Benchmark Media Systems PRE420
4-Channel Mic Pre with Integrated Stereo Mix Bus and headphone monitoring
Benchmark Media Systems > Mic Pres, EQs & Dynamics > Mic Pre-Ampsฃ1,949.00
ฃ2,338.80 (inc 20% VAT)
Stock: 1-2 days
The Benchmark PRE420 is a four-channel microphone preamplifier with an integrated stereo mix bus and stereo/mono solo bus in a sleek, 1RU chassis. The PRE420 is designed for maximum transparency, wide bandwidth, low-noise, low-distortion, and superior RF immunity. It is well suited for the most demanding applications in studios and live venues.
Four Transformerless Microphone Inputs
Four Balanced Direct Outputs (XLR)
Balanced Left and Right Main Outputs (XLR)
Balanced Left and Right Control Room Outputs (XLR)
HPA2 0-Ohm 1/4 TRS Headphone Output
Precision-Matched Monolithic Low-Noise Transistor Quads on Each Microphone Input
CMF1 Common Mode RF Filter on Each Microphone Input
High-Current High-Speed Low-Capacitance Phantom Protection Circuits
Fully Protected Against Phantom Hot-Plug and Cable-Shorting Scenarios
Balanced Transformerless Inputs and Outputs
+48v Phantom Power Switch on Every Microphone Input
40 Hz High-Pass Filter Switch on Every Microphone Input (12 dB/octave)
20 dB Pad Switch on Every Microphone Input
Matched 41-Detent First-Stage Gain Controls on Every Microphone Input
60 dB Maximum First-Stage Gain, Adjustable to 70 dB
22 to 60 dB Gain (pad off), 2 to 40 dB (pad on)
+27 dBu Maximum Input Level (with pad), +7 dBu (without pad)
+29.5 dBu Maximum Output Level on all Balanced Outputs
+ 23.5 dBu Maximum Headphone Output Level
MirrorPan Low-Distortion Constant-Power Pan Controls (1 per input channel)
Solo Switches (1 per input channel)
Mono/Stereo Solo Switch for Flexible Monitoring
41-Detent Control Room/Headphone Level Control
41-Detent Main Output Level Control
Control Room Mute on Headphone Insertion Mode Switch (rear panel)
Intensity Modulated Signal Presence LEDs (Green - 4 on direct outputs plus 2 on main outputs)
+24 dBu Warning LED (Red 4 on direct outputs plus 2 on main outputs)
Solo Warning LED (Yellow)
+48V Phantom Warning Indicators (Yellow - 1 per input channel)
Power LED (Blue)
Ultra-Quiet Linear Power Supply with Rear-Panel Input Voltage Selector
Four Balanced Direct Outputs (XLR)
Balanced Left and Right Main Outputs (XLR)
Balanced Left and Right Control Room Outputs (XLR)
HPA2 0-Ohm 1/4 TRS Headphone Output
Precision-Matched Monolithic Low-Noise Transistor Quads on Each Microphone Input
CMF1 Common Mode RF Filter on Each Microphone Input
High-Current High-Speed Low-Capacitance Phantom Protection Circuits
Fully Protected Against Phantom Hot-Plug and Cable-Shorting Scenarios
Balanced Transformerless Inputs and Outputs
+48v Phantom Power Switch on Every Microphone Input
40 Hz High-Pass Filter Switch on Every Microphone Input (12 dB/octave)
20 dB Pad Switch on Every Microphone Input
Matched 41-Detent First-Stage Gain Controls on Every Microphone Input
60 dB Maximum First-Stage Gain, Adjustable to 70 dB
22 to 60 dB Gain (pad off), 2 to 40 dB (pad on)
+27 dBu Maximum Input Level (with pad), +7 dBu (without pad)
+29.5 dBu Maximum Output Level on all Balanced Outputs
+ 23.5 dBu Maximum Headphone Output Level
MirrorPan Low-Distortion Constant-Power Pan Controls (1 per input channel)
Solo Switches (1 per input channel)
Mono/Stereo Solo Switch for Flexible Monitoring
41-Detent Control Room/Headphone Level Control
41-Detent Main Output Level Control
Control Room Mute on Headphone Insertion Mode Switch (rear panel)
Intensity Modulated Signal Presence LEDs (Green - 4 on direct outputs plus 2 on main outputs)
+24 dBu Warning LED (Red 4 on direct outputs plus 2 on main outputs)
Solo Warning LED (Yellow)
+48V Phantom Warning Indicators (Yellow - 1 per input channel)
Power LED (Blue)
Ultra-Quiet Linear Power Supply with Rear-Panel Input Voltage Selector
Microphone Pre Amps
Number of Microphone Preamps: 4
Connectors: Gold-Pin Neutrik female XLR with direct ground feature
Grounding: Direct bonding of pin 1 to chassis
Input Impedance (pad off): 8.1k Ohms
Input Impedance (pad on): 1.37k Ohms
Gain Range (with pad off): 22 dB to 60 dB (to direct outputs)
Gain Range (with pad on): 2 dB to 40 dB (to direct outputs)
Maximum Input Level (pad off): +7 dBu (+4.8 dBV, 1.7 Vrms)
Maximum Input Level (pad on): +27 dBu (+24.8 dBV, 17.4 Vrms)
Phantom Power: +48V w/individual switches
High-Pass (rumble filter): 40 Hz second-order 12-dB/octave
RF Protection: CMF1 common-mode choke
Preamp Bandwidth: -0.02 dB at 10 Hz; -0.17 dB at 200 kHz; - 3 dB at 500 kHz
EIN at 60 dB Gain (20 Hz to 20 kHz) to any output -128 dBu at 150 Ohms; -131 dBu at 40 Ohms; -133 dBu at 0 Ohms
THD+N (1 kHz, BW=20 kHz, to any output at +27 dBu) -112 dB, 0.00024% at 22 dB Gain; -110 dB, 0.0003% at 35 dB Gain; -108 dB, 0.00038% at 40 dB Gain; -101 dB, 0.00085% at 55 dB Gain
IMD (50Hz and 7 kHz, to any output at +24 dBu) -104 dB, 0.0006% at 35 dB Gain; -104 dB, 0.0006% at 40 dB Gain
Direct Outputs
Number of Direct Outputs: 4
Connectors: Gold-Pin Neutrik male XLR with direct ground feature
Output Impedance: 60 Ohms Balanced, 30 Ohms Unbalanced (pin 3 floating)
Maximum Output Level without clipping: +29.5 dBu
Drive capability at rated THD+N: 300 Ohms
Output Type: Transformerless, Voltage and Impedance Balanced
Control Room and Main Outputs
Number of Outputs: 4, (2 control room + 2 main)
Connectors: Gold-Pin Neutrik male XLR with direct ground feature
Output Impedance: 60 Ohms Balanced, 30 Ohms Unbalanced (pin 3 floating)
Maximum Output Level without clipping: +29.5 dBu
Monitor Gain Control L/R Balance: +/- 0.01 dB at full clockwise rotation; +/- 0.3 db at middle of rotation
Drive capability at rated THD+N: 300 Ohms
Output Type: Transformerless, Voltage and Impedance Balanced
MirrorPan Constant-Power Pan Circuit
Number of pan controls: 4
Pan Law: 3-dB (constant power to stereo out)
Deviation from Constant Power: +/- 0.25 dB
Channel Separation when Fully Panned: > 71 dB
Balance at Center Detent: +/- 0.25 dB
THD+N: Better than -112 dB, 0.00024%
HPA2 Headphone Amplifier
Number of Outputs: 1
Connector: ผ TRS with switch contacts
Output Impedance: < 0.11 Ohms, 10 Hz to 200 kHz
Maximum Output Level at 0.001% THD+N: +23.5 dBu into 600 Ohms (0.24 W); +19.5 dBu into 30 Ohms (1.78 W)
Maximum Output Current: 250 mA
Overload Protection (independent per channel): Current limited at 300 mA Thermal Shutdown
Bandwidth: > 500 kHz; -0.014 dB at 10 Hz; -0.013 dB at 200 kHz
THD+N: -106 dB, 0.0005% into 30 Ohms at +18dBu (1.26 W)
LED Status Indicators and Meters
+48V Phantom Indicators: 4
Solo Warning Indicator: 1
Power Indicator: 1 Blue
Meter Indicators 6 Dual LED Meters
Meter Locations: 4 microphone inputs, 2 main outputs
Meter Specifications: Green LED intensity modulated signal presence, threshold = -8 dBu, full brightness at +24 dBu; Red LED threshold = +24 dBu adjustable, includes peak-responding pulse stretch circuit for viewing fast transients
AC Power Requirements
Input Operating Voltage Range (VAC RMS): 120 V setting: 105 V min, 140 V max; 220 V setting : 200 V min, 285 V max
Frequency 50-60 Hz
Power: 27 Watts Idle; 27 Watts Typical Program; 35 Watts Maximum
Fuses: 5 x 20 mm (2 required) 0.5 A 250 V Slo-Bloฎ; Littelfuseฎ HXP218.500 or Equivalent
Weight and Dimensions
Form Factor: 19 Rack Mount, 1 RU High
Depth behind front panel: 11.75 (298.5 mm)
Overall depth including knobs and connectors but without power cord: 12.625 (321 mm)
Width excluding 19 rack ears: 17.5 (445 mm)
Height excluding removable feet 1.725 (43.8 mm)
PRE420 only: 8.05 lb. (3.65 kg); PRE420 with power cord, extra fuses, and manual 9 lb. (4.1 kg)
Shipping weight 11 lb. (5 kg)
Number of Microphone Preamps: 4
Connectors: Gold-Pin Neutrik female XLR with direct ground feature
Grounding: Direct bonding of pin 1 to chassis
Input Impedance (pad off): 8.1k Ohms
Input Impedance (pad on): 1.37k Ohms
Gain Range (with pad off): 22 dB to 60 dB (to direct outputs)
Gain Range (with pad on): 2 dB to 40 dB (to direct outputs)
Maximum Input Level (pad off): +7 dBu (+4.8 dBV, 1.7 Vrms)
Maximum Input Level (pad on): +27 dBu (+24.8 dBV, 17.4 Vrms)
Phantom Power: +48V w/individual switches
High-Pass (rumble filter): 40 Hz second-order 12-dB/octave
RF Protection: CMF1 common-mode choke
Preamp Bandwidth: -0.02 dB at 10 Hz; -0.17 dB at 200 kHz; - 3 dB at 500 kHz
EIN at 60 dB Gain (20 Hz to 20 kHz) to any output -128 dBu at 150 Ohms; -131 dBu at 40 Ohms; -133 dBu at 0 Ohms
THD+N (1 kHz, BW=20 kHz, to any output at +27 dBu) -112 dB, 0.00024% at 22 dB Gain; -110 dB, 0.0003% at 35 dB Gain; -108 dB, 0.00038% at 40 dB Gain; -101 dB, 0.00085% at 55 dB Gain
IMD (50Hz and 7 kHz, to any output at +24 dBu) -104 dB, 0.0006% at 35 dB Gain; -104 dB, 0.0006% at 40 dB Gain
Direct Outputs
Number of Direct Outputs: 4
Connectors: Gold-Pin Neutrik male XLR with direct ground feature
Output Impedance: 60 Ohms Balanced, 30 Ohms Unbalanced (pin 3 floating)
Maximum Output Level without clipping: +29.5 dBu
Drive capability at rated THD+N: 300 Ohms
Output Type: Transformerless, Voltage and Impedance Balanced
Control Room and Main Outputs
Number of Outputs: 4, (2 control room + 2 main)
Connectors: Gold-Pin Neutrik male XLR with direct ground feature
Output Impedance: 60 Ohms Balanced, 30 Ohms Unbalanced (pin 3 floating)
Maximum Output Level without clipping: +29.5 dBu
Monitor Gain Control L/R Balance: +/- 0.01 dB at full clockwise rotation; +/- 0.3 db at middle of rotation
Drive capability at rated THD+N: 300 Ohms
Output Type: Transformerless, Voltage and Impedance Balanced
MirrorPan Constant-Power Pan Circuit
Number of pan controls: 4
Pan Law: 3-dB (constant power to stereo out)
Deviation from Constant Power: +/- 0.25 dB
Channel Separation when Fully Panned: > 71 dB
Balance at Center Detent: +/- 0.25 dB
THD+N: Better than -112 dB, 0.00024%
HPA2 Headphone Amplifier
Number of Outputs: 1
Connector: ผ TRS with switch contacts
Output Impedance: < 0.11 Ohms, 10 Hz to 200 kHz
Maximum Output Level at 0.001% THD+N: +23.5 dBu into 600 Ohms (0.24 W); +19.5 dBu into 30 Ohms (1.78 W)
Maximum Output Current: 250 mA
Overload Protection (independent per channel): Current limited at 300 mA Thermal Shutdown
Bandwidth: > 500 kHz; -0.014 dB at 10 Hz; -0.013 dB at 200 kHz
THD+N: -106 dB, 0.0005% into 30 Ohms at +18dBu (1.26 W)
LED Status Indicators and Meters
+48V Phantom Indicators: 4
Solo Warning Indicator: 1
Power Indicator: 1 Blue
Meter Indicators 6 Dual LED Meters
Meter Locations: 4 microphone inputs, 2 main outputs
Meter Specifications: Green LED intensity modulated signal presence, threshold = -8 dBu, full brightness at +24 dBu; Red LED threshold = +24 dBu adjustable, includes peak-responding pulse stretch circuit for viewing fast transients
AC Power Requirements
Input Operating Voltage Range (VAC RMS): 120 V setting: 105 V min, 140 V max; 220 V setting : 200 V min, 285 V max
Frequency 50-60 Hz
Power: 27 Watts Idle; 27 Watts Typical Program; 35 Watts Maximum
Fuses: 5 x 20 mm (2 required) 0.5 A 250 V Slo-Bloฎ; Littelfuseฎ HXP218.500 or Equivalent
Weight and Dimensions
Form Factor: 19 Rack Mount, 1 RU High
Depth behind front panel: 11.75 (298.5 mm)
Overall depth including knobs and connectors but without power cord: 12.625 (321 mm)
Width excluding 19 rack ears: 17.5 (445 mm)
Height excluding removable feet 1.725 (43.8 mm)
PRE420 only: 8.05 lb. (3.65 kg); PRE420 with power cord, extra fuses, and manual 9 lb. (4.1 kg)
Shipping weight 11 lb. (5 kg)
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