Floorstanding loudspeakers — Raidho Acoustics TD3.8

The TD3.8 is a large three-way loudspeaker for floor placement in the TD Series from Raidho Acoustics, the Danish company that designs and builds its drivers in-house in Pandrup, northern Denmark. Launched at the Munich show in 2024, it is described by Raidho as its first midsized floorstander with large drivers, and in the TD Series it sits below the TD6, TD4.8 and TD4.2.

Key specs that matter

Raidho combines its TD ribbon tweeter with two 5 in (125 mm) midranges and two 8 in (200 mm) woofers, with crossover points at 400 Hz and 2.4 kHz. The cabinet is a bass reflex design with a rear port. Response extends from 24 Hz to 50 kHz and sensitivity is 89 dB, with a 6 ohm nominal and 4 ohm minimum impedance. The recommended amplifier range is 50 W to 300 W. Each cabinet measures 440 x 1420 x 620 mm (width, height, depth) and each speaker weighs 83 kg.

Engineering and use context

Midrange and bass cones use Raidho's TD construction, a five-layer sandwich of aluminium, ceramic and tantalum finished with a thin deposit of artificial diamond applied in a vacuum process with argon gas. The five layers raise internal damping and stiffness together. Every driver has a proprietary edge-wound voice coil and a neodymium motor system rated at more than 1.1 tesla, and the turbine-shaped magnet and basket assembly limits reflections behind the cone. The ribbon tweeter is a planar magnetic unit with a membrane of about 11 micrometres, weighing around 20 mg. For the TD Series it gained a stronger magnet and a redesigned rear chamber, which Raidho states lowers distortion by 35 dB and raises sensitivity by 2 dB over the earlier version. The two midranges flank the tweeter in an MTM arrangement, which Raidho uses to lower distortion and crossover points and to control dispersion. The crossover uses stepped slopes, adds more out-of-band filtering while raising the power handling of each driver, and sits in the base of the cabinet with all acoustic treatment inside. The enclosure is 250 mm wide without the feet and was redesigned for internal airflow, with a bullet-shaped top and a narrow rear. Finishes are piano black, burl walnut veneer or any colour to order.

Pairing

With moderate impedance and sensitivity, the TD3.8 suits solid-state amplifiers of 100 W or more and valve designs of similar power. Its bass extension is best used in rooms of 30 m2 and larger, and its size and weight need to be planned into placement.

Alternatives

Raidho's TD4.2 is the next larger floorstander in the TD Series, intended for bigger rooms.