INTRODUCTION
Built in adjustable crossover networks offering 12dB of slope, switchable to highpass, lowpass, bandpass, or full range. Panel Mounted Fuse for easy replacement. A line out has been provided to allow for expansion of your system which also features an adjustable crossover range of highpass, lowpass, or full range. Gold plated 5 way speaker binding posts allow for ease of connectability. This amplifier features the DPS (Dynamic Power Supply) system famous on all of our Series 218 amplifiers.

The DPSQ50 is NOT 2 ohm mono stable. While it may be used in 2 ohm stereo, if you hook-up this amplifier in 2 ohm mono it will DAMAGE the unit and VOID your warranty. For further information on this, or assistance to calculate your total speaker load impedance, please call our Tech Hotline.

(1) STATUS LED'S
GREEN LED: This indicator tells you that the unit has power and is turned on when lit. If this LED is on you know that you have correct polarity in your power hook-ups.
YELLOW LED: This indicator tells you that the unit has shutdown due to overheating. When the unit has cooled down to proper operating temperature this LED will go out. You may then turn the unit back on. Make sure you're not overdriving the unit and that it has plenty of airflow around it, to avoid the overheating problem.
RED LED: This indicator tells you that the unit has shutdown due to excessive current draw. This will occur if you have too low of speaker impedance, a shorted speaker, or a shorted speaker wire. When you have corrected the problem simply turn the unit off and then back on to clear this indicator.

(2) CHANNEL SET B CONTROLS
MODE SWITCH: This switch selects the crossover mode for Channel Set B left and right channels.
FREQUENCY ADJUST CONTROL: This control is used to set the range of the selected crossover mode frequency.
INPUT LEVEL CONTROL: This control is used to set the input sensitivity of Channel Set B. Use this control to match the voltage output of your source unit to the DPSQ50 inputs. In minimum position (fully counter-clockwise) the DPSQ50 will except an input of 5 volts RMS. In maximum position (fully clockwise) the DPSQ50 will except an input of 150 mVolts RMS.
RCA (phono) INPUT JACKS: This is where you connect your source unit to Channel Set B.

(3) CHANNEL SET A CONTROLS
MODE SWITCHES: These switches select the crossover mode for Channel Set A left and right channels.
BANDPASS ADJUST CONTROLS: These controls are used to set the range of the selected crossover mode frequency.
INPUT LEVEL CONTOL: This control is used to set the input sensitivity of Channel Set A. This control is used exactly as described above in the Channel Set B section.
RCA (phono) INPUT JACKS: This is where you connect your source unit to Channel Set A.

(1) LINE OUT AND CONTROL
RCA (phono) LINE OUT JACKS: These jacks allow you to connect this unit to another amplifier. This output is a line level connection.
MODE SWITCH: This switch selects the crossover frequency of the line out RCA jacks. The cutoff frequency of the line out is adjusted by the Highpass Adjustment of Channel Set A. This adjustment works only in highpass and lowpass modes.

(2) SPEAKER OUTPUTS
OUTPUTS: These 5 way binding posts are for connecting to your speakers. Be sure that if you connect this unit in bridged mono operation, that your impedance is not lower than 4 ohms or else you will damage the unit and void your warranty.

(3) POWER BLOCK
POWER BLOCK: This terminal is where you connect your Power, Ground, and remote turn-on wires to this unit.

(4) FUSEHOLDER
FUSEHOLDER and FUSE: This unit comes with a 25 amp ATC style fuse. If you must replace the fuse for any reason, be sure you use the same type and rating of fuse.

In addition to operating as a 4 channel amplifier, the DPSQ50 also has the capability of operating as a true high power 2 channel unit. To accomplish this, you need to open the amplifier case. Do this as follows:

1. Remove all connections from the unit (if it has already been installed).
2. Remove the 6 screws from the Control Plate face of the amplifier. (Two of them hold the RCA jacks to the plate.)
3. Turn the unit over so that the bottom plate is facing up and the control plate is facing you.
4. Remove the bottom plate by sliding it out toward you.
5. Now look for the little blue plastic jumpers. You will find them on the left, front corner of the PC Board, just behind the Channel Set A RCA input jacks.
6. Place both jumpers so that they connect each of the wires.
7. Replace the bottom plate and control plate and install the DPSQ50 in your vehicle.

By using the 2 Channel operation you won't have to buy extra splitters and have a messy installation if your source unit only has one set of line level outputs. This mode is also useful if you only plan to use the DPSQ50 just to drive your subs.

• Always set the Mode switches before you adjust the frequency controls. The frequency controls are used to further tailor the sound from your speakers.
• Make sure your signal cables are as far away as possible from any vehicle electrical wiring, and as far away as possible from your speaker cables.
• Make sure that all the components in your sound system are properly and securly grounded. This will help reduce noise caused by "ground loops".
• Always make sure your amplifier(s) have plenty of air circulation to prevent overheating. This will extend the life of the unit(s).

Fill in these handy facts on your system. This will help you to troubleshoot your system if anything goes wrong.

Enter your SERIAL NUMBER here:_______________________

Name of Authorized Dealer:______________________________________________

Date of purchase:_______________

Installation notes:

List the total per channel impedance load of your speaker system:_______________

List your other system components:_______________________________________

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No Sound: Check that the green power LED is on. If the green power indicator is lit, check all signal input and speaker connections. If the green power LED is not lit, check for +12 Vdc on +12 V and REM inputs and check for a solid ground connection on power connector. If yellow thermal LED or red currentLED are lit, see the status indicators portion of this manual.

Blows Fuses: Check all connections to be sure all power wires do not touch ground or each other. Be sure power connections are not reversed. Check internal transformer configuration for proper setting. Check input level control for proper setting.

Noise Problems: Be sure the metal sleeve on the RCA (phono) jacks does not touch the metal chassis of the vehicle, the heatsink of the amp, or the chassis of any other components in your installation. Route signal cables away from power wires, power connections, speaker wires, engine alternator, and vehicle firewall.