The Jensen PowerPlus Amplifiers are a series of high-power audio amplifiers designed for use in vehicles with a 12-Volt negative ground electrical system. These amplifiers are engineered to meet or exceed CEA-2006 test standards, ensuring accurate sound reproduction with deep bass, low harmonic distortion, and plenty of reserve power. The series includes models 420, 840, 900, 1150, 1302, and 1304, each offering varying power outputs and configurations to suit different audio system needs.
Function Description:
The PowerPlus Amplifiers are designed to enhance in-car audio systems by providing robust power to speakers and subwoofers. They feature built-in low-pass and high-pass crossover filters for bi-amplifying the system, allowing users to tailor the audio output to their specific speaker setup. The amplifiers can be configured for stereo, mono, or bridged modes, offering flexibility for various speaker arrangements. Key controls include an Input Level (GAIN) control to match the amplifier's input to the receiver's output, and a Bass EQ for continuous adjustment of bass boost from 0 to +12dB at 45Hz. This allows for equalization of different subwoofer/enclosure combinations, with recommendations for ported/bandpass enclosures (limited to +6dB to +9dB) and sealed enclosures (up to +12dB). The Low Pass Filter (LPF) and High Pass Filter (HPF) controls adjust the crossover points, typically between 60Hz and 80Hz for ported and sealed enclosures, and higher for bandpass boxes (125Hz-150Hz). The HPF can also be used as an infra-sonic filter or to limit low frequencies to smaller speakers.
Important Technical Specifications:
The PowerPlus series amplifiers are designed to drive speakers with a nominal impedance range of 2-4 ohms, with 2-ohm loads recommended for maximum power. A minimum of 12-gauge speaker wire is required for optimal performance.
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PowerPlus 420:
- Load Impedance: 2-4 ohm
- Low Pass Filter: 40-240Hz
- High Pass Filter: 40-400Hz
- RMS Power Output: 75 x 2 Watts (4-ohm), 110 x 2 Watts (2-ohm), 210 x 1 Watts Bridged (4-ohm)
- Signal to Noise Ratio: >100dB (rated power)
- Frequency Response: 5-60 kHz, -3dB
- THD+N @ 5 watts: 0.02%
- Dimensions: L10.5" x H2.5" x W11.75"
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PowerPlus 840:
- Load Impedance: 2-4 ohm
- Low Pass Filter: 40-240Hz
- High Pass Filter: 40-400Hz
- RMS Power Output: 75 x 4 Watts (4-ohm), 110 x 4 Watts (2-ohm), 210 x 2 Watts Bridged Stereo (4-ohm)
- Signal to Noise Ratio: >100dB (rated power)
- Frequency Response: 5-60 kHz, -3dB
- THD+N @ 5 watts: 0.02%
- Dimensions: L14" x H2.5" x W11.75"
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PowerPlus 900:
- Load Impedance: 2-4 ohm
- Low Pass Filter: 40-250Hz
- Subsonic Filter: 10-40Hz, 12dB/octave
- RMS Power Output: 275 x 1 Watts (4-ohm), 450 x 1 Watts (2-ohm)
- Signal to Noise Ratio: >100dB (rated power)
- Frequency Response: 5-60 kHz, -3dB
- THD+N @ 5 watts: 0.02%
- Dimensions: L17.25" x H2.5" x W11.75"
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PowerPlus 1150:
- Load Impedance: 2-4 ohm
- Low Pass Filter: 40-250Hz
- Subsonic Filter: 10-40Hz, 12dB/octave
- RMS Power Output: 350 x 1 Watts (4-ohm), 575 x 1 Watts (2-ohm)
- Signal to Noise Ratio: >100dB (rated power)
- Frequency Response: 5-60 kHz, -3dB
- THD+N @ 5 watts: 0.02%
- Dimensions: L19" x H2.5" x W11.75"
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PowerPlus 1302:
- Load Impedance: 2-4 ohm
- Low Pass Filter: 50-250Hz
- High Pass Filter: 40-500Hz
- RMS Power Output: 195 x 2 Watts (4-ohm), 320 x 2 Watts (2-ohm), 650 x 1 Watts Bridged (4-ohm)
- Signal to Noise Ratio: >100dB (rated power)
- Frequency Response: 5-60 kHz, -3dB
- THD+N @ 5 watts: 0.02%
- Dimensions: L15.5" x H2.5" x W11.75"
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PowerPlus 1304:
- Load Impedance: 2-4 ohm
- Low Pass Filter: 40-240Hz
- High Pass Filter: 40-400Hz
- RMS Power Output: 125 x 4 Watts (4-ohm), 160 x 4 Watts (2-ohm), 325 x 2 Watts Bridged Stereo (4-ohm)
- Signal to Noise Ratio: >100dB (rated power)
- Frequency Response: 5-60 kHz, -3dB
- THD+N @ 5 watts: 0.02%
- Dimensions: L15.5" x H2.5" x W11.75"
All models feature a low-profile aluminum extruded heat sink, pass-thru RCAs, encapsulated power and speaker connectors, and protection circuitry for short circuit, DC-offset, and thermal overload. Diagnostic LEDs (Green for Power, Red for Standby/Fault) and blue illuminated VU level meters are also included.
Usage Features:
- Installation Flexibility: The compact design allows for mounting in various locations such as under seats or in the trunk. Proper air circulation is crucial due to heat generation.
- Wiring Options: Detailed diagrams are provided for connecting one or two speakers in different configurations (stereo, mono, bridged) while observing correct speaker polarity and impedance.
- Input Modes: Models like the 420 and 1302 offer ST/MO (stereo/mono) mode switches, while the 840 and 1304 feature a 4/3/2 MODE switch for 2, 3, or 4 channel input configurations.
- Remote Input Level Control: PowerPlus 900, 1150, and 1302 models include a remote input level control that can be mounted under-dash or in-dash. This allows for convenient adjustment of bass levels independently from the main system, useful for system tuning or when playing various music types.
- Connecting Additional Amplifiers: Pass-Thru RCA connectors are provided, eliminating the need for "Y" adapters when connecting multiple amplifiers.
Maintenance Features:
- Troubleshooting Guide: The manual includes a comprehensive troubleshooting section to address common issues such as the amplifier not turning on, distorted sound, blown fuses, engine noise/alternator whine, thermal protection activation, and poor bass response. This guide helps users identify possible causes and corrective actions.
- Protection Circuitry: Built-in short circuit, DC-offset, and thermal overload protection circuitry safeguard the amplifier from damage. If the protection light activates, the troubleshooting guide advises checking speaker connections and power connections.
- Fuse Replacement: Specific fuse requirements (type and quantity) are listed for each model, ensuring proper replacement and protection against electrical fires.
- Grounding Recommendations: Emphasizes the importance of a short, secure ground connection to bare metal chassis, using a ring terminal and an "outside star washer" for optimal contact.
- Power Wiring Guidelines: Provides recommended wire gauges based on maximum current draw for each amplifier model, along with instructions for connecting the main power wire to the battery with an adequate fuse or circuit breaker.
- Battery Disconnection: Advises disconnecting the negative battery cable before installation to prevent electrical hazards.
The Jensen PowerPlus Amplifiers are designed for enthusiasts seeking high-quality, powerful, and reliable audio amplification in their vehicles, with features that cater to both performance and ease of use.
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