Raidho TD4.2

The sound is authentic and live, delivering powerful music experiences. This symmetrically build extends all the way to the bass. TD drive units makes the speaker ingulf you in a holographic landscape of sound.

With multiple bass driver it may produce the same volume and go as deep as much bigger woofers, just with much better impulse response resulting in a very dynamic and articulate sound. This also makes it possible to keep the front plate slim, thereby reducing diffraction. This adds to a wide and precise sound stage.

The sound is authentic and live, and TD4.2 will deliver musical experiences from the smallest, intimate performances and to the biggest bands, with impact, dynamics, and musical scale in the most convincing of ways.

Technical Information-

TD4.2 White Pages
Raidho Series TD Drive Unit

This is truly aunique and revolutionary drive unit! 100% developed and built in-house by Raidho. The goals was simple: nocoloration and outstanding dynamic capabilities.

The motor comprisesof a very strong magnet (N52Neodymium) with an unseen even magnet field, coupledwith an underhungtitanium voice coil. This arrangementgives the drive unitthe most powerful underhung magnetsystem in the world. The benetfit from an underhung voiciecoil over the traditional overhung, is that it is much more linear and better dynamic capabilities. The result is perfect transient response with no measurable distortion.

To enhance the strength of the magnetic motor even further, we designed a new titanium voice coil using square shaped wire that eleminiates air in the voice coil windings. Leaving no possibility for air gaps to interfere with the magnetic field. The complete magnet system, as well as the basket itself is shaped like a turbine which eliminate any sound reflections, which would otherwisesmear the original sound. The solid coppering over the inner pole piece very effectively minimizes inductance and linearizes impedance. The suspension parts are as soft as possible to insure as little mechanic restraints to movement of the diaphragm.

The Legendary Raidho Ribbon Tweeter

Proprietary ribbon tweeter is a unique design. It is completely designed and build by hand in-house in Denmark. To be exact, it is a planar Magnetic Tweeter due to the tracks in the foil.

The foil is 11 micron thick, which means it is 50 times less mass in comparison to a conventional dome tweeter. This is because there is no voice coil and the extremely low weight of the foil (20 milligrams).

The result is virtually no resonances or distortion, and the breakup point is at an incredible 82 KHz! What you hear is amazingly clear and natural sound. All the detail in the world, but no fatigue, no distortion, and no coloration!

Elegant Design by Raidho

The TD4.2 is first in the TD line with a true MTM configuration.



3 way

Bass Loading

Bass reflex Port in rear, Impulse optimized - Conform


1 x Raidho TD Ribbon Tweeter

2 x 5” Raidho Tantalum Diamond midrange

2 x 6.5” Raidho Tantalum Diamond bass

Crossover Point

400Hz and 2.4 kHz stepped slope

Frequency Range

25Hz - 50 kHz +/-3 dB


88dB 2,83 V/m

Nominal Impedance

6 Ohm

Power Requirement

50 – 300 Watts


Piano Black, Walnut burl veneer or any colour to order

Dimensions WxHxD, mm

440x1585x600 including feet

Enclosure WxD, mm

200 x 600

Weight, kg


Materials PDF / Downloads

Click on the links below to download documents:

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