Originally Posted by Ettepet
Ferenc, how do you compensate for the somewhat uneven frequency responce of the SM60F's in your stereo setup? Where Ivan tells us how easy it is to detect (sub) 1dB differences between speakers the FR of the SM60F's fluctuates 6-7dB in many frequency ranges. The SH50 seems more controlled in that respect.
It is one thing to easily detect a dB difference in level between 2 like cabinets.
Is is quite another to hear differences in level in freq response.
I do sweeps all the time (as in hundreds/thousands of times when working on a design) and cannot hear the peaks and dips in the response. Unless they are quite large or wide.
Unless there is something really wrong, there is no way I could listen to the sweep-or noise of one of our loudspeaker and even come close to drawing its response curve-excpet maybe the low freq rolloff.
That is not saying that you won't hear a difference between two slightly different freq responses. You will-hear a difference. Unless your ear/brain system is very very good (mine is not in that regard), you will not be able to tell me what the difference is (ie 2Khz is 2dB down about 1/4 oct wide). Only that you hear something different
When the cabinets are the same, you simply don't pick up on that.
Now if you are playing a single tone and changing the level-THAT is when you can tell the difference.
I be you would be quite surprised as the reponse of many "better" quality loudspeakers, if they were measured in the same detail as the Danleys.
If you even get a response curve at all-it is usually heavily averaged and with few data points-making it "look" much smoother than it really is.
We show you the "ugly truth" as it were.
There is also a lot more to the "sound" of a loudspeaker than the amplitude response. Although is usually the most you get from anybody.
My experience is that the ear is much more forgiving of amplitude than it is of phase/time response.
You almost never see phase response graphs (except from us). It is a WHOLE LOT harder to get the phase correct-especially in more than 1 listening position.
It can be relatively easily done for a single spot-jsut don't move even a couple of inches. Then because the drivers now have different path lengths to the ear the sound is different. YEs even small parts of an inch can have huge effects on the sound.
Try this for a fun experiment.
Take 2 single cone loudspeakers ( 3 or 4" in a small cube box works-but they could be out of the box or a sealed back midrange or whatever you have) and play some pink noise or white noise into both of them
Both speakers are hooked to the same amp channel-so they are getting the exact same signal.
Place them either side by side or one on top of the other-with the fronts lined up. You can be pretty much any listening distance away 1M 5M etc
Now have a friend move JUST ONE of the loudspeakers back a little bit (like 2inches)-while the noise is playing. Did you notice a change in the sound? Now move it back a littel bit more-see how the sound changes again.
As you get 2 different sound arrivals to your ears, the response changes.
If you were to move your physical listening position to where you ears were the same distance away from both drivers (as when the expirement started) you would get the same sound as the origional again. But when the loudspeakers are placed back in the origional position, the sound will change.
That is what happens when drivers are spaced on the cabinet front or in space.