Cewin Vega speakers Help ???

[KingRadicalPhil]

My father owns a Onkyo tx-sr705 ands has some older Cerwin Vega speakers her are the model numbers for his speakers it is a 5.1 setup

Fronts=RE-30 Towers
Center=HT-CTR Center Channel
Sourrounds=LS-8 Bookshelf Mounted
Sub=Klipsch Sub-10

SO I went to his house and set them up for him and I set the Fronts medium sized Backs Small Center medium. The Klipsch Sub is set to large and handles most of the bass little in the front and little in the back we find the setup to sund very good now he wants to add Two Klipsch Bipolar s-3 surrounds what do You think