Crown Audio PSA-2 User's Manual
Contents
1. Required AC Mains 50 400 Hz AC with selectable transformer taps for 100 120 200 220 and 240 V 10 operation AC Line Connector Standard three wire grounded connector Controls Power A two position rotary switch located on the front panel turns the amplifier on and off Level A signal level control for each channel located on the front panel Stereo Mono A two position switch located on the back panel selects between Stereo and Bridge Mono modes of operation Low Freq Protect A two position switch located on the back panel activates subsonic protection circuitry Delay A two position switch located on the back panel activates a 4 second turn on delay to protect loudspeakers from unwanted transients Indicators On An amber indicator which shows the unit has been turned on Standby Normally off these yellow indicators turn on if a channel is placed in STANDBY mode Signal These green indicators flash synchro nously with the input signal to show its presence 10C Normally off these red indicators flash in the rare event the output waveform differs from that of the input by 0 05 or more Input Output Input Connector Unbalanced 4 inch phone jack for each channel Input Impedance Nominally 25 K ohms Input Sensitivity 2 1 V for rated power into 8 ohms Output Connector Color coded binding posts banana jacks Output Impedance lt 12 milliohms in series with lt 1 2 microhenri2. age power per channel is reported 3 Asingle cycle of sine wave is presented to the amplifier and monitored for non linear distortion The average power during the burst is reported Speakers must be able to withstand this level if they are to be safely used with this amplifier 4 A 40 millisecond burst or two cycles of sine wave whichever is of greater duration is used and the power computed as the average power during the burst The duty cycle of this test is 10 percent This power level is a measure of how loud an amplifier is as percieved by the hearing process 5 EIA standard RS 490 both channels driven Architect s Specifications The power amplifier being of two channels shall deliver a minimum of 265 watts into 8 ohms with both channels operating or 380 watts into loads of 4 ohms each with both channels operating When strapped into mono it shall be capable of delivering 520 watts into a 16 ohm load or 760 watts into 8 ohm loads The amplifiers outputs shall have internal protection against possible shorted mismatched and open circuits The circuitry shall incorporate voltage amplifiers whose slew rate is controlled to protect the overall amplifier whose slew rate is controlled to protect the overall amplifier against RF burnout The power amplifier shall provide in stereo mode operation a voltage gain of 20 2 or 26 2 dB at maximum gain have an input sensitivity of 2 1 volts 220 watts into 8 ohms and be capable of d
3. es Chassis Ground Two terminal barrier block with Shorting strap Accessory Rear internal plug accepts optional input modules Continued on back page 120 50 60 Hz 2400 WATTS j ALL PATENT RIGHTS RESERVED Ko CLEAN FAN FILTER PERIODICALLY WITH SOAP AND WATER AUTION TO PREVENT ELECTRIC SHOCK DO NOT OPEN NO USER SERVICE ABLE PARTS INSIDE REFER SERVICING TO QUALIFIED TECHNICIANS ATTENTION A FIN DE PRE VENIR UN CHOC ELECTRIQUE OUVER E CLE ARRIERE S ADRESSER A UN REPARATEUR COMPETENT CLASS 1 REQUIRED WHEN OUTPUT WIRING IS INSTALLED IN BUILDING WALLS AC LINE AND MATERIALS FTC Continuous Average Power at 0 1 THD See note 1 Configuration amp Load ohms both channels powered Bridge Mono balanced output Specifications continued Construction All aluminum construction for maximum heat conduction and minimum weight with specially designed flow through ventilation top front and side panels Satinized aluminum front panel with grey suede Lexan insert and black painted aluminum chassis covers Dimensions 19 in 48 3 cm wide 7 in 17 8 cm tall 14 75 in 37 5 cm deep behind front mounting surface Weight 57 Ibs 25 9 kg Mounting Standard EIA 310 front panel rack mounting Please contact a Crown representative for full details Optional Balanced Input Specifications Controls Channel 1 and Channel 2 input gain adjust with the AGC Thresho
4. ld is accessible from the rear of the Balanced Input Module Hum and Noise 85 dB equivalent input noise 20 kHz and 15 kHz 600 ohm source gain set at unity Frequency Response Flat 2 dB 20Hz to 20 kHz High and Low Pass Filters 3 pole Butterworth 18 dB octave 50 Hz and 15 kHz standard frequencies Compressor Action Range of compression restricted to 13 dB by design wider range would aggravate feedback in live performance Threshold adjustable from overload level of main amplifier to 12 dB lower Balanced Input Voltage Gain Variable 0 10 0 20 dB Test Tone Switch activated wide spectrum 50 pulses per second Common Mode Rejections 70 dB 5 Hz to 3 kHz 55 dB 20 kHz Max Average Power at 0 1 THD See note 2 1 kHz PSA 2 SELF ANALYZING AMPLIFIEF INPUTS CH2 CH1 PS A 2 BALANCED INPUT MODULE MONO STEREO MONO ites OFF LOW FREQ est BALAN PROTECT FN INPUT b J CH 2 BALANCED NPUT 40 mS Tone Burst Watts at lt 0 05 THD See note 4 1 Cycle Tone Burst Watts at lt 0 05 THD See note 3 1 kHz EIA Watts at 1 THD See note 5 Crown s 3 Year No Fault Amplifier Warranty And 3 3 No Fault Extended Warranty Crown International now offers a 3 Year No Fault Warranty for every new Crown amplifier an industry standard With this unprecedented No Fault protection your new Crown amplifier is warranted to meet or exceed original specifications for the first three years of ownershi
5. p During this time if your amplifier fails for any reason or does not perform to original specifications it will be repaired or replaced at our expense This includes parts labor and round trip shipping even a shipping carton should you need one About the only things not covered by this warranty are those losses normally covered by insurance and intentional abuse And the coverage is transferable should you ever decide to sell your amp That s not all for a modest fee Crown will extend that protection for an addi tional three years with our 3 3 No Fault Extended Warranty Now that s commit ment See your Crown dealer for full war ranty disclosure and details on the No Fault and 3 3 No Fault Extended Warranty 1990 Crown International Inc e Crown International Inc reserves the right to make changes in specifications or products without prior notice Crown IOC and Multi Mode are registered trademarks of Crown International Inc 1 Continuous power in the context of Federal Trade Commis sion testing is understood to be a minimum of five minutes of operation Harmonic distortion is measured as the RMS sum total as a percentage of the fundamental output voltage This distortion specification applies for all wattages greater than 0 25 watts 2 A 1 kHz sine wave is presented to the amplifier and the output monitored for non linear distortion The level is increased until the THD reaches 0 1 At this level the aver
6. riving any load safely including completely reactive loads Hum and noise shall be 115 dB below rated output from 20 Hz to 20 kHz Intermodulation distortion shall be less than 0 01 from 0 25 watts to 265 watts into 8 ohms per channel The dimensions shall allow for standard 19 48 26 cm EIA rack mounting It shall be 7 17 78 cm high and 143 4 37 46 cm deep from the mounting surface It shall weigh 57 pounds 25 9 Kg net The power requirements shall be 50 400 Hz AC with adjustable taps for 100 to 240 V 10 At idle the amplifier shall draw 90 watts or less The amplifier Shall be aclass AB and be of frequency response 1 dB from 20 Hz to 20 kHz at 1 watt into 8 ohms The power amplifier shall be a Crown PSA 2 crown Made in U S A Exported as Amcron P O Box 1000 Elkhart Indiana 46515 1000 TEL 219 294 8000 FAX 219 294 8329 Crown Division 219 294 8346 Amcron Division TWX 810 294 2160 K 1071 8 ee h hl i ikelhmhmhr hh hhh
7. rown has proven throughout the years to be a company that top sound profession als rely and stake their reputations on The PSA 2 a high technology stereo amplifer is another example of Crown s dedication to providing pure sonic quality and indestructibility for professional sound rein forcement This premium Crown amplifier can deliver an unprecedented 915 watts in bridged mono mode into 8 ohms at 0 1 THD Stereo power is over 460 watts per channel into 4 ohms or 275 watts into 8 ohms The PSA 2 delivers highly reliable clean power to a demanding market Patented Crown circuitry allows extreme voltage swings without putting output transis tors in series thus lower distortion and greater reliability The Output Device Emulator Protec tion circuit ODEP simulates the output transistors and detects and compensates for overheating and overload The efficient heat sinking and forced air cooling system prevent overheating to protect your investment A two position switch selects stereo or parallel mono modes Legendary Crown performance reaches to new peaks the PSA 2 PPRS ae spe pessoa T e A GSI Specifications Feature Summary Ultimate Protection On board analog computers compare the operating condition of the output transistors to their safe operating area SOA and limit the drive level to them if their SOA is exceeded Distortion Indicator Advanced IOC Input Output Comparator alerts the user in the
8. unlikely event that distortion of any kind exceeds 0 05 Exceptionally Low Distortion Advanced Multi mode AB B design results in exceptionally low distortion Bridge Mono Mode Bridge Mono mode is provided for double output voltage Efficient Cooling Two speed forced air cooling with high efficiency coolers prolong component life No Fault Warranty A 3 year standard No Fault warranty which may be extended for an additional three years Includes round trip shipping Performance Note The following performance measurements were made in Stereo mode with both channels driven into an 8 ohm load Frequency Response 0 1 dB from 20 Hz to 20 kHz at 1 watt 0 1 5 dB from DC 0 Hz to 80 kHz Phase Response 0 15 from DC 0 Hz to 20 kHz at 1 watt Signal to Noise Ratio 115 dB A weighted at full output Total Harmonic Distortion THD lt 0 002 from 20 Hz to 1 kHz and increasing linearly to 0 05 at 20 kHz at 220 W Intermodulation Distortion IMD lt 0 01 from 0 25 W to 220 W Slew Rate gt 30 V per microsecond Damping Factor gt 700 from DC 0 Hz to 400 Hz Power Output Power Note Maximum average power at 1 kHz with 0 1 THD Stereo 700 W per channel into 2 ohms 460 W into 4 ohms 275 W into 8 ohms Bridge Mono 915 W into 8 ohms ABLE ZING g4 acrown SIOA T e oA Load Impedance Rated for 16 8 4 2 ohm use Safe with all types of loads even reactive ones
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