First, I'm not criticizing Canton speaker as a whole. I'm sure they sound great, but I'm a little leery of the frequency response specifications.
As an example, the Ergo 620 is 33...40,000 Hz,
which is pretty darn good for a bookshelf speaker with a single 180mm (7") woofer in a modest sized cabinet.http://canton.de/en/hifi/ergo/produkt/ergo620.htm
However, if we look at this frequency response graph from a review in Home Theater Magazine
, we find a very different story -http://www.hometheatermag.com/compac...em/index3.html
From their tests, we have - "The –3-dB point is at 62 Hz, and the –6-dB point is at 52 Hz."
That doesn't look even remotely close to the stated 33hz. In fact, using the graphs, response is down about -25db to -30db at 33hz.
I'm finding this true on other tests for Canton speakers I find.
For example, the Canton GLE 470 rated by Canton at 25...30,000 Hz
with twin 7" woofers -http://canton.de/en/hifi/gleserie/produkt/gle470.htm
However, this test again gives very different results -http://www.ultimateavmag.com/speaker...em/index5.html
Interpreting the graph using 90db as the zero reference line, -3db is about 55hz, and -6db is about 48hz. That is a far cry from the suggested 25hz specified on the Canton website.
Though they are probably using peak reading rather than average, the reviews state - "Effective bass extension (-10dB): 43Hz (relative to the level at 150Hz)"
I personally think -3db and -6db from the average reading across the frequency range is more than fair.
This makes me NOT trust the Canton frequencies response specifications.
On first look, the spec look absolutely stunning. The Canton Ergo 655 Center speaker has a claimed low end of 26hz, which would imply this would also make a great front speaker, even a great stereo speaker. But given the tests I'm see on other Canton models, 26hz probably means 56hz, which is tolerable, but not great.
Based on what I'm seeing, you should add about 30hz to the low end spec to get the real functional low end rating.
Now, if I can't find trusted, fair, standardized specs on these speakers, how can I even consider buying them?
Can anyone shed some light on this????