Altair II Pre-Amplifier

Altair II Pre-Amplifier

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Sound Quality

Consider Altair II a collaborative effort. It began with the original Altair, created by Constellation Audio's "dream team" of the world's best audio engineers and industrial designers. Our engineers then refined these original concepts using feedback from our dealers and customers. The result is a product with a more user-friendly interface, yet that retains the same sound quality as the original Altair, acclaimed by a leading audio magazine as setting a new standard "in virtually every sonic and musical criterion."

Precision & Dynamics

With its innovative circuitry and incomparable build quality, Altair II achieves something no other preamp can: the musicality of classic tube preamps with precision and dynamics matched by no other solid-state preamp. Only upon hearing the Altair II can one appreciate the musical experience it delivers

Line Stage Gain Module

We build the Line Stage Gain Module's balanced circuit from two mirror-imaged amplifiers, one for the positive half of the signal and the other for the negative half. Through the use of hand-matched, ultra-low-noise FETs and servo circuits, our engineers have achieved an essentially perfect balance between the positive and negative halves of the audio signal.

Fully Balanced Circuitry

Because the Line Stage Gain Module's circuit is fully complementary, comprising two identical circuits, it automatically cancels incoming noise and interference while increasing slew rate and frequency response. As a result, Altair II achieves an extraordinary 200-kilohertz bandwidth.

Simple, Elegant Remote Control

The new machined aluminum infrared remote control provides a gratifying, friendly interface with Altair II. The remote's soft leather cladding feels comfortable in the hand, and also provides a slip-resistant grip. All of Altair II's most commonly used functions can be controlled from the remote.

User-Friendly Front Touchscreen

Altair II's front touchscreen accesses all of the preamp's advanced functions, including input configuration and all other setup parameters. Large, high-contrast fonts allow the display to be read from across a room.

Incomparable Mechanical Isolation

Altair II's audio circuits are double-isolated from vibration. Each Line Stage Gain Module is mounted on a sandwich of an isolating polymer layer between two stainless steel sheets. An elastomeric suspension in turn supports this platform. Highly flexible, custom-made wiring prevents any vibration on the chassis from reaching the "floated" circuit boards. The sheer mass of the Altair II chassis and internal assembly also helps damp vibration.

Home Theater Bypass Mode

Through the front touchscreen, one of Altair II's inputs may be configured for home theater bypass. This mode allows the left and right channels from a surround-sound processor to pass through Altair II, permitting the same left/right speakers and amplifiers to be used for two-channel or multichannel reproduction without having to make volume adjustments. Switching to any other input restores two-channel sound.

Nearly Impermeable Shielding

Key circuit modules inside Altair II are isolated from the others to reduce interference to the lowest possible levels. A machined aluminum shield protects each individual Line Stage Gain Module, while formed aluminum enclosures shield the control circuits. The thick walls of the machined aluminum chassis provide additional shielding against outside interference.

Machined Solid Aluminum Chassis

In order to block 50/60 Hertz electromagnetic interference from household circuits, we encase Altair II's inner workings in an enclosure machined from solid billets of aluminum to a minimum wall thickness of 8.2mm. These thick walls cannot resonate or vibrate as a sheet metal enclosure can.

Constellation Direct Balanced Interface

Owners of Constellation Audio's Hercules and Centaur amplifiers can experience an even higher level of quality from Altair II through our Constellation Direct interface, which bypasses the input module of the amplifiers to reduce the number of gain stages in the signal chain. This reduces noise and improves reproduction of musical detail.

Triple-Transformer Power Supply

Altair II's power supply incorporates three separate R-core transformers, one for left channel analog audio, one for right channel analog audio, and one for control circuitry. The power supply's machined aluminum enclosure shields the audio section of Altair II from the transformers' electromagnetic energy. Custom-extruded PCOCC cables tipped with aerospace-type Hypertronics connectors carry the separate the three separate power feeds to the Altair II main chassis.

Optically Controlled Resistors for Volume Control

An array of 48 optically controlled resistors provides far more precision and sonically transparent volume control than even the highest-quality potentiometers can. A temperature-compensated tracking circuit that maintains ideal signal balance in all conditions. Because the optically controlled resistors are electrically isolated from the control circuits, they are as sonically benign and musically transparent as a conventional high-quality resistor.

*All Units are Available in Black at an Additional Cost*

Constellation Altair II Preamplifier User's Manual


Inputs: 4 XLR stereo, 4 RCA stereo

Outputs: 2 XLR stereo, 2 RCA stereo

Output Noise: <20 uV dB, 20 Hz - 20 kHz


<0.001%, 20 Hz - 20 kHz @ 2V out, RI >10 K

<0.1%, 20 Hz - 20 kHz @ 10V out, RI >10 K

Frequency Response: 10 Hz to 200 kHz, +/- 0.5 d

Input Impedance (balanced): 200 K

Input Impedance (single-ended): 100 K

Output Impedance: < 50 ohm

Volume Control Resolution: 0.1, 0.5, or 1 dB; user-selectable

Recording Outputs: 1 XLR stereo, 1 RCA stereo


84 lbs - line stage

26.2 lbs -  power supply

Dimensions (W x H x D)

17.5 x 5.53 x 14.8 in (whd), line stage
44.5 x 14 x 37.6 cm (whd), line stage

17.5 x 2.82 x 14.5 in (whd), power supply
44.5 x 7.2 x 36.8 cm (whd), power supply

Constellation Award 2022

Contact us to inquire how you can finance your purchase through our partner, Synchrony.