FX-750.4 - Receiver Ashly - Free user manual and instructions
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| Product Type | Professional Multi-Channel Receiver |
| Brand | Ashly |
| Model | FX-750.4 |
| Number of Channels | 4 |
| Power Output (per channel) | 750W at 4 ohms |
| Frequency Response | 20 Hz - 20 kHz ±0.5 dB |
| Total Harmonic Distortion | <0.05% |
| Input Impedance | 10 kΩ (balanced), 20 kΩ (unbalanced) |
| Dimensions (W x H x D) | 19 x 3.5 x 12 inches (rackmount, 2U) |
| Weight | 18 lbs (8.2 kg) |
| Power Supply | AC 100-240V, 50-60 Hz |
| Power Consumption | 1200W max |
| Cooling System | Variable speed fans, front-to-rear airflow |
| Protection Circuits | Short circuit, thermal overload, DC offset, under-voltage |
| Input Connectors | 4x XLR balanced / 4x 1/4" TRS balanced/unbalanced |
| Output Connectors | 4x Speakon NL4 (or binding posts) |
| Front Panel Controls | Volume/attenuation per channel, power switch, LED indicators |
| Rear Panel Features | Link/parallel input, ground lift switch, fan speed setting |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Certifications | CE, RoHS, FCC |
Frequently Asked Questions - FX-750.4 Ashly
How do I connect speakers to the Ashly FX-750.4?
Use Speakon NL4 or binding post connectors on the rear panel. Ensure the speakers are rated for the amplifier's power output (750W at 4 ohms). Connect positive to positive and negative to negative, and set the amplifier to the correct impedance mode.
What is the recommended input signal level for the FX-750.4?
The input sensitivity is typically 1.23V for full output (at 4 ohms). Use balanced XLR or TRS connections for best noise rejection. Adjust the input attenuation knobs to match your source.
Why does the FX-750.4 go into protection mode?
Protection mode can be triggered by short circuits, overheating, DC offset, or low voltage. Check speaker wiring for shorts, ensure proper ventilation, and verify the AC power supply is stable (100-240V). Let the unit cool for 15 minutes before resetting.
Can I bridge the FX-750.4 channels for more power?
Yes, each pair of channels can be bridged (via rear switch or input routing). In bridge mode, the output is 1500W at 8 ohms. Use the positive terminal of channel 1 and negative terminal of channel 2, or follow the manual for specific wiring.
How do I clean and maintain the FX-750.4?
Disconnect power before cleaning. Use a dry cloth to wipe the chassis. Periodically clean the front and rear air filters (if present) with a vacuum or compressed air. Avoid using liquids or solvents.
What is the correct way to ground the FX-750.4 to avoid hum?
Use the ground lift switch on the rear panel to break ground loops. Ensure all connected equipment shares a common power ground. For balanced connections, pin 1 is ground; avoid lifting the ground on inputs unless necessary.
How can I reduce fan noise from the FX-750.4?
The amplifier has variable speed fans. Set the fan speed to 'Low' if ambient temperature is below 30°C. Keep the amplifier in a well-ventilated rack and ensure no obstructions to airflow.
What is the maximum number of FX-750.4 units I can daisy-chain?
There is no specific limit, but each unit draws up to 10A at 120V. Use a power conditioner and ensure the total current does not exceed the circuit breaker rating. Signal daisy-chaining via XLR links is possible without signal degradation for up to 10 units.
Does the FX-750.4 have built-in crossover or EQ?
No, the FX-750.4 is a pure power amplifier. It does not include DSP or crossover. Use an external crossover or DSP for frequency splitting.
What warranty does Ashly offer for the FX-750.4?
Ashly provides a 5-year limited warranty against defects in materials and workmanship. Register your product online to activate warranty. For warranty claims, contact Ashly support with your serial number.
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USER MANUAL FX-750.4 Ashly
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Product information
Brand : Ashly
Model : FX-750.4
Category : Receiver