Crown Audio IQ P.I.P.-DSP manual Shape Sets the response shape of the filter

IQ–P.I.P.–DSPProgrammable Input Processor with DSP for IQ Systems

filter is commonly used to feed the high frequency portion of an audio signal to horns or tweeters. It can be combined with a low-pass crossover filter to create a band-pass crossover filter for driving mid-range drivers.

Passband gain: Fixed at unity.

Frequency: Sets the –3 dB corner frequency of the filter. The range is 20 Hz to 20 kHz.

Shape: Sets the response shape of the filter.

Available response shapes are: 1st-order Butterworth, 2nd-order Butterworth, 3rd-order Butterworth, 4th-order Butterworth, 2nd-order Bessel, 3rd-order Bessel, 4th-order Bessel and 4th-order Linkwitz-Riley.

Parametric Equalization Filter Description: This filter boosts or cuts a relatively narrow frequency band like a band-pass filter. It is commonly used to correct specific anomalies in the response of drivers.

Passband Gain: Sets the amount of boost or cut for the filter. The range is +12 dB to –24 dB.

Frequency: Sets the center frequency of the filter. The range is 20 Hz to 20 kHz.

Q:Sets the width and slope of the filter. The range is 0.1 to 30. The lower the Q, the wider the filter and the better the transient response and visa versa. CAUTION: Avoid excessive Q’s.

Low-Pass Equalization Filter Description: This filter combines the functions of the parametric equalization filter to boost or cut a relatively narrow frequency band with a low- pass filter to roll of the frequencies above the center frequency. It is commonly used to create a B6 (6th-order Butterworth) response in a vented loudspeaker enclosure. Note: The low and high- pass equalization filters can be cascaded to form unique inter-order crossover-type filters.

Frequency: Sets the center frequency of the filter. The range is 20 Hz to 20 kHz.

Q:Sets the width, slope and gain of the filter. The range is 0.1 to 30. The lower the Q, the wider the filter, the lower the gain and the better the transient response and visa versa. Gain examples: A Q of 2 will result in 6 dB of gain at the center frequency and a Q of 4 will result in 12 dB of gain. CAUTION: Avoid excessive Q’s.

High-Pass Equalization Filter Description: This filter combines the functions of the parametric equalization filter to boost or cut a relatively narrow frequency band with a high- pass filter to roll of the frequencies below the center frequency. Note: The low and high-pass equalization filters can be cascaded to form unique inter-order crossover-type filters.

Frequency: Sets the center frequency of the filter. The range is 20 Hz to 20 kHz.

Q:Sets the width, slope and gain of the filter. The range is 0.1 to 30. The lower the Q, the wider the filter, the lower the gain and the better the transient response and visa versa. Gain examples: A Q of 2 will result in 6 dB of gain at the center frequency and a Q of 4 will result in 12 dB of gain. CAUTION: Avoid excessive Q’s.

Low-Pass Shelving Equalization Filter Description: This filter boosts or cuts low frequencies by the specified amount of gain. Note: When used to cut rather than boost, the filter acts like a high-pass rather than a low-pass filter. It has a fixed 1st-order slope (6 dB/octave).

Passband Gain: Sets the amount of boost or cut for the filter. The range is +12 dB to –24 dB.

Frequency: Sets the –3 dB corner frequency of the filter. The range is 20 Hz to 20 kHz.

High-Pass Shelving Equalization Filter Description: This filter boosts or cuts high frequencies by the specified amount of gain. Note: When used to cut rather than boost, the filter acts like a low-pass rather than a high-pass filter. It has a fixed 1st-order slope (6 dB/octave). It is commonly used to compensate for the natural high-frequencyroll-off common to constant directivity horns.

Passband Gain: Sets the amount of boost or cut for the filter. The range is +12 dB to –24 dB.

Frequency: Sets the –3 dB corner frequency of the filter. The range is 20 Hz to 20 kHz.

Note: 1st, 2nd, 3rd and 4th-order responses result in 6, 12, 18 and 24 dB/octave roll-offs, respectively.

Note: The filters are not disabled by the ASA control.

Reference Manual Page 19