A Phase Linear Transmission Line Project
Section 2: Measurements Figure 2.1: Shows the complete system anechoic on-axis response. The LF response is tailored to fall off below 200Hz matching room gain. Figure 2.2: Shows the system response with the measured phase. The phase shift up to 300Hz is well behaved, above this the phase is essentially flat within ±15 degrees.
Figure 2.1. System response.	Figure 2.2. System response and phase
Figure 2.3. PLTL step response	Figure 2.4. Manger step response
Figure 2.3:  The step response of the speaker measured in the listening room. It is remenicent of responses found for the fameous Manger driver and the Quad ESL63 speaker (Figure 2.4 and 2.5.) It should be noted that the TL response would be cleaner if it were acquired in anechoic environments. The step response can be seen to fall off faster than the Manger/ESL63. This is a result of the AC coupling of the SB32 AWE sound card, the stimuli signal not being perfect. The time resolution of the impulse plots is 0.1 ms per unit.	Figure 2.5. Quad ESL63 step response
Figure 2.6. Right and left speaker	Figure 2.7. On-axis and off-axis 30deg.
Figure 2.6: Right and left speaker 1.5 meteres comparison. Figure 2.7: Measurements at 1.5 meters at angles 0 and 30 degrees, showing the good horizontal coverage resulting from the low crossover frequency.
[ Contents | Intro | Measurements | Optimization | Integration | Step Compensation | Time Align | Crossover | Construction ]