@amir_asr
Forget everything we have been discussing here. If you are not measuring your room and correcting for bass errors, you have a lousy audio system. Period. Measurements will absolutely show that the acoustic stuff you have thrown in there have little to no impact in this regard (don’t be fooled by the name "bass trap, " they do no bass trapping).
Ok, there I have to disagree. I think a statement like that is unhelpfully dogmatic.
You could make the point that measuring will help show bass response deviations from neutral, and that these can be corrected for if you want a neutral bass response.
But...one can also get a fairly smooth bass response by ear. Not as accurate as an instrument, but it is the ear, how we perceive the sound, that one can care about pleasing. Remember: there’s little point in caring about things you can’t hear. The point of addressing bass nodes is that you can hear them. Which means you can hear them without an instrument (even if not as precisely quantified).
So one can experiment with speaker/listening positions, with test signals or well known tracks, to hear when a bass node or dip may be intruding on the sound. If a bass error response is something you can’t notice, or it occurs so infrequently that it rarely infringes on your enjoyment of the sound, then big whoop.
I haven’t used measurements in my set up. Is there some bass node somewhere that would show up in measurements? No doubt. Does it regularly stand out in some deleterious way? Nope. I’ve heard many of my test tracks (which include bass torture tests for tightness/depth etc) on systems that have some correction for room response (e.g. numerous times with the Kii Audio 3 speakers) and the bass I hear at home is similarly smooth. (I did at one point have subwoofers and room correction for the bass - it wasn't much smoother to my ears than what I'd achieved without the correction).
And declaring any system that wasn’t arrived at with measurements and room correction to be "lousy system" is a subjective opinion - nobody need take your subjective opinion as the basis for what they want in their own system, or in place of their own goals or judgement.
I suppose it’s quite possible if you listened to my system at some point you might hear a room interaction that could have been fixed, and then declare it "lousy" by those standards.
But by the standards I seek it’s wonderful, and by the standards of what my guests experience when listening - joy and astonishment, I’ve had people moved to tears - well, if that’s "lousy" I’ll take "lousy." ;-)
Cheers.
