1. Introduktion
Thank you for choosing the Zapco ST-2B 2-Channel 180-Watt Class AB Amplifier. Det her amplifier is designed to deliver high-quality audio performance for your car audio system. Please read this manual thoroughly before installation and operation to ensure proper use and to maximize the performance and longevity of your amplivligere.
2. Sikkerhedsoplysninger
Vigtige sikkerhedsinstruktioner:
- Frakobl altid bilens negative batteripol, inden du påbegynder nogen form for installation.
- Sørg for, at alle ledninger er korrekt ført og fastgjort for at forhindre skader eller kortslutninger.
- Brug passende ledningsføring til strøm- og jordforbindelser som angivet i denne manual.
- Installer ampOpbevaringsenheden på et sted, der giver tilstrækkelig ventilation for at forhindre overophedning.
- Undgå at installere ampløfteren i områder, der er udsat for fugt eller kraftige vibrationer.
- Hvis du er usikker på nogen del af installationsprocessen, skal du kontakte en professionel installatør af bilstereo.
3. Hvad er der i æsken
Upon unpacking your Zapco ST-2B amplifier, please verify that all items are present:
- Zapco ST-2B 2-Channel Class AB Amplivligere
- Instruktionsbog
- Monteringsskruer
- Wiring Harness (for speaker level input, if applicable)

4. Produktet er slutview
The Zapco ST-2B is a 2-channel Class AB full-range amplifier designed for versatility and sound quality. It features a robust MOSFET power supply and flexible crossover controls.
4.1 Kontrol og tilslutninger på frontpanelet

- L-R IN (Speaker Level Input): Connects to your head unit's speaker outputs for high-level input.
- IN (RCA Input): Connects to your head unit's RCA pre-outs for low-level input.
- OUT (RCA Output): Provides a pass-through signal for connecting additional amplivførere.
- MIN MAX GAIN: Justerer indgangsfølsomheden, så den passer til udgangen på din hovedenhed.
- BASS BOOST: Provides adjustable bass enhancement (0dB, 6dB, 12dB).
- 50Hz 250Hz LPF (Low Pass Filter): Controls the upper frequency limit for subwoofer applications.
- 80Hz 3KHz HPF (High Pass Filter): Controls the lower frequency limit for full-range or component speakers.
- FILTER Switch (FULL / LPF / HPF): Selects the desired crossover mode.
- STRØM-LED: Illuminates green when the ampLifieren er tændt og fungerer normalt.
- BESKYTTELSE LED: Lyser rødt, når amplifier enters protection mode due to a fault (e.g., overheating, short circuit).
4.2 Bagpaneltilslutninger

- + 12V: Main power input from the vehicle's battery.
- REM (fjernbetjening): Tilsluttes hovedenhedens fjernbetjente tændingsudgang.
- GND (jord): Forbindes til køretøjets chassis jord.
- FUSE (20A): Integrated fuse for protection.
- SPEAKER OUTPUTS (+ LEFT - / + RIGHT - / BRIDGED): Connects to your speakers. Supports stereo or bridged mono operation.
5. Opsætning og installation
Proper installation is crucial for optimal performance and safety. If you are not comfortable performing the installation yourself, seek professional assistance.
5.1 Montering af Amplivligere
- Vælg et monteringssted, der er tørt, godt ventileret og beskyttet mod direkte sollys eller overdreven varme.
- Sørg for, at der er tilstrækkelig plads omkring amplifier til luftcirkulation.
- Brug de medfølgende monteringsskruer til at fastgøre ampfast på en fast overflade.
5.2 Ledningsforbindelser
Strømledninger:
- Frakobl den negative pol på køretøjets batteri.
- Run a power cable (minimum 8 AWG recommended) from the positive terminal of the battery to the amplifier's +12V terminal. Install an in-line fuse holder (with a fuse rated appropriately, e.g., 20A) within 18 inches (45 cm) of the battery.
- Run a ground cable (same gauge as power cable) from the ampForbind GND-terminalen på forsyningen til en ren, umalet metaloverflade på køretøjets chassis. Sørg for en god elektrisk forbindelse.
- Run a remote turn-on cable (18-22 AWG) from your head unit's remote output to the ampliferens REM-terminal.
Signal Input Wiring:
- RCA-indgang: Tilslut RCA-kabler fra din hovedenheds for-amp udgange til amplifier's IN (RCA Input) terminals.
- Højttalerniveauindgang: If your head unit does not have RCA outputs, use the provided speaker level input harness. Connect the head unit's speaker wires to the corresponding wires on the harness, then plug the harness into the L-R IN connector on the amplivligere.
Speaker Output Wiring:
- Stereo-tilstand: Connect the positive (+) and negative (-) terminals of your left speaker to the amplifier's + LEFT - terminals. Repeat for the right speaker using the + RIGHT - terminals. Ensure correct polarity.
- Bridged Mode (Mono): For higher power output to a single speaker (e.g., a subwoofer), connect the speaker's positive (+) terminal to the amplifier's + LEFT + terminal and the speaker's negative (-) terminal to the amplifier's - RIGHT - terminal. Refer to the amplifier's specifications for minimum impedance in bridged mode (typically 4 ohms).
6. Betjeningsvejledning
6.1 Første opstart og justering af forstærkning
- Når alle tilslutninger er foretaget, skal bilens negative batteripol tilsluttes igen.
- Turn on your head unit. The POWER LED on the amplifier should illuminate green.
- Indstil amplifier's GAIN control to minimum (fully counter-clockwise).
- Play a familiar piece of music at a moderate volume level on your head unit (around 75% of maximum volume).
- Øg langsomt GAIN-kontrollen på amplifier until you hear distortion, then back it off slightly until the sound is clear. This sets the gain properly to match your head unit's output.
6.2 Delefiltreindstillinger
- FULD: For full-range output, allowing all frequencies to pass through.
- LPF (lavpasfilter): Use for subwoofers. Set the FILTER switch to LPF and adjust the LPF knob (50Hz-250Hz) to cut off higher frequencies. A common starting point is 80Hz-100Hz.
- HPF (Højpasfilter): Use for full-range or component speakers to protect them from low frequencies. Set the FILTER switch to HPF and adjust the HPF knob (80Hz-3KHz) to cut off lower frequencies. A common starting point is 80Hz-100Hz.
6.3 basforstærkning
The BASS BOOST switch provides an adjustable bass enhancement. Use this feature sparingly and adjust carefully to avoid distortion or speaker damage. Start at 0dB and increase gradually if desired.
7. Vedligeholdelse
- Rensning: Brug en blød, tør klud til at rengøre ampydersiden af apparatet. Brug ikke skrappe kemikalier eller slibende rengøringsmidler.
- Ventilation: Sørg for, at ampLifierens køleribber er fri for støv og snavs for at opretholde korrekt varmeafledning.
- Forbindelser: Kontrollér regelmæssigt alle ledningsforbindelser for at sikre, at de er fastgjorte og fri for korrosion.
- Udskiftning af sikring: Hvis amplifier's fuse blows, replace it only with a fuse of the same type and rating (20A). A repeatedly blown fuse indicates a problem that needs to be addressed by a qualified technician.
8. Fejlfinding
| Problem | Mulig årsag | Løsning |
|---|---|---|
| Ingen strøm (strøm-LED slukket) |
|
|
| Beskyttelses-LED lyser (rød) |
|
|
| Ingen lyd |
|
|
| Forvrænget lyd |
|
|
9. Specifikationer
| Feature | Detalje |
|---|---|
| Model | ST-2B |
| Kanaler | 2-kanal |
| Amplivligere klasse | Klasse AB |
| Strømudgang | 180 Watts (Total, typical) |
| Stabil impedans | 4 ohms bridged or 2 ohms stereo load |
| Input type | RCA and OEM speaker level input |
| Crossover | Variable FULL / LP / HP Electronic Crossover |
| Bass Boost | Adjustable (0dB, 6dB, 12dB) |
| Strømforsyning | MOSFET |
| Produktdimensioner | 7.87 x 7.09 x 2 tommer |
| Varens vægt | 4 pund |
10. Garanti og support
Zapco products are designed for reliability and performance. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Zapco webwebsted. Behold din købskvittering som købsbevis i tilfælde af garantikrav.
For technical support or service inquiries, please contact your authorized Zapco dealer or visit the Zapco support section on their official webwebsted.