About
From the house of Ooberpad arrives Parasound Halo A 21+ Stereo Power Amplifier. The Halo A 21+ levels up the already best-in-class Halo A 21 via meticulously-engineered performance upgrades for a cleaner, ultra-low distortion sound, revised front panel cosmetics, and a revised rear panel layout offering enhanced features, too. Much more than the others in the league, this stately Parasound amp is a functionally sophisticated brute, that effortlessly delivers crashing crescendos in all their full glory while also aptly turning on a dime to recreate every nuance of a subtly quivering violin string.
Warranty
1-year manufacturer's warranty
Key Features:
- 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 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
Benefits of Parasound Halo A 21+ Stereo Power Amplifier:
Unprecedented Performance Upgrades
The performance of a power amplifier is majorly contingent upon the quality of its power supply, and Parasound went miles ahead with the A 21+, which boasts a 10% to 15% larger main power transformer compared to the previous model A 21. Transformer size has been levelled up from 1.2 to 1.3kVA, and the filter capacitance increases 20-30% from 88,000 uF for the A 21 to 108,000 uF for the new A 21+. You'll hear the pros of these upgrades as the A21+ presents barely perceptible distortion at full power. In fact, signal-to-noise measurements have been upgraded from 115 dB from the A 21's 112 dB. THD at full power is now a staggeringly low 0.1% compared to 0.2% for the A 21. Other performance upgrades comprise of tweaked input circuits for improved crosstalk specs (70 dB at 20 kHz compared to 63 dB) and upgraded internal gold on gold audio connections, leading to a cleaner signal path that's also more trustworthy and credible.
Upgraded Rear Panel Features and Layout with Revised Halo Front Panel Look
The rear panel of the A 21+ has been revised in terms of layout and latest, cutting-edge features. It is power-packed with upgraded speaker terminals, utilizing identical terminals to the JC 5 power 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 A 21+ have been replaced with 3.5mm jacks, and the audio trigger circuit has been updated for better low signal reliability.
The Halo series has always been well-renowned for its appealing aesthetics, and the look is even a notch better. Innovative front panel cosmetics include slim metal end caps replacing wider plastic end caps, and an extra gold metallic accent stripe along with the end cap, gold feet now on black units, and an engraved metal "Parasound" badge in place of the red "P."
Where to buy?
Buy Parasound Halo A 21+ Stereo Power Amplifier online at the best price in Mumbai, Delhi, Bangalore, Chennai and all across India. Enjoy expert, prompt and courteous customer service from the Ooberpad.com team. We will help you choose better and will give you all the support you need to take the right buying decision in India.
Technical Specifications of Parasound Halo A 21+ Stereo Power Amplifier:
| Brand & Model # | Parasound Halo A 21+ |
| 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 are 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 |
| Interchannel crosstalk |
> 80 dB at 1 kHz > 70 dB at 20 kHz |
| Input Sensitivity for 28.28 V Output into 8 Ω |
Unbalanced: 1 V Balanced: 1 V per leg |
| Input Impedance |
Unbalanced: 33 kΩ Balanced: 66 kΩ,(33 kΩ 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) |
| Power Requirement |
Standby: 1 Watt Idle (no music playing): 160 Watts Typical Listening levels: 300 Watts Maximum: 1400 Watts |
From the house of Ooberpad arrives Parasound Halo A 21+ Stereo Power Amplifier. The Halo A 21+ levels up the already best-in-class Halo A 21 via meticulously-engineered performance upgrades for a cleaner, ultra-low distortion sound, revised front panel cosmetics, and a revised rear panel layout offering enhanced features, too. Much more than the others in the league, this stately Parasound amp is a functionally sophisticated brute, that effortlessly delivers crashing crescendos in all their full glory while also aptly turning on a dime to recreate every nuance of a subtly quivering violin string.
Warranty
1-year manufacturer's warranty
Key Features:
- 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 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
Benefits of Parasound Halo A 21+ Stereo Power Amplifier:
Unprecedented Performance Upgrades
The performance of a power amplifier is majorly contingent upon the quality of its power supply, and Parasound went miles ahead with the A 21+, which boasts a 10% to 15% larger main power transformer compared to the previous model A 21. Transformer size has been levelled up from 1.2 to 1.3kVA, and the filter capacitance increases 20-30% from 88,000 uF for the A 21 to 108,000 uF for the new A 21+. You'll hear the pros of these upgrades as the A21+ presents barely perceptible distortion at full power. In fact, signal-to-noise measurements have been upgraded from 115 dB from the A 21's 112 dB. THD at full power is now a staggeringly low 0.1% compared to 0.2% for the A 21. Other performance upgrades comprise of tweaked input circuits for improved crosstalk specs (70 dB at 20 kHz compared to 63 dB) and upgraded internal gold on gold audio connections, leading to a cleaner signal path that's also more trustworthy and credible.
Upgraded Rear Panel Features and Layout with Revised Halo Front Panel Look
The rear panel of the A 21+ has been revised in terms of layout and latest, cutting-edge features. It is power-packed with upgraded speaker terminals, utilizing identical terminals to the JC 5 power 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 A 21+ have been replaced with 3.5mm jacks, and the audio trigger circuit has been updated for better low signal reliability.
The Halo series has always been well-renowned for its appealing aesthetics, and the look is even a notch better. Innovative front panel cosmetics include slim metal end caps replacing wider plastic end caps, and an extra gold metallic accent stripe along with the end cap, gold feet now on black units, and an engraved metal "Parasound" badge in place of the red "P."
Where to buy?
Buy Parasound Halo A 21+ Stereo Power Amplifier online at the best price in Mumbai, Delhi, Bangalore, Chennai and all across India. Enjoy expert, prompt and courteous customer service from the Ooberpad.com team. We will help you choose better and will give you all the support you need to take the right buying decision in India.
Technical Specifications of Parasound Halo A 21+ Stereo Power Amplifier:
| Brand & Model # | Parasound Halo A 21+ |
| 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 are 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 |
| Interchannel crosstalk |
> 80 dB at 1 kHz > 70 dB at 20 kHz |
| Input Sensitivity for 28.28 V Output into 8 Ω |
Unbalanced: 1 V Balanced: 1 V per leg |
| Input Impedance |
Unbalanced: 33 kΩ Balanced: 66 kΩ,(33 kΩ 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) |
| Power Requirement |
Standby: 1 Watt Idle (no music playing): 160 Watts Typical Listening levels: 300 Watts Maximum: 1400 Watts |
Parasound Halo A 21+ Stereo Power Amplifier
Country of Origin: Usa
