A collaboration between Dave Reich, Theta Digital’s chief engineer and Bruno Putzeys, class D "Wonderkind" of Hypex fame, Prometheus marks a fundamental departure in our amplifier philosophy. Rather than design amplifiers that highlight the amp/speaker interface and demand careful consideration when choosing the corresponding transducer, Prometheus is completely load agnostic.The frequency response is load invariant. Harmonic distortion, at less than 0.01% at 500 watts RMS full-band at 4 ohms is virtually non-existent. The same is true for IMD.
"First Watt" advocates will happily note THD+N at one watt is lower by a factor of 10: < 0.001%. Notable also is the fact that Prometheus shares with its other N-Core 1200 brethren the lowest output impedance (and highest damping factor) of any amplifier every built. To say that Prometheus exerts the iron-hand of speaker control is a masterpiece of understatement.
In true Theta Digital tradition, Reich and cohorts researched virtually every possible power source before settling on a huge linear supply. For proof, one need only look at the immense 1.44kva toroidal power transformer. Such a dramatic power source insures that Prometheus can deliver full output for any desired duration. All day and all night? No problem.
Parts quality continues in adherence to strict Theta hierarchy. Use only the best parts: Check. Use them the right way: Check. Make the amplifier absolutely beautiful both inside and out: Check.
In Greek mythology, Prometheus stole fire from the gods and gave it to mankind. In our Theta Digital mythology, Reich and Putzeys stole amplifier perfection from the gods and gave it to music lovers everywhere.
Specifications:-
Analog Audio Inputs:
1 Single-ended RCA jack.
1 Balanced (XLR) jack.
Input Impedance:
47 kOhms. Single-Ended or Balanced, for each phase.
Input sensitivity:
(Single-Ended) 1.825V RMS input for 250W into 8 ohms.
(Balanced) 1.825V RMS input for 250W into 8 ohms.
Gain:
(Single-Ended) or (Balanced) 27.8 dB
Polarity:
(Single-Ended) Non-Inverting.
(Balanced) Pin-2 = Positive, Pin-3 = Negative for Non-Inverting Output.
Analog Audio Outputs:
2 balanced outputs (Cardas Type) suitable for bi-wiring.
Modes/Processes:
Standby: Amplifier is ready to be turned on via front panel switch or remote trigger..
Overcurrent, D.C., and/or thermal protection: amplifier will cycle.
Catastrophic D.C. or output stage failure: Amplifier will shutdown.
Power Output:
8 Ohms: 250W RMS (24 dBW) with less than 0.01% THD from 20 Hz to 20 kHz; 300W RMS (24.77 dBW) with less than 1.0% THD from 20 Hz to 20 kHz; 350W RMS (25.44 dBW) with less than 1.0% THD, 1 kHz; 395W RMS (25.97 dBW) with less than 1% THD, 1 kHz, Burst Mode
4 Ohms: 500W RMS (27 dBW) with less than 0.01% THD from 20 Hz to 20 kHz; 700W RMS (28.45 dBW) with less than 1.0% THD from 20 Hz to 20 kHz; 800W RMS (29 dBW) with less than 1% THD, 1 kHz, Burst Mode
2 Ohms: 850W RMS (29.24 dBW) with less than 0.01% THD from 20 Hz to 20 kHz; 950W RMS (29.78 dBW) with less than 1.0% THD from 20 Hz to 20 kHz.
Frequency Response:
+0, -.5 dB 0 Hz to 20 kHz; Load Independent.
Damping Factor:
Greater than 6500 at 100 Hz; Greater than 2500 (minimum) at any frequency up to and including 20 kHz
Signal to Noise Ratio:
124 dB referenced to rated output (A-Weighted)
Miscellaneous:-
Power Requirements:
117 VAC, 10A Slo Blo main fuse, 230 VAC, 6A Slo Blo main fuse, 50-60 Hz.
Power Consumption:
Less than 1W @ Standby; Less than 40W @ idle; Less than 12ooW maximum.(950W; 2 ohms)
Trigger Input:
5-12 VDC; Steady State
Dimensions:
9 1/16" W x 13 7/8" H x 20" D (230 x 346 x 508 mm)
Weight:
54.5 Lbs. Stand alone (24.6 kg)
64 Lbs. Boxed with accessories (29 kg)
Maximum Operating Temperature:
Internal: 176° F (80° C)
Room: 131° F (55° C)