Dbx DriveRack PA2 Manuel du propriétaire télécharger pdf (Page 45)

Crossover (XOVER)

A crossover is used to divide the broadband signal into separate frequency bands. This allows you to drive each loudspeaker or

driver in a sound system within its optimal frequency range. Using an active crossover, like that in the PA2, has the additional

benefits of increasing the efficiency of your power amplifiers, lowering intermodulation distortion, and in some cases, improving

the drivers’ transient response.

The crossover module in the PA2 can be configured for full range, 2-way, or 3-way operation. All outputs provide a band pass

filter (a combination of high pass and low pass filters) with selectable Butterworth or Linkwitz-Riley filter types and filter slopes

ranging from 6 dB/octave to 48 dB/octave.

When you select your main and sub speakers in the Setup Wizard, the PA2 will automatically configure the crossover for your

system. If tunings aren’t listed for your main or sub speakers, check the ever-growing online database using the DriveRack

PA2 control app to see if they’ve been added. If tunings cannot be found for your speakers, selecting the NOT LISTED option

for any such components will set safe and very usable crossover settings. These settings may work perfectly fine for you, but

if you would like to dig your heels in, know that you may be able to improve system performance by fine-tuning the crossover

parameters. See ‘Manual System Optimization Tips’ on page 18 for more information.

All outputs (LOW, MID, and HIGH) do allow you to overlap and roll out the crossover frequencies. This allows you to configure

multiple outputs for full range operation if required. There are some included factory presets in the PA2 already configured for

this type of operation. See ‘Preset List’ on page 55 to see a list of the available pre-configured factory presets.

Crossover Parameters

Each pair of outputs (i.e., LOW, MID, and HIGH) will contain their own set of parameters. The Crossover menu can be accessed

by pressing the XOVER button. You will see a list of the available band pass filters to select from. Which options are available

in the list will depend upon the current configuration. In all cases you will at least see the HIGH BAND. If you’ve configured

a 2-way system, you will also see a LOW BAND for the LOW outputs. If you’ve configured a 3-way system, you will see an

additional MID BAND for the MID outputs. Turn and press the DATA wheel to select the desired band. Turn the DATA wheel

to scroll through the list of parameters. Press the DATA wheel to edit a selection. When in the Crossover menu, pressing and

holding the XOVER button for approximately 2 seconds will advance to the next active crossover band from the list, wrapping

around through the available bands.

•

HP FREQUENCY [OUT, 16 Hz - 20 kHz]

Adjusts the cutoff frequency of the high pass filter.

• HP TYPE [BW 6, BW 12, BW 18, BW 24, BW 30, BW 36, BW 42, BW 48, LR 12, LR 24, LR 36, LR 48]

Selects the high pass filter type and slope rate per octave. BW stands for Butterworth. When two Butterworth filters are

summed, a 3 dB increase in level will be created at the crossover frequency. LR stands for Linkwitz-Riley. When two

Linkwitz-Riley filters are summed, there is no increase in level around the crossover frequency, which makes these type of

filters very popular.

• GAIN [-60 dB to +20 dB]

Adjusts the output level for the selected band.

• LP FREQUENCY [16 Hz - 20 kHz, OUT]

Adjusts the cutoff frequency of the low pass filter.

• LP TYPE [BW 6, BW 12, BW 18, BW 24, BW 30, BW 36, BW 42, BW 48, LR 12, LR 24, LR 36, LR 48]

Selects the low pass filter type and slope rate per octave. BW stands for Butterworth. When two Butterworth filters are

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Dbx DriveRack PA2 Manuel du propriétaire Page 45