The Heritage power amplifier is the latest high-end amplifier from Orpheus.
Its internal topology is based on a complete dual mono architecture. The
amplifier has several operating modes: stereo, mono and bi-amp. The rated output
power is of 2 x 250W in stereo and bi-amp mode. In mono mode the output power is
of 1 x 1000W (on 8 Ohms). Using two separated power supplies and amplifier
boards in stereo and bi-amp mode, makes the two channels of the amplifier
totally independent to minimize channel-to-channel crosstalk. In mono mode all
the cards are interconnected together in order to deliver the maximum power to
the load. The different modes of the amplifier and its high power allows it to
be used with a wide range of speakers.
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The power amplifier uses a class AB output stage based on four hand matched
pairs of mosfet power transistors per amplifier board. Mosfet transistors
advantages are numerous compared to usual bipolar transistors. Lower ¡®ON¡¯
resistance and the way that the power is identically distributed between the
transistors makes them more efficient to transmit more power to the load rather
than dissipating it as useless heat. Mosfet technology also has higher switching
speed resulting in a faster, sharper and more accurate response compared to
bipolar systems. The output stage is biased with a precise voltage to set the
operating point of the power transistors to get extremely low THD and
exceptional audio performances (THD of 0.01% for 200W on a 8¥Ø load in stereo and
bi-amp mode). Thermal compensation of the output stage has been also developed
in order to avoid overheating the transistors when they are strongly solicited.
Several internal protections are constantly monitoring the instantaneous power
consumption, power supplies voltages and currents and heat sink temperatures of
the amplifier.
The two low-noise power transformers are able to provide a total amount of
power of 2000VA to the amplifier when used in mono mode. The total capacitance
of the power supplies in mono mode is more than 180mF. The oversized power
supplies guarantees the unit to provide large peak currents and stable voltages
even when delivering high output power. Heat sinks have been cleverly integrated
into the chassis to optimize heat dissipation assuring perfect operating
conditions. Its outstanding specifications, imposing size and weight (50kg) is
followed by refined and stylish curves that makes this anodized aluminium piece
of art remarkably stand
Amplifier modes stereo /
bi-amplifier / mono Output stage Class AB Analog inputs 2 x
unbalanced 2 x balanced Outputs Dual speaker terminals allowing
stereo and mono connections Input sensitivity 2 Vrms on XLR for the
maximal rated power 1 Vrms on RCA for the maximal rated power Output
power Stereo mode on 8 [¥Ø] load: 2 x 250 W Mono mode on 8 [¥Ø] load:
1 x 1000 W
Gain Stereo RCA: 45.4 V/V; 33.1 dB Mono
RCA: 87.1 V/V; 38.8 dB Stereo XLR: 22.4 V/V; 27.0 dB Mono XLR: 43.5 V/V; 32.8 dB
Total Harmonic Distortion + Noise (THD+N) Stereo mode / 200 W on 8¥Ø
THD+N: 110 dBr Mono mode / 800 W on 8¥Ø THD+N: 110 dBr Signal to Noise
Ratio (SNR) Stereo mode / 200 W on 8¥Ø SNR: 105 dBr Mono mode / 800 W on 8¥Ø
SNR: 105 dBr Input impedence 94 K ¥Ø on XLR 47K ¥Ø on RCA Output
impedence 10m ¥Ø Slew rate on 8 ¥Ø 35 V/¥ìs
Linearity 20W on
8 ¥Ø +/- 0.06 dB (from 20 Hz to 20 KHz) Maximal voltage swing 130 V (-65 V to
+ 65 V) Maximum RMS voltage Stereo mode 2 x 45 V Mono mode 1 x 90 V
Maximum output current Stereo mode 2 x 13 A Mono mode 1 x 26 A
Propagation delay 650 ns Power consumption Idle: 95W Standby: 3W
Dimension 440 x 420 x 200 mm Weight 50
Kg