Overview: The dbx DriveRack PA2 is a complete management
system for optimizing loudspeakers at your live audio gig. The PA2 is designed
for use by bands and musicians who carry their own PA system, and for setting up
installed sound systems. It can be setup and operated from a compatible tablet
or smartphone via Ethernet using the free dbx PA2 Control App. The PA2 takes up
1U of space in a standard equipment rack.
PA2 Control App: The free dbx DriveRack PA2 Control application is
available for Android, iOS, Mac, and Windows PC devices. It can be used to
perform the same functions available from the PA2's front panel, including
running all Wizards, changing configurations, viewing the RTA, editing system
and processing parameters, and managing presets. With an internet connection,
you can also access online tuning and preset databases, share your own presets
and tuning, and download additional tunings from Crown, JBL, and other PA2
users. The app can be downloaded from the iTunes Store, the Google Play, and
Wizards: The Wizards help you configure your system using simple
step-by-step instructions. With the optional
RTA-M measurement microphone, the Wizards can optimize your sound system,
helping you adjust left/right speaker balance, low/mid/high level balance, and
analyzing your room and applying accurate room EQ and feedback suppression. This
is much faster than setting up the system manually. You can choose to run all
Wizards, run only the setup Wizards, or individual Wizards (Input Setup, Graphic
EQ Setup, Speaker/Amp Setup, etc.)
Note: The PA2 has an XLR input on the front panel to accommodate
the optional RTA-M measurement microphone.
AutoEQ: The PA2's built-in AutoEQ Wizard can quickly and easily
analyze the room and equalize your sound system. This new AutoEQ provides
professional touring-quality room EQ, and fast Advanced Feedback Suppression (AFS).
If you feel you need to fine-tune the system after running the AutoEQ, you can
EQ the system by ear using the Graphic EQ (GEQ).
Graphic EQ (GEQ): The 31-band Graphic EQ lets you manually tune the
sound system, either on its own, or in conjunction with the AutoEQ. Built-in GEQ
"Quick Curves" (Manual, Flat, My Band, Speech, Performance, and DJ) can be used
to quickly change the frequency response of the system, then manually edited if
further adjustments are needed. Each of the 31 bands (from 20Hz to 20kHz) can be
adjusted from -12dB to +12dB in 0.1dB increments.
Parametric EQ (PEQ): There are two types of PEQs available in the
DriveRack PA2: the AutoEQ PEQ and the Output PEQs (Low, Mid, High). The 8-band
AutoEQ PEQ is on the input processing side, and is automatically adjusted by the
AutoEQ Wizard. The 8-band High, Mid, and Low PEQs are on the output side, and
are designed for speaker tuning. There are three Band Types (Bell, Low Shelf,
and High Shelf), and 8 Bands between 20 Hz and 20 kHz. Each band can be adjusted
as follows: Gain (-12dB to +12dB), Q (0.1 to 15.909), and Slope (3dB/octave to
Other Signal Processing: In addition to the built-in EQs,
the DriveRack PA2 features the following input and output processing:
- dbx Compression: Compression is used to raise lower
level portions of the signal, and restrict the higher level portions of the
signal. You can adjust the threshold (-60dB to 0dB), Ratio (1:1 to Inf:1),
Gain (-20dBu to +20dBu), and the "knee" region (Overeasy)(Off, 1-10).
- dbx Subharmonic Synthesis: Subharmonic synthesis
processing enhances the low frequencies. You can adjust the overall level of
the subharmonics, or the levels in the 36-56Hz and 24-36Hz bands.
- dbx Limiting: A limiter is used to set a ceiling on the
signal level, preventing the signal from exceeding a predetermined
threshold, preventing overdriving the equipment. You can adjust the
Threshold (-60dB to +60dB) and the "knee region" (Overeasy) from 0 to 100,
- Driver Alignment Delays: There are two types of delay:
Input (pre or backline) delay and the Output (driver alignment) Delay for
Low, Mid, and High Outputs. You can adjust the delay length for each type in
milliseconds (0 to 100ms), feet (0 to 112.7'), or meters (0 to 34.3m).
- Crossover: The Crossover divides the signal into
separate frequency bands, allowing you to drive each loudspeaker or driver
with its optimal frequency range. You can choose between a Butterworth
filter (at slopes of 6, 12, 18, 24, 30, 36, 42, or 48 dB/oct) and a Linkwitz-Riley
filter (12, 24, 36, or 48 dB/oct) in high-pass or low-pass between 16 Hz and
20 kHz. The gain is variable from -60dB to +20dB, and the polarity can be
set to normal or inverted. The crossover configuration is shown below.
Crossover Configurations: The DriveRack PA2 has 2 inputs and 6 outputs.
You can use a single (Mono) input or a left/right stereo input from the mixer.
Connections are made to the low, mid, and high outputs according to the
- Full Range Applications: The PA2 sends full range signals
(20Hz-20kHz) through the High Outputs. The output can be sent to two
full-range powered speakers, a mono powered subwoofer/two powered satellite
speaker system, or multiple powered full range speakers.
- 2-Way Application: The PA2 splits the signal into two frequency
bands and sends all lower frequencies from the Low Outputs to the Sub
amplifier, and all upper frequencies from the High Outputs to the amplifier
driving the full-range Main speakers. This can also be used for bi-ampable
main speakers with no subs.
- 3-Way Application: The PA2 splits the signal into three frequency
bands, sending signals out of the Low, Mid, and High outputs to amplifiers
driving left/right subwoofers (low) and bi-ampable left/right mains
Firmware Updates: The PA2's firmware can be updated through
a variety of methods. Connecting the USB connector on the back panel to a
Windows PC allow you to update the firmware using an Update Utility application.
A firmware update can also be performed through the DriveRack PA2 Control app,
connecting through the Ethernet port.