1. Introduction
This manual provides comprehensive instructions for the Alpine S2-A120M S-Series Class-D Mono Subwoofer Amplifier and the Alpine RUX-KNOB.2 Remote Bass Knob. It covers essential information regarding product features, proper setup, operational guidelines, maintenance procedures, troubleshooting common issues, and detailed technical specifications. Please read this manual thoroughly before installation and operation to ensure correct usage and optimal performance.
2. Produit terminéview
2.1. Principales caractéristiques
- S2-A120M Amplifier : Class-D Mono Subwoofer Amplifier with 1200W RMS power output at 1 or 2 Ohms.
- Features Alpine's Class D Amplifier Circuitry.
- Designed with a two-sided terminal layout for efficient wiring.
- Includes built-in selectable and adjustable crossovers.
- Compatible with optional remote bass knobs (RUX-KNOB.2 or RUX-H01).
- RUX-KNOB.2 Remote Bass Knob: Allows for convenient adjustment of amplifier bass gain from within the vehicle cabin.
- Prend en charge plusieurs amplifier control with telephone cord adapters.
2.2. Composants
The product bundle includes the Alpine S2-A120M Mono Subwoofer Amplifier and the Alpine RUX-KNOB.2 Remote Bass Knob.

Figure 1 : Caisson de basses mono Alpine S2-A120M série S Amplifier and RUX-KNOB.2 Remote Bass Knob. This image displays the amplifier unit and the separate remote bass knob.

Figure 2 : Haut view of the Alpine S2-A120M Amplifier. The top panel features the Alpine logo and a central indicator light.

Figure 3 : Gros plan view of the Alpine RUX-KNOB.2 Remote Bass Knob. This image highlights the control knob and its mounting bracket.
3. Configuration et installation
Une installation correcte est essentielle à la performance et à la longévité de votre appareil. ampAmplificateur. Il est recommandé que l'installation soit effectuée par un professionnel qualifié.
3.1. AmpPlacement lificateur
- Choose a location that is dry, well-ventilated, and protected from direct sunlight or excessive heat.
- Veillez à laisser suffisamment d'espace autour de l'objet. amplificateur pour une bonne dissipation de la chaleur.
- Montez le ampL'amplificateur est solidement fixé pour empêcher tout mouvement pendant le fonctionnement du véhicule.
3.2. Connexions de câblage
The S2-A120M amplifier features a two-sided terminal layout for organized wiring.

Figure 4 : Rear panel connections of the Alpine S2-A120M Amplifier. Cette view shows the power supply terminals (BATT, REM, GND) and speaker output terminals (SPK OUT).
- Connexion électrique : Connect the main power cable from the vehicle battery to the BATT terminal. Ensure an appropriate fuse is installed close to the battery.
- Connexion au sol : Raccordez un câble de terre court et de forte section à partir du Terre terminal to a clean, unpainted metal surface on the vehicle chassis.
- Allumage à distance : Connect a remote turn-on wire from your head unit to the REM terminal. This wire signals the ampAmplificateur à allumer et à éteindre avec votre système audio.
- Entrée audio : Connectez les câbles RCA de la sortie subwoofer de votre autoradio à amplifier's input jacks (not explicitly shown in the provided image, but standard for amplificateurs).
- Sortie haut-parleur : Connectez votre ou vos caissons de basses au SORTIE SPK terminals. Observe correct polarity (+ to + and - to -).
3.3. RUX-KNOB.2 Installation
The RUX-KNOB.2 remote bass knob connects to the amplifier via a telephone cord adapter. Install the knob in a convenient location within the vehicle cabin for easy access.
- Mount the RUX-KNOB.2 using the provided bracket and screws.
- Connect the telephone cord from the RUX-KNOB.2 to the designated remote bass knob port on the S2-A120M amplifier.
4. Mode d'emploi
4.1. Mise sous tension initiale
- After all connections are made, turn on your vehicle's ignition and audio system.
- Le ampLe voyant d'alimentation de l'amplificateur devrait s'allumer.
4.2. Ajustement des gains
Le contrôle de gain sur le ampL'amplificateur correspond au volume de sortietage de votre autoradio à amplifier's input. Set the gain carefully to avoid distortion.
- Commencez par le amplifier gain set to minimum.
- Play a familiar music track with strong bass content.
- Slowly increase the head unit volume until it reaches about 75-80% of its maximum.
- Augmenter progressivement la amplifier gain until you hear slight distortion, then back off slightly.
4.3. Paramètres du crossover
The S2-A120M features built-in selectable and adjustable crossovers to filter frequencies sent to your subwoofer.
- Adjust the low-pass filter (LPF) to send only low frequencies to the subwoofer. A common starting point is 80-100 Hz.
- Refer to your subwoofer's specifications for recommended crossover points.
4.4. Using the RUX-KNOB.2 Remote Bass Knob
The RUX-KNOB.2 allows for real-time adjustment of the subwoofer's bass level from the driver's seat.
- Rotate the knob clockwise to increase bass output.
- Rotate the knob counter-clockwise to decrease bass output.
- This knob provides fine-tuning of the bass level without needing to access the amplifier directement.
5. Entretien
Regular maintenance helps ensure the longevity and optimal performance of your Alpine amplifier and bass knob.
- Nettoyage: Essuyez périodiquement le amplifier and bass knob with a soft, dry cloth to remove dust and debris. Avoid using harsh chemicals or abrasive cleaners.
- Vérification de la connexion : Annually, inspect all wiring connections (power, ground, remote, RCA, speaker) to ensure they are secure and free from corrosion. Loose connections can lead to performance issues or damage.
- Ventilation: Assurez-vous que le ampLes ailettes de refroidissement de l'amplificateur ne sont pas obstruées afin de permettre une dissipation thermique adéquate.
6. Dépannage
If you encounter issues with your Alpine amplifier, refer to the following troubleshooting guide before seeking professional assistance.
| Problème | Cause possible | Solution |
|---|---|---|
| Pas de courant / AmpL'amplificateur ne s'allume pas |
|
|
| Pas de sortie audio |
|
|
| Son déformé |
|
|
| RUX-KNOB.2 Not Functioning |
|
|
7. Spécifications
7.1. Alpine S2-A120M Amplifier
- Power Output (14.4V, <0.1% THD+N):
- 600 W x 1 à 4 Ω
- 1200 W x 1 à 2 Ω
- 1200 W x 1 à 1 Ω
- Rapport signal/bruit (rapport S/B) : >85 dB
- Réponse en fréquence : 20 Hz – 400 Hz
- DampFacteur d'ingé : >750
- Dimensions (L x H x P) : 13.1 "x 2.25" x 8.25 "(33.27 cm x 5.72 cm x 20.96 cm)
- Poids: Approximately 8 lbs, 11 oz (3.94 kg)
7.2. Alpine RUX-KNOB.2 Remote Bass Knob
- Fonction: Remote bass gain adjustment for compatible Alpine amplificateurs.
- Compatibilité: Designed for use with S2-A120M and other compatible Alpine amplifiers (e.g., MRX-M50, MRX-M100, MRX-V60, PDX-M12, PDX-M6).
- Connexion: Via telephone cord adapter.
8. Garantie et assistance
For warranty information and technical support, please refer to the official Alpine website or contact Alpine customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.
Alpine Customer Support: Visit Alpine's Support Page





