Heed Audio Obelisk Pre
Marking a natural step up from the vibrant Obelisk Si integrated, the Obelisk PRE is the “command centre” of the Obelisk range, a thoroughbred analogue pre-amplifier with the option of using one or two of its inputs for digital-to-analogue conversion by add-on DAC or MM phono modules. It is a clear-out design that we’re convinced more than holds its own against many class-leading high-end competitors.
Although rather traditional in its basic topology, the circuit design of the Obelisk PRE represents the convergence of cutting edge ideas with highest-grade components. As opposed to many pre-amplifiers that have “dumbed-down” internal power supplies in order to present more dramatic sonic benefits with optional auxiliary power supply upgrades, the PRE has a sophisticated and generously sized on-board power supply that is based on a top-quality transformer and high-grade capacitors, custom made to our own specifications. Nevertheless, the last ounce of the PRE’s performance can be elicited by adding the Obelisk PX power supply.
The PRE accommodates 6 inputs of which one is exclusively dedicated to the digital domain and can be used with our optional Dactil 2.1 DAC module via 75 Ohm S/PDIF or optical TOSLINK connections, while a second one will accept either a further DAC module (only via S/PDIF in this case), or our optional MM phono module for vinyl replay (sans module, this input works as standard line-level connection).
Since DAC circuits are highly prone to interferences caused by analogue circuits integrated nearby on the PCB, we provided the on-board supply environment of the DAC module with two independent supply rails using a smart "unit within the unit” solution. Furthermore, all analogue amplifying stages (including the MM phono module) are built in dual-mono configuration and fed through no less than seven fully regulated voltage supply rails.
Modules can be easily inserted into slots on the main PCB and dedicated by jumper settings. Using modules internally instead of stand-alone auxiliary units provides many advantages: absolute synergy, no external cables and plugs, shortest possible signal paths, saving unnecessary costs for external case and power supply, etc.
The two pre-out connections of the Obelisk PRE make various configurations possible. Beside traditional single power amplification, it is also possible to use two power amplifiers for bi-amping or active mode. A tape-out connection is also available for use with a recorder or a headphone amplifier.
The Obelisk PRE can be suited with either the Obelisk PS stereo power amplifier or paired with a duo (or quad - depending on your requirements) of Obelisk PM mono power amplifiers. Functions of the included remote control (again - standard functionality of input selection 'out of the box' is mechanical) include volume control, but pair the Obelisk PRE with the superb Obelisk DA (purpose built multi-input D to A unit) and the remote will control input selection of the Obelisk DA too, making the PRE a consummate command centre for the most 'integrated' and sublime acoustic experience.
Available in a black casing with black fascia, or black casing with white fascia.
Heed Audio Obelisk Pre: Stereo Pre-Amplifier - Features & Benefits:
5 Analogue and 2 digital (RCA / Optical) inputs
Upgradeable power supply (see Obelisk PX)
2 Optional cards (DAC or MM phono)
Independent supply rails for analogue and digital
Heed Audio Obelisk Pre: Stereo Pre-Amplifier - Specifications:
Inputs: 5x analogue / 1x S/PDIF coaxial / 1x TOSLINK
Outputs: 2x preamplifier output / 1x Tape out
Frequency response (+0, -1 dB): 1 Hz – 105 kHz
Input impedance: 10 kΩ
Input sensitivity (for 775 mV out): 220 mV
Output impedance: < 35 Ω
Max. output level: 7.5 V
Gain: 10 dB
Headroom: 20 dB
SNR: > 100 dB
Supported upgrade cards: MM phono / DAC 1.2 / DAC 2.1
Power supply options: Internal / Obelisk PX
Max. consumption: 10 W
Weight: 4.5 kg
Dimensions (WxHxD): 22 x 8.5 x 36 cm
Heed Audio Obelisk Pre: Stereo Pre-Amplifier - Resources & Downloads: