Overview: The DQDX is a 6-channel active DSP with built-in
signal delay circuitry, equalizer, and electronic crossover.
Input Gain: The input gains for the front, rear, and subwoofer
channels are set independently. A clipping indicator LED helps you match the input
setting on the DQDX to the output of the source unit.
Output Level: There are also separate line level outputs for
the front, rear, and subwoofer channels, and another LED helps you maximize the
output level without clipping the signal.
Balanced/Unbalanced Input: This is typically left in the
unbalanced (factory) position. If the source unit looks for a ground through
the RCA cables, the ground loop will likely introduces noise into the system.
Switching the input jumper to balanced might remove it.
Subsonic Filter: The PFM (Programmed Frequency Match) jumper
sets the subsonic filter frequency on the subwoofer output; choose 20 Hz, 30 Hz,
or Off (factory position).
Ground Isolation: The power supply ground is switchable, in
case of ground loop noise. The factory position is fully isolated (typically the
best choice), but can be changed to Ground or 200Ω.
Front to Sub Jumper: If the source unit has only front and
rear RCA outputs, set the Front to Sub jumper to On to feed the subwoofer output
from the front input.
Crossover: The crossover routs the high-pass signal to the
front and rear outputs, and the low-pass signal to the subwoofer output. The
crossover point options are 50 Hz, 60 Hz, 65 Hz, 70 Hz, 75 Hz, 80 Hz, 85 Hz,
90 Hz, 95 Hz, 100 Hz, 125 Hz, 150 Hz, 175 Hz, 200 Hz, 250 Hz, 300 Hz, 400 Hz,
and 500 Hz.
Time Alignment: By delaying the left speaker output a few
milliseconds, the Signal Delay feature lets you effectively center the listener
(driver) between the left and right speakers, thus optimizing the sound stage.
The Signal Delay feature also allows adjustment of the front speaker output
relative to the subwoofer, to effectively bring the subwoofer forward in the
car. AudioControl offers a free set-up app for iPhone and iPad, available at the
Equalizer: The front, rear, and subwoofer outputs have
independent 7-band equalizers. The front and rear EQ bands are centered at
125 Hz, 175 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, and 8 kHz. The subwoofer bands
are centered at 31.5 Hz, 40 Hz, 50 Hz, 63 Hz, 80 Hz, 100 Hz, and 125 Hz. Each
dial is continuously variable from -12 dB to +12 dB and there's a notch at the
center position so it's easy to return to the flat setting.
Pink Noise Generator: A pink noise generator is built-in to
help set the equalizer when using an RTA.
Remote: The included ACR-3 wired remote gives you easy
access to the subwoofer output level. The remote is also used to program the
Signal Delay circuit, and to bypass the signal processor, for an A/B comparison
with and without the Signal Delay, equalizer, and crossover circuits. The remote
is designed to be dash mounted, within reach of the driver; it can be mounted
under the dash with the supplied bracket, or the bracket can be removed and the
knob and LEDs can be custom mounted through the dash. Dimensions:
- Width: 2.558"
- Height: 1.477"
- Depth: 1.811" (2.465"
Input/Output Level: The input gains and output levels are
set independently for the front, rear, and sub channels. To help correctly set
the input, a Maximized LED lights to indicate the input is just below clipping.
The adjustable output level allows you to increase the source line voltage to
the top of your amplifier's input range; up to 7.5 volts RMS.
Terminal Block: The power terminal is removable; the wiring
is attached to the block, then the block is plugged into the DQDX. Each terminal
block will accommodate wire up to 12 gauge.
- Maximum Output: 7.5 volts RMS
- EQ Gain: +/-12 dB
- Frequency Response: 10 Hz-22 kHz
- THD: 0.01%
- Input Impedance: 20 kΩ
- EQ Frequencies: adjustable from -12dB
- Front/Rear: 125 Hz, 175 Hz, 250 Hz, 500
Hz, 1 kHz, 2 kHz, 8 kHz
- Sub: 31.5 Hz, 40 Hz, 50 Hz, 63 Hz, 80 Hz,
100 Hz, 125 Hz,
- Signal Delay:
- Left/Right: 10ms max
- Front/Sub: 35ms max
- Crossover Frequencies: 50 Hz, 60 Hz,
65 Hz, 70 Hz, 75 Hz, 80 Hz, 85 Hz, 90 Hz, 95 Hz, 100 Hz,
125 Hz, 150 Hz, 175 Hz, 200 Hz, 250 Hz, 300 Hz, 400 Hz,
500 Hz, and defeat
- Crossover Slope: 24 dB/octave (Linkwitz-Riley)
- Output Impedance: 150 ohms
- Current Draw: 350 mA
- Recommended Fuse: 2 amp
- Remote Trigger Output: 1 amp max