Thanks ditusa...
Very good article that seems to detail and explain well my own bad experience with a SINGLE subs added to my system... I sold it because i was not prepared for this task at all ... :) In the mean time i learned room acoustic and i discovered why connecting a single subs is a bad idea most of the times if done without any help....
Now my headphone goes under 30 hertz i dont need subs...
This article is very good :
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Understand that the largest percentage of all audio issues is room acoustics. You cannot put a great speaker in a marble shower stall and expect it to sound good - it will sound like a speaker in a marble shower stall. Room acoustics itself is a very complex set of interactions of physics and perception.
Sadly, there are many instances where manufacturers or individuals skew the relevant terms and confuse people. For example, beware of (and be aware of) the dangerous term "Room Tuning". You CANNOT tune a room using an "equalizer". You are tuning THE SOUND SYSTEM with the equalizer - the room is still the same. REAL room tuning means anything from sticking pillows in the corners to rebuilding the room (perhaps correctly) from scratch, incorporating a set of acoustic devices and parameters which sometimes seem nebulous but get a desired result. Because of this nebulosity of all the acoustics terminology (not to mention the international differences in measuring techniques, terminology, and ’scales’, which are substantial) it is often difficult for an end user (and many audio professionals, for that matter) to be able to mentally visualize just what a room without standing waves will sound like, or a room which is so rolled off that the high frequencies seem to "fall to the floor". »
What he wrote is so true, understanding it i rejected the idea of using an electronical equalizer first and instead designed my own room MECHANICAL tuning... First i used passive treatment with a balance between diffusion/reflection/absorption... After I created my audio room with one hundred Helmholtz resonators tuned incrementally on 6 months period around my listening position and the speakers ... I called that : "a mechanical equalizer"... The results were stunning.... No speakers at any price can beat the room...And a good room easily beat most of the times any speakers at any price in a non dedicated room...
By the way half of the issues and problems with headphones are related to the shell acoustic relation with the driver and the acoustic content of the shell or lack of...Something headphone marketing never adress, because to sell a product you dont point to the problems but to false solutions : improved driver with a thinner membrane for example... It is not enough to have a good driver, all my past 9 headphones had good drivers, none had acoustic content and device in the shell/cup, save one... The only one i like... AKG K340...
