My system installed in a '96 Ford Explorer 4 dr.

- Nakamichi CD-35 AM/FM CD player (35wx4, 0.1% THD internal amp; single
set of preamp outs)
- Rockford Fosgate 4600x 4 channel amp (30wx4 20-20k Hz, 0.08% THD)
- 4 ea. Boston Acoustics 5x7/6x8 speakers (all mounted in doors)
- Bazooka EL8A amplified (50w) tube sub

Each channel of the sole set of preamp outs from the Nakamich head unit
is split (using RCA y-splitters) and then fed into the Rockford 4
channel amp (one set rear, one set front). The Boston speakers are all
run off of the Rockford amp...fronts off one set of speaker terminals,
rears of the other set of speaker terminals. The sub is also attached
to the rear speaker terminals on the Rockford amp, sharing those
terminals with the rear speakers. The front crossover card in the
Rockford amp is set to high pass position (100 HZ cutoff) and the rear
crossover is set to full range in order to get the full bass response
to the sub. I get LOTS of volume out of the sub in this configuration.

Someone has suggested that I might get better sound out of the sub if I
were to attach it to the NAK head unit's speaker leads instead of
attached parallel (or is it in series?) with the rear speakers off the
Rockford amp.

Anyone have any comments or other suggestions?

TIA!
Bob