Marten Isolators
Developed in close collaboration with IsoAcoustics, these Isolators are custom-designed to meet the exact weight, dimensions, and performance demands of the Supreme Extreme.
They decouple the cabinet from the floor, dramatically reducing resonance, distortion, and internal reflections.
The result is greater clarity, deeper bass, and a more open soundstage. With improved lateral stability and vibration control, the speaker disappears - and the music takes centre stage
Crossover
First order: 120Hz, 370Hz, 1000Hz, 4000Hz
The first-order crossover in Coltrane Supreme Extreme was developed from the ground up to match its dual-tower architecture.
Preserving perfect time and phase, it ensures every frequency arrives in absolute coherence - just as it was recorded. This design uses only the finest components: copper foil air-core coils, silver/oil and silver/gold capacitors and custom resistors.
The result is a seamless, natural sound with deep control and authority across the full range, especially in the low end.
Internal Wiring
Jorma Paragon is the flagship cable from Jorma, our most advanced internal wiring to date.
Handmade in Sweden, it features ultra-pure copper, separate conductors for signal integrity, and premium shielding to reduce noise.
Paired with our custom crossover, it forms a clean, direct signal path that preserves the full detail and dynamics of the recording. Chosen for its unmatched performance, it ensures Supreme Extreme delivers music with absolute clarity
Bespoke Terminals
Custom-made for Coltrane Supreme Extreme, these terminals are designed to match the speaker’s exact performance requirements.
Made from the highest quality materials, they offer low resistance, excellent conductivity and long-term mechanical stability. Precision engineered for a secure and consistent connection, they reflect the same attention to detail found throughout the entire design.
Every detail matters
These are the numbers behind the experience. The foundation that makes Coltrane Supreme Extreme what it is.
The closest we’ve ever come.
Coltrane Supreme Extreme is the speaker we’ve spent years dreaming of—designed with no limits, built with no shortcuts. It sets a new benchmark for what’s possible. For those who seek the same philosophy in a more compact form, Coltrane Quintet Extreme carries this vision forward—sharing the same heart, soul and sonic purity in a single tower design.
