Crown Audio Stereo Amplifier PT 21 User Manual

P O W E R - T E C H S E R I E S  
PT 2.1  
t’s hard to please every crowd. But you’ll  
have a better chance when you use a Crown  
Features  
I
Power-Tech .1 Series amplifier. Musicians  
and DJs alike demand a lot from their sys-  
tems—clean, punchy sound; reliability; rug-  
gedness; smaller size; less weight—all at a  
reasonable price. And Crown PT .1s bring  
these benefits and much more to the table.  
That’s because at Crown, we’ve built our repu-  
tation around legendary sound and support.  
Rugged, professional power amplifier built  
for the road.  
clean, accurate low end.  
Bridge-Mono and Parallel-Mono modes make  
it easy to optimize the amplifiers perfor-  
mance for a wide range of loads.  
Quick-access front panel power switch and  
level controls. Turn-on delay for loudspeaker  
protection.  
Balanced phone jack inputs in parallel with  
XLR input connectors.  
Patented ODEP ® circuitry and Grounded  
Bridgedesign combine to provide perfor-  
mance and reliability that surpass traditional  
designs.  
Complete protection against shorted outputs,  
mismatched loads, overheating, input/output  
DC and high-frequency overload; full internal  
fault protection.  
Power-Tech .1 Series amplifiers are compact,  
professional stereo power amplifiers engi-  
neered to meet the most demanding sound  
reinforcement needs. They compare very  
favorably to more expensive amplifiers, pro-  
viding uncolored sound and signal-to-noise  
ratios commonly associated with recording  
studios. Plus, every Power-Tech .1 amplifier is  
backed by Crown’s unequaled Three-Year, No-  
Fault, fully-transferrable warranty that covers  
everything.  
Easy to read signal presence (SPI) and distor-  
tion (IOC ®) indicator for each channel.  
Three-year, No-Fault, fully-transferrable  
warranty completely protects your investment  
and guarantees its specications.  
High damping factor provides superior  
control over low-frequency drivers for a  
Intermodulation Distortion (IMD): (60 Hz and 7  
kHz 4:1) Less than 0.05% from less than 171  
milliwatts to full bandwidth power.  
Load Impedance: Safe with all types of loads.  
Rated for 4 to 8 ohms in Stereo, 8 to 16 ohms  
in Bridge-Mono and 2 to 4 ohms in Parallel-  
Mono mode.  
With over five decades of experience designing  
and building rock-solid products, Crown is the  
standard in amp technology. So check out the  
affordable, “all-Crown” Power-Tech .1. They  
are a powerful argument for quality and value!  
Damping Factor: Greater than 1,000 from 10  
Hz to 400 Hz.  
Required AC Mains: Power requirements are  
provided on each units back panel. 120 VAC,  
60 Hz and 100/120/220/240 VAC, 50 to 60  
Hz (non-convertible) units are available. Rated  
AC mains voltages are 10%. Quiescent power  
draw is 90 watts or less. 100 and 120 VAC units  
draw up to 10 amps of current; 220 and 240  
VAC units draw up to 5 amps.  
Crosstalk: Greater than 90 dB below full band-  
width power from 50 Hz to 2 kHz, rising linearly  
to greater than 66 dB at 20 kHz.  
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Seriieess,, ccoonnttaacctt tthhee CCrroowwnn TTeecchhnniiccaall SSuuppppoorrtt  
Grouupp aatt 800-342-6939 or 219-294-8200.  
Also, visit the Crown Audio website at  
Controlled Slew Rate: Greater than 13  
volts/ms.  
Voltage Gain: 66:1 6% or 36 dB 0.5 dB at  
0.775-volt sensitivity; 36:1 6% or 31 dB 0.5  
dB at 1.4-volt sensitivity; 20:1 6% or 26 dB  
0.5 dB at the maximum level setting.  
Low-Voltage Power Supply: A 24 VDC fan-  
former supply (fan motor winding) regulated to  
15 VDC.  
Specications  
The following applies to units in Stereo mode with 8-ohm loads  
and an input sensitivity of 26 dB unless otherwise specied.  
AC Connector: An appropriate AC line cord and  
plug are provided. North American units have  
a standard 3-wire, 15-amp grounded connector  
(NEMA 5-15P).  
120 VAC, 60 Hz Units: refers to ampliers with dedicated  
Power  
Output Power:  
transformers for 120 VAC, 60 Hz power mains.  
International Units: refers to ampliers with special multi-tap  
transformers that make them congurable for several AC  
mains voltages and line frequencies.  
Controls  
Performance  
Frequency Response: 0.1 dB from 20 Hz to  
20 kHz at 1 watt.  
Power: A front panel push button switch used  
to turn the amplier on and off. It is also a  
circuit breaker for the power supply.  
Phase Response: 10 degrees from 10 Hz to  
20 kHz at 1 watt.  
Level: A front panel rotary potentiometer for  
each channel used to control the output level.  
Signal-to-Noise: A-weighted, better than 105  
dB below full bandwidth power. Better than 100  
dB below full bandwidth power from 20 Hz to  
20 kHz.  
Stereo/Mono: A three-position back panel  
switch used to select Stereo, Bridge-Mono or  
Parallel-Mono mode.  
Sensitivity: A three-position switch behind the  
input module used to select the input sensitivity  
for both channels: 0.775 volts or 1.4 volts for  
standard 1 kHz power, or 26 dB voltage gain.  
Total Harmonic Distortion (THD): Less than  
0.05% at full bandwidth power from 20 Hz to 1  
kHz increasing linearly to 0.1% at 20 kHz.  
 

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