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General| Type | Component |
|---|---|
| Tweeter Size | 1 inch |
| Size | 6.5 inches |
| Impedance | 4 ohm |
| Woofer Size | 6.5 inches |
Details warranty coverage and requirements for amplifier returns and service.
Provides contact information for technical help, including phone, email, and website.
Read the manual, gather tools/materials, and disconnect the battery before starting.
Select a location with good air circulation, avoiding inverted mounting for heat dissipation.
Lists essential tools, speaker wire, mounting hardware, and amplifier installation kit components.
Diagrams and guidance for routing power, RCA, and speaker wires safely and effectively.
Recommends using the heaviest gauge power cable for optimal sound and future expansion.
Details connecting the +12V power terminal using appropriate gauge wire and fuse holder.
Explains establishing a clean, unpainted metal chassis ground for optimal electrical contact.
Describes connecting remote turn-on/off wires for RCA/High Level inputs and auto-start.
Specifies correct fuse types and ratings (25A for RA25, 35A x2 for RA30).
Explains the function of the green power light and red protect light indicators.
Explains connecting low-level RCA inputs and high-level speaker outputs for optimal sound.
Details using shielded RCA cables, correct length, and avoiding interference.
Describes connecting speaker wires for high-level input, emphasizing polarity and phase.
Explains using the switch to select between high and low level inputs for best performance.
Describes using auto-start with high-level input or a separate remote wire.
Guide to adjusting input level controls to match radio output for optimal sound.
Explains using the Grand Bass feature for boosting bass volume at 40 Hz.
Details adjusting the phase control for optimal bass soundstage and imaging.
Explains the HPF's role in blocking low frequencies or acting as a subsonic filter.
Describes the LPF's use for subwoofers, allowing low frequencies and blocking higher ones.
Illustrates stereo wiring for two full-range speakers to the RA25 amplifier.
Shows how to connect a single speaker in bridge mode for mono output, with impedance notes.
Explains how to use the HP-filter setting for full-range playback or to limit low bass.
Illustrates connecting front speakers and a subwoofer to the RA30's channels.
Details LP-filter and Grand Bass settings for the RA30's subwoofer channels.
Explains HP-filter settings for the RA30's front channels to control frequency response.
Describes the remote control unit for adjusting bass level and phase from the front seat.
Instruction to reconnect the negative battery terminal after all wiring is complete.
Steps to verify power and remote turn-on connections by checking the amplifier's power light.
Procedures to check speaker wiring and ensure all speakers are operating correctly.
Steps to diagnose issues when the amplifier shows no signs of power or operation.
Diagnosing why amplifier protection fuses blow, often due to shorted speaker cables.
Addressing amplifier shutdown due to overheating from inadequate ventilation or impedance.
Steps to diagnose issues when one or more speakers are not producing sound.
Steps to eliminate engine-related whining noise by checking power/ground and capacitor.
Methods to resolve constant noise by checking grounding and rerouting signal cables.
Ensuring speakers are wired in phase for optimal bass and stereo imaging.
Bundling wires securely and keeping power wires separate from signal/speaker wires.
Guidance on properly preparing wires and using crimp connectors for secure connections.
Detailed technical specifications for RA25 and RA30 amplifiers including power output and dimensions.
Information on idle and maximum power consumption, and required fuse sizes.
Specifies maximum recommended cable sizes for DC input, speakers, and subwoofer outputs.
Notes on amplifier stability at different impedances, including 2-ohm stereo and 4-ohm bridged loads.
