Heaven 11 Audio Billie Amp MK3 Spartan |The Essence of Control
The Billie Amp MK3 Spartan brings tube-like dimensionality to a compact, high-power hybrid design, pairing spacious depth and rich tonal body with solid bass impact and persuasive dynamics. Audiophiliac found it equally engaging at late-night levels or played loud, while its clean industrial design, tactile walnut controls, and eight analogue inputs make it a refined hub for source-led systems.
WATT RECOMMENDS
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Nicely Roasted
Sound Quality
92/100
Build Quality
87/100
Features Connectivity
83/100
Value for Money
85/100
Pros
Sweet, spacious tube-informed presentation with dimensional front-to-back depth and weight.
Non-fatiguing, even-handed sound remains satisfying at both quiet and high listening levels.
Strong bass definition, impact, and soft-to-loud dynamic expression.
Exceptional tactile design, including solid-walnut controls, plus eight RCA analogue inputs.
Cons
The Spartan’s minimalist specification omits built-in DAC, Bluetooth, and phono facilities, requiring external source components.
The remote works reliably but was less appealing to the reviewer than the physical controls.
WATT RECOMMENDS
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 92/100
The Billie Spartan is described as a lovely, sweet and notably non-fatiguing amplifier that remains satisfying at both low and high listening levels. Its tube preamp character brings body, depth and spaciousness, while the high-power hybrid design is reported to retain bass solidity and convincing dynamic movement.
Transparency Resolution
91/100
Tube choice materially shapes the presentation: the 12AU7 option was heard as clearer, more see-through and more transparent. The ECC99s traded some of that openness for a richer, fuller and weightier sound.
Tonal Balance Musicality
93/100
The reviewer repeatedly calls the sound beautiful, sweet and lovely, with an even-handed character. It was especially praised for being easy to listen to over long sessions without fatigue, whether played loudly or quietly.
Dynamics
91/100
Soft-to-loud shifts on demanding music were said to be reproduced very well. Bass was also described as having definition, impact and solidity, and the amplifier remained musically involving during late-night, low-volume listening.
Soundstage Imaging
92/100
The tube-driven presentation was heard as dimensional, with weight and spaciousness extending from front to back. The review specifically highlights depth rather than merely a broad left-to-right spread.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
87/100
The reviewer was impressed by the amplifier's look and feel, and singled out the control knobs as exceptionally satisfying to use. The available coverage does not discuss internal construction, thermal behavior or long-term durability in detail.
Features Connectivity
83/100
The Spartan is intentionally minimalist, omitting the optional DAC and phono facilities found elsewhere in the range. It still provides eight RCA analogue inputs, a front-panel 3.5 mm headphone output, mute via the input selector, and a remote control.
Value for Money
85/100
The reviewed Spartan was priced at $2,750 in black or silver. The review is highly favorable about its sound, but does not directly assess its value against competing integrated amplifiers at this price.
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Specifications
- PREAMP
- Class A Mu-follower, JJ ECC99 tubes [12BH7, 12AU7 compatible]
- AMPLIFIER
- Class D: ICEpower 200AS2 or Hypex NC252MP
- ICEPOWER 200AS2
- 215 watts RMS@4Ω | 120 watts RMS@8Ω
- HYPEX NC252
- 250 watts RMS@4Ω | 150 watts RMS@8Ω
- INPUT VOLTAGE
- 120-240 V | 50-60 Hz [factory set via dongle]
- 8 ANALOG INPUTS
- 8 x RCA
- UPDATE PORT
- 1 x USB-C [Mac & PC compatible]
- HEADPHONES OUTPUT
- 1 x 1/8″ (3.5mm)
- SPEAKER OUTPUT
- 1 x speaker pair: 5 way binding post
- DIMENSIONS (L X D X H)
- 15.75″ x 8″ x 3″ 400mm x 204mm x 75mm
- WEIGHT
- 13 pounds | 6 kilos
- INCLUDED ACCESSORIES
- -Power cord -Remote -Manual
- WARRANTY
- 5-year warranty
Manufacturer's Description — Heaven 11 Audio
The Spartan edition is engineered for audiophiles who already know what they want — and want nothing in the way. It eliminates digital processing in favor of a clean, analog-only path, built around our celebrated tube preamp and featuring an impressive 8 RCA inputs for total system versatility.
Perfect for those who prefer using their own high-performance DACs and phonostages, Spartan gives you full flexibility over your signal chain. Customize your power module, tubes, knobs, and headphone amp — every choice tailored to your preferences.
The Billie Spartan shares the same enclosure as the Classic: compact, robust, and performance-driven. Like the Classic, Spartan is future-ready. Both the headphone module and tubes are user-upgradeable, while firmware updates install effortlessly via Mac- and PC-compatible USB-C. This is an amplifier that adapts to your system, not the other way around.
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