I have a Pioneer AVIC-Z120 BT that has a built in 4-way 50 watt amp and I want to change out my factory speakers and put in component 3-way speakers up front. The folks at the stereo shop are saying that the Pioneer is too underpowered to drive these speakers efficiently? I said that I thought 50 watts would be more than enough power but they are telling me that it is a waste as I won't be getting nearly enough bang for my buck. I'd appreciate hearing an unbiased opinion. Thanks!