Crown Audio Stereo Amplifier SR I User Manual

S T U D I O R E F E R E N C E S E R I E S  
Studio Reference I  
Studio Reference II  
he stunning realism you will experience  
when listening to a Crown® Studio Refer-  
T
ence™ amplifier will redefine your expec-  
tations. The evolution of this studio standard  
ushers in a new era of powerful, ultraquiet  
amplifiers capable of faithfully reproducing  
the most demanding of signals. This kind of  
sonic integrity does not happen accidentally.  
It demands the leadership and technical excel-  
lence for which Crown has long been known.  
Features  
With the best transfer function in the industry,  
ultra-high dynamic range and extraordinary  
damping factor, your Studio Reference amplifier  
comes closer to the ideal “straight wire with  
gain” than any other amplifier. As you listen,  
it will become apparent—the amplifier’s low-  
frequency transient response is the standard by  
which all others must be judged.  
Patented ODEP® (Output Device Emulation  
Protection) circuitry detects and compen-  
sates for overheating and overload to keep  
the amplifier working when others would  
fail.  
Ultra-high damping factor delivers superior  
loudspeaker motion control for the cleanest,  
tightest bottom end you’ve ever felt—or  
heard.  
Super-low harmonic and intermodulation  
distortion give your amplifier the best transfer  
function in the business.  
IOC® (Input/Output Comparator) circuitry  
immediately alerts you of any distortion that  
exceeds 0.05% to provide dynamic proof of  
distortion-free performance.  
Studio Reference amplifiers integrate several  
cutting edge technologies that make them the  
most accurate reference amplifiers available.  
For example, in Stereo mode each channel  
can actually be treated as a separate amplifier  
because of its separate high-voltage power sup-  
plies and ultra-low crosstalk.  
Two mono modes (Bridge-Mono and Parallel-  
Mono) for driving a wide range of load imped-  
ances.  
PIP™ (Programmable Input Processor) con-  
nector accepts accessories that tailor your  
amplifier to suit specific applications.  
Custom-designed, tape-wound, low-noise  
toroidal supplies with extremely high power  
density.  
• Extremely wide dynamic range.  
Crown’s unconventional Grounded Bridge™ cir-  
cuitry delivers incredible voltage swings with-  
out using stressful output transistor configu-  
rations like other more traditional amplifiers.  
This results in significantly lower distortion and  
superior reliability.  
Studio Reference II: < 0.005% from full  
bandwidth power to 36 watts rising linearly  
to 0.025% at 36 milliwatts.  
Performance  
Frequency Response: 0.1 dB from 20 Hz to  
20 kHz at 1watt.  
Crosstalk (below rated full bandwidth power):  
Phase Response: +5 to –15 degrees from 20  
Hz to 20 kHz at 1 watt.  
For more details about the Studio Reference I  
and Studio Reference II, contact the Crown  
Technical Support Group at 800-342-6939 or  
574-294-8200. Also, visit the Crown Audio  
Studio Reference I: >100 dB from 20  
Hz to 400 Hz and >70 dB at 20 kHz.  
Studio Reference II: >100 dB from 20 Hz  
to 400 Hz and >65 dB at 20 kHz.  
Signal-to-Noise (A-weighted) below rated full  
bandwidth power: Studio Reference I: 120 dB.  
Studio Reference II: 117 dB.  
Damping Factor: >20,000 from 10 Hz to 400  
Hz.  
Total Harmonic Distortion (THD): Less than  
0.1% at full bandwidth power.  
Specifications  
Voltage Gain (at the maximum level setting):  
Intermodulation Distortion (IMD): (60 Hz and  
7 kHz 4:1)  
The following apply to units in dual mode with both channels  
driven into 8 ohm loads and an input sensitivity of 26 dB gain  
unless otherwise specified.  
Studio Reference I:  
103:1 6% or 40 dB 0.5 dB at  
0.775 volt sensitivity.  
Studio Reference I: < 0.005% from full  
bandwidth power to 78 watts, rising  
linearly to 0.025% at 78 milliwatts.  
Power  
57:1 6% or 35 dB 0.5 dB at  
1.4 volt sensitivity.  
Output Power: See power charts below.  
20:1 6% at 26 dB gain 0.5 dB.  
Studio Reference II:  
69:1 6% or 37 dB 0.5 dB at  
0.775 volt sensitivity.  
38:1 6% or 32 dB 0.5 dB at  
1.4 volt sensitivity.  
*1 kHz  
Studio Reference I  
Power  
*1 kHz  
Power  
Studio Reference II  
4 ohm Stereo (per channel)  
8 ohm Stereo (per channel)  
8 ohm Bridge-Mono  
1,160W  
780W  
2,220W  
1,580W  
2,315W  
555W  
355W  
1,100W  
715W  
4 ohm Stereo (per channel)  
8 ohm Stereo (per channel)  
8 ohm Bridge-Mono  
20:1 6% at 26 dB gain 0.5 dB  
Load Impedance: Safe with all types of loads.  
4-8 ohms in Stereo mode, 8-16 ohms in  
Bridge-mono mode, and 2-4 ohms in Parallel-  
Mono mode.  
16 ohm Bridge-Mono  
2 ohm Parallel-Mono  
16 ohm Bridge-Mono  
2 ohm Parallel-Mono  
1,115W  
AC Line Voltage and Frequency Configurations  
Available ( 10%): 50 or 60 Hz; 100, 120, 200,  
220 or 240VAC. Power draw at idle is 90 watts  
or less.  
1,565W  
710W  
4 ohm Parallel-Mono  
*1 kHz Power: refers to maximum average power in watts  
at 1 kHz with 0.05% THD.  
4 ohm Parallel-Mono  
*1 kHz Power: refers to maximum average power in watts  
at 1 kHz with 0.05% THD.  
 

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