The dbx 540 is a single-slot 500-series tube microphone preamp that boasts pristine audio output, superior-quality high-end design at a value price.
The dbx 540 features a Class A tube preamplifier, switchable phantom power, phase invert, selectable -20dB pad, and a super fast in-line optical compressor. The front panel includes a TRS microphone input-a standout feature typically not found on 500-series preamps.
The easy-access interchangeable 12AX7 preamp tube allows you to experiment with a variety modern and vintage tubes to customize the 540's sound and performance to your taste. The switchable (in/out) compressor provides adjustable attack and release, and when it's in use, the on-board VU meter automatically changes from displaying master level to amount of gain reduction, so you can view the exact results of the compression being applied. Editing is done using our smooth, responsive hand-machined controls. And last but not least: The dbx 540's audio circuit uses LME49720 ultra-low distortion/low noise Op Amps, for superb audio output.
Suitable for use in all 500-series-compatible systems
12AX7 electron tube
Class A transformless high voltage signal path
Adjustable optical compressor
Switchable phantom power
Switchable phase invert
Switchable -20dB pad
Dual-function VU meter: master volume / gain reduction
Input gain control
Output volume control
Mic/Line Input Connectors : TRS balanced
Impedance : 3k Ohms
Mic Input Gain : 10dB to 60dB
Phase Reversal : Switchable
Phantom Power : +48V, switchable
Instrument Input Connector : 1/4" jack unbalanced (or XLR from back panel)
Instrument Input Gain : 0dB to 45dB
Output Connectors : XLR & 1/4" jack (back panel)
Line in Frequency Response : 10Hz to 40kHz within 1dB
Mic in Frequency Response : 10Hz to 40kHz within 2.5dB