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Parasound Halo A23+ Stereo Amplifier - Silver

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Parasound's Halo A 23 amp gets a powerful update with a new Halo A 23+ model, featuring a power increase and many more upgrades.

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    This Halo Shines More Beautifully Than Ever

    Parasound already brings listeners heavenly sound, but its halo now shines more beautifully than ever with its brand new version of the Halo A23 two-channel power amplifier. Meet the Halo A23+ and enjoy performance upgrades for cleaner, ultra-low distortion sound, revised front panel cosmetics, and a revised rear panel layout offering enhanced features, too.

    Impressive Performance Upgrades

    The performance upgrades are impressive, beginning with a big 25% to 30% increase in output power compared to the previous model. The A23+ delivers 160 watts-per-channel at 8 ohms compared to 125 watts-per-channel for the A23, 240 watts-per-channel compared to 225 watts-per-channel at 4 ohms, and 500 watts in bridged mono mode compared to 400 watts with the A23.

    The performance of a power amplifier is highly dependent on the quality of its power supply, and Parasound went the extra mile with the A23+, which boasts a 10% to 15% larger main power transformer compared to the previous model A23. Transformer size has been increased from 1.0 to 1.1kVA, and the filter capacitance increases 20-30% from 40,000 uF for the A23 to 54,400 uF for the new A23+. You'll hear the advantages of these upgrades as the A23+ presents lower distortion at full power.

    Other performance upgrades include tweaked input circuits for improved crosstalk specs (70 dB at 20 kHz compared to 63 dB) and upgraded internal gold on gold audio connections, resulting in a cleaner signal path that's also more reliable.

    Rear Panel Layout and Features Upgrades

    The rear panel of the A23+ has been revised in terms of layout and new features. It boasts upgraded speaker terminals, using identical terminals to the HINT 6 integrated amp, a new jack/terminal layout with more space and more clear text/labels, and a master "Vacation" AC switch. The 2.5mm trigger jacks of the A23 have been replaced with 3.5mm jacks, and the audio trigger circuit has been updated for better low signal reliability.

    Revised Halo Front Panel Cosmetics

    The Halo series has always been known for its elegant aesthetics, and the look is even better than before. New front panel cosmetics include slim metal end caps replacing wider plastic end caps, an added gold metallic accent stripe along the end cap, gold feet now on black units, and an engraved metal "Parasound" badge replacing the red "P."

    Advanced John Curl-Designed Circuitry

    The circuitry of the A23 was engineered by legendary audio designer John Curl. Its direct-coupled topology uses no capacitors or inductors in the signal path for pure, uncolored sound. Balanced inputs with discrete circuits and XLR connectors yield dead quiet operation. The complementary JFET input stage and MOSFET drive stage incorporates 12 beta-matched 15 amp, 60 MHz bipolar output transistors for pristine sound. The high-bias "Class A"/"Class AB" operation blends best sound with highest efficiency performance.

    The A23's custom-made, high-current power supply is specially designed for exceptionally quiet operation along with ample power for climactic music passages. The 1.1KVA encapsulated toroidal power transformer uses independent secondary windings for each channel along with a 54,400 µF power supply filter capacitance. DC servo and relay protection circuits keep operation safe and reliable. And Parasound backs the A23+'s reliability with an impressive warranty.

    No Need for a Remote

    The front panel of the A23+ looks great even when the unit is turned off. When you switch the Halo on, LEDs display AC-present, channel, and high temperature status. Adjustable signal sensing can be set to automatically power up the A23 when it receives a signal from your preamp or other compatible component (or when it receives a 12-volt trigger command), eliminating the need for yet another wireless remote!

    'Instant Warm-up' Feature

    Like all the other amps in the Halo product series, the A23+ has Parasound's exclusive bias circuit, which permits the amplifier to sound perfect from the instant it's turned on, rather than having to wait for bias to gradually build up as the amp warms up over time. Even Halo's implementation of its automatic turn-on feature is exceptional. Special relays bypass the AC "soft start" circuitry after it's done its job for the purest AC and the purest sound.

    Product Features

    A23+ Performance Upgrades
    • Power up 25-30%
    • Filter capacitance up 20-30%
    • 10-15% Larger main power transformer
    • Upgraded internal gold on gold audio connections (cleaner signal path and more reliable)
    • Tweaked input circuits for Improved Crosstalk specs
    • Improved power supply for lower distortion at full power
    • Filter capacitance: 54,400 uF
    • Transformer size: 1.1kVA
    Revised Halo Front Panel Cosmetics
    • Slim metal end caps replace wider plastic end caps
    • Added gold metallic accent stripe along end cap
    • Engraved metal PARASOUND badge replaces the red P
    • Gold feet now on black units
    Revised Rear Panel Layout and Features
    • Upgraded speaker terminals (A23+ gets HINT 6 terminals)
    • New jack/terminal layout with more space and more clear text/labels
    • 2.5mm trigger jacks replaced with 3.5mm jacks
    • Audio trigger circuit has been updated for better low signal reliability
    • Master AC "vacation" switch on the rear panel

    Product Specs

    Power Output – Stereo Mode (0.06% THD)
    • 160 watts x 2, 8Ω both channels driven
    • 240 watts x 2, 4Ω both channels driven
    Power Output – Bridged Mode (0.06% THD)
    • 500 watts x 1, 8Ω
    • Bridged 4 Ω operation is not recommended
    Power Output – Stereo Mode (0.9% THD)
    • 210 watts x 2, 8Ω both channels driven
    • 300 watts x 2, 4Ω both channels driven
    Power Output – Bridged Mode (0.9% THD)
    • 600 watts x 1, 8Ω
    • Bridged 4 Ω operation is not recommended
    • All Power measurement are at 120 VAC, RMS continuous power, full audio band (20 Hz - 20 kHz)
    Current Capacity
    • 45 amps peak, per channel
    Slew Rate
    • > 130 volts per microsecond
    Frequency Response
    • 5Hz - 100kHz, +0/-3dB 20Hz - 20kHz, +0/-0.25dB
    Total Harmonic Distortion (THD)
    • < 0.06% at full power
    • < 0.03% at typical listening levels
    IM Distortion
    • < 0.04%
    • Unmeasurable
    Interchannel Crosstalk
    • > 85dB at 1kHz
    • > 70dB at 20kHz
    Input Impedance
    • Unbalanced: 33kΩ
    • Balanced: 66kΩ,(33kΩ per leg)
    Total Gain
    • 29dB
    Input Sensitivity for 28.28V Output into 8 Ω
    • Unbalanced: 1 V
    • Balanced: 1V per leg
    S/N Ratio
    • > 112dB, input shorted, IHF A-weighted
    • > 107dB, input shorted, unweighted
    Damping Factor
    • > 800 at 20 Hz
    Power Requirement
    • Standby: 1 Watt
    • Idle (no music playing): 75 Watts
    • Typical Listening levels: 125 Watts
    • Maximum: 800 Watts
    • Width: 17-1/4"
    • Depth: 15”-1/4”
    • Depth, with cables 17”
    • Height, with feet: 4-1/8”
    • Height, without feet: 3-1/2”, 2U
    • Weight: 27 lbs.

    Product Warranty

    Parts & Labor 5 Years 2 Years for Moving Parts, Remote Controls, Lasers, Front Panel Displays and Video Screens Parasound Warranty Information


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