The Pioneer EQ-6000 and EQ-4000 are graphic equalizers designed to enhance the audio experience in car stereo systems. These devices allow users to finely tune the sound output, compensating for the acoustic characteristics of the vehicle's interior and the specific speakers used. The EQ-6000 offers more advanced features, including a subwoofer system, while the EQ-4000 provides core equalization capabilities.
Function Description:
Both models serve as audio processors that sit between the car stereo and the power amplifier, or directly between the stereo and speakers in some configurations. Their primary function is to provide multi-band graphic equalization, allowing users to boost or cut specific frequency ranges to achieve a desired sound profile.
The EQ-6000 is a 10-band graphic equalizer with an integrated subwoofer control system. It features:
- Graphic Equalization: Allows precise adjustment of 10 frequency bands: 40-80 Hz (Parametric), 125 Hz, 250 Hz, 500 Hz, 1 KHz, 2 kHz, 4 kHz, 8 kHz, and 16 kHz. The 40-80 Hz band is parametric, meaning both its center frequency and level can be adjusted.
- Subwoofer Control: Includes a dedicated subwoofer output with adjustable crossover frequency (50 Hz, 80 Hz, or 120 Hz), crossover slope (-12 dB/octave), output gain (∞ to +10 dB), and a phase switch (0/180°). This allows for seamless integration and optimization of a subwoofer.
- Dual Amp Balancer: Enables adjustment of the balance between front and rear speakers, useful in multi-amplifier setups.
- Illumination Color Change: Provides aesthetic customization by allowing the user to switch the illumination color between green and amber.
The EQ-4000 is a 10-band graphic equalizer, focusing on core equalization functionality. It features:
- Graphic Equalization: Offers adjustment of 10 fixed frequency bands: 60 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, and 16 kHz.
- Dual Amp Balancer: Similar to the EQ-6000, this feature allows balancing the output between front and rear speakers.
- Illumination Color Change: Also includes the ability to switch illumination color between green and amber.
Important Technical Specifications:
- Power Source: DC 14.4 V (10.8-15.6 V allowable), negative type.
- Dimensions (Chassis):
- EQ-6000: 178(W) x 25(H) x 120(D) mm [7(W) x 1(H) x 4-3/4(D) in.]
- EQ-4000: 170(W) x 24(H) x 12.5(D) mm [6-3/4(W) x 1(H) x 1/2(D) in.]
- Weight: 0.5 kg (1.1 lbs.) for both models.
- Gain: 0 dB.
- Equalization Range: ±12 dB.
- Frequency Response: 20-30,000 Hz (±3 dB).
- Distortion: 0.05% (1 kHz, 500 mV).
- Signal-to-Noise Ratio: 101 dB (IHF-A network).
- Input Impedance: 10 kΩ.
- Output Impedance: 1 kΩ.
- Max. Output Level: 2 V/1 kHz, 1% THD.
- Subwoofer (EQ-6000 only):
- Crossover Frequency: 50 Hz/80 Hz/120 Hz.
- Crossover Slope: -12 dB/octave.
- Output Gain: ∞ to +10 dB (L + R).
- Phase Switch: 0/180°.
These specifications are in accordance with standards established by the Ad Hoc Committee of Car Stereo manufacturers. Note that specifications and design are subject to modification without notice due to improvements.
Usage Features:
- Equalization Switch: Activates the equalizer control function, illuminating the lever indicators.
- Parametric Frequency Control (EQ-6000 only): Allows users to select a heavy bass frequency between 40 Hz and 80 Hz for adjustment, catering to different speaker types and music genres.
- Parametric Level Control (EQ-6000 only): Adjusts the level of the heavy bass frequency chosen with the Parametric Frequency Control.
- Equalizer Control: Sliding vertical levers allow for intuitive adjustment of each frequency band.
- Crossover Frequency Switch (EQ-6000 only): Changes the upper limit of the subwoofer's low-range frequency or the lower limit of other speakers' mid-to-high range frequency. This is crucial for optimizing sound based on cabin acoustics and speaker characteristics. It should be set to "OFF" when not using a subwoofer.
- Subwoofer Level Control (EQ-6000 only): Adjusts the output level of the subwoofer speaker.
- Subwoofer Phase Switch (EQ-6000 only): Switches the phase of the subwoofer speaker (NOR/REV) to accommodate speaker position and music type. This can significantly impact bass perception.
- Illumination Color Change: A button allows switching the display illumination between green and amber.
- Dual Amp Balancer: Vertical slider to adjust the balance between front and rear speaker outputs. Moving it upwards reduces rear speaker output, and downwards reduces front speaker output.
Important Usage Notes:
- If the car stereo has a fader control, it should be set to the center position when using these equalizers.
- Changes in low-pitched sounds may not be discernible if the program source lacks components in the adjusted frequency range (e.g., 40-80 Hz or 60 Hz) or if small-diameter speakers are used.
- Similarly, changes in high-pitched sounds may not be discernible if the program source lacks components in the 16 kHz vicinity.
Maintenance Features:
The manual includes a detailed "Parts List" and "Packing Method" section, which are crucial for maintenance and service.
- Parts List: Categorizes components by mark number, description, and part number. It highlights "fast moving items" with stars (★★ for "GENERALLY MOVES FASTER THAN ★"), indicating parts that are frequently replaced. This information is vital for distributors and service centers to manage inventory and ensure timely repairs. Parts with omitted numbers are not supplied. Parts marked with a "" may have longer delivery times or be unavailable.
- Schematic Circuit Diagrams: Provided for both EQ-6000 and EQ-4000, these diagrams are essential for troubleshooting and repair, allowing technicians to understand the internal circuitry and identify faulty components.
- Connection Diagrams: Illustrate the physical layout of components on the circuit boards, aiding in component identification and replacement during service.
- Exploded View: Offers a visual breakdown of the device's assembly, showing how different parts fit together. This is invaluable for disassembly and reassembly during repairs.
- Packing Method: Details the correct way to pack the unit, ensuring safe transport for service or storage. This includes specific instructions for styrofoam inserts, screws, and other packing materials.
Overall, the Pioneer EQ-6000 and EQ-4000 are sophisticated car audio equalizers designed for audiophiles seeking precise control over their in-car sound environment, with the EQ-6000 offering advanced subwoofer management capabilities. The comprehensive manual provides all necessary information for both users and service technicians.
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