Crown 280A pojačalo
  • Crown 280A pojačalo
  • Crown 280A pojačalo

Crown 280A pojačalo

proizvođač: Crown

The Crown® 280A shall be an amplifier for commercial and industrial audio. It provides 4-ohm and constant-voltage outputs (70V and 100V). The 280A has 2 inputs and dual 80W power amplifi ers for two-zone systems.


cena: 923 $


Dodatna pitanja

info telefoni: 011/334-56-17, 011/3340-749, 063/586-473


Minimum guaranteed power into 4 ohms or 70V/100V
output80W maximum power at 1 kHz with 0.5% THD.
Frequency Reponse (at 1 watt from 4-ohm tap)70 Hz - 19 kHz +/– 1 dB.
Frequency Response (at line out)20 Hz to 20 kHz +/–1 dB.
Power Bandwidth (at 4-ohm tap, 2 dB below maxium 1kHz power)50 Hz to 20 kHz with < 0.5% THD.
Signal to Noise Ratio (ref. to rated power, master volume at minimum)85 dB.
DC Output Offset< ±5 mV.
THDLess than 0.5% at rated power at 1 kHz.
Input Sensitivity (for full output at maximum gain)800 mV.
Input Impedance (nominal)100 kilohms.
Minimum Load Impedance100V output 160 ohms
70V output 80 ohms
4-ohm output 4/8 ohms.
Crosstalk–70dB at 1kHz.
Line Output Level (nominal)1V into 10 kilohms.
AC Line Voltages Available100V 50/60 Hz
120V 60 Hz
220V 50/60 Hz
230V 50/60 Hz
240V 50/60 Hz.
Operating Temperature/Humidity0 degrees C to 40 degrees C at 95% relative humidity (non-condensing).
Storage Temperature–20 degrees C to 85 degrees C.


   Front Panel Controls and Indicators

·         Power Switch:  Pushbutton on-off switch.

·         Master Volume Controls:  One per output channel, detented potentiometer with knob.

·         Tone Controls:  Bass and Treble non-detented potentiometers on each channel, Bass ±10 dB at 100 Hz, Treble ±10 dB at 10 kHz.

·         Power Indicator:  Blue LED indicates power on.

·         Output Signal Presence Indicator:  Green LED, one for each input channel, illuminates when input signal exceeds 100 mV (45 dB below full power) from the 4-ohm tap.

·         Clip Indicators:  Red LED, one per output channel, illuminates at threshold of audible distortion.

      Rear Panel Controls and Connectors

·         Reset Button:  Resets the circuit breaker that protects the power supply; 220/230/240V units shall have a fuse instead.

·         AC Power Inlet:  Detachable IEC.

·         Auxiliary Power Input:  2-position terminal strip for 24 VDC (±10%) backup power; accepts up to 14 AWG terminal forks.

·         Amplifier Outputs Connectors:  One per channel, 4-position terminal strip with COM (Common), 4 ohms, 70V and 100V terminals; accepts up to 10 AWG terminal forks, non-touch cover included.

·         Output VCA Connector:  4-pin Phoenix-type connector for two VCA control lines of +10 VDC and ground; compatible with Crown 1-VCAP and 4-VCAP modules.

·         Line Out Connector:  One 3-pin balanced Phoenix-type connector per output channel, post master, pre-VCA, level controlled by master volume control.

·         Amp Input Connector:  3-pin Phoenix-type, high-impedance balanced, one per amplifer channel.


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