Halo A 51 - Receiver Parasound - Free user manual and instructions
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| Product Type | 5-Channel Power Amplifier |
| Brand | Parasound |
| Model | Halo A 51 |
| Dimensions (W x H x D) | 17 in x 7.5 in x 19 in (43.2 cm x 19.1 cm x 48.3 cm) |
| Weight | 70 lbs (31.8 kg) |
| Power Output (per channel) | 250 watts RMS into 8 ohms, 400 watts RMS into 4 ohms |
| Total Power Output | 1250 watts RMS (all channels driven) |
| Frequency Response | 20 Hz - 20 kHz ±0.1 dB |
| Inputs | 5 balanced XLR, 5 unbalanced RCA |
| Outputs | 5 pairs of binding posts |
| Power Consumption | 1800 watts maximum |
| Idle Power Consumption | 150 watts |
| Gain | 29 dB (balanced), 25 dB (unbalanced) |
| Input Impedance | 100 k ohms (balanced), 50 k ohms (unbalanced) |
| S/N Ratio | 120 dB (IHF A-weighted) |
| Protection Circuits | DC offset, overcurrent, thermal, and muting |
| Power Supply | Linear with toroidal transformer |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Storage Temperature | -20°C to 60°C (-4°F to 140°F) |
| Humidity | 20% to 80% non-condensing |
| Cooling System | Variable speed fan |
| Warranty | 5 years parts and labor |
| Safety Certifications | CE, FCC, UL |
| Care Instructions | Clean with dry cloth; avoid moisture |
Frequently Asked Questions - Halo A 51 Parasound
What is the Parasound Halo A 51?
The Parasound Halo A 51 is a high-performance 5-channel power amplifier designed for home theater and audiophile systems. It delivers 250 watts per channel into 8 ohms and features balanced and unbalanced inputs.
How do I connect speakers to the Halo A 51?
Use high-quality speaker cables with bare wire or banana plugs. Connect each speaker to the corresponding channel output binding posts (Left, Center, Right, Surround Left, Surround Right). Ensure proper polarity (+ to +, - to -).
What type of input cables should I use?
For best performance, use balanced XLR cables if your preamplifier has XLR outputs. For unbalanced connections, use high-quality RCA cables. Keep cable runs as short as possible.
Can I bridge channels on the Halo A 51?
No, the Halo A 51 is not designed for bridging. Each channel operates independently. For higher power, consider using a single channel per speaker.
What is the recommended load impedance?
The amplifier is stable into loads as low as 4 ohms. For 2 ohm loads, consult the manual; continuous operation below 4 ohms may trigger protection.
How do I set the gain (input sensitivity)?
The gain is fixed at 29 dB for balanced inputs and 25 dB for unbalanced. No user adjustment is required. Match the preamplifier output level to avoid clipping.
What should I do if the amplifier shuts down or overheats?
Check for blocked ventilation or excessive ambient temperature. Ensure adequate airflow around the amplifier. The Halo A 51 has thermal protection; it will automatically restart once cooled.
How do I clean the Halo A 51?
Use a soft, dry cloth to wipe the chassis. Do not use any liquids, abrasive cleaners, or solvents. Keep the ventilation grilles free of dust.
Does the Halo A 51 have a standby mode?
Yes, the amplifier can be switched to standby using the front panel button or a 12V trigger input. In standby, power consumption is less than 1 watt.
What is the power consumption in standby?
Standby power consumption is less than 1 watt. When idle (no signal), it consumes about 150 watts. Maximum consumption under full power is 1800 watts.
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USER MANUAL Halo A 51 Parasound
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Product information
Brand : Parasound
Model : Halo A 51
Category : Receiver