use too much acoustic material, the bass will sound well defined, but dry. We recommend starting with no lining and work your way up one wall at a time to determine what sounds best. You want to line the walls of the enclosure. For a vented enclosure, you do want the sound to resonate/ring inside the enclosure. If there is no ringing or reflections heard when you snap your fingers, then you have enough fill. If the “snap” rings, you need more fill for a “dead” sounding box (ideal environment for sound reproduction, no reflections). A good test to determine if you need more or less is to snap your fingers inside the empty box. A good rule of thumb for a sealed enclosure is to use a ½ pound of acoustic material for every cubic foot of internal volume. Minimal, medium, or heavy are used to describe the amount of acoustic fill to use.
#Speaker enclosure design box vs cylinder free
This assumes the box is well built, free of voids/leaks, and that good materials are used to construct. QL basically represents the quality of the box. It is a point 3dB down from the mid-band piston response. This is considered the lowest audible frequency. F3 is the –3dB frequency the cabinet can produce. This simply means that every vent should have one flush end with the exterior of the cabinet.įor your knowledge, Fb represents the box tuning frequency. For example, will a wall block your sound or influence the bass? How do you want the cabinet to project to the audience? You will also see “vent ends = one flush end” in our recommendations. You need to consider how you will use the cabinet and where it will be placed if you consider rear porting. Thus, a lot of your bass will come from the rear of the cabinet. This is acceptable, but keep in mind that most of the sound around the resonant frequency of the cabinet will be produced by the vent. Some people may also consider rear porting a cabinet. In regards to vent placement, Eminence recommends symmetrical placement around the speaker. In this case, Hv represents the height of the vent, Wv represents the width, and Lv represents the length (or depth that extends into the cabinet).
Some of our recommendations do actually call for a rectangular vent shape. The length of the vent is represented by Lv. The diameter of the vent is represented by Dv. If you are looking at a ported or vented design (ported and vented have the same meaning), round vents are specified in most of our recommendations. No need to worry about the volume of the speaker and ports! That difference in volume is represented by Vb and has already been calculated. If the change is no more than 10%, it is probably not very crucial to include, as it should not significantly affect the end result. If the cabinet will have bracing and you want to be precise, be sure to account for the volume of the bracing and add it to the internal cabinet volume. This is the internal volume of your cabinet with no speaker in it. The main concerns are mechanical power handling (how much power a particular speaker will handle in a specific cabinet), how low the cabinet needs to play, and how much output you will need.įrom the Eminence cabinet designs, the box should be built to the Vtotal specification. You must decide how your speaker and cabinet should perform to meet your needs. There are trade-offs involved in cabinet design.
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Unfortunately, one magic, do it all enclosure for every speaker does not exist.
#Speaker enclosure design box vs cylinder pro
We provide multiple recommendations for all of our pro audio and bass woofers: please see the PDF’s on each product’s detail page. Our approach allows the designer/builder the flexibility to build any shape. For example, if we specify a rectangular box of “A” width x “B” height x “C” depth, someone may not be able to fit the “B” height where the cabinet needs to be installed. The reason for doing it this way is because we do not know what size or shape cabinet you need or want to build. We do not provide drawings with specific cabinet dimensions and details, but we do offer cabinet volume recommendations. Eminence is often asked to provide cabinet plans for our woofers.
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