Halo A 21 vs Pass Labs X350.5
The X350.5's power @ 8ω is 350W against the Halo A 21's 300W, its power @ 4ω 700W against 500W, its thd 1.000% against 0.100%, and its weight 60 kg (132 lbs) against 32.66 kg (72 lbs).
AI-generated product photo — not official manufacturer imagery.
AmplifiersPower Amplifiers
Estimated price (community-sourced)
$2,250 - $5,000
Around — community and catalog average, updates slowly
About the Halo A 21
The Parasound Halo A 21 is a reference-grade stereo power amplifier delivering 250 watts per channel into 8Ω (400W into 4Ω) with high-bias Class A/AB operation. Designed for audiophile systems, it features direct-coupled circuitry without signal-path capacitors, balanced XLR and unbalanced RCA inputs, and robust construction with THD of 0.2% at full power. Later upgraded to the A 21+ model with 300Wpc (8Ω), 500Wpc (4Ω), and improved specifications.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 300W @ 8Ω
- Power @ 4Ω
- 500W @ 4Ω
- Minimum Impedance
- 4Ω
Analog Output
Analog signal output specifications
- THD
- 0.100%
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Analog Inputs
- XLR, RCA
Physical Dimensions
Size, weight, and appearance
- Weight
- 32.66 kg (72 lbs)
Key Specifications
Power: 300W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions