DS18 XOHV High Volt External Pre-Amplifier Owner’s Manual

DS18 XOHV High Volt External Pre-Amplifier

THANK YOU FOR PURCHASING THIS PRODUCT.

• Please read this owner’s manual in its entirety before operating this equipment.
• After reading this manual, keep it handy, such as in your glove compartment.

FEATURES

The XOHV is a 2 channels Pre-Amplifier with Crossover and selectable bass boost frequency with high volt input and output, perfect for H-V amplifiers that does not have this controls built-in, with the 2 channels you can match and adjust 2 or more amplifier with same audio settings for big / competition audio systems.

• Perfect for Hi-Volts Amplifiers
• Hi-Volt RCA Input and output up to 9 volts.
• Bass Boost adjustable on frequency and intensity.
• LED Clip indicator for input and output.
• Input Gain Adjustable.
• Low Loss Tiffany RCA.
• Remote output with delay to avoid noises.
• Input Ground Selectable
  (Ground/200 ohm/Insulated).

WHAT’S INCLUDED IN THE BOX

In addition to this manual, the box contains:

• XOHV Pre-Amplifier
• 1 Power Connector
• 4 Phillips-head screws

PRECAUTIONS

• Do not operate this product in ways other than those described in this manual.
• Do not disassemble or modify this unit.
• Do not pour liquid or poke foreign objects into the unit. Water and humidity may damage internal circuitry.
• If the unit becomes wet, turn off all power and ask your authorized dealer to clean or service the unit.

Failure to observe these precautions may damage your car, the monitor, or the video source, and may void the warranty.

INSTALLATION

Installation of mobile audio and video components requires experience with a variety of mechanical and electrical procedures. Although this manual provides general installation and operation instructions, it does not show the exact installation methods for your particular vehicle.
If you do not have the required knowledge and experience to successfully complete the installation, consult an authorized dealer about professional installation option.

WARNING! Changes or modifications to this product that are not approved by the manufacturer will void the warranty and will violate FCC approval.

INSTALLATION AND WIRING

Read these instructions and the following precautions carefully.

BEFORE STARTING

Mounting Precautions
This XOHV can be mounted next to the Amplifier or the Head unit, the front panel control should be easily accessible any time. In addition:

• This unit requires additional mobile audio components for proper operation.
• Always use great care when attaching anything to a vehicle! Check clearances in front of, behind, and on both sides of the planned installation before drilling any holes or installing any screws.
• This unit is exclusively for vehicles with a negative ground, 12V battery system.
• A good chassis ground connection is critical to minimize resistance and avoid noise problems. Use the shortest wire possible and securely connect it to the car chassis and the source unit ground.
• When routing RCA cables, keep the cables away from the power cables and output speaker wires.
• If you are using a source unit without a remote turn-on lead, the XOHV can be turned on with a switched accessory lead. This accessory power source is located in the factory harness at the back of the radio. This lead turns on and off with the ignition key.

TOOLS AND ADDITIONAL COMPONENTS YOU WILL NEED:

• A Phillips-head screwdriver when mounting the unit in the vehicle.
• A small flat-head screwdriver to tight on the power input connector wiring.
• High-quality RCA input and output cables. Extra cable can cause signal loss and act as an antenna for noise. Use only high quality RCA cables that are no longer than necessary to make a direct connection with the source unit and amplifiers.

WARNING PRECAUTIONS
Disconnect the ground(-) terminal on the vehicle’s battery.

PARTS DESCRIPTION

1. RCA Output: Low level signal output terminal, connect this to RCA input terminal of the amplifier(s)

2. Power Input Terminal:
   GND: Used to connect grounding cable. The power supply grounding cable need to be firmly connected to the Negative post from the battery or connect to frame of the vehicle near the installation position of the pre-amplifier. Please use the cable with same specifications as the power supply (positive).

   • +12V: Used to connect the positive terminal 12V car battery. To ensure adequate power supply for the Pre-Amplifier, special cable should be used to connect directly, to the positive pole of the battery, and the fuse should be connected in series within 20 centimeters from the positive pole of the battery.
   • REM IN: Connect it to the “REMOTE” control output Signal from the head unit. The Pre-Amplifier will switch on/off automatically with Radio on/off.
   • REM OUT: It provides separate REMOTE signal output to the amplifiers, this signal it is delayed and controlled to avoid POP noises in the system.
     Note: the starting signal of the external power amplifier must be taken from the REM OUT terminal of this equipment.

3. HPF: High Pass Filter, Adjust the frequency setting of the high pass crossover. Frequencies lower than the setting will be filtered out of the audio signal.

4. LPF: Low Pass Filter, Adjust the frequency setting of the low pass crossover. Frequencies higher than the setting will be filtered out of the audio signal.

5. Gain: Level sensitivity adjust the pre-amp sensitivity input level. The minimum sensitivity level is 1V, while the maximum level is 7.5V.

6. Boost Freq: Adjust the Bass Boost Frequency point, the frequency range is from 25Hz to 100Hz.

7. Boost: Adjust the Bass Boost level up to 18dB.

8. Power: LED Indicator that shows when the Pre-amplifier is on and in proper working condition the red LED will illuminate. Refer to the troubleshooting guide for possible solutions if this will not power on.

9. Clip: Clipping usually happens because the gain is set too high in an attempt to maximize the amp’s output potential. When the gain is set too high for the application the Pre-amp will produce a squared or clipped sound wave, and the amp and the speakers connected to it will generate a large amount of heat trying to reproduce the clipped signal. This can result in catastrophic damage to your equipment. Follow these simply steps to avoid problems with your system: Once your Pre-amp is set up, watch the CLIP indicator light. If you see the light blinking turn the gain down, when the CLIP indicator goes off, you’re no longer clipping. Our clipping indicator is as accurate as an oscilloscope, but also it gives you the ability to monitor the dynamic source material we call music in real-time.
   TIPS: If you set your gains with an oscilloscope, it’s all good until some factor in your system changes. This change could be in head unit volume, charging system voltage, source recording level, etc. If any of these factors change from when you initially set your gains, the amplifier’s clipping point will change as well.

10. RCA Input: RCA Audio Input Connection Using high-quality shielded stereo RCA cables, connect the source signal to the Pre-amplifier RCA inputs.

11. INPUT GROUNDING: This is an input impedance jumper It is located inside the device and requires removing the 4 screws on the cover, make sure you have turned off the system before making these changes, for most systems you can leave this jumper set in the GND position. In some systems, the source unit may look for a ground through the RCA connection to the amplifier and create a ground loop, which can cause a whine. In this case, you should change the two jumpers to the 100 ohm or 100K ohm position.

CARE AND MAINTENANCE

Cleaning the cabinet
Use a soft, dry cloth to gently wipe dust and dirt from the unit.
Do not use benzene, thinner, car cleaner, or’ ether cleaners. These substances may damage the unit or cause the paint to peel.

SERVICING THE EQUALIZER CROSSOVER UNIT
In the event that trouble arises, never open the case or disassemble the unit. The internal parts are not serviceable by the user. Opening any components will void the warranty.

TROUBLESHOOTING

THE UNIT DOES NOT WORK; NO LIGHTS
The power wires may not be connected. Check the power and ground wiring, the retest.

SOUND IS DISTORTED

• The source unit volume may be set too high. Reduce the source unit volume.
• Equalizer gain controls are set too high. Turn the equalizer controls to the center position and listen for distortion again. If the problem still occurs, see your authorized dealer.
• Speakers may be damaged. Consult your authorized dealer.

NO SOUND COMING FROM THE UNIT
No remote-on. Using a voltmeter, check for + 12V from the remote-on source.

MEASUREMENTS

SPECIFICATIONS

AUDIO
Frequency Response………………………………………………15Hz – 20KHz
Signal to Noise Ratio ……………………………………………………………100 dB
Total Harmonic Distortion (THD)  ………………………………0.02 %
Stereo Signal Separation …………………………………………….. 85dB
Low Level Input Range …………………………1.6 – 9 Volts
High Pass Filter Range……………………………………. 15Hz – 10 KHz
Low Pass Filter Range ……………………………………. 50Hz – 20 KHz
Crossover Slope ……………………………………………………………. 12dB/Oct
Bass Boost Range ………………………………………………………..0~18dB
Bass Boost Frequency ………………………………………..35~125Hz
RCA Pre-Output Voltage at 12.8V ……………7 Volts
RCA Pre-Output Voltage at 14.4V…………….9 Volts

FEATURES

Number of Channels …………………………………………………. 2 (Left and Right)
Led Indicator …………………………………………………………………………….Power / Clip
Power Input Terminal Size  …………………14 Ga
Recommended Fuse Size …………….. up to 1A (external)
Remote Output ……………………………………………………………………….Yes, (250mA)
Tiffany RCA…………………………………………………………………. Yes, (Input and Output)
Input Ground Selector…………. Yes, (Ground/200 OHM/Insolated)

MEASUREMENT
Overall Length………………………………………………………………………5.9″ / 150mm
Overall Width ………………………………………………………………………. 3.28″ / 83.5mm
Overall Depth  ……………………………………………………………………… 1.1″ / 28mm
Body Length  ………………………………………………………………… 4.86″ / 123.5mm
Body Width …………………………………………………………………… 2.42″ / 61.7mm
Gross Single Unit Weight ……………………………………………….. 9.4oz

WARRANTY
Please visit our website DS18.com for more information on our warranty policy.

We reserve the right to change products and specifications at any time without notice.
Images may or may not included optional equipment.

WARNING:
Cancer and Reproductive Harm. www.P65Warning.ca.gov

GLOSSARY

• Crossover: A device that limits the range of frequencies sent to a speaker or amplifier.
• Equalization: The process of boosting or cutting sound signal frequencies to improve the quality of the sound. The term comes from the filters used to add back high frequencies at the receiving end of analog transmissions over wires.
• Equalization band: The frequency range impacted by a specific filter.
• dB: Decibel, a measurement of the relative difference in power or intensity between two acoustic signals
• Gain control: Gain is the amount of amplification (voltage, current or power) of an audio signal expressed in dB
• Graphic equalizer: A multi-band variable equalizer that uses mechanical controls to adjust amplitude.
• Hz: Abbreviation for Hertz, a unit of frequency equal to one cycle per second.
• Octave: The musical principle of dividing sound frequencies into the eight notes of the musical scale.
• OEM: Original Equipment Manufacturer
• RCA input/output: Port through which sound travels in and out of the system; “RCA” refers to the type of connector, which was originally manufactured by Radio Corporation of America.
• Slope: How fast the sound changes rated in dBs. The higher the dB number, the faster the frequency drops off.

References

• Official DS18 Pro Audio Store - Speakers, Subwoofers, Amps & More!

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>