Reference Series
Hercules II / Monoblock Power Amplifier
REFERENCE ALTAIR II Line Stage ORION Phono Stage HERCULES II Mono Power Amplifier HERCULES II Stereo Power Amplifier
Hercules II / Monoblock Power Amplifier / Overview
Hercules II Monoblock Power Amplifier
When one of America’s best-known audio reviewers described our original Hercules amplifier, along with our Altair preamp, as “the most transparent, detailed, and cleanest electronics I’ve heard,” we knew our “dream team” of top audio engineers and industrial designers had achieved its goal: to create the world’s best amplifier.

While no one could ask for more performance, some dealers and customers asked if we could build the tower-shaped Hercules in a more traditional, horizontally oriented enclosure that could fit into equipment racks. This is exactly what we have done with the Hercules II Mono. The amplifier circuitry is the same, merely reconfigured to fit the new enclosure.

The new form factor also gave us space to incorporate significant upgrades. The Hercules II Mono power supply uses larger storage capacitors than the original Hercules, so the DC power is even cleaner and better to respond to extreme peak demands. We also had room to double the size of the copper bus bars used on the power supply rails and the speaker outputs. Both of these changes further enhance performance into low-impedance speakers.

The dual 3,000-watt power transformers are now enclosed in their own shielded, suspended enclosure, along with the control circuitry. The shielding protects the audio circuitry from electromagnetic interference produced by the transformers and control circuits. The suspension prevents vibration from the transformers from leaking into the audio circuitry or into the listening room.

Although the form factor of the Hercules II Mono is more convenient, it still delivers the same incomparable combination of tube-like warmth and limitless dynamics.

Hercules II Monoblock Power Amplifier
We’ve always loved the depth and delicacy that single-ended triode tube amps provide, yet we wanted more: more power, more dynamics, and more compatibility with different types of speakers. Thus, we based the original Hercules design on a single-ended amplifier: a 125-watt design tuned purely for musicality. By building these single-ended amplifiers as modules, and combining multiple modules in a single chassis, we could create a 1,000-watt monoblock that sound exactly like that original 125-watt amp.

The Hercules II Mono employs a revolutionary twist on the concept of a fully balanced amplifier. In all balanced amplifiers, mirror-imaged amplifier circuits are used, with one part amplifying the positive half of an audio signal, and the other part amplifying the negative half. Yet in other balanced amps, the two halves are not quite equal, because one uses N-type transistors and the other uses P-type transistors. Hercules II achieves an essentially perfect balance by combining two matched single-ended amplifiers using only N-type output transistors. Every element of the musical signal passes through exactly the same types of circuit components, maintaining all the musicality of the original single-ended module.

Of course, if the incoming audio signal is not perfectly balanced, it does little good for the amplifier to be perfectly balanced. To ensure a pristine incoming signal, we equip Hercules II Mono with our Line Stage Gain Module, the same circuit used in our Altair II line stage. Our Constellation Direct interface allows this gain stage to be bypassed if a Constellation Audio preamp is used.

As with its predecessor, the performance of the Hercules II Mono is not affected by the speaker, nor by the program material, nor by the listening volume. It delivers the same musical intimacy and emotion with any speaker, with any music, at any volume. It is exactly what audiophiles have always wished for... but never really dared to hope for.

Reference Series Index
Altair II Line Stage
Orion Phono Stage
Hercules II Mono Power Amplifier
Hercules II Stereo Power Amplifier

Inspiration Series Index
Preamp 1.0 Line Stage
Stereo 1.0 Stereo Power Amplifier
Mono 1.0 Monoblock Power Amplifier

Performance Series Index
Argo Integrated Amplifier
Virgo III Line Stage
Cygnus Digital File Player/DAC
Perseus Phono Preamplifier
Centaur II Power Amplifier
Centaur Mono Monoblock Power Amplifier
Centaur Stereo Power Amplifier

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