Sub Filter Control
JBL DrivePack®
The Sub Filter control provides access to the device's DSP band-pass speaker processing block. There is one HP filter available in full range systems and two filters (one High Pass and one Low Pass) available in Sub-woofer systems.
Sub Filter Control button
Double clicking on the Sub Filter button will open the Band-pass Filter Processing sub control panel.
Bandpass Filter Processing - Full Range Systems
The Sub Filter control panel for full range systems is shown above. The High Pass filter frequency and filter type are edited via the spin control fields.
Filter Type
The drop down box for the filter type allows selection of the filter slope and style. The options are:
- HP Bessel 48dB/Oct
- HP Butterworth 6dB/Oct
- HP Butterworth 12dB/Oct
- HP Butterworth 18dB/Oct
- HP Butterworth 24dB/Oct
- HP Butterworth 30dB/Oct
- HP Butterworth 36dB/Oct
- HP Butterworth 42dB/Oct
- HP Butterworth 48dB/Oct
- HP Linkwitz-Riley 24dB/Oct
- HP Linkwitz-Riley 36dB/Oct
- HP Linkwitz-Riley 48dB/Oct
Frequency
The frequency control allows selection of the -3dB point for the filter, often called the knee of the filter. You can either adjust the frequency by using the numeric spin control or typing in the desired HP frequency directly into the edit field.
Bandpass Filter Processing - Subwoofer Systems
The Sub Filter control panel for subwoofer systems is shown above. The High Pass and Low Pass filter frequency and filter type are edited via the spin control fields.
Filter Type - High Pass
The High Pass filter block provides 17 filter types. The drop down box for the filter type allows selection of the filter slope and style. The options are:
- HP Bessel 48dB/Oct
- HP Butterworth 6dB/Oct
- HP Butterworth 12dB/Oct
- HP Butterworth 18dB/Oct
- HP Butterworth 24dB/Oct
- HP Butterworth 30dB/Oct
- HP Butterworth 36dB/Oct
- HP Butterworth 42dB/Oct
- HP Butterworth 48dB/Oct
- HP Linkwitz-Riley 24dB/Oct
- HP Linkwitz-Riley 36dB/Oct
- HP Linkwitz-Riley 48dB/Oct
Filter Type - Low Pass
The Low Pass Filter block provides 17 filter types. The drop down box for the filter type allows selection of the filter slope and style. The options are:
- LP Bessel 12dB/Oct
- LP Bessel 18dB/Oct
- LP Bessel 24dB/Oct
- LP Bessel 30dB/Oct
- LP Bessel 36dB/Oct
- LP Bessel 42dB/Oct
- LP Bessel 48dB/Oct
- LP Butterworth 6dB/Oct
- LP Linkwitz-Riley 24dB/Oct
- LP Linkwitz-Riley 36dB/Oct
- LP Linkwitz-Riley 48dB/Oct
Frequency
The frequency control allows selection of the -3dB point for the filter, often called the knee of the filter. You can either adjust the frequency by using the numeric spin control or typing in the desired HP frequency directly into the edit field.
Channel Selection Buttons
CH1 and CH2 select buttons are available on subwoofer systems where drivers are powered using discrete output channels of the JBL DrivePack® DP-3 power module. In these subwoofer applications the two channels are hard linked together thereby preventing output offset of the individual drivers.