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Car Audio

Subwoofer Enclosures

Orders

The Order refers to the type of design. The number of the order will be increased by one if a passive low pass crossover (coil, also called a choke) is incorporated into the enclosure/subwoofer system.

Sealed Enclosures

Mounting the speaker in a completely sealed enclosure is a basic and simple application. When a volume of air in a sealed box is less than the Vas of the driver, the air trapped within acts as an acoustic spring to help control the speaker. Requires a speaker with a Qts between .3 and .9 and a Fs below 40 Hz.

Pro:
High power capability
Accurate enclosure size unneccessary
Smooth frequency respomse
Simple construction

Con:
More power needed


Sealed/Single Woofer Enclosure

sealed-enclosure_single_sub

 

Sealed/Dual Woofer Enclosure

dual-sealed-enclosure

 

Ported Enclosure

Known also as Bass Reflex, Tuned or Tuned Port enclosures. A sealed box with an opening that allows the back wave from the speaker to interact with the front. Changing the length or area of the opening, the tuning frequency of the enclosure is changed. Requires a speaker with a Qts between .1 and .4 and a low Fs (30-40 Hz).

Pro:
Deep Bass
Cone movement is minimal due to output controlled by port
High Output

Con:
Accurate specs for box size and port
Enclosure loses control of woofer below tuning frequency

 

Ported/Single Woofer Enclosuer

ported-enclosure-single-woofer

 

Vented Enclosures

Known also as Bass Reflex, Tuned or Tuned Port enclosures. A sealed box with an opening that allows the back wave from the speaker to interact with the front. Changing the length or area of the opening, the tuning frequency of the enclosure is changed. Requires a speaker with a Qts between .1 and .4 and a low Fs (30-40 Hz).

Pro:
Deep Bass
Cone movement is minimal due to output controlled by vent
High Output

Con:
Accurate specs for box size and port
Enclosure loses control of woofer below tuning frequency

 

Vented/Single Woofer Enclosure

vented-enclosure

 

Bandpass Enclosure

Single Reflex and Dual Reflex are two options available for these applications. In a bandpass enclosure, the woofer is mounted inside a box and all the sound exits out the port(s) of the box.

Pro:
Deep Bass
High Effecient on targeted frequency

Con:
Not Accurate and tight bass
Power Handling Low
Design larger and complex

 

Single Reflex/4th Order Enclosure

single-reflex-bandpass-one-port

 

Dual Reflex/6th Order Enclosure

dual-bandpass-6th-order-single-sub-dual-port

 

Dual Reflex/6th Order Enclosure

dual-bandpass-6th-order-dual-sub-dual-port

 

Single Reflex/Dual Woofers/4th Order Enclosure

single-refex-bandpass-2woofer-1port

 

Dual Reflex/Dual Woofers/6th Order Enclosure

dual-refex-bandpass-2woofers-3ports-6th_order

 

Isobaric

An isobaric configuration will consist is of two woofers in conjunction with one another to act as one. The woofer may be mounted face to face, back to back or front to back. An isobaric system requires only half the enclosure volume compared to what a single woofer would need. Because the Vas is half the single driver due to having two suspensions on the same diaphram, this setup requires only half the enclosure volume compared to the volume of a single woofer would require. The woofer must move in phase, move in the same direction, with one another. If the woofers are mounted front to back or back to back, one of the woofers leads must be reversed with respect to the other woofer.

Pro:
Tight accurate bass
Minimal room required
3db gain with same amount of space

Con:
Requires twice the power
2 Woofers needed

 

Reflex/Isobaric/4th Order Enclosure

isobaric_reflex_bandpass_2woofer_4th_order

 

Refex/Isobaric/6th Order Enclosure

isobaric_dual_reflex_2woofer_6th_order_2ports_top

 

Reflex/Isobaric/6th Order Enclosure

isobaric_dual_reflex_2woofer_6th_order_2ports

 

Reflex/Isobaric/4 Woofers/6th Order Enclosure

isobaric-bandpass-4-woofers-4th-order-enclosure

 

Reflex/Isobaric/4 Woofers/6th Order Enclosure

sobaric_dual_reflex_bandpass_4woofer_6th_order_3port

 

Reflex/Isobaric/4 Woofers/6th Order Enclosure

isobaric-dual-refex-bandpass-enclosure-4-woofers-6th-series-tuned

 

Infinite Baffle

By mounting speakers to a board and using the trunk as an enclosure. A tight seal is a must for this application to achieve quality performance. Requires a speaket with a Qts of .6 or more and a Vas lower than the volume of the trunk area available.

Pro:
Least space
Cost
Simple construction

Con:
More power needed
Least accurate

 

Seat/Deck Mount

infinite-baffle-freeair

 

 

 

 

 

 
 

 

 

 

 


 

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