Two and a half hour audition of the Raidho C1.1


I had the opportunity to audition this unique 2 way all by my lonesome (except for the dealer who was kind enough to remain invisible most of the time) with my own music. The speakers were hooked up to all Rowland electronics (monoblock amps, Criterion preamp, and new DAC) via top of the line Nordost cables. The room was a large open room with minimal room treatment. Unfortunately, there was a litter of speakers in between the C1.1s, like in most dealer show rooms.

I compared this "system" to my home system that I have been tweeking for the past two years with extensive room treatment (GIK acoustics), different cabling (Ridge Street Audio), amps (Carver Cherry 180 and Atma-Sphere M60), DACs (DAD Tube 10 and Tranquility SE), and preamps (Bent Audio Tap X, Dodd Audio Battery Buffer).

The C1.1 system (from now on I'll just refer to it as C1.1), despite being in a dealer room setting, came pretty close to my home system, and in one regard surpassed my system. First, the C1.1 midrange is neutral without sounding thin or harmonically bleached. My system has just a little bit more bloom in the midrange due to the tube DAC and tube amps. Midrange clarity was pretty close, may be the slightest advantage to the C1.1s. Vocals were just captivating with the C1.1s. Classical guitar was the most neutral I've come across.

Bass is more extended in my system (subjectively down to mid 30s), but the C1.1s are bit more punchy and dynamic (may be the solid state electronics have something to do with this). The Sasons and C1.1s are remarkable in the mid and upper bass information, and as such both systems have excellent bass definition and harmonics. I didn't think the C1.1s required subwoofers, unless you want to play organ or classical music and rock music to near concert hall levels.

Where the C1.1s surpass my system with most recordings is in the high frequencies. That planar magnetic tweeter is a remarkable. It is smooth, extended, and detailed a the same time. I did not get fatigued at any point in the session, except when a cut from The Who was played, but not unexpected from a 70s rock recording. The silk dome tweeters in my Sasons were outclassed. As far as silk dome tweeters go, the Sason tweeters are some of the best of its breed and integrate seamlessly with the mid/woofer. However, the C1.1 tweeters integrates seamlessly with the ceramic sandwich mid/woofer just as well, but with more detail and extension without calling attention. The microdynamics and detail in the upper midrange and treble are some of the best I've heard, equaling some of the finest electrostats and ribbon speakers.

In terms of sound staging and imaging, the upper hand goes to my system. My room has been tweeked for two years to bring out the best I can attain from my system. The Sasons in my room throw a taller, deeper and more layered soundstage. The C1.1s seemed to throw a little wider sound stage in the dealer room. Imaging is natural in both systems. Not over blown or microscopically pin point. However, the comparison is not unfair because of the two very different rooms, and the C1.1s were hampered by all the other speakers that were place in between them.

My overall impression: The C1.1 speaker is one of the few speakers out there that I would think about plunking down over $15k. Another speaker I would consider would be the Maggie 20.7s, but these are altogether different speakers with different set of requirements. It's very expensive for a 2 way (but not ridiculous like the Magico Q1s). Despite its performance, I'm still having a difficult time justifying the price of the speakers. The C1.1 system did not clearly best my system except for the upper frequencies, but the comparison is not really valid given the large differences in electronics and room. I think the Sasons are intrinsically slightly warmer speakers, although only side by side comparisons with the same electronics will tell. But I have this nagging feeling, if I were to hook the C1.1s in my system, the overall advantage (at least in terms of what I consider important in music reproduction) will go to the C1.1s.
dracule1
Thanks Vapor1 for your input. It may be true the C1.1 may sound better in my system, but I am happy with my system. The minor flaws I heard in my system have been pretty much solved by addition of a good stepped attenuator and going direct into the amp from my DAC. I do agree with you on the slightly lean sound of the C1.1s, which are excellent speakers by all accounts. But I do prefer the "heavier" and probably warmer presentation of the Sasons. I'm not sure if you heard my version of the Sasons which have the Dueland CAST capacitors and CAST resistors. I think mine are better than Robert's own pair which have the VSF caps and nonCAST resistors. If I didn't have the Sasons, the C1.1s would be my first choice.
04-18-12: Vapor1
Yes the comparison isn't perfectly valid in every way. […]

:-)

04-18-12: Vapor1
I will say that I'd wager in a same room/same electronics comparision, that you'd likely prefer the Raidho's.

That's interesting Vapor1. Other than the C1's bass which does go quite deep (Martin Colloms measured down to 29Hz in his room), but obviously not with much energy, how would you compare the treble performance between the Raidho Ribbon to the Sason Si's dome?
Well, I'll put it to you this way. When I was developing the Vapor Cirrus I had stacks and stacks of the best tweeters made ... still do. At the time the Raidho tweeter was available as a raw unit from Parts Express. Between it and the RAAL, it was a neck and neck race ... with both it and the RAAL leaving everything else in the dust in my opinion. I'm glad I didn't choose to use the Raidho tweeter because it soon became unavailable to OEM's. But compared to the other top tweeters I had like the Scan 7000, 7100, 6600, Seas Crescendo, Morel Supremo, etc ... the RAAL and Raidho tweeter both made all those top domes simply sound slow, lifeless, and boring.

I have a pretty bad-ass 3-way speaker with the Scan AirCirc in a big waveguide, and it sits collecting dust in my basement because even it sounds broken compared to what I'm used to.

I'm not saying everybody should agree with me, just stating my opinion that there no comparison between the top end of the Raidho and the Sason.
I agree Vapor. A properly implemented planar magnetic or ribbon tweeter has less distortion and are faster than silk dome tweeter. Problem is integrating a fast tweeter to the midrange/woofer. Many have failed at this (may be I'm just more sensitive to tweeter/midrange integration than most), but I think Raidho has pulled it off. However, some will argue that silk dome tweeters sound more natural and integrate better. As long as you use top quality crossover components to for the tweeter (eg, Duelands), the silk dome tweeter can come pretty close IMHO. The best stand alone tweeter I have ever heard is probably the Maggie true ribbon tweeter, but it doesn't integrate well with their planar magnetic midrange (the 3.7s are the best integration to date, but still I can hear the ribbons over the midrange). I have heard most of the "top" tweeeters, ribbons from RAAL and Raven, diamond from B&W and Thiel, and Beryllium from TAD and Scanspeak, and planar magnetic from BG and Raidho. With my current system as it stands, I have no wish to upgrade to speakers with these tweeters. If I wanted to go balls out on the best tweeter for my taste, I would get a 5 to 6 foot ribbon line source. Of course this means getting a full range ribbon line source speaker, but who truly makes a full range true ribbon speaker? I only know of one and they're in Sweden. Apogees had planar magnetic bass panel, despite claims otherwise.
Thanks for sharing your experience with us Vapor and congratulations on your Cirrus speaker which for many has pushed the boundary on price vs. performance.

You've observed that RAAL and Raidho tweeters made many of the top domes simply sound slow, lifeless and boring. To add to this I have observed that resolution tends to be superior with ribbons. Furthermore, when I was auditioning speakers prior to my purchase of the Raidho’s I did notice something else which differentiated the Raidho’s and that was their uncanny quietness. I perceived the speaker as providing a really black background against which to provide the music. Sometime after ownership that I stumbled across a lab report which showed very low distortion for the treble – typically 0.05% 2nd and 0.025% 3rd which is practically non-existent and at moderate listening levels close to electrostatic levels.

While I have found no sense of discontinuity through the cross over area Dracule does raise a fair point around the challenges of integrating a ribbon like tweeter with a cone woofer. The challenge as I understand it is not about “speed” but more pointedly about dispersion characteristics – though there is obvious linkage. In a discussion I had last week with Alon Wolf (founder of Magico); Alon was quick to point out the challenges of ribbon/cone integration as the reason for selecting dome tweeters for his latest Q series loudspeakers. I have auditioned the Q1, an obvious competitor to the Raidho C-1.1 though since the audition was not in my own system I will leave my observations to myself on this.

As a designer I wondered whether you might share your thoughts on the integration puzzle?