Raidho D-1 loudspeaker

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Raidho D-1
Raidho D-1 loudspeaker

Raidho’s C-1.1 standmount manages to couple outstanding detail, analysis and musical insight with a sense of fun, and in the process creating a loudspeaker that proves quality is more important than quantity. It’s so good in fact, it poses a problem for Raidho – where next?

The Raidho D-1 occupies the same physical cabinet, with the same broad specifications, same cleverly decoupled stand system, even the same FTT75-30-8 sealed quasi-ribbon tweeter as the C-1.1. In fact, it’s all about the bass unit, and were that bass unit not white in the C-1.1 and matt black in the D-1, you might struggle to physically tell them apart.

In place of white, aluminium oxide, the D-1 uses one and a half carats of pure diamond (that’s industrial, rather than mined diamond) applied to each cone. The industrial diamond bonds to the ceramic cone surface, in a 10µm thick layer. While diamond doesn’t sparkle unless it’s cut in a facet pattern, the diamond layer is bonded to carbon in graphite form on the outer layer, hence the none-more-black drive unit face.

This took years to get right; get the mix wrong and you lose stiffness, you get a cone surface that will shatter the first time you put a signal into it, or something that delaminates fast. But, get it right and you have a super-stiff, super-fast bass driver with a break-up point in the presence region beyond 20kHz. And instead of a 12dB spike where our hearing is most sensitive, there’s a 3dB resonance peak up where it really isn’t. 

There is an observation to make here, which applies to the C-1.1, but is all the more noticeable with the D-1. You tend to move the speakers further into the room and wider than you might expect. It also makes the care and attention required to get the best from a Raidho even more prevalent. Precise amounts of toe-in and distance from rear and side walls are critical; the speaker sounds good regardless, but the difference between a rough set-up and obsessive-compulsive levels of installation is the difference between ‘good’ and ‘Good God!’

They are forgiving enough to make a fairly good sound used with almost anything and simply ‘plonked’ down in the room. But the more care you apply to the overall installation and accompanying components, the more you get from the D-1, and it quickly begins to eclipse most speakers.

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