The JBL GTO Series 601.1 is a 1-channel power amplifier designed for car audio systems, specifically for driving subwoofers. It features a Class-D voltage amplification output stage and is engineered to deliver high power levels efficiently. The amplifier is 2-Ohm stable, allowing for flexible speaker configurations.
Function Description:
The GTO 601.1 serves as a dedicated subwoofer amplifier, taking a low-level audio signal from a head unit or other source and amplifying it to drive one or more subwoofers. It incorporates a variable low-pass filter (LPF) to ensure that only bass frequencies are sent to the subwoofer, and a bass boost control to enhance low-frequency output at 50Hz. The amplifier also includes protection circuitry that safeguards against overheating, short circuits, and improper voltage conditions, indicated by an LED. For systems without RCA line outputs, the amplifier can accept speaker-level inputs. Additionally, it offers AUX outputs to pass a line-level signal to other amplifiers, facilitating multi-amplifier setups. An optional remote level control can be connected to adjust the input level from the listening position. The amplifier's design emphasizes robust power delivery and efficient operation, utilizing an advanced MOSFET oversized floating rail power supply.
Important Technical Specifications:
- Output Power (14.4V supply):
- 424W RMS x 1 channel @ 4 ohms; ≤1% THD + N
- 580W RMS x 1 channel @ 2 ohms; ≤1% THD + N
- Signal-to-noise ratio: 72dBA (reference 1W into 4 ohms)
- Dynamic power: 778W @ 2 ohms
- Effective damping factor: 6.32 @ 4 ohms
- Frequency response: 10Hz – 302Hz (-3dB)
- Maximum input signal: 5.3V
- Maximum sensitivity: 210mV
- DC Offset: <50mV (-50%)
- Output regulation: .21dB @ 4 ohms
- Idle Current: 1.3A
- Input Impedance: 22KΩ
- Max Current Draw:
- 39A @ 4 ohms
- 67A @ 2 ohms
- Dimensions (L x W x D): 15 1/8 x 12 5/16 x 2 3/8" (384mm x 313mm x 60mm)
- Fuses: 30A x 2
Usage Features:
- 1-Channel Operation: Optimized for single-channel (mono) applications, ideal for subwoofers.
- Variable Input Sensitivity (250mV – 6V): Allows for matching the amplifier's input to a wide range of source unit output levels.
- Variable Low-Pass Filter (LPF): Adjustable from 32Hz to 320Hz with a 12dB/octave slope, enabling precise control over the frequency range sent to the subwoofer.
- Bass Boost Control: Provides up to 12dB of bass enhancement at 50Hz, allowing users to tailor the low-frequency impact.
- Floating Ground Factory – Head - Unit Speaker - Level Input: Facilitates integration with head units that lack RCA line outputs, providing flexibility in system design.
- Gold-plated Power, Input and Output Connectors: Ensures reliable and corrosion-resistant connections for optimal signal transfer and power delivery.
- AUX Outputs: Allows for passing a line-level signal to additional amplifiers, simplifying multi-amplifier installations.
- Remote Level Control Input (Optional): Enables convenient adjustment of the amplifier's input level from the driver's seat.
- Power Indicator LED: Illuminates steadily for normal operation and blinks during protection circuit engagement or power-up, providing visual feedback on the amplifier's status.
- Multiple Woofer Connections: Equipped with two sets of (+/-) terminals to simplify connecting multiple woofers.
Maintenance Features:
- Fuse Protection: The amplifier is protected by two 30A fuses, which should only be replaced with the same type and rating to prevent damage.
- Troubleshooting Guide: The manual provides a comprehensive troubleshooting section to help diagnose common issues such as no audio, distorted audio, or protection LED activation. This includes checks for power connections, input sensitivity settings, speaker shorts, and overheating.
- Cooling System: Proper amplifier cooling is essential for optimal operation. The design requires sufficient air circulation, and the manual advises against blocking the mounting location to prevent overheating.
- Professional Installation Recommendation: JBL strongly recommends professional installation to ensure optimal performance and safety, particularly for complex wiring and mounting procedures.
- Component-Level Service Information: The service manual includes detailed schematics, PCB drawings, and parts lists (electrical, mechanical, IC/transistor pinouts) to aid qualified technicians in diagnosis and repair.
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