The beauty and character of goog of SQ
1. the singer seems to be singing in front of you, every musical instrument sound as it is
2. accurate sound reproduction in terms of tonality, sound staging(width, depth, height), ambience, imaging, linearity,
dynamics

yes ckmoy007 i agree with you...but i think there's nothing perfect. Every individual has their own preference and as for me i trust my ear and all my ICE is DIY.
Basic thing in ICE is that...it is a combination of science and art of the system. Knowing the stuff we have and how we tune it corretly (based on frequency output it will produce) and also placement of every component in our car.
Of course my stuff will not sound like it is if i put it at other car...
The current technology and development in ICE world has improved a lot where some HU has time aligment and built-in crossover where can discriminate what i said above...

what i said is just my opinion and not necessarily fit to others