Studio Reference I & II Professional Studio Amplifiers
6 Specifications
The following applies to units in Stereo mode with 8 ohm loads and an input sensitivity of 26 dB gain unless otherwise specified.
Standard 1 kHz Power: refers to maximum average power in watts at 1 kHz with 0.1% THD and noise.
Full Bandwidth Power: refers to maximum average power in watts from 20 Hz to 20 kHz with 0.1% THD and noise.
Performance
Frequency Response: ±0.1 dB 20 Hz to 20 kHz at 1 watt (see Figure 6.5).
Phase Response: +5 to
Signal-to-Noise: (A-weighted)
Studio Reference I : Greater than 120 dB below rated full bandwidth power.
Studio Reference II : Greater than 117 dB below rated full bandwidth power.
Total Harmonic Distortion (THD): Less than 0.02% at rated
Intermodulation Distortion (IMD): (60 Hz and 7 kHz 4:1)
Studio Reference I : Less than 0.005% from full band- width power to 78 watts rising linearly to 0.025% at 78 milliwatts.
Studio Reference II : Less than 0.005% from full band- width power to 36 watts rising linearly to 0.025% at 36 milliwatts.
Damping Factor: Greater than 20,000 from 10 Hz to 200 Hz, and greater than 2,500 at 1 kHz (see Figure 6.6).
Crosstalk: (At rated full bandwidth power)
Studio Reference I : Better than 100 dB from 20 Hz to 100 Hz falling linearly to better than 70 dB at 20 kHz (see Figure 6.10).
Studio Reference II : Better than 100 dB from 20 Hz to 100 Hz falling linearly to better than 65 dB at 20 kHz (see Figure 6.10).
Common Mode Rejection (CMR): (At rated full band- width power) See Figure 6.9.
Voltage Gain: (With level controls set for maximum output) At the 26 dB gain setting, 20:1 ±3% or 26 dB ±0.25 dB.
Studio Reference I : At 0.775 volt sensitivity, 103:1 ±12% or 40 dB ±1 dB; at 1.4 volt sensitivity 57:1 ±12% or 35 dB ±1 dB.
Studio Reference II : At 0.775 volt sensitivity, 69:1 ±12% or 37 dB ±1 dB; at 1.4 volt sensitivity 38:1 ±12% or 32 dB ±1 dB.
Power
Power Bandwidth: (At standard 1 kHz power)
Studio Reference I :
Studio Reference II :
Output Power: The following are guaranteed minimums for
Studio Reference I
Stereo mode (with both channels driven): 1,160 watts into 4 ohms.
780 watts into 8 ohms.
Bridge-Mono mode:
2,220 watts into 8 ohms.
1,580 watts into 16 ohms.
Parallel-Mono mode:
2,315 watts into 2 ohms.
1,565 watts into 4 ohms.
Studio Reference II
Stereo mode (with both channels driven):
555watts into 4 ohms.
355watts into 8 ohms.
1,110 watts into 8 ohms.
715 watts into 16 ohms.
1,115 watts into 2 ohms.
710 watts into 4 ohms.
Load Impedance: Safe with all types of loads. Rated for 4 to 8 ohms in Stereo mode, 8 to 16 ohms in
Required AC Mains: 50 or 60 Hz; 100, 120, 200, 220 or 240 VAC (±10%). Both units draw 90 watts or less at idle. See Section 7 for detailed information on AC power draw, current draw and thermal dissipation.
It is extremely important to have adequate AC power for the amplifier. Power amplifiers cannot create energy— they must have the required voltage and current to de- liver the undistorted rated power you expect.
Controls
Enable: A front panel push button used to turn the ampli- fier on and off.
Level: A front panel rotary potentiometer for each channel with 31 detents used to control the output level.
Stereo/Mono: A
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