dbx Pro 260 user manual Notch Filters, Crossover, Post-CROSSOVER PEQ

DriveRack™	Detailed Parameters		Section 4
		4.6 Notch Filters

The notch filter is the perfect tool for dropping out undesirable frequencies that may appear in the input signal. Up to six Notch filters are available for all six outputs.

Notch On/Off

Turns the notch filters on and off.

Frequency (1 to 6) 20 to 20K

Selects the desired notch filter frequency of the selected notch filter.

Gain -36 to 6 dB

Sets the level of the selected notch filter. Set to +6dB to help find unwanted feedback, then set to -3dB to -36dB to remove.

Q 16 to 128

Selects the Q of the selected notch filter.

4.7 Crossover

The Crossover is used to divide the input signal into several frequency bands. This allows the user to drive the speaker in its optimum frequency range and send each output separately for more efficient use of amplifier power. The 260 DriveRack Crossover can be configured as a 2x3, 4, 5, or 6. Appendix A.5 illustrates each of the available crossovers. The High-Pass or Low-Pass filter being edited is indicated by the highlighted edge in the graphics area.

Frequency

Adjusts the frequency of the Low Pass filter from 20 to 20KHz.

Type

Selects the filter type. Selections are: BS 6, 12, 18, 24 Bessel type filter, BW 6,12,18,24 for Butterworth type filter with slope of 6, 12, 18 or 24 dB/Octave and LR12, 24 for Linkwitz- Riley type with slope of 12 or 24 dB/Octave.

Gain

Sets the level of the selected crossover band. Range is from Infinity to +20dB.

4.8 Post-CROSSOVER PEQ

In addition to the pre-crossover EQ options within the signal path, the 260 DriveRack also offers a 2 or 3-band parametric EQ after the crossover section. The parameters for the post-crossover EQ are as follows and are user adjustable.

PEQ On/Off

Turns the PEQ band on and off.

The following figure shows the constant Q parametric filter.

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DriveRack™ User Manual 33