Thai manufacturer Kaliber Technology has turned its Ulysse X5 into a full range. The Kaliber Ulysse series now counts three models: the flagship Ulysse X5, the slightly smaller Ulysse X3 and the fully passive Ulysse XC. All three share the idea that made the X5 stand out when it was first shown at BIAV 2025 in Bangkok: a cabinet milled from solid blocks of magnesium.
Kaliber Ulysse: a cabinet milled from magnesium
Kaliber calls the X5 the world’s first loudspeaker built from solid magnesium blocks. The cabinets are CNC-milled from magnesium block and plate, a material chosen for its vibration damping and stiffness at a low weight compared to aluminium. The base combines magnesium with T6061 aluminium, SS304 stainless steel and brass in what Kaliber calls its Varicurv design. Even so, the numbers are serious: a single Ulysse X5 cabinet weighs 326 kg, with another 100 kg for its external crossover.
Every Kaliber Ulysse model uses the same upper section: a 1-inch custom pure diamond tweeter, a 4-inch ScanSpeak Illuminator midrange and two 7-inch ScanSpeak Illuminator woofers. The angle of the mid/high section can be adjusted with a knob-controlled tilt mechanism at the rear, so the listener can align the drivers with the listening position. Sensitivity is selectable at order: 88 dB or 90 dB (2.83 V/1 m).
Ulysse X5 and X3: four-way hybrids
The Ulysse X5 and X3 are four-way modular systems that combine a passive upper section with an active bass section. The passive crossover uses Duelund CAST capacitors and lives in a separate housing, away from the vibrations of the cabinet. The crossover points sit at around 60 Hz, 250 Hz and 2.6 kHz. Below 60 Hz, a custom AudioTechnology driver takes over, driven by its own amplifier with active DSP and room correction.
The difference between the two is mainly in that bass section. The X5 uses a 15-inch driver and reaches down to 20 Hz (±3 dB in room), while the X3 uses a 13-inch driver and is specified down to 25 Hz. The X3 is also more compact at 67.6 × 87.4 × 125.6 cm and 285 kg per cabinet, against 71.6 × 93.5 × 126.5 cm for the X5. Both models need at least 100 W RMS for the passive path and a dedicated subwoofer amplifier of 600 W RMS or more. Nominal impedance is 4 ohms above 60 Hz, with a minimum of 2.6 ohms at 228 Hz.
Ulysse XC: fully passive
The Ulysse XC drops the active bass module and works as a three-way passive loudspeaker, with crossover points at around 250 Hz and 2.6 kHz. It keeps the same diamond tweeter, Illuminator midrange and twin 7-inch woofers, and is specified from 32 Hz to 40 kHz (±3 dB in room). That makes the XC the most straightforward Kaliber Ulysse to drive: one amplifier of 100 W RMS or more per channel, without a separate subwoofer amplifier. It measures 63.6 × 68 × 93.5 cm and weighs 220 kg per cabinet, plus a 200 kg crossover box.
Diamond tweeters are rare at this level, but not unique. For another take on a diamond-equipped flagship, see our article on the Estelon X Diamond Mk II.
Pricing and availability
Kaliber Technology has not published prices for the new Ulysse X3 and Ulysse XC. When the Ulysse X5 was introduced in 2025, it was listed at US$259,000 per pair. Every Kaliber Ulysse is finished to order in a custom colour, matte or high gloss. More information is available on the Kaliber Technology website.
Key specifications
- Cabinet: CNC-milled solid magnesium block and plate
- Drivers (all models): 1″ pure diamond tweeter, 4″ ScanSpeak Illuminator midrange, 2 × 7″ ScanSpeak Illuminator woofers
- Ulysse X5: 4-way hybrid, 15″ AudioTechnology subwoofer with DSP, 20 Hz–40 kHz, 326 kg per cabinet
- Ulysse X3: 4-way hybrid, 13″ AudioTechnology subwoofer with DSP, 25 Hz–40 kHz, 285 kg per cabinet
- Ulysse XC: 3-way passive, 32 Hz–40 kHz, 220 kg per cabinet
- Sensitivity: 88 or 90 dB (2.83 V/1 m), selectable at order
- Impedance: 4 ohms nominal, 2.6 ohms minimum
- Crossover: external, with Duelund CAST capacitors
- Price: Ulysse X5 US$259,000 (2025); X3 and XC not announced
