User manual version 1
AV dsp amp
Orange, thick
Response of selected biquad
Black, thick
Sum response
Having all of these on at the same time quickly produces an intractable mess so
these graphs can be separately enabled or disabled in the filter definition
area.
The impulse or step tabs show the time domain response of the imported drivers
and the sum response, and are used to demarcate the anechoic portion.
Filter Definition Area
The three channel tabs, labelled Tweeter, Woofer and Subwoofer are
functionally identical. The top left frame is used to import response files.
The select button opens a file. The show checkbox turns display of the
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”
“
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measured graph on or off. The Common Settings box controls global gain (for
each channel), delay, and the visibility of plots.
The amplified channels have up to 12 biquads, selected using the Biquad
“
Section radio buttons in the middle. The Subwoofer lineout has only 6 biquads
”
sections, for only simple filter settings. To the right is a settings area
specific to the type of function selected. Unused biquads are set to unity.
The selected biquad is edited by selecting a function and setting relevant
parameters.
The delay has a maximum value of 1000us for channel 1 and 2. The subwoofer
channel does not include any delay. Distance is calculated by
soundspeed/delay=distance, maximum distance is therefore
340,29meters/0,001secondes=34,029cm. Note that the minimum step-size is
0,708cm cause the sample rate of 48000.
Settings window
The settings window is under File > Settings Measurement sampling rate sets
…
the sample rate used in the imported response files (typically 48kHz).
Processor sampling rate is that of the DSP hardware. Note that this setting
does not control the sampling rate of the hardware. Rather, it informs the
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