The 2000 series uses DC amplifiers with excellent response at very low frequencies and makes maximum use of its DC circuitry design. As is becoming standart in precision equipment, ROTEL's DC amps have eliminated all capacitors (which give unwanted time constant) from the signal path and the negative feedback loop, stabilized the DC range and greatly improved transmission characteristics, enabling superior low frequency performance. On the other hand, negative aspects of DC circuitry such as DC drift due to fluctuations in input and in power supply have been eliminated in the 2000 series by stabilizing the differential's mid-point electric potential, using circuit technology to achieve a DC balence, and securing an adequate CMRR (Common Mode Rejection Ratio) value. As a result, the audio enthusiast is even free to enjoy the full dynamics range of organ music, with all its low frequency signals.
The Rc-2000 direct phono switch has a uuique function in that when "ON" it gives priority to the optimum phono circuitry throughout the system (making it possible to set the shortest signal route for PHONO) - it eliminates alltone and frequency selection controls except for LOUDNESS and the subsonic filter option but leaves level controls (volume, balance, and muting) operative. Needless to say, it also disconnects the PHONO circuits from the tape monitor controls but leaves them open for tape recording. In essence, this provides direct connection between the record player and the speakers, and is one of the most advanced functions of the RC-2000.
ROTEL RC-2000 use a 2-stage Dc connected differential input, input circuit with low noise FET. With a push-pull output stage, this results in excellent S/N, high overload capacity, and accurate input impedance.
The MC head amplifier built into the RC-2000 use Dc circuitry without capacitors in the input stage. The entry for signals from the MC (moving coil) cartridge is a FET differential with perfect symmetry to both negative and positive input signals. The output stage uses a pure complimentary push-pull cicuit. This results in an input sensitivity/impedance value of 0.1 mV/33 ohms With a built-in MC head amp it becomes possible to enjoy music without having to use an external headamp or booster transformer even with a high performance MC type cartridge.
REMOTE LOCATION SWITCH
Remote location switches are used for the phono selector, recording selector, and function selector. The control knobs are connected by flat and flexible drive cables extending from the front panel to the rear panel switches. The eliminates the S/N and distortion problems caused by use of many interconnecting joints and wires and further improves the overall circuitry by permitting an ideal placement of vital parts.
OPTIMUM PHONO IMPEDANCE AND LOAD CAPACITANCE SWITCH
(FOR MM CARTRIDGES)
2 switches are attached to the above ROTEL models which make it possible to create the optimum load conditions for MM (moving magnet)cartridges. These permit choise of three impedance loads (35 kohms, 50 kohms, and 70 khoms) and 3 additional capacitance positions (0,100,200 pF) on the PHONO 1.
A separate recording selector switch is attached to the above models which makes it possible to choose the signal desired for recording regardless of the source input one may by listening to. For example, this makes it possible to record from a record disc while listening to FM.
2-WAY TAPE DUBBING
Since the tape monitor switch and the recording selector function independent of each other, dubbing between 2 tape decks is possible irregardless of what is being played through the amplifier. Simple operation of the switch permits dubbing between 2 tape recorders in either direction.
Use ofa DC amp style tone control that eliminates coupling capacitors from the NF loop guarantees accurate reproduction even at low frequencies. Beacuse of this circuitry design, placing the TONE DEFEAT switch "ON" allows operation as a totally flat buffer amp.
Turnover frequencies for both BASS and TREBLE are switchable between 2 options, allowing for wide variation in possibilities. Control range is +/- 10dB. RC-2000uses independent controls for both left and right channels, permitting precise function.
SUBSONICS AND SUPERSONIC FILTERS
ROTEL 2000 series comes equipped with two filters - subsonic and supersonic - that eliminate unwanted components from the very high or very low frequency ranges. Unwanted elements from frequency ranges inaudible to the human ear can have a negative effect on the audible range due to intermodulation and excessive base speaker cone excursions. The ROTEL filters eliminate these at 12 dB/oct slope to provide perfect reproduction of the original sound.
Phono MAG : 0.004%
Phono MC : 0.006%
RIAA deflection (20 Hz - 20 kHz): ±0.2 dB
Phono1 MAG : 2 mV/35, 50, 70 kΩ/0, 100 or 200 pF
Phono2 MAG : 2 mV/50 kΩ
Phono3 MC : 100 mV/33 Ω
Maximum permissible input (1 kHz, THD 0.5%):
Phono MAG : 400 mV
Phono MC : 20 mV
THD: 0.008% (at the time of an output power 20 Hz - 20 kHz)
Frequency characteristic: 4 Hz - 160 kHz
S/N ratio (IHF-A network):
Tuner, Aux : 95 dB
Tape monitor : 95 dB
Remains noise (at the time of a volume min): 6 mV; 100 dB
Tuner, Aux : 150 mV/ 50 kΩ
Tape monitor : 150 mV/50 kΩ
Maximum permissible input (1 kHz, THD 0.5%): 15 V
Subsonic Filter: 15 Hz, 12dB/oct
Supersonic filter: 24 kHz, 12 dB/oct
Bass : 150/400 Hz
Treble : 7/2,5 kHz
Bass : ±5 / ±10 dB
Treble : ±5 / ±10 dB
Max. power consumption: 30 W
Dimensions (W x H x D): 482 x 143 x 333 mm
Weight: 10 kg