ACCUSTIC ARTS® POWER I – MK 4: The long-term audiophile hit

The ACCUSTIC ARTS® POWER I – MK 4 was presented in 2015 and it’s the 4th generation of this brilliant integrated power amplifier, our long-term audiophile “hit”, manufactured since 2002. The current MK 4 version once again exploits a tried and tested circuitry technology and includes a number of improvements.

POWER I-MK4 highlights

  • Audiophile integrated stereo power amplifier with high output performance
  • 8 selected MOS-FET output transistors of highest quality
  • Shielded and encapsulated 600 VA toroidal core transformer of premium quality for high output reserves; separate windings for preamp section, for power amp section and for right and left channel
  • Integrated, switchable headphones amplifier of premium quality
  • Very good smoothing thanks to more than 80.000 µF power supply capacity
  • High damping factor for high output reserves
  • Integrated protective circuit switches ascents off when clipping, HF oscillations or too high DC offset occurs
  • Constant low operating temperature due to generously dimensioned heat sink
  • 2 x balanced high level inputs (XLR)
  • 2 x unbalanced high level inputs (RCA)
  • 1 x unbalanced input (RCA) can be configured as high level input or “SURROUND-BYPASS”
  • 1 x unbalanced pre-output (RCA)
  • Premium quality, gold-plated speaker terminals
  • Premium quality relays and premium quality rotary switch with gold-plated silver contacts for the input selection
  • Encapsulated high grade volume potentiometer
  • Full metal housing for optimum shielding
  • Front panel made of brushed aluminium; turning knobs/push buttons made of massive and chromed brass
  • ACCUSTIC ARTS® remote control RC II
  • ACCUSTIC ARTS® POWER I-MK4 is “Handmade in Germany”

Specifications

Inputs:
2 x balanced high level inputs (XLR)
2 x unbalanced high level inputs (RCA)
1 x unbal. as high level input or SURROUND-BYPASS (RCA)

Headphones output:
1 x metal female jack 6.3 mm; 34 Ω

Output:
1 x unbalanced pre-output (RCA); 34 Ω

Signal difference left/right:
< 0.4 dB (from 0 dB to -40 dB)

Input resistance:
balanced: 2 x 50 kΩ
unbalanced: 50 kΩ

Total transformer power:
max. 600 VA (watts)

Power supply capacity:
more than 80,000 µF

Rated power output (at THD+N = 0.1 %):
2 x 200 watts on 4 Ω
2 x 135 watts on 8 Ω

Rise time / fall time:
4.6 µs with 4 Ω load

Distortion (THD+N):
0.0069 % on 4 Ω load with 1 kHz and 10 watts
0.0044 % on 8 Ω load with 1 kHz and 10 watts

Signal-to-noise-ratio:
-97 dBA (ref. 6.325 V) – A weighted

Damping factor:
> 700

Power Consumption:
approx. 60 watts (without load)

Dimensions (H x W x D):
145 x 482 x 450 mm / 5.7 x 19 x 17.7 inches

Weight:
approx. 22 kg / 48 lbs.