Parasound Halo A 21+ Power Amplifier

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Parasound Halo A 21+ Power Amplifier

Parasound Halo A 21+ Power Amplifier


Not available online, please call to order.
210-805-9927

Parasound Halo A 21+ Power Amplifier


Not available online, please call to order.
210-805-9927

Add Recommended Accessories

Shunyata Venom HC Power Cord, 5’
$249.00 Free Shipping!
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  • Description

    MY TAKE: For more than twenty years Parasound has been a name synonymous with unmatched value. Their electronics are respected for both performance and reliability and compete with significantly more expensive products. Modestly priced, previous offerings have changed the common perception about the level of performance that can be achieved at the price point. With the introduction of the Halo line, Parasound looks to bring the same level of value and performance to a more upscale market. The ambitious Halo range spans the gamut from state of the art home theater offerings to high-end two-channel audio.

    For some years, the legendary John Curl has worked with Parasound as a consultant. His input has dramatically influenced their products and is one of the reasons for the praise they’ve received from the audiophile community. The A 21+ is an accomplished two-channel amplifier capable of the dynamic impact required for home theater applications while retaining the ability to reproduce the subtlety and nuance of music. - Galen Carol

     

    REVIEWS:

    Positive Feedback: "The A 21+ represents a new unparalleled value in amplifier performance. Details like soundstage depth, focus, and texture are where the A 21+ puts real distance from the A 21. The A 21+ is exceptional and provided an awe-striking feel."
     


    FEATURES (and comparison of A21 vs A21+):

    Changes from the original A 21→A 21+

    250 → 300 Watts (8Ω)
    400 → 500 Watts (4Ω)
    750 → 1000 Watts (bridged)
    Filter cap: 88,000 uF → 108,000 uF
    S/N: 112dB → 115 dB
    THD (at full power): 0.2% → 0.1%
    Crosstalk (20kHz): 63dB → 70dB
    Transformer size: 1.2 kVA → 1.3 kVA
    Weight: 60 LB → 71 LB
    Refined Halo cosmetic with aluminum end caps & gold highlights
    Updated rear panel with heavy duty speaker terminals from JC 5
    Upgraded internal gold on gold audio connections
    Updated auto turn-on circuit


    FEATURES:

    300 watts x 2 @ 8 Ω RMS, both channels driven
    500 watts x 2 @ 4 Ω RMS, both channels driven
    1000 watts x 1 @ 8 Ω, in bridged mode
    Circuitry designed by legendary John Curl
    High bias Class A/AB operation
    60 amperes peak current per channel
    Stable with speaker impedance dips to 1.5 Ω
    Balanced inputs with discrete circuits
    CHK Infinium, custom 5-way speaker binding posts
    Gold-plated RCA input & loop output jacks
    Direct-coupled signal path, no capacitors or inductors
    DC Servo and relay protection circuits
    AC turn-on inrush surge protection with relay bypass
    JFET input stage, MOSFET driver stage
    16 beta-matched 15 ampere, 60 MHz bipolar output transistors
    1.3 kVA shielded toroid transformer w/ independent windings for each channel
    Independent power supplies for the input stage, driver stage and output stage
    108,000 µF filter capacitors for output stages
    Full power is rated all the way down to 5Hz for unrestricted low-end bass
    Harris hyper-fast soft-recovery bridge diode rectifiers
    Automatic turn-on by 12 V trigger or audio sensing
    4 rack space chassis with rear carry handles
    Rack mount hardware is included
    Available in silver or black


    SPECIFICATIONS:

    Power Output – Stereo Mode (0.1% THD)
    300 watts x 2, 8 Ω both channels driven
    500 watts x 2, 4 Ω both channels driven

    Power Output – Bridged Mode (0.1% THD)
    1000 watts x 1, 8 Ω
    Bridged 4 Ω operation is not recommended

    Power measurement is at 120 VAC:
    0.1% THD, RMS continuous power,
    full audio band (20 Hz - 20 kHz)

    Current Capacity
    60 amps peak, per channel

    Slew Rate
    > 130 volts per microsecond

    Frequency Response
    5 Hz - 100 kHz, +0/-3 dB
    20 Hz - 20 kHz, +0/-0.25 dB

    Total Harmonic Distortion (THD)
    < 0.1 % at full power
    < 0.03 % at typical listening levels

    IM Distortion
    < 0.04 %

    TIM
    Unmeasurable

    Inter-channel Crosstalk
    > 80 dB at 1 kHz
    > 70 dB at 20 kHz

    Input Impedance
    Unbalanced: 33 kΩ
    Balanced: 66 kΩ,(33 kΩ per leg)

    Total Gain
    29 dB

    Input Sensitivity for 28.28 V Output into 8 Ω
    Unbalanced: 1 V
    Balanced: 1 V per leg

    S/N Ratio
    > 115 dB, input shorted, IHF A-weighted
    > 110 dB, input shorted, unweighted

    Damping Factor
    > 1100 at 20 Hz

    DC Trigger Requirements
    +9 Vdc to +12 Vdc, 5 mA

    Audio Trigger Requirements
    2 mV - 10 mV

    XLR Pin Identification
    1 = Ground (Shield)
    2 = Positive
    3 = Negative (Return)

    Dimensions
    Width: 17-5/8" (448 mm)
    Height without feet: 7-1/8" (181 mm)
    Height with feet: 7-3/4" " (197 mm)
    Depth: 20" (508 mm)
    Depth with cables: 21-1/2" (546 mm)

    Net Weight
    71 lb. (32.2 kg)

    Shipping Weight
    88 lb. (39.9 kg)

    Power Requirement
    Standby: 1 Watt
    Idle (no music playing): 160 Watts
    Typical Listening levels: 300 Watts
    Maximum: 1400 Watts

Product Ratings

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Parasound Halo A 21+ Power Amplifier


Not available online, please call to order.
210-805-9927

Add Recommended Accessories

Shunyata Venom HC Power Cord, 5’
$249.00 Free Shipping!
Loading...

Description

MY TAKE: For more than twenty years Parasound has been a name synonymous with unmatched value. Their electronics are respected for both performance and reliability and compete with significantly more expensive products. Modestly priced, previous offerings have changed the common perception about the level of performance that can be achieved at the price point. With the introduction of the Halo line, Parasound looks to bring the same level of value and performance to a more upscale market. The ambitious Halo range spans the gamut from state of the art home theater offerings to high-end two-channel audio.

For some years, the legendary John Curl has worked with Parasound as a consultant. His input has dramatically influenced their products and is one of the reasons for the praise they’ve received from the audiophile community. The A 21+ is an accomplished two-channel amplifier capable of the dynamic impact required for home theater applications while retaining the ability to reproduce the subtlety and nuance of music. - Galen Carol

 

REVIEWS:

Positive Feedback: "The A 21+ represents a new unparalleled value in amplifier performance. Details like soundstage depth, focus, and texture are where the A 21+ puts real distance from the A 21. The A 21+ is exceptional and provided an awe-striking feel."
 


FEATURES (and comparison of A21 vs A21+):

Changes from the original A 21→A 21+

250 → 300 Watts (8Ω)
400 → 500 Watts (4Ω)
750 → 1000 Watts (bridged)
Filter cap: 88,000 uF → 108,000 uF
S/N: 112dB → 115 dB
THD (at full power): 0.2% → 0.1%
Crosstalk (20kHz): 63dB → 70dB
Transformer size: 1.2 kVA → 1.3 kVA
Weight: 60 LB → 71 LB
Refined Halo cosmetic with aluminum end caps & gold highlights
Updated rear panel with heavy duty speaker terminals from JC 5
Upgraded internal gold on gold audio connections
Updated auto turn-on circuit


FEATURES:

300 watts x 2 @ 8 Ω RMS, both channels driven
500 watts x 2 @ 4 Ω RMS, both channels driven
1000 watts x 1 @ 8 Ω, in bridged mode
Circuitry designed by legendary John Curl
High bias Class A/AB operation
60 amperes peak current per channel
Stable with speaker impedance dips to 1.5 Ω
Balanced inputs with discrete circuits
CHK Infinium, custom 5-way speaker binding posts
Gold-plated RCA input & loop output jacks
Direct-coupled signal path, no capacitors or inductors
DC Servo and relay protection circuits
AC turn-on inrush surge protection with relay bypass
JFET input stage, MOSFET driver stage
16 beta-matched 15 ampere, 60 MHz bipolar output transistors
1.3 kVA shielded toroid transformer w/ independent windings for each channel
Independent power supplies for the input stage, driver stage and output stage
108,000 µF filter capacitors for output stages
Full power is rated all the way down to 5Hz for unrestricted low-end bass
Harris hyper-fast soft-recovery bridge diode rectifiers
Automatic turn-on by 12 V trigger or audio sensing
4 rack space chassis with rear carry handles
Rack mount hardware is included
Available in silver or black


SPECIFICATIONS:

Power Output – Stereo Mode (0.1% THD)
300 watts x 2, 8 Ω both channels driven
500 watts x 2, 4 Ω both channels driven

Power Output – Bridged Mode (0.1% THD)
1000 watts x 1, 8 Ω
Bridged 4 Ω operation is not recommended

Power measurement is at 120 VAC:
0.1% THD, RMS continuous power,
full audio band (20 Hz - 20 kHz)

Current Capacity
60 amps peak, per channel

Slew Rate
> 130 volts per microsecond

Frequency Response
5 Hz - 100 kHz, +0/-3 dB
20 Hz - 20 kHz, +0/-0.25 dB

Total Harmonic Distortion (THD)
< 0.1 % at full power
< 0.03 % at typical listening levels

IM Distortion
< 0.04 %

TIM
Unmeasurable

Inter-channel Crosstalk
> 80 dB at 1 kHz
> 70 dB at 20 kHz

Input Impedance
Unbalanced: 33 kΩ
Balanced: 66 kΩ,(33 kΩ per leg)

Total Gain
29 dB

Input Sensitivity for 28.28 V Output into 8 Ω
Unbalanced: 1 V
Balanced: 1 V per leg

S/N Ratio
> 115 dB, input shorted, IHF A-weighted
> 110 dB, input shorted, unweighted

Damping Factor
> 1100 at 20 Hz

DC Trigger Requirements
+9 Vdc to +12 Vdc, 5 mA

Audio Trigger Requirements
2 mV - 10 mV

XLR Pin Identification
1 = Ground (Shield)
2 = Positive
3 = Negative (Return)

Dimensions
Width: 17-5/8" (448 mm)
Height without feet: 7-1/8" (181 mm)
Height with feet: 7-3/4" " (197 mm)
Depth: 20" (508 mm)
Depth with cables: 21-1/2" (546 mm)

Net Weight
71 lb. (32.2 kg)

Shipping Weight
88 lb. (39.9 kg)

Power Requirement
Standby: 1 Watt
Idle (no music playing): 160 Watts
Typical Listening levels: 300 Watts
Maximum: 1400 Watts