Polk Audio - Car & Marine Audio Speakers

Driver Properties
Name	MM2124 (4 ohm)
Diameter	12 in.
No. of Drivers	2
Fs	31
Qms	13.66
Vas	2.25 cu.ft. / 63.71 L
Xmax	.37 in / 9.5 mm
Sd	80.39 sq.in. / 518.6 sq.cm
Qes	.54
Le	2.42 mH
Z	4 ohm
Pe	800



Box Properties
Type	Dual Bandpass
Shape	Rectangular
Comment	Use 3/4 inch MDF for box building material
Enclosure details	3.88 cu. ft. (110.01 liters)

Overall External Dimensions
Width	35-41/100" (89.94cm)
Height	16" (40.64cm)
Depth	17" (43.18cm)

Chamber 1

Vb = 1.13 cu.ft. (32.00 liters)
Fb = 66.36 Hz.
QL = 7
F3 = 36.94 Hz.
Fill = Minimal Polyfill

Chamber 2

Vb = 1.62 cu.ft. (46.01 liters)
Fb = 62.47 Hz.
QL = 7
F3 = 105.40 Hz.
Fill = Minimal Polyfill

No. of Vents = 3
Vent Shape = Round
DV = 4.00 in. (10.16cm)
LV = 9.00 in. (22.86cm)

Chamber 3

Vb = 1.13 cu.ft. (32.00 liters)
Fb = 66.36 Hz.
QL = 7
F3 = 36.94 Hz.
Fill = Minimal Polyfill

Detail Enclosure Images

Internal view showing driver orientation and port instillation.

Actual Measured Performance

Anechoic chamber response

In car response

*** As measured with a in-house car with 1 Volt input. Actual results may vary with different vehicles.