montclair

I am new no flaming please.I hope this the right area for this
I need to upgrade the tsx amplifiers and speakers ,I am using older hifonics from my mazda for the fronts and rear door. the sub shall have its own amplifier.The install shops tell me that " clean sweep , or something along that line are required to install the new amplifiers and bring back lost sound " I realize this is not a requirement since the HU in the TSX is fine and the major problem is the balanced outputs, molex etc. Being in the Edmonton area the problem is all the shops seem to believe that a clean sweep is required . Hence I am here . From reading I know a balun adapter will work - I have found 2 links and would like to know if anyone has used these or if they shall work or any other ideas.

http://www.pac-audio.com/productDeta...&CategoryID=28

and

http://www.autotoys.com/x/product.php?productid=10770

As an aside this occured in one of the stores I went to in the past my son (at the time was about 12 or so ) . We into one of these stores and I noticed a square subwoofer - I enquired and was told I would not appreciate the "good sound" from this -the boy looked at me and said is he serious dad?
This was an interesting comment to both of us since I had two door mounted subwoofers in my 1987 aerostar and 2 *10 inch in the trunk of my 626

thanks .