USER MANUAL  PRICING 


From the velvety black backgrounds and noise-free, stress-free musical presentation, the Model 555 amplifier enables a deep and satisfying sonic melding of the performer and performance. The tight, powerful and tuneful low frequencies and vibrant, delicate filigree of intricate detail spun from midrange to treble, fashion a listening experience that is, at once, a view into the reality of the depth and breadth of the musical gestalt.

Soundstage depth, breadth and dimensionality combine to present a vivid 3-d bloom of holographic images when the source material allows it. Unimpeded musical crescendos instantly dropping to total silence add to the illusion of the real thing occurring within the listening room.
Technology
  • MACHINED ALUMINUM CHASSIS: The Model 555’s precision-machined chassis, milled from a solid block of aircraft grade aluminum, provides exceptional thermal heat transfer/dissipation, RFI/EMI shielding, resonance control, and minimizes microphonically induced micro-vibrations from any source
  • BALANCED TOPOLOGY: We utilize custom-designed ‘amorphous’ core input signal transformers. These transformers are processed with smaller “micro-magnets” in the core material for increased low level signal resolution, as compared to standard permalloy core audio transformers. Cardas .9999 purity copper wire is used for coil windings.
  • HIGH-PRECISION SURFACE MOUNT COMPONENTS: Extensive use of lead- (Pb) free, low temperature coefficient, active and passive surface-mount components results in significantly smaller loop areas, reduced circuit capacitance and inductance, and introduces less noise than conventional lead-based components.
  • LOW DISTORTION AND SUPERIOR DAMPING FACTOR: The Model 555 exhibits extremely low high frequency distortion and nearly constant damping factor over the entire audio frequency range due to unique error correction circuitry and transimpedance circuit architecture.
  • TEFLON-INSULATED WIRES: All signal carrying input and output wires are silver-Teflon insulated for low dielectric energy storage, ensuring that each audio note naturally decays into the deeper silence of the music.
  • TRANSFORMER-COUPLING AND ISOLATION: Transformer-coupled input circuitry provides universal component compatibility and virtually eliminates ground loop noise and RFI/EMI.
  • ACTIVE POWER FACTOR CORRECTION: Power Factor Correction (PFC) integrated into the power supply reduces AC line harmonic noise pollution and increases AC line power utilization to 97%.
  • HIGH-EFFICIENCY SWITCH-MODE POWER SUPPLY: The highly efficient, compact, lightweight, switched-mode power supply provides optimum voltage regulation for the output stage circuitry. A separate low-voltage, extremely low-noise, regulated power supply provides power to all front-end low-level circuitry.
  • OUTPUT SIGNAL AND POWER BUSSING: Each output transistor is directly tied to rigid copper power busses which provide low impedance, low noise connections to DC power and loudspeaker outputs.
  • LONG LIFE POWER ON-OFF SWITCHING: AC mains power is switched through a zero-crossing solid state relay, eliminating switch contact burn-out, and eliminates large surge currents during turn-on, resulting in a lifetime of trouble-free power switching operations.
  • LOUDSPEAKER OUTPUTS: CE approved speaker output terminals require no tools for secure, low resistance connections. Rhodium coated copper posts machined for minimal surface area assure low signal impedance over all audio frequencies.
  • REMOTE ON/OFF: A 1/8” (3.5mm) mini plug jack on the rear panel permits amplifier power on/ standby switching in remote and home theater applications.
  • MONO OPERATION: The amplifier can easily be converted to MONO operation by simply switching the STEREO/MONO switch to MONO and using the MONO labeled XLR input and MONO labeled speaker terminal output..
  • OPTIMUM POWER SUPPLY USAGE: The Model 555 incorporates a unique internal configuration which inverts the absolute phase of the Left channel signal circuitry. Read more about this innovation in the Model 555 User Manual.
 
Specifications
Output PowerStereo: 2 X 150W / 8 Ω, 2 X 300W / 4 Ω; 2 X 500 W / 2 Ω; Mono: 1 X 350W / 8 Ω, 1 X 550W / 4 Ω
Frequency Response10 Hz – 75 kHz, -3 dB
Dynamic Range120 dB, A Weighted
Output Noise135 microvolts, A weighted
Intermodulation Distortion(CCIF,19 kHz + 20 kHz) 0.0005%, @10 watts
Input Impedance40k Ω
THD + Noise< 0.003%, 2kHz -20 kHz
< 0.06% 50 Hz - 2kHz @ 40 watts output, 8 Ω load
Damping Factor300 @ 1kHz, 170 @ 20 kHz
Output DC offset< ± 8.0 millivolts
Overall Gain26 dB Stereo or Mono
Common Mode Rejection Ratio> 90 dB, 20 Hz - 20 kHz
Inputs2 (XLR) Stereo, 1 (XLR) Mono, pin 2 +
Outputs2 pair binding posts Stereo, 1 pair binding posts Mono
Idle Power Consumption80 watts
Max Power Consumption1000 watts @ 550 W/4 Ω, mono
AC Mains Input Voltage85-265 Volts @ 50/60 Hz
Standby Power Consumption0.3 watts
Power Factor0.78 @ idle, 0.98 @ > 80 watt output
Amplifier Weight33 lbs / 15 kg
Amplifier Dimensions (h/w/d)3.9” x 15.5” x 14.2” / 9.9 cm x 39.4 cm x 36 cm
Shipping Weight41 lbs / 18.6 kg
Shipping Box (h/w/d)9” x 24” x 22” 23 cm x 61 cm x 56 cm