Orchard Audio Starkrimson HT Ultra Takes GaN Class D Into Home Theater With Up to 500W Per Channel

Class D amplification has spent the better part of two decades trying to convince audiophiles that small, efficient and cool-running are not synonyms for cheap, sterile and disposable.

We have covered that evolution rather extensively at eCoustics, including the rise of Hypex, Purifi and GaN-based designs that have made some of the old complaints about Class D sound increasingly like arguments over whether CDs can ever replace cassettes.

Orchard Audio has been part of that conversation for years with its Starkrimson amplifiers. Now the New Jersey manufacturer is moving the technology into home theater with the Starkrimson HT Ultra Series, available in three, four and five-channel configurations.

The last part is relevant because this is not our first encounter with Orchard Audio in a theater system. At Capital Audiofest 2025, we heard an SVS 5.2.4 system powered by Orchard amplification and came away impressed by its dynamics, control and value. The HT Ultra simply turns that concept into a purpose-built product rather than an audiophile science project involving a small mountain of separate amplifiers.

Related: Fear And Loathing In Class D Amplifiers: What $130 To $50K Actually Buys

What Exactly Is GaN?

GaN stands for gallium nitride, a wide-bandgap semiconductor material used here in place of the silicon MOSFETs found in most Class D amplifiers.

GaN transistors can switch faster with lower switching losses than conventional silicon devices. That does not automatically make every GaN amplifier sound better; circuit topology, feedback, power supply, PCB layout and output filtering still matter enormously, but it gives designers considerably more room to work at higher switching frequencies while controlling heat and efficiency.

Orchard’s Starkrimson Ultra circuitry switches at approximately 800kHz, which the company says is three to four times faster than traditional silicon-based Class D designs. Its modulation is performed entirely in the analog domain, using Orchard founder Leo Ayzenshtat’s proprietary DC-coupled, fully balanced dual-feedback modulator and bridged GaN output stages.

And no, the “D” in Class D still does not mean digital. We have been over this.

The Power Supplies Are the More Interesting Part

The HT Ultra uses Orchard’s Starkrimson Ultra 500W amplifier modules and 1200W power supplies, but buyers can determine how those resources are distributed.

The five-channel model can be configured with one, three or five 1200W supplies. The four-channel version offers one, three or four, while the three-channel model uses one shared supply. Higher-performance configurations add 43,600µF capacitor boards to channels that receive dedicated supplies.

That allows someone building a hybrid music/home-theater system, for example, to give the front left and right channels dedicated power supplies and capacitor reserves while the center and surrounds share another supply.

That is considerably more interesting than simply putting five identical amplifier modules in a box and hoping nobody asks what happens when all of them get hungry at once.

Starkrimson HT Ultra Specifications:

• Channels: 3, 4 or 5
• Output: 250W into 8 ohms / 500W into 4 ohms*
• Gain: 19dB
• Amplifier topology: GaN Class D
• Switching frequency: approximately 800kHz
• Signal path: fully balanced
• Power supplies: 1200W each, configuration dependent
• Capacitor boards: 43,600µF each on selected configurations
• Load capability: 2-ohm capable; Orchard specifies stability down to 1 ohm
• Inputs: Balanced XLR
• Power-on: Front-panel control or trigger input

*The 250W/500W rating applies when a channel has its own power supply or when two channels share one. That qualification matters rather more than the number printed in 72-point type on an amplifier brochure.

One installation detail also deserves attention. Orchard specifies that the five-channel/five-power-supply configuration requires a 20A circuit in 110/120V countries. Your electrician may therefore become part of the upgrade path.

Price & Availability

The Orchard Audio Starkrimson HT Ultra Series is available for preorder now, with current discounted pricing ranging from $3,199.95 to $6,399.95, depending on configuration. Orchard says the preorder pricing represents 20% off MSRP, with initial shipments expected in December 2026 or January 2027.

The Bottom Line

GaN itself is no longer enough to make an amplifier unusual. What makes the Starkrimson HT Ultra interesting is Orchard Audio taking the same amplifier architecture it developed for serious two-channel systems and allowing home-theater buyers to decide where the expensive power-supply hardware actually goes.

A five-channel amplifier with five independent 1200W supplies is very different from one asking all five channels to drink from the same trough.

Class D already won the argument over whether it belongs in high-end audio. Orchard Audio now wants to know whether your home theater has been paying attention.

For more information: orchardaudio.com

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