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    A New Way of Looking at Speakers and Rooms - Review of APL TDA

    Next, we will look at the same waveforms in the presence of a reflection delayed by 5 ms. and down only 3 dB. The TDA 3D display shows twin blades at high frequencies, with the direct response blade bending towards the reflection as the mid-bass is approached. Figure 31 Undistorted PFR...
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    A New Way of Looking at Speakers and Rooms - Review of APL TDA

    Probing the Limits of TDA’s Ability to Discriminate Reflections from the Direct Response To be useful for evaluating crossover timing using indoor measurements and in guiding equalization, TDA must be able to discriminate against reflections. What are the limitations on TDA’s ability to do...
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    A New Way of Looking at Speakers and Rooms - Review of APL TDA

    Non-linear Distortion Analysis TDA can show harmonic distortion relative to the fundamental or as a percentage. Examples are shown below. Figure 17 NLDA Graphs Conclusion APL_TDA has become my favorite tool for evaluating my DIY speaker efforts in room, the listening position itself, and the...
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    A New Way of Looking at Speakers and Rooms - Review of APL TDA

    FFT-Q Window Analysis Frequency, group delay, and phase delay response curves can be viewed with varied FFT-Q window settings to remove reflection interference from the frequency, phase, and group delay response graphs. The controls for FFT-Q window analysis are below the lower left corner of...
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    A New Way of Looking at Speakers and Rooms - Review of APL TDA

    Controlling and Configuring TDA The discussion so far has been focused on the unique2D and 3D maps of APL_TDA. Let’s look at its controls and see how else it can present measurement data. Figure 9 TDA's main screen showing an IR log display In the upper left hand corner of the main screen...
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    A New Way of Looking at Speakers and Rooms - Review of APL TDA

    The Speaker Measured at the LP When the mic is moved out to the primary LP, 4m from the corner speakers, the room dominates the measurement, especially in the lower registers. The TDA display isn’t as pretty a picture there but then it’s an untreated room. Nevertheless, the direct response...
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    A New Way of Looking at Speakers and Rooms - Review of APL TDA

    Introduction TDA, from Acoustics Power Labs, provides a new way of looking at the responses of speakers in rooms. Its Intuitive 3D Display of sound level vs arrival time and frequency spotlights speaker and room anomalies. An impulse response shows energy arrival over time; TDA shows both the...