CH Precision - A1.5 - 2 Kanal Endstufe

Ein musikalisches Ausnahmegerät

(2 x 150W RMS 8Ω)

Der CH Precision A1.5 ist etwas vom Feinsten der analogen Verstärkungstechnologie.

Er ist auch unendlich flexibel und konfigurierbar. Im MONO bridged Modus bietet er 1200 Watt Dauerleistung unter 2 Ohms! 

Alle fantastischen CH Precision Musik Instrumente werden in der +Schweiz+ entwickelt und gebaut.

Mehr Infos

34'200.00 CHF

Auf meine Wunschliste

Technische Daten

Height198 mm
Width440 mm
Depth440 mm
Weight47 kg

Mehr Infos

Der A1.5 bringt jedes Detail zu Gehör, integriert diese Einzelheiten aber zu einem musikalischen Ganzen

Panta rhei – Alles fließt

Der A1.5 steht vor genau den gleichen Herausforderungen wie der M1.1 und verkörpert denselben ausgeklügelten, modularen und skalierbaren Ansatz. Er bietet weiterhin die gleiche anpassbare, softwaregesteuerte Topologie, einstellbare Eingangskonfiguration und -verstärkung, ein vom Benutzer wählbares globales Feedback-Verhältnis und einen kostengünstigen Upgrade-Pfad. Er bietet genau den gleichen, unglaublich kurzen Signalweg, eine vollständig diskrete, vollständig symmetrische und vollständig komplementäre Schaltung, die mit denselben sorgfältig ausgewählten Komponenten nach denselben hohen Standards gebaut wurde. 

Tatsächlich ist der A1.5 in jeder wichtigen Hinsicht buchstäblich ein M1.

Technische Eigenschaften:

Modularity:

The A1.5 power amplifier has been developed with modularity in mind. It can be equipped with a single analog input board in case the A1.5 is used as a single channel but a second analog input board can also be fitted from factory for stereo operation. This modularity ensures the following operation modes:
  • stereo mode
  • single channel (mono) mode
  • bi-amplification modes, both passive and active
  • bridge mode

Changing the A1.5 operating mode is easy and can be done on-the-fly from the front panel user interface and our tablet app. Only the available options are visible depending of the hardware configuration.

Power Supply:

The central power supply is taking most of the internal space of the chassis. The huge 1'700VA transformer is mounted on silent-blocks to avoid at maximum its vibrations to be fed-back into the sensitive part of the circuitry.

It is shielded both with a magnetic screen and an electrostatic one. The transformer plate is also secured for transportation. For optimum thermal performances, the output stage diode bridges are mounted directly onto the amplifiers heatsinks and are of hyper-fast soft-recovery type.

The A1.5 features extremely low-ESR filtering capacitors ensuring tremendeous current capabilities for controlling the most demanding speakers.

Analog stages:

All analog stages inside the A1.5 are built only with discrete components, no operational amplifier have been used into these sections. This deliberate choice warranties the shortest audio signal path and allows the use of custom-made building blocks.

No capacitors have been used in the signal path, nor any output relay to ensure maximum transparency.

Gain:

A gain range of 24dB - with steps of 0.5dB - is embedded into each channel, for a perfect match with the loudspeakers sensitivity and room size. A lower gain is typically preferred for high-sensitivity speakers into a small room while a bigger gain is sometimes needed for large rooms with low-sensitvity loudspeakers.


This gain adjustment can also be useful with multi-amplified loudspeakers to fine-tune the various drivers level.

Output stage feedback:

The A1.5 output stage features the renown CH loudspeaker matching circuitry. The ratio between the global and local feedbacks is adjustable on-the-fly from the front panel user interface or through our tablet app. Like the A1, the A1.5 has 6 feedback ratio positions. But finer tuning is available at low global feedback, so global/local feedback ratios of 0/100, 10/90, 20/80, 40/60, 70/30 and 100/0 are available.

A different feedback ratio can be set for each channel in bi-amplification mode allowing an even finer tuning of the connected loudspeaker.

ExactBias:

Keeping the output stage bias current constant ensures the amplifier to remain as linear as possible. The bias current is highly sensitive to temperature changes. ExactBias has been designed to maintain the output stage bias current constant, by monitoring both the amplifier heatsink and output transistors temperatures, irrespectively of the musical program and room temperature.


In terms of performance, the A1.5 class-AB designed with ExactBias technology outperforms a pure class-A design with usual bias compensation.

Option board:

Control: Ethernet control board
General control board. Provides USB based firmware update and external ethernet control.
Factory built-in

Analog-Buf: Monaural analog input buffer board
Three analog inputs - XLR, RCA and BNC - are provided on a single board. A pass-through XLR male connector allows a direct connection to another amplifier like the M1.1 or another A1.5.
Can be factory ordered for Left or Right channel.
Factory built-in (1x), second board is needed for stereo operation
CHF 1'700.- TTC mono

Analog inputs

Inputs typeBalanced (XLR), one connector per board
Single-Ended (RCA & BNC), one connector per board
Input impedanceBalanced: 94kΩ
Single-Ended: 47kΩ or 300Ω
Input stageJFET input stage
Ultra-low noise, discrete fully differential stage
24dB range adjustable gain in 0.5dB steps

Amplification

Amplification stageUltra-low noise full discrete class AB design
5 pairs of complementary output transistors
Output Power2x 150W / 8Ω, 2x 275W / 4Ω, 2x 450W / 2Ω in stereo and bi-amp modes
1x 275W / 4Ω, 1x 450W / 2Ω, 1x 700W / 1Ω in monaural mode
1x 550W / 8Ω, 1x 800W / 4Ω, 1x 1200W / 2Ω in bridge mode
BiasPatent-pending bias circuitry for constant bias operation
FeedbackUnique user programmable local/global feedback ratio of the amplification stage
BandwidthDC to 450kHz (-3dB) at 1W into an 8Ω resistive load
Signal to Noise RatioBetter than 115dB in stereo and bi-amp modes
Better than 118dB in bridge mode
Total Harmonic Distortion + NoiseLess than 0.1% with 0% global feedback
Less than 0.01% with 100% global feedback

Analog outputs

Binding postsTwo pairs of Argento binding posts for loudspeakers connection
MonitoringNon-intrusive DSP-based protection of the amplifier
Instantaneous voltage & current values are permanently monitored for each channel
ProtectionsShort-circuit protected
Disconnected loudspeaker detected
Over-temperature of the heatsink
Over-temperature of the output transistors

Power supply

Transformer1'700VA single transformer, oversized for low-noise operation
Power capacitors 2x 82'000uF/63V capacitors with ultra-low ESR/ESL
RegulatorsNon-regulated symetrical power supply for the power stages
Eight local regulation stages for input/driver stages
Seven local regulation stages for the logic/display

General

Display480x272 pixels, 24bits color, AMOLED
Mains operationSelectable 100V, 115, 230V AC, 47-63Hz
Fuses value and locationStandby fuse (diameter 5mm): 250mA T (230V AC), 500mA T (100V AC, 115V AC) 
Power fuse (diameter 6.3mm): 10A T (230V AC), 20A T (100V AC, 115V AC)
Power supply consumption<1W (standby), 1800W max in operation
Remote controlEthernet based system control via the Android CH Control App

Einige unserer Auszeichnungen

award-hifireview-A1-5.jpg
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a1-5-two-channel-power-amplifier

Optionale monaurale Analogeingangskarte für Hardware

  • Optionskarte für Stereo- und aktive Anwendungen erforderlich (nur die benötigten Eingänge kaufen)
  • XLR-, Cinch- und 75-Ohm-BNC-Eingänge
  • Ausgewogener Durchgang für Verkettungsverstärker in Multi-Amp-Systemen
  • Bestehende A1-Verstärker können werkseitig auf die vollständige A1.5-Spezifikation aufgerüstet werden

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CH Precision - A1.5 - 2 Kanal Endstufe

CH Precision - A1.5 - 2 Kanal Endstufe

Ein musikalisches Ausnahmegerät

(2 x 150W RMS 8Ω)

Der CH Precision A1.5 ist etwas vom Feinsten der analogen Verstärkungstechnologie.

Er ist auch unendlich flexibel und konfigurierbar. Im MONO bridged Modus bietet er 1200 Watt Dauerleistung unter 2 Ohms! 

Alle fantastischen CH Precision Musik Instrumente werden in der +Schweiz+ entwickelt und gebaut.

Eigene Bewertung verfassen