I have recently had
a new sound system and have rear speakers in the rear side panels.
They are likely to rattle and make the sound awful but there is
an acoustic material called DYNAMAT
that sticks onto the back of the panel and deadens all the vibration
and unwanted noise. It has the added bonus of improving the speaker
performance also. It will set you back about £10-£15
for a roll to do both sides. I can recommend it as mine sounds great
I also fitted an alpine amp (used for 1 output) and a sub in the
back. I chose a small box for the sub so I don't loose much space.
I was worried It would spoil the sound a little , but again I can
recommend it as it actually sounds good.
The amp is quite small and fits in the side locker out of the way
of kids feet and wet dogs! There is more than enough space around
it to vent the heat. (I still have to find a suitable grille for
the sub to keep the dogs wet nose off it but in the mean time it
is still removable).
In the front I fitted a couple of good quality 4" component
speakers (Audiobahn) to replace the Toyota ones (they came to £60+vat
because they were a bit difficult to size correctly so the choice
was limited) and a couple of tweeters on the dash.
A good quality head unit will have a band pass filter to let you
switch off the lower frequency bass to the ordinary speakers and
let it all go to the sub instead. That stops any unwanted distortion
when the volume us up.
I used a Pioneer with MP3 Playback. The plastic blank was made
for a Celica (Halfords part so a bit of a rip off) but can be trimmed
to fit and looks tidy.
The only snag I have now is how to stop the rear view mirror from
shaking in time with the music...!!
The bottom line is that you can fit rear speakers successfully
with the help of under £20 of dynamat and it does improve
the sound dramatically having the extra speakers.