Use seperate motor controllers , one for one pair and another for the second. Speed controllers are pulses of power at a given frequency. Two motors in parallel probably would be out of phase. Controllers are 15 bucks just spend.the extra money. ;)

hi jstarne1 thanks for the reply

if i use 2 http://www.robotgear.com.au/Product.aspx/Details/462 one for each RC channel

then 2 dc motors per 462

or is my logic wrong. remember i am new to all this

Your link only went to their homepage. But I did look around for Somthing ideal for you. The Dagu rover 5 controller is specific for 4wd robot , 4a per channel and has individual inputs and outputs ( thats what you need to prevent phase issues/ feedback). It did look reasonable for price.... http://www.robotgear.com.au/Product.aspx/Details/555

Hi Jstarne1 thanks for the help

:D

hi

would this work ?