Dexter Trio
Nothing between the listener and the music.
Technology earned, not borrowed.
Dexter Trio is a 2.5-way floorstander built around the same technologies as the rest of the series. Diamond tweeter, M-Core cabinet, Loaded Reflex Line — nothing has been simplified to reach this form factor. The result is a speaker that works with its environment rather than demanding particular conditions from it.
Diamond and ceramic, resolved as one design.
A diamond tweeter and two ceramic mid/bass drivers, each designed by Marten. Around them, every element — cabinet, crossover, bass loading — developed to the same standard as the rest of the series. A triple-layer cabinet built to remove resonance from the equation. A crossover resolved individually for the drivers it serves. A bass loading system that delivers deep, controlled output with minimal distortion. The integration is the design.
The tweeter is diamond. Not as an option. Not as an upgrade. It was the starting point for every design decision that followed.
The engineering is present in every detail.
You simply cannot hear it.
Features
Diamond tweeter
The hardest diaphragm material available, with a stiffness-to-mass ratio no other material matches. Pistonic motion beyond the audible range — vanishingly low distortion, transient response that reflects what is recorded rather than approximating it.
Ceramic mid-bass
Two 7.5″ ceramic mid/bass drivers, designed by Marten, handle everything below the tweeter in Dexter Trio. High stiffness and low mass keep them pistonic across their operating range — delivering the transparency and control that define the series.
Multi-diverse crossover
A custom crossover developed specifically for Dexter. Each order and transition point is resolved individually — not as a compromise between constraints, but as a deliberate choice for the drivers it serves.
Bass loading
The Loaded Reflex Line manages bass through a shaped internal channel that exits through a wide downward-firing slot — a principle shared with Coltrane Quintet. Reduced air velocity. Deeper, more controlled output. Greater freedom in placement.
Jorma Duality wiring
Jorma Duality, handmade in Sweden. Ultra-pure copper conductors forming a direct signal path from crossover to driver. Standard across every model in the series.
The speaker disappears.
The music does not.
Marten Isolators, developed with IsoAcoustics, substantially decouple the cabinet from the floor — reducing resonance transfer and opening the soundstage. The cabinet is M-Core triple-layer construction, with a carbon fibre laminate faceplate surrounding the tweeter.
Four finishes,
hand-applied.
Four finishes, each expressing the same design in a different material. True Grain Oak — new to Marten and exclusive to the Dexter series — retains the natural texture of the wood, tactile in a way that is particular to this finish. The matte veneers are hand-sanded and sealed. The piano finishes are built up through multiple lacquer layers and polished to depth.
Dexter Trio
| Configuration | 2.5-way |
| Tweeter | 1" Marten pure diamond |
| Mid/bass | 7.5″ Marten ceramic × 2 |
| Crossover | Multi-diverse order, 2,000 Hz |
| Frequency response | 21–45,000 Hz ±2dB |
| Sensitivity | 91dB / 2.83V |
| Impedance | 6 ohms (3.6 ohms min) |
| Power rating | 300W |
| Terminals | Single-wiring, pure copper rhodium-plated |
| Internal wiring | Jorma Duality |
| Cabinet | M-Core triple-layer |
| Dimensions W × H × D | 23–29.6 × 100 × 38 cm 9–11.6 × 39.4 × 15″ |
| Weight | 45 kg |
| Stands | Mirror polished stainless steel with Marten Isolators |
| Finishes | True Grain Oak · Matte Walnut · Piano Walnut · Piano Black |
| Internal wiring | Jorma Statement |
| Crossover | Highest quality components |
Handbuilt in Mölndal, Sweden.