PreSonus Studio Channel Tube Microphone Preamp

PreSonus Studio Channel Tube Microphone Preamp

More than just a mic preamp, the Studio Channel lends warm tube character to your tracks and helps shape your sound with a VCA compressor and three-band EQ.

PreSonus ADL600 Anthony DeMaria Labs Microphone Preamp

No longer available at zZounds
Big, warm, smooth, clear -- that's the sound of this 2-channel class A tube mic preamp, with 72 dB of gain, switchable impedance, instrument inputs and more.

The ADL 600 is a high voltage two-channel original microphone preamplifier designed by world-renown analog tube circuit designer Anthony DeMaria. The ADL 600 utilizes a unique high voltage, Class A discrete design with three vacuum tubes per channel for maximum headroom and tonality. The ADL 600 is built by hand in the USA by PreSonus and utilizes the finest components in the world including switched attenuators, military-grade vacuum tubes, analog VU and LED meters, custom-designed proprietary transformers, and the list goes on. No expenses are spared with the ADL 600 down to the last polypropylene film capacitor. The ADL 600 is big, warm, smooth, and clear; a sound like no other.

Control and Flexibility

The ADL 600 is designed for ultimate sonic performance, however its ease of use and flexibility allowing for many types of input sources further sets it above all other preamplifiers. The input selector allows for selection between Hi-Z instrument input, line input and four different microphone impedances for a wide variety of sounds and applications. The high pass filter is a rotary switch with three filter settings (40Hz, 80Hz, and 120Hz @ 6dB per octave) for passively and unobtrusively controlling room rumble and low frequency noise. The input gain attenuator is a military-grade rotary switch delivering 5dB step increments and a total preamplifier gain of over 72dB. The output stage is controlled by a fully variable conductive plastic attenuator delivering +/-10dB of read more fine tune trim adjustment to "dial-in" the perfect gain structure for the application at hand. The ADL 600 also includes 48V phantom power and a -20dB pad both controlled by big sturdy military grade switches.

Under the Hood

The ADL 600 is built with the finest components available in the world. The ADL 600 is a fully discrete transformer input and output Class A design incorporating three military-grade vacuum tubes per channel operating at voltages of +/-300V power rails for maximum tube tonality and headroom. There are no op-amps or integrated circuits (IC's) in the signal path to ensure the purest sound possible. The dual transformer design also ensures ultra low noise operation with maximum common mode rejection.


The ADL 600 is loaded with both fast-acting eight-segment LED meters for accurately detecting fast transients and peaks, as well as large high quality analog VU meters for metering output level.


The ADL 600 sets a standard in tonatily for tube preamplifiers. Vocals become big, smooth and articulate, bass guitars are deep and tight, and mixes become richer than ever. The ADL 600 is breathtaking both in terms of appearance and in sound performance. The ADL 600 delivers a sound like no other.


- High-voltage Class-A dual transformer design
- >73dB gain
- Selectable microphone input impedance
- Switched gain and variable fine trim controls
- Microphone, instrument and line inputs
- Ultra low noise (-100dB S/N ratio)
- Variable high pass filter, 48V, -20dB Pad, polarity invert
- Analog VU and fast-acting LED metering
read less

- Noise Floor (all inputs, minimum gain) -95dBu (A-weighted)
- Microphone Equivalent Input Noise (EIN) -125dBu (A-weighted)
- Frequency Response 10Hz to 45KHz +/- 1dB
- Maximum Output Level +23dBu (@ 0.5%THD+N)
- Output Impedance 600 Ohm
- Tube Complement (per channel) 1-12AT7A, 2-6922

Input Impedence:
- Microphone Selectable, 150/300/900/1500 Ohm
- Balanced Line 2KOhm
- Instrument 100KOhm

Maximum Input Level:
- Microphone (1500Ohm, +20dB Pad out) +5dBu
- Microphone (1500Ohm, +20dB Pad in) +25dBu
- Balanced Line +30dBu
- Instrument +30dBu

Gain Range:
- Microphone (1500Ohm, +20dB Pad out) 18dB to 72dB
- Balanced Line -12dB to 40dB
- Instrument -5dB to 42dB

- Power (Factory Configured) 115 or 230 VAC / 100Watts
- Dimensions 3.5" (H) X 17.0" (D) X 19.0" (W)
- Weight 28 lb

For support or warranty questions, please contact the manufacturer:
Phone: 225-216-7887

Reviewers gave this product an overall rating of 4.5 out of 5 stars. (18 ratings)
Submitted March 11, 2014 by Larry Hansen in Middlebury, CT
""Better Late Than Never""
Overall: 4.5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
It only took a few years before I finally pulled the trigger on this unit, ( I've done a lot of research and painstakingly tried a variety of pres) but, I'm glad I did! The unit arrived late this morning and I ran vocals and mic'd my acoustic guitar thru it this evening. Beautiful, warm tone..I couldn't be happier!I have a pair of Focusrite ISA One's that I dearly love and have used for quite some time ( I won't give 'em up). The ADL 600 just takes things to a different level and makes my sound a warmer and larger, especially if I do solo acoustic guitar.This unit is solid, heavy, powerful (like an old muscle car), but more importantly is the quality of sound it produces. I know some may think this pre is 'old-hat', but I know one thing. It sounds reaaally good. Isn't that what it's all about? Monet well spent! Period!It ain't cheap, but why settle for something less when it comes to making your music?
Musical Background:
Semi-pro acoustic guitarist for quite some time.
Musical Style:
Varies with the mood.
2 of 2 people (100%) people found this review helpful. Did you?
Thanks for your opinion!