1. Ynlieding
Thank you for choosing the Zapco ST-1000XM III Monoblock Class D Amplifier. Dit amplifier is designed to deliver high-quality audio performance for your vehicle's sound system. Please read this manual thoroughly before installation and operation to ensure proper use and to maximize the amplifier's potential.
The ST-1000XM III is a single-channel, Class D bass amplifier featuring a new aluminum chassis, variable input gain control, variable electronic crossover, variable subsonic filter, variable bass boost control, variable center frequency for bass boost, and variable phase control. It is also strappable for use with a second amplifier on a single voice coil and includes a dash-mount remote gain control.
2. Safety Information
Nim altyd de folgjende feilichheidsmaatregels yn acht by ynstallaasje en gebrûk:
- Disconnect the vehicle's battery negative terminal before starting any installation.
- Soargje derfoar dat alle bedrading goed lein en befeilige is om skea of koartsluting te foarkommen.
- Use appropriate gauge wiring for power, ground, and speaker connections as specified.
- Ynstallearje de amplifier in a dry, well-ventilated location, away from direct sunlight, heat sources, and moisture.
- Net operearje de amplifier if it is damaged or malfunctioning. Refer servicing to qualified personnel.
- High sound pressure levels can cause permanent hearing loss. Adjust volume levels responsibly.
3. Opset en ynstallaasje
Proper installation is crucial for optimal performance and safety. If you are unsure about any part of the installation process, consult a professional installer.
3.1 Montage fan de Amplibbener
Kies in feilige, droege en goed fentilearre lokaasje foar it ynstallearjen fan de amplifier. Ensure there is sufficient airflow around the heatsink. Use the provided mounting hardware to secure the amplifier firmly to a solid surface in your vehicle.
3.2 Wiring Ferbinings
Refer to the diagram below for proper wiring connections.

Figure 1: Rear panel connections for power, ground, remote, fuses, and speaker output.
- Strom (BATT +12V): Connect a heavy-gauge wire (e.g., 4 AWG or larger, depending on cable length) directly from the vehicle's positive battery terminal to the +12V terminal on the amplifier. Install an appropriate fuse holder (not supplied) within 18 inches (45 cm) of the battery.
- Grûn (GND): Connect a heavy-gauge wire of the same size as the power wire from the GND terminal on the ampfersterker oan in skjin, ûnferve metalen oerflak op it chassis fan it auto. Soargje foar in goede elektryske ferbining.
- Op ôfstân (REM): Ferbine in tried mei in lytsere dikte (bygelyks 18 AWG) fan 'e REM-terminal op' e ampfersterker nei de útgong foar ôfstânsbetsjinning fan jo haadienheid. Dizze tried draait de amplifier on and off with your stereo.
- Fuses: De amplifier is equipped with internal fuses. Ensure these are correctly rated (refer to specifications). Do not replace with higher-rated fuses.
- Speaker Output: Connect your subwoofer(s) to the SPEAKER OUTPUT terminals. Observe correct polarity (+ to + and - to -). This is a monoblock amplifier, ûntworpen foar in ienkanaalsútfier.
- Ynfier (RCA): Connect RCA cables from your head unit's subwoofer or full-range pre-out to the IN (RCA) terminals on the amplibbener.
- Remote Gain Control: Connect the included remote gain control to the 'REMOTE' port on the amplifier's front panel. This allows for convenient bass level adjustment from the driver's seat.
4. Operating Controls and Adjustments
The Zapco ST-1000XM III features several controls to fine-tune your audio system. Refer to the diagram below for control locations.

Figure 2: Front panel controls for audio adjustments.
- POWER/PRT Indicators: The POWER LED indicates the amplifier is on. The PRT (Protection) LED illuminates if the amplifier enters protection mode due to overheating, low impedance, or other faults.
- GAIN (Input Sensitivity): Past de amplifier's input sensitivity to match the output voltage of your head unit. Start with the gain at minimum and slowly increase until desired volume is achieved without distortion. Range: 0.25V to 5V.
- LPF (Low Pass Filter): This control sets the upper frequency limit for the amplifier's output. Only frequencies below the set point will pass through. Typically set between 50Hz and 200Hz for subwoofers.
- SUB SONIC (Subsonic Filter): Filters out extremely low frequencies that are inaudible and can damage subwoofers. Typically set below the port tuning frequency of a ported enclosure, or around 20-30Hz for sealed enclosures. Range: 17Hz to 50Hz.
- BASS BOOST: Increases the output level at a specific bass frequency. Use sparingly to avoid distortion. Range: 0dB to 12dB.
- BASS FREQ (Bass Boost Frequency): Selects the center frequency for the bass boost control.
- FAZE: Adjusts the phase of the subwoofer output relative to the main speakers. This helps to ensure all sound waves arrive at the listener's ears in sync, improving bass impact and clarity. Adjustable from 0° to 180°.
5. Underhâld
The Zapco ST-1000XM III ampLifier fereasket minimaal ûnderhâld. Folgje dizze rjochtlinen om in lange libbensdoer te garandearjen:
- Hâld de ampskjin en frij fan stof en pún. Brûk in sêfte, droege doek foar it skjinmeitsjen.
- Soargje foar adekwate fentilaasje om 'e amplifier at all times. Do not block cooling fins.
- Kontrolearje periodyk alle bedradingferbiningen op strakheid en korrosje.
- Mije bleatstelling fan de amplifier oan ekstreme temperatueren of focht.
6. Probleemoplossing
As jo ûnderfine problemen mei dyn amplifier, rieplachtsje de folgjende hantlieding foar probleemoplossing foardat jo kontakt opnimme mei stipe.
- Gjin macht:
- Kontrolearje de ynboude sekering tichtby de batterij en de zekeringen op 'e amplibbener.
- Verify all power, ground, and remote turn-on connections are secure and have proper voltage.
- Ensure the head unit is on and sending a remote signal.
- Gjin lûd:
- Check RCA input cables for proper connection and damage.
- Verify speaker wires are correctly connected and not shorted.
- Pas de GAIN-kontrôle oan.
- Check head unit settings (e.g., subwoofer output enabled, volume up).
- Ferfoarme lûd:
- Ferleegje de GAIN-ynstelling.
- Check speaker impedance; ensure it is within the amplifier's rated limits.
- Adjust LPF, Subsonic, and Bass Boost settings.
- Ensure speaker wires are not shorted or damaged.
- Amplifier Goes into Protection Mode (PRT LED on):
- Check for speaker wire shorts or impedance too low.
- Soargje foar genôch fentilaasje om oververhitting te foarkommen.
- Check for proper power and ground connections.
7. Spesifikaasjes
| Eigenskip | Spesifikaasje |
|---|---|
| Amplibbener Type | Single channel, Class D, Bass Amplibbener |
| Power @ 1Ω | 1 x 1050 watt RMS |
| Power @ 2Ω | 1 x 750 watt RMS |
| Power @ 4Ω | 1 x 450 watt RMS |
| THD @ Rated Power | <0.2% |
| Sinjaal nei Noise Ratio | >100dB |
| THD + lûd | <0.1% |
| Effisjinsje | > 85% |
| Frequency Response | 10Hz to 200Hz ±1dB |
| Ynput gefoelichheid | 0.25V oant 5V |
| Ofmjittings (B x H x L) | 160mm x 58mm x 300mm (Chassis) |
| Overall Dimensions (W x H x L) | 160 mm x 58 mm x 325 mm |
| Item Gewicht | 8 pûn sterling |
| Mounting Type | Surface Mount |
| Spesifikaasje Met | FCC |
8. Garânsje en stipe
The Zapco ST-1000XM III amplifier komt mei in 1-Arige garânsje from the date of purchase, covering defects in materials and workmanship under normal use. This warranty does not cover damage caused by improper installation, accident, misuse, abuse, neglect, or unauthorized modification.
For technical support or warranty claims, please contact your authorized Zapco dealer or visit the official Zapco website for contact information. Please have your product model number and proof of purchase ready.