Parasound
Parasound Halo A23+ Stereo Amplifier
Best stereo amplifier for audiophiles seeking refined, high-power sound performance.
The Parasound Halo A23+ is a compact, powerful two-channel stereo amplifier designed by legendary engineer John Curl. It delivers 160 watts per channel into 8-ohm speakers or 240 watts into 4-ohm speakers, with the ability to bridge into a 500-watt mono mode. This upgraded successor to the popular A23 features a 25-30% increase in power, an improved power supply, and enhanced internal components. Its high-bias Class A/AB design ensures pure, natural sound at normal listening levels, transitioning to Class AB for higher power demands. The direct-coupled signal path and discrete JFET input transistors contribute to its clean, detailed audio reproduction. It offers both balanced XLR and unbalanced RCA inputs, heavy-duty speaker binding posts, and convenient features like 12V trigger and audio-sensing auto-on.
$2500.00
More Halo Options
Owner Satisfaction
4.7
/ 5
Category Rank
56
/ 560
#56 in Audio & Video Receivers
Price vs Category Average
-5%
Below average
Power Output
16082404
/ watts per channel into ohms, watts per channel into ohms
Who it's for
- Audiophiles driving demanding speakers needing consistent, high-impact power
- Listeners seeking transparent, musical sound with expansive imaging
- System builders requiring versatile connectivity for complex audio setups
Who should skip it
- Minimalists wanting an all-in-one solution without extra components
- Users with limited shelf space or constrained equipment racks
- Owners with enclosed cabinets lacking adequate airflow for cooling
Performance breakdown
Power Delivery
Substantial current reserves handle demanding speaker loads with effortless dynamic authority.
Sonic Transparency
John Curl’s circuit design preserves delicate musical textures with remarkable clarity.
Build Integrity
Heavy-duty components and a robust chassis reflect professional-grade manufacturing standards.
Operational Versatility
Bridging capabilities and flexible input options suit diverse high-end audio setups.
Thermal Efficiency
High-bias design balances pure Class A warmth with efficient power management.
Installation Convenience
Compact 2U form factor fits easily into most standard equipment racks.
Key Specs
Power Output
160 watts per channel into 8 ohms, 240 watts per channel into 4 ohms
Bridged Mono Power
500 watts
Amplifier Class
High-bias Class A/AB
Input Stage
Discrete JFET transistors
Output Transistors
12 bipolar transistors per channel
Peak Current
45 amps
Power Supply
1.1 kVA shielded toroidal transformer
Filter Capacitance
54,400 µF
Features
- Co-designed by legendary audio circuit designer John Curl
- High-bias Class A/AB operation for pure, natural sound
- Direct-coupled signal path for uncolored audio
- High current capability to drive demanding speakers
- Robust power supply for dynamic impact
- Compact, rack-mountable 2U chassis
- Versatile stereo or bridged mono operation
- Balanced and unbalanced input options
What customers say
Customers consistently praise the Parasound Halo A23+ Stereo Amplifier for its exceptional quality and remarkable value. Reviewers frequently highlight the amplifier's robust build and its ability to deliver a clean, powerful, and detailed audio experience. Many users consider it a significant upgrade, noting its reliable performance and elegant design. The consensus points to a product that offers premium sound and construction without an exorbitant price tag, making it a highly regarded choice for discerning audiophiles seeking both performance and affordability.
Know before you buy
The A23+ is a significant upgrade, featuring a 25-30% increase in power output and a redesigned, more robust power supply. It also incorporates enhanced internal components to improve overall sonic clarity and dynamic impact compared to its predecessor.
Yes, the A23+ is designed to be highly stable and capable of driving demanding speakers with impedance as low as 2 ohms. Its high-current design and 1.1 kVA toroidal transformer ensure it maintains control even when speaker loads become difficult.
This design allows the amplifier to operate in pure Class A at lower power levels, which provides a smoother, more natural sound. As your music demands more power, it seamlessly transitions to Class AB to maintain efficiency and headroom.
Yes, the A23+ can be bridged into a single-channel mono mode, delivering 500 watts of power. This is an excellent option if you want to use two A23+ units to power a pair of high-performance speakers with dedicated amplification for each.
Yes, it includes a 12V trigger input and output for automated power control, as well as an audio-sensing auto-on feature. These allow the amplifier to wake up automatically when it detects a signal or receives a command from your preamplifier or controller.
Yes, the A23+ features a compact 2U rack-mountable chassis, making it easy to integrate into professional or home audio racks. It is designed to be space-efficient without sacrificing the internal build quality required for high-end performance.
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$2500