what is better for SQ a DVC 4 ohm or a DVC 2 ohm sub ??

 

The impedance of the sub has nothing to do with it's SQ. The SQ is determined by the combination of the sub and it's enclosure.

 

I agree with you 100%, but what about the W7? When JL Audio was asked why a single 3 ohm voice coil, they said that they did not want to sacrifice ANY SQ.......................... what?!?!?!

 

If the good folks at JL can hear the difference between subs in a test where the only variable is the impedance of the sub's VC's I'll kiss their ***.

 

heh heh heh Get to smooching !!!! hehehehehe
http://www.jlaudio.com/subwoofers/w7faq.html Question #2 & #3

 

I don't know about that. My guess is JL just wanted to be different. Like the way they made the 13.5 inch W7 instead of a 15. VC's might make a difference in sq but maybe only in high end home audio gear.

 

wow it's funny how they made the sub a 3ohm DVC and well look at that.....their amps would be perfect for it since they put out max power at 1.5ohms. sounds to me like they just want to sell you an amp with that sub and make even more money off you.

 

I am guessing that the reason they chose the 3 ohm coil was to keep the inductance down a bit. It has a relativly long coil as it is (that contributes to its healthy power handling), but i am sure that they tried to keep the inductance down by having less windings. I am not sure how many layers the coil has or the length, this is all speculation.

 

speaker impedance was made for wiring the sub not sq. Say with dvc 4ohms you can get an 8 ohm load or a 2 ohm load. Now add another sub and you can put both at 2 ohm and get a 1 ohm load or 4 ohm load between the two. DVC's were made to give the users a wider range to use their speakers with more amps.