The Presonus ADL 600 is a professional studio dual-channel tube mic preamp built without compromise. If you want to aspire to a preamp, here's your candidate!
Designed by famed tube-circuit designer Anthony DeMaria, the Presonus ADL 600 employs a distinctive Class A, discrete design with three military-grade vacuum tubes per channel, operating with ±300V power rails for maximum headroom and superb tone. The dual-transformer design also ensures low-noise operation, with maximum common-mode rejection.
Presonus has used only the finest components, including switched attenuators, analogue VU and LED meters, and custom-designed, proprietary transformers. There are no op-amps or ICs in the signal path. This preamp is pro quality all the way, right down to the last polypropylene film capacitor.
The result is an ultra-low-noise tube preamp with a big, warm, smooth, clear, distinctive sound. It produces big, smooth, and articulate vocals; deep and tight bass guitars; and rich, full mixes. It makes virtually anything you run through it sound better.
Beyond superb sound quality, the ADL 600 is special because of its ease of use and flexibility. Each of the two input channels has mic, line, and instrument inputs, and you can select among four mic-input impedances, so the preamp works great with any type of microphone. The high-pass filter employs a rotary switch with three filter settings (40 Hz, 80 Hz, and 120 Hz at 6 dB/octave) for controlling room rumble and low-frequency noise.
The input-gain attenuator is a military-grade rotary switch that provides 5 dB stepped increments and a total preamplifier gain of over 73 dB. The output stage is controlled by a fully variable attenuator that delivers ±10 dB of fine-tune trim adjustment, enabling you to dial in the perfect gain structure for any application. And of course, you get 48V phantom power and a 20 dB pad, controlled by big, sturdy, military-grade switches.
Fast-acting, eight-segment LED meters accurately detect fast transients and peaks. Large, backlit analog VU meters display output levels, and a -6 dB switch lets you meter particularly hot signals.
Features
- 2 input channels, each with:
- Mic, line, and instrument inputs
- High-voltage, Class A, dual-transformer, vacuum-tube preamp
- 3 military-grade vacuum tubes per channel
- Input-source select
- Variable mic-input impedance (150, 300, 900, 1,500Ω)
- Variable high-pass filter (40, 80, 120 Hz)
- 8-position Gain switch
- Variable Trim adjustment for final stage
- 48V phantom power
- -20 dB pad
- Polarity-reverse switch
- Backlit VU meter (output level) with -6 dB switch (for metering hot signals)
- 8-segment, fast-acting LED metering (peaks and transients)
- > 73 dB of gain
- Input/Output
- 2 unbalanced ¼” instrument inputs (front panel)
- 2 transformer-balanced XLR line inputs
- 2 transformer-balanced XLR mic inputs
- 2 transformer-balanced XLR line outputs
- Physical
- 2U 19” rack-mountable, rugged steel chassis
- Internal power supply with standard IEC connector
- Chassis ground link connectors (lift chassis ground)
