twin amps and 6x4 front door speakers

[mentalmoshio sophs V8i]

if the stereo only has only 1 pre out is it possible to use 2 amps using one wiring kit .

fancy one 2 channel amp for subs and and one 4 channel amp for 4 6x9s

also has anyone fitted any 6x4 to the bottem of the front doors

[Damonski]

Hiya,

You certainly can, although on multi-pre-out head units you'll be able to fade front/back and control the sub level. Certainly the case on my Sony M770R

Just split the single pre-out using suitable phono Y connectors to the necessary amps. then you'll have to adjust the levels on the amps themselves to get the balance right. 

I put 6x9 in the front doors of the tdi, I just made some MDF frames up and fibreglassed them to a smooth appearance, attached these to the doors, not the card itself and then modified door pockets to fit around later on.  Took a good couple of weekends to finish, but the sound was awesome.

[stuntman]

Buy a second hand decent head unit, that should give 3 pre-outs

[Range Rover Blues]

I used splitters on the phono outputs on mine, the inputs to the amp should be high impeadance so take very little current.

Also look out for bridgeable amps, you connect a sub between (IIRC) the positiveof the RH and negative of the LH, giving about 4 times the power.  If you use a low-pass filter you can then wire up the subwoofer and 1 pair of speakers to the same amp, the ultra low frquency then goes to the sub and doesn't force the mid range speaker to clip.

Maplins used to do a mint 4 channel amp for well under a ton, one pair of outputs had adjustable treble fade and the other adjustable bass fade (both switchable) so you can keep the bass outof your tweeters and the treble out pf you sub which saves the low pass filter if you only fit the sub to that pair of channels.