Re: Speakers extremely quiet st full volume
Yes, 5 Watts RMS is not going to be loud at all with a speaker that is not that sensitive.
For cheap head units, I like to use the Pioneer DEH-1100 or 1200. You can get them for around $60 New..14W RMS x 4. Some Kenwoods are around 22W RMS x 4.
Otherwise pick up a 50W X 2 (or more) amp to power your speakers with.
'65 VW Bus
MA Hippo 122, (2) Aura Sound 8's, (2) SoundStream 6.5 coax, (2) Alpine Type-S 6x9's [rear fill], MBQ DSC1500.1D, RF 501X
'02 BMW 330xi (AWD coupe), every option
Harman/Kardon 12-speaker System Option + Dayton HO D4 10" and PPI Ion 650.1 in sealed box
And many more car audio goodies in storage