The Harmonics graph illustrates the advantage of using the Aeroport over a conventional tube. The human ear can sense .1% distortion. A standard tube can reach that amount with only 10 watts of input where as the Aeroport reaches only .05% distortion with 50 Watts of input. The end result? You can apply more input power with less distortion or use a smaller diameter Aeroport in place of a standard tube.
If using a computer aided speaker design program such as
CA L C U L AT I N G PO R T LE N G T H
After the enclosure has been designed, the following formula may be useful when calculating the port length:
Lv = | 8466.4R2 |
(Vb)Fb2
Lv = port length in inches
Vb = volume of box in cubic feet Fb = tuning frequency
R = radius of port
RP9314 RP9316
Radius
>Radius >
R=1.34 R=2.03
When cutting the Aeroport center tube, the length should be cut 3"
shorter than calculated. When the end flanges are affixed, each end extends the tube one and a half inches. If the determined port length is 10" then the fully assembled Aeroport (center tube with flanges attached) should measure 11" (the extra 1/2" on each end contributes to harmonics and not the length of the tube).
11" Overall Length
10"
Standard Tube
7" Cut Length
Aeroport Tube
2
