Parasound A21+ Effekt forsterker

The A 21+ represents a
new unparalleled value in
amplifier performance

- Positive feedback

Parasound A21+ Effekt forsterker

..extremely high
performance-per-dollar
is still possible today
when a company
leverages decades
of experience

- Positive Feedback

Parasound A21+ Effekt forsterker

PARASOUND HALO A21+

Parasound A21+ er en oppgradert versjon av den A21 som har vært en av markedets aller mest solgte effekt forsterker. Fidelity skrev i sin omtale «Her er det krefter i overflod, og hele redaksjonen har fått bakoversveis». På A21+ er effekten økt med ytterligere 25%, med enda bedre signal-støyforhold, mindre crosstalk, større trafo, ultra-lav forvrengning måler nå 0,1%, nye bedre høyttaler terminaler og selvfølgelig kommer den med Halo sitt nye utseende.
Parasound Halo A21+ er en effektforsterker på hele 300 watt per kanal i 8 ohms-drift. Halveres høyttalerbelastningen til 4 ohm yter den hele 2 x 500 watt, eller kan brokobles og den oppnår 1000 watt!
A21+ er en ekstraordinær forsterker i hjemmekino- eller i dedikerte stereoanlegg. Den massive toroid-transformatoren er innkapslet i en stålboks for å begrense magnetiske felt og redusere uønsket støy. Raske filterkondensatorer av ypperste kvalitet gir enorme reserver for raske transienter m.m. 

A21+ skiller seg ut

Hver komponent i A21+ er nøye valgt for sin nøyaktighet og pålitelighet. Metallfilm motstander med 1% toleranse er valgt for deres presisjon og fordi verdiene ikke drifter når de varmes opp under drift.
Polypropylen og glimmer kondensatorer brukes i stor grad for deres overlegne linearitet og lav dielektrisk absorpsjon. Halvledere er valgt for overlegen ytelse i sine spesifikke kretser. Gull har den beste konduktiviteten til ethvert metall, så A21+ benytter høyverdig gullbelagte inngangskoblinger og høyttaler terminaler. Chassiset er laget av «heavy gauge» stål for å sikre de interne kretsene. Denne fokus på kvalitet i alle ledd utgjør forskjellen mellom en veldig god forsterker og en fremragende forsterker. Parasound Halo A21+ er ren ingeniørkunst bygget for mange år med gode lytteopplevelser.

Refinement is where the A21+ puts real distance from the A21. Small, but quintessential details like soundstage depth, focus, and texture seem to have received a significant boost.
– Positive Feedback

A21+ OMTALER

The A21+ represents a new unparalleled value in amplifier performance

- Positive Feedback

..that extremely high performance-per-dollar is still possible today

- Positive Feedback

Refinement is where the A21+ puts real distance from the A21

- Positive Feedback

Parasound A21+ galleri – trykk for større bilde

Klipp fra omtaler av Halo A21+

 

The A21+ represents a new unparalleled value in amplifier performance. .. It would be difficult get more amplifier without pursuing a home equity loan, or at least a small automobile loan. The Halo A21+, is a keeper.
– Positive Feedback

Listening to the A 21+ was eminently delightful and satisfying from the first note.
– Stereophile

Anyone in the market for a stereo power amp would be well advised to consider the Parasound A 21+, especially those who believe that they must spend more. 
– Stereophile

Parasound has chosen to take a staple core product that has remained an exceptional value for over fifteen years, the Halo A21 amplifier, and re-spin it into the Halo A21+. Doing so has proved that extremely high performance-per-dollar is still possible today when a company leverages decades of experience, and is spearheaded by a legend…
– Positive Feedback

Refinement is where the A21+ puts real distance from the A21. Small, but quintessential details like soundstage depth, focus, and texture seem to have received a significant boost.
– Positive Feedback

The Pragmatists at Parasound chose to re-spin the A21 amplifier into the A21+. The former tried and true, untouchable value and staple of their product line, the A21, had set the bar for value vs. performance in both the HiFi and Professional audio worlds. The move to improve it was risky, since it is usually difficult to de-throne a king without a total re-design of the kingdom. Parasound however, pulled it off exceptionally.
– Positive Feedback

  • 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
  • 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

Endringer fra original A21→A21+

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

Genskaper

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 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

Dokumentasjon om alle Parasound produkter

 

Parasound Manualer Parasound Brosjyrer

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