Напольная акустика — Raidho Acoustics C3.2

The C3.2 is a narrow floor-standing three-way design in the C Series of Raidho Acoustics. Raidho belongs to Dantax Radio A/S, and its loudspeakers are built in Pandrup, Denmark. The C Series takes its name from the Ceramix cones used for every cone driver in the range. Raidho now lists the C3.2 among its past models, noting that these older designs cannot be upgraded to the newest generation even where the cabinets look alike. The maker intends it for mid-sized rooms.

Key specs that matter

The driver complement totals five units. A ribbon tweeter covers the top, a single 100 mm Ceramix midrange handles the band between the crossover points, and three 115 mm Ceramix woofers take everything below 150 Hz. The upper crossover is at 3 kHz, and both filters are second order. The rated range runs from 30 Hz to 50 kHz, sensitivity is 88 dB at 2.83 V and 1 m, and nominal impedance stays above 5 ohm. Raidho asks for at least 50 W per channel. The cabinet is 200 mm wide, 1,235 mm tall and 465 mm deep, growing to 320 x 1,320 x 500 mm with its spiked base, and each speaker weighs 53 kg. Finish choices are black piano lacquer, walnut burl veneer or any custom paint colour.

Engineering and use context

Raidho argues that a true three-way layout lets each driver work in a narrower band, so it can be tailored more closely to that job. For the midrange this means a lighter membrane and lower moving mass, which in turn allows a softer suspension around the region where midrange meets tweeter. Each Ceramix cone is a sandwich - thin, stiff aluminium oxide skins on both sides of a softer aluminium core - which combines rigidity with some internal damping. The cone drivers use underhung motors. The planar magnetic ribbon tweeter works in a sealed chamber, has no voice coil, and uses a foil 11 microns thick and 20 milligrams in weight, with its breakup placed at 82 kHz. Bass loading is by a reflex opening at the back of the box, leaving the narrow front baffle for the five drivers alone.

Pairing

A benign impedance and fair sensitivity leave the C3.2 undemanding for transistor or valve amplifiers that clear the stated power minimum. Since the port fires backwards, each tower needs clear space between its rear panel and the wall.

Alternatives

The Raidho D3.1 uses the same five-driver three-way layout and cabinet front but swaps the Ceramix cones for diamond-coated drivers and is rated at 90 dB.