CES 2013: Diamond Raidho

I almost missed this, and shame on me for not spending more time drooling on this loudspeaker. Fact is, I found it early in the show and the room was packed. Yes, that was a clue, but still, I really didn’t notice the difference on this Raidho standmount loudspeaker until after I’d pulled the pics after Day 1 at the Venetian. I came back on Day 2, and the room was still packed. Oh well ….

So, here’s the skinny on the new D1 from Raidho — it’s diamond, baby, diamond!

Don’t get all freaky — the Raidho ribbon tweet is still in there — what I’m talking about is the mid/woofer. That‘s what is covered in diamond. Oh yeah. 140 times harder/stiffer than the ceramic used in the C-Series, the D-Series drivers push breakup out of the audible band. What this means is at least the potential for a more seamless, coherent, and natural sound.

At Raidho, we work with a process where the pressure to form the diamond bonds is formed by speed, where our ceramic membranes are bombarded by carbon ions, traveling at a speed close to the speed of light. In our process, we can reach around 50% SP3 bonds in the 10 um thick layer we build on top of the ceramic surface that are on our membranes. The rest of the material is SP2 bonded carbon, graphite. We have found that a 50% division between SP2 and SP3 is the optimum point for process ability, the atomic bonding and the improvements in membrane stiffness ratio.

We could process the surface layer into more dense structures with more SP3 and less SP2, but then we would have to reduce the layer thickness and thus get less of the improved stiffness we are searching for. The balance is the internal stresses created in the diamond forming process. If stresses are too high, the result becomes too brittle and as a result the bonding to the substrate delaminates. With just an increase to 60% SP3, we would have to reduce the thickness to 1/5 of what we can achieve now and then lose most of the stiffness gain. The graphite content makes the diamond layer black(ish) in finish.

Based on what I heard at CES, this speaker is very good, but honestly, I’d have to have it here to see what it can do against my reference TIDAL loudspeakers and with their diamond Diacera tweeters and all-ceramic drivers, which I’m totally willing to do. No problem at all. Really. Call me?


  • Size: 200 x 370 x 360 mm
  • Weight: 12.5Kg
  • Freq. response:50Hz – 50KHz
  • Impedance: > 6ohm
  • Crossover: 3KHz, 2nd Order

More info online. MSRP is $28,000 for the pair. Jeff Rowland electronics drove the D1, and Nordost Odin wire was used throughout.


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