EFX PA4BX - Uncategorized Scosche - Free user manual and instructions
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| Product Type | 4-Channel Car Audio Amplifier |
| Model | EFX PA4BX |
| Brand | Scosche |
| RMS Power Output | 75W x 4 @ 4 ohms; 150W x 4 @ 2 ohms |
| Max Power Output | 600W (peak) |
| Frequency Response | 20 Hz - 20 kHz |
| Total Harmonic Distortion | < 0.05% |
| Signal-to-Noise Ratio | > 90 dB |
| Crossover | Variable high-pass/low-pass (40 Hz - 400 Hz) |
| Bass Boost | Variable 0-12 dB @ 45 Hz |
| Input Sensitivity | 200 mV - 6 V |
| Inputs | 2x RCA stereo inputs (front/rear) |
| Speaker Outputs | 4x screw terminals |
| Power Supply | 12V DC (negative ground) |
| Fuse Rating | 30A x 1 |
| Dimensions (W x D x H) | 7.5 x 11.0 x 2.1 inches (190 x 280 x 53 mm) |
| Weight | 3.2 lbs (1.5 kg) |
| Protection Circuits | Thermal, short circuit, overload |
| Cooling | Aluminum heatsink with fan |
| Installation | Remote turn-on wire required; 4 AWG power/ground recommended |
| Cleaning | Wipe with dry, lint-free cloth; avoid moisture |
| Safety Certification | CE, RoHS compliant |
Frequently Asked Questions - EFX PA4BX Scosche
What is the power output of the Scosche EFX PA4BX amplifier?
The amplifier delivers 75 watts RMS per channel at 4 ohms and 150 watts RMS per channel at 2 ohms, with a peak power of 600 watts.
What is the recommended power wire gauge?
For optimal performance, use 4 AWG power and ground cables. Ensure the main fuse is within 18 inches of the battery.
How do I adjust the gain on the EFX PA4BX?
Turn the gain dial on the amplifier while playing a test tone. Set it to match your head unit's preamp voltage (typically 2-4V) to avoid distortion.
Can I bridge the amplifier channels?
Yes, you can bridge channels 1+2 and 3+4 to get 300W RMS per bridged output at 4 ohms. Minimum impedance for bridged mode is 4 ohms.
What type of crossover does the EFX PA4BX have?
It features a variable high-pass and low-pass crossover adjustable from 40 Hz to 400 Hz, plus a bass boost of 0-12 dB at 45 Hz.
Does the amplifier have any protection features?
Yes, it includes thermal, short circuit, and overload protection. The amplifier will shut down automatically if conditions exceed safe limits.
What is the input sensitivity range?
The input sensitivity is 200 mV to 6 V, compatible with most factory and aftermarket head units.
Is a remote turn-on wire required?
Yes, connect the REM terminal to a 12V switched power source from your head unit or a dedicated switch to turn the amplifier on/off with the ignition.
How do I troubleshoot no sound from the amplifier?
Check power and ground connections, ensure the remote wire has 12V, verify the head unit is outputting signal, and inspect the fuse (30A). If the protection LED is on, there may be a short or impedance mismatch.
Can the EFX PA4BX be used with a subwoofer?
Yes, you can bridge two channels to power a subwoofer, or use the low-pass crossover feature on the dedicated subwoofer outputs if available. Set the crossover to 80-120 Hz for subs.
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USER MANUAL EFX PA4BX Scosche
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Product information
Brand : Scosche
Model : EFX PA4BX
Category : Uncategorized