I haven’t heard the TAD Evolution One enough to understand its performance (only once at a show years back and wasn’t familiar with the electronics).
Raidho is lovely, one of my favorite speaker brands, up there with Borresen and Vivid Audio. Raidho is a very soulful speaker with innovative engineering and design that allows them to play with incredible clarity and deliver a huge sound for their footprint. They are very revealing, but also very refined. You can hear the effortless detail, but the top end is much smoother, softer than many other speaker brands. Some people absolutely love this, and others don’t. Bass and midrange are amongst the best in the combination of small driver size (speed) mated with innovative cabinet design and crossovers that minimize distortion. The result is complete openness and transparency, all with a slight sense of euphonic soulfulness.
In comparison, I’ve found Borresen Acoustics speakers to be more revealing and resolute, less euphonic and more true to the source. If you didn’t know, Michael Borresen was the long-time chief designer of Raidho prior to starting his own company and speaker line, which explains the design similarities in the two. While Borresen speakers like to have plenty of room behind them (3-4ft minimum), Benno Meldgaard of GamuT took over Borresen’s spot and reworked the Raidho cabinets to work well with slightly less room.
One thing to note about Raidho and Borresen is that they require a good amount of current to perform their best. They are not the easiest speakers to control and will reveal the shortcomings of any electronics. They tend to be 4-6 Ohm nominal but I’d bet they dip below 2 or 3 Ohm in the bass to lower midrange, and perhaps again in the mid-to-upper treble. With amplifiers that don’t drive them well, I notice a loss of control at the frequency extremes, resulting in a softness/blurring in impact while the midrange continues to sound glorious. With the right amplification, these speakers excel with any type of music regardless of complexity or simplicity and can truly deliver the “you are there” effect.
These speakers play utterly huge. Even the smaller floorstanders (Raidho TD 2.2, Borresen 02) can fill medium to large sized rooms without subwoofers. Disregard their low frequency spec - with room gain and proper charging, they go low and the midrange and treble can keep up as well. My room is 19x23ft with an opening to another room to the side in the back half of the room. The ceiling is slanted up to 18ft. The Borresen 02 fills this space with zero problems, again no subs needed. It might even benefit from having slightly more space. The larger Raidho focus more on giving you a dedicated midrange, more bass for larger space, etc.
If buying Raidho, I would caution you to not opt for their older models (C and D lines) as their tweeters were known to fry if you want to hear music at stadium concert levels. Their XT and TD series tweeters have been made more sensitive, with lower noise levels, all while being more robust. Borresen Acoustics speakers have accomplished the same.
In full disclosure have personally owned two sets of Borresen speakers and have heard different Raidho dozens of times. I am a Hifi dealer but do not deal for either brand.