ML TQWT Design Worksheet - Acoustic and Electrical Response

12/20/03

Software :

by Martin J. King
e-mail MJKing57@aol.com

Reference :

Design and Construction of a Mass Loaded Tapered Quarter Wavelength Tube (ML TQWT)
Using the Fostex FE-164 Full Range Driver
by Martin J. King, 4/21/01

Unit and Constant Definition

Air Density :

Speed of Sound :

User Input (Edit This Section and Input all of the Parameters for the System to be Analyzed)

Driver Thiele / Small Parameters : Fostex FE-164 Properties

ML TQWT Geometry Definition (see Figure 7, pg 16 of the referenced article)

(Length of the ML TQWT)

(Driver Position Ratio)

(Area of the small end of the ML TQWT)

(Area of the large end of the ML TQWT)

(Stuffing density : 0 lb/ft³ < D < 1 lb/ft³)

(Radius of the port)

(Length of the port)

Transmission Line Definition

(0 lb/ft³ < D < 1 lb/ft³)

(n_closed > 1)

(n_open > 1)

Geometry Definition

Closed End of Transmission Line

(Driver ---> Closed End)

Section Length

Initial Area

Final Area

Stuffing Density

Open End of Transmission Line

(Driver ---> Open End)

Section Length

Initial Area

Final Area

Stuffing Density

Total Length of the Transmission Line

Resulting Acoustic Impedance for the Transmission Line

Velocity at the Terminus of the Transmission Line for a 1 m/sec Driver Excitation

Far Field Transmission Line System and Infinite Baffle Sound Pressure Level Responses

Woofer and Terminus Far Field Sound Pressure Level Responses

Transmission Line System and Infinite Baffle Impedance

Woofer Displacement

System Time Response for an Impulse Input