Crown Audio SR-I - Manual

Studio Reference
I
S T U D I O R E F E R E N C E S E R I E S
T T he stunning realism you will experience
when listening to a Crown
® Studio Refer-
ence™ amplifi er will redefi ne your expec-
tations. The evolution of this studio standard
ushers in a new era of powerful, ultraquiet
amplifi ers 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.
With the best transfer function in the industry,
ultra-high dynamic range and extraordinary
damping factor, your Studio Reference amplifi er
comes closer to the ideal “straight wire with
gain” than any other amplifi er. As you listen,
it will become apparent—the amplifi er’s low-
frequency transient response is the standard by
which all others must be judged.
Studio Reference amplifi ers integrate several
cutting edge technologies that make them the
most accurate reference amplifi ers available.
For example, in Stereo mode each channel
can actually be treated as a separate amplifi er
because of its separate high-voltage power sup-
plies and ultra-low crosstalk.
Crown’s unconventional Grounded Bridge™ cir-
cuitry delivers incredible voltage swings with-
out using stressful output transistor confi gu-
rations like other more traditional amplifi ers.
This results in signifi cantly lower distortion and
superior reliability.
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
website at www.crownaudio.com.
Specifi cations
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 specifi ed.
Power
Output Power: See power charts below.
Features
• Patented ODEP ® (Output Device Emulation
Protection) circuitry detects and compen-
sates for overheating and overload to keep
the amplifier working when others would
fail.
• IOC
®
(Input/Output Comparator) circuitry
immediately alerts you of any distortion that
exceeds 0.05% to provide dynamic proof of
distortion-free performance.
• PIP™ (Programmable Input Processor) con-
nector accepts accessories that tailor your
amplifi er to suit specifi c applications.
• Extremely wide dynamic range.
• 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 amplifi er the best transfer
function in the business.
• Two mono modes (Bridge-Mono and Parallel-
Mono) for driving a wide range of load imped-
ances.
• Custom-designed, tape-wound, low-noise
toroidal supplies with extremely high power
density.
Performance
Frequency Response: ±0.1 dB from 20 Hz to
20 kHz at 1watt.
Phase Response: +5 to –15 degrees from 20
Hz to 20 kHz at 1 watt.
Signal-to-Noise (A-weighted) below rated full
bandwidth power: Studio Reference I: 120 dB.
Studio Reference II: 117 dB.
Total Harmonic Distortion (THD): Less than
0.1% at full bandwidth power.
Intermodulation Distortion (IMD): (60 Hz and
7 kHz 4:1)
Studio Reference I: < 0.005% from full
bandwidth power to 78 watts, rising
linearly to 0.025% at 78 milliwatts.
Studio Reference II: < 0.005% from full
bandwidth power to 36 watts rising linearly
to 0.025% at 36 milliwatts.
Crosstalk (below rated full bandwidth power):
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.
Damping Factor: >20,000 from 10 Hz to 400
Hz.
Voltage Gain (at the maximum level setting):
Studio Reference I:
103:1 ± 6% or 40 dB ±0.5 dB at
0.775 volt sensitivity.
57:1 ± 6% or 35 dB ± 0.5 dB at
1.4 volt sensitivity.
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.
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.
AC Line Voltage and Frequency Confi gurations
Available (± 10%): 50 or 60 Hz; 100, 120, 200,
220 or 240VAC. Power draw at idle is 90 watts
or less.
Studio Reference
II
fi
8 ohm Bridge-Mono
*1 kHz
Power
2,220W
780W
1,160W
2,315W
1,580W
16 ohm Bridge-Mono
2 ohm Parallel-Mono
4 ohm Stereo (per channel)
8 ohm Stereo (per channel)
1,565W 4 ohm Parallel-Mono
Studio Reference I
*1 kHz Power: refers to maximum average power in watts
at 1 kHz with 0.05% THD.
8 ohm Bridge-Mono
*1 kHz
Power
1,100W
355W
555W
1,115W
715W
16 ohm Bridge-Mono
2 ohm Parallel-Mono
4 ohm Stereo (per channel)
8 ohm Stereo (per channel)
710W 4 ohm Parallel-Mono
Studio Reference II
*1 kHz Power: refers to maximum average power in watts
at 1 kHz with 0.05% THD.