Do I need an amp for my car audio set up?

[t12341]

So I am going to have 4 Polk Audio db651s speakers that have 6-55 watts RMS. I will also have a Pioneer FH-X700 BT stereo receiver that puts out 14 watts RMS and 50 watt peak. Would I need an amp?? or would a 4x50 watt RMS 4 channel amp work or would I need the 60x4 RMS watt one?

Thanks