Slick Silver or Bold Black? Your first choice is a simple one —both chassis share the same premium finish; only the color differs. Not sure which to pick? We suggest matching it to your existing gear or the overall vibe of your listening space.

The Core DAC module features the ESS ES9039, offering 192kHz/24-bit resolution with DSD and Hi-Res audio support.
The Performance DAC Module builds on this foundation with a dual ES9039 configuration, enhanced clocking, upgraded voltage regulation, and additional refinements to dynamic range and noise floor. The result is a cleaner, more spacious soundstage and a heightened sense of detail and realism—reference-level performance. For those seeking the very best from their system, it’s a compelling step forward.

The core Headphone Amp handles a wide range of common headphone impedances with ease, delivering ultra-low distortion and a low noise floor.
The PERFORMANCE Headphone Amp features an entirely distinct dual-mono architecture, offering exceptional clarity and wide bandwidth to preserve dynamics. With robust output capable of driving even 600Ω loads, it’s a worthwhile upgrade for those who demand more from their headphones.

Choose between two JJ ECC99 tube options to fine-tune Billie’s sonic character. The JJ ECC99 Red, delivers a smooth, warm, and rich presentation with slightly rolled-off treble, full mids, and deep bass. It offers solid detail retrieval and soundstage width, with a more forgiving, relaxed tone.
The JJ ECC99 Gold takes a more analytical approach—detailed, open, and dynamic, with extended treble, transparent mids, and tight bass. It presents a wider soundstage, heightened resolution, and an energetic, engaging character.

[ Click here to view a comparison table ]

Billie ships with American-walnut knobs, or you can upgrade to one of our premium knob pairs instead. Select from solid hardwoods or authentic stone, each material offering its own unique visual appeal and tactile experience. [More info on knobs found here. ]