I bought a pair of Ergo 31-DC speakers for a total of $200, which was an incredible bargain. The clarity, soundstage and bass are extraordinary. Most of the time I'm listening to classical music or opera, but I also play Broadway tunes and folk music. The midrange is mesmerizing. I'm yet to detect and weaknesses. On the contrary, these are immensely satisfying. The original owner of these speakers had died and his son was cleaning out the house. The old man was an audiophile who had been collecting speakers over a period of several years, so his son was left with more than enough to choose from. As a result, I got lucky.

Very accurate with great clarity.

None - but are they the best choice for video? Because I'm into video more than audio, I'm replacing my Infinitys in another room with a pair of M&K S-125s which are 4 Ohm.

I have Canton speakers which are predecessors to the Ergo 31 DCs - the 930s. The 930s are speakers which sounded great with my cheap 2-channel Scott amp which had been driving them. The Scott died and I'm in the process of getting a new 2-channel Yamaha amp (the AX-592).

I've heard the Ergo 31s and they sound great too. Top-drawer all around, especially for music, but I don't know if they're optimal for video.

All in all - a highly recommended speaker.

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In another room: Infinity SM-152s (mediocre). No comparison. Also, an M&K S-125C center channel speaker awaiting 2 S-125s.

Great Bas from small cabinets, quick, dry bas. Powerful and controlled sound.

Coloration! Lack of detail. Can't remove frontgrille.

Equipment used:
Pioneer PDS-904S (Cd)
Denon PMA 2000R (Amp)
Tara Labs Prism 55 (interconnect)
Supra Ply 3.4 (Speaker cables)
VM Blackfoot 60(Speakerstand, sandfilled)

I must say that my view of these speakers have changed drasticle through the years.
I no longer think that the sound is free from coloration, I must say that it is quite heavily colored at times. Listening to tracks like Nick Cave's "Plain Gold Ring", which has lots of bas, makes the sound so full of coloration that it makes the song totally unlistenable. Playing around with speaker placement doesn't help much. I placed my Cantons far from the walls, since putting them close to the rear wall makes the sound boomy.
The new Canton Ergo RC-K (more expensive model), seems to suffer of coloration as well, as showed in a recent Hi-Fi & Musik test (Swedish mag).
I also think that the DC technology, which helps the Canton's to bring lots of bas out of small cabinets degrades the detail level.
Sorry to put up another review, but readers must be warned. Strange that not many have noticed the flaws of these speakers, but I must add one more important thing.
Many of my friends think that I'm overly sensitive to coloration, but they mention they notice it as well with these loudspeakers.

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Too numerious.

Sound is surprisingly rich and enveloping. Very precise detailed speakers.

Given the price, I don't know of any.

I bought these speakers as an after thought for a second house. I had an extra reciever and wanted just a set of inexpensive speakers to match it. The reciever is an old Sony STR 80ES stereo reciever so I wasnt expecting much. I was shocked at the performance of these speakers. I can't stand muddy sounding bass heavy speakers. These were clean and detailed. The sound stage was excellent and my favorite female vocalists came to life. I listen to a wide variety of music from classical to rock to country to jazz and these speakers have performed well on all of them. They are revealing and bad source material will rot your ears. I have them on stands. Filling the stands with sand produced an immediate audible improvement. I have had a lot of positive commentary from visitors to my house on these speakers.

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Canton Karat M40s and Combi SC Sat sub system

Great full sound for a "bookshelf" speaker

Tried the B&W Nautilus 805's and didn't like em'! The Canton 32's had a much fuller, smoother sound. Better High/Mid/Low balance than 805's. Everything I was looking for in a speaker this size. Canton Ergo 32's get my highest recommendation.

I used to own Canton Karat 930 DC speakers. They have been replaced with Ergo 31 DC, an identical model. I thought these were the most neutral bookshelf speakers I have ever heard, with an extremely detailed, tight yet smooth sound. I fell in love with Cantons so much that I later bought a pair of Ergo 81 DC's and a pair of Ergo RC-L's. By the way, the grilles ARE removable on all these speakers; it is a little more difficult than usual. You can grab the grills by the protruding sides and gently pull it out in several places then remove it.

Well, I've had these speakers for almost a year and I must say that I'm very pleased with them. They produce a very detailed, dynamic, controlled and a sound that is almost free from coloration, that is even when the bas starts working and the bas is really good, controlled, dry and it goes deep, way deeper than I've heard other speakers going in this price-class/size. So the sound is really good, but the are some cons:
These speakers demands a really good amp, that is propably the only let down I can find. But use a good amp and place 'em well in your room and you'll be amazed, it's possible to get a lot out of these speakers.
The front-grille is a bit of a let down. It should have been possible to remove it for best sound, but unfortunaly it isen't. Let's hope Canton will fix this problem to the next-gen of Ergo speakers.

I was actually shopping around for a pair of energy speakers when i heard this ergo31 by canton. congrad to canton...beautiful speaker...one of the smoothest midrange i have ever heard in a speaker...the bass extension wasn't bad either...just need to make sure you get them up on a good pair of stands. I actually ended up buying the Energy C-2. They cost less...and worked like wild women in bed. but the cantons were nice too