Presonus ADL 700 Tube-Driven Channel Strip

Short Description:

A single-channel version of the award-winning ADL 600 Class A tube preamplifier with a full-featured FET compressor/limiter, and a 4-band semi-parametric EQ. In Used, Excellent condition

What We Think:

When PreSonus teamed up with legendary tube designer Anthony DeMaria (of Anthony DeMaria Labs) to create the ADL 700, they set out to build an uncompromised, flagship Class-A channel strip for world-class recording chains. Combining a high-voltage tube preamplifier with a custom FET compressor and a 4-band semi-parametric EQ, the ADL 700 delivers ultra-luxurious, three-dimensional analog tone with massive headroom.

At the heart of the ADL 700 is a dual-vacuum-tube preamp running on a high-voltage +300V power rail. This design provides an incredibly open, warm, and detailed tone with dual transformer-balanced operation for rich harmonic depth. Whether you are tracking pristine lead vocals, acoustic guitars, or gain-hungry ribbon mics, the variable input impedance control lets you load dynamic and ribbon capsules to unlock different tonal textures directly at the front end.

The onboard dynamic shaping and EQ sections make the ADL 700 a true single-box channel solution. The FET compressor delivers fast, punchy transient control modeled after classic FET designs—perfect for smoothing out dynamic vocals or locking down bass tracks. Following the compressor is a musical 4-band semi-parametric EQ with switchable shelving/peak filters, allowing you to sculpt air, presence, and weight without introducing phase harshness.

Manufacturer Description:

PreSonus is proud to announce the ADL 700 channel strip, which combines a high-end, Class A tube preamplifier with a fully variable, FET-based compressor and a four-band semi-parametric equalizer. The new channel strip provides separate balanced XLR mic, balanced XLR line, and ¼” TS instrument inputs and a single balanced XLR output.   The Preamp The ADL 700 incorporates a single-channel version of the award-winning PreSonus ADL 600 two-channel tube preamplifier, which was codesigned with famed tube-circuit designer Anthony DeMaria. PreSonus and DeMaria teamed up to create a distinctive Class A, discrete design that employs one 12AT7 and two 6922 vacuum tubes per channel, operating with ±300V power rails for maximum headroom and superb tone. The dual-transformer design ensures low-noise operation, with maximum common-mode rejection. This results in an ultra-low-noise tube preamp with a big, warm, smooth, clear, distinctive sound.   Among the hallmark features of ADL-series preamps is an Input Source Select switch with variable mic-input impedance. This switch enables you to choose among signal sources and patches the selected input through the signal chain, completely bypassing the other two inputs. It also provides a choice of four mic-input impedances: 1500Ω, 900Ω, 300Ω, and 150Ω. Lowering or raising the ADL 700 mic-input impedance can create subtle coloring and filtering effects, enabling you to get a wider variety of tonalities without using the EQ.    Of course, the preamp offers 48V phantom power, polarity reverse, and a -20 dB pad. In addition, it provides variable mic-input gain, employing an 8-position rotary switch that provides 35 dB of gain in 5 dB increments. A Trim potentiometer (±30 dB) allows you to make fine adjustments to the final preamp stage of the ADL 700 input. You also get a -12 dB/octave high-pass filter whose frequency threshold can be set at 20 Hz, 40 Hz, 80 Hz, or 200 Hz, or it can be turned off completely.   The Compressor The ADL 700’s FET-based compressor and semi-parametric EQ were custom-designed by Robert Creel, the mastermind behind many of PreSonus’ most beloved analog circuits, including the XMAX™ preamp. FET (Field-Effect Transistor) compressors use transistors to emulate a triode-tube sound. This type of compressor generally provides a faster attack time and better repeatability than the optical compressors that are more commonly found in channel strips in this price class.    The ADL 700 compressor features include fully variable attack, release, threshold, ratio, makeup gain, and bypass. When Threshold is turned fully counterclockwise to the ST position, the onboard compressor controls are bypassed, and compression is controlled externally via a Stereo Link connection to a second ADL 700.   The EQ The 4-band semi-parametric EQ was designed with musicality in mind, combining isolated filters and optimized, per-band Q to provide subtler signal shaping without harsh artifacts. All bands have Gain (±16 dB) and Frequency controls, with overlapping frequency ranges and fixed Q (0.6). The low and high bands are switchable between shelving and peak. Dual-mode analog VU metering enables monitoring of output and gain-reduction levels. A -6 dB switch offsets the meter for use with hot source signals. A master level control adjusts the overall output from -80 to +6 dB.    The Jist With its extensive feature set, ultra-low noise (-100 dB S/N ratio), >73 dB gain, extended frequency response of 10 Hz to 45 kHz, and top-of-the-line sound, the ADL 700 is a superb creative tool for serious recording engineers and musicians. 

Specifications:

• High-voltage, all-tube, Class A, dual-transformer design with one 12AT7 and two 6922 vacuum tubes

• Fully variable FET compressor with attack, release, threshold, ratio, makeup gain, and stereo link

• Four-band, semi-parametric EQ

• Variable high-pass filter

• Selectable microphone input impedance

• Switched Gain and variable Fine Trim controls

• Microphone, instrument, and line inputs with Source Select

• Ultra-low noise (-100 dB S/N ratio) and high gain (>73 dB gain)

• 48V phantom power, polarity invert, and -20 dB pad

• Dual-mode analog VU metering (output and gain reduction)

• 2U rack-mount