What would happen if I got an extra head unit for the back of the van and connected it to the existing speakers including the sub and "switch the sub on" lead. I'm not daft enough to switch them both on at once though I bet it wouldn't matter if I did. I know I could get a remote but I don't want to. Ta muchly.
used to have mine on a slide mount with the speakers paralleled up and just took it out the front and put it in the back. Dont think anyone does slide mounts anymore.
I know. Can't change CD's. Not that I have any CD's. I was just thinking about it and wondered if anything bad would happen.
Or would be easy if your speakers all run from an amp with dual rca inputs, or just use splitters - or Y fly leads.
They don't though - head unit built in crappy amp supplimented by a 10" sub and mono amp. The question is, if I play music with one, will the electricity go up the speaker and sub input/auto on and fry something. Electric's is not my best subject...
I wouldn't power, potentially, the same set of speakers from two drive units. For a start, your impedances will all be to cock if they're both connected, even if one's switched off. If you must, why not put a double-pole amp selector switch in? Power amps can handle an open circuit, but being connected to the output stage of a second amp may cause gruesome things to happen.
Theres a good chance of damaging something or getting the sound quality affected if you wire both heads up to speakers at the same time. If one of the head unit has an aux input (the front one) and the other (rear) has line out capability you could do it that way, ie feed one head unit with the other, but the volume control may not be optimal, I am not sure how the volume control would work on the slave unit, or you would have to go the the front to change the volume. Might be ok for small changes in volume though.
Cant see that it matters even if you have both on Both on playing different tunes might screw your head up especially if you have had a few drinks . The sound quality might be effected but at the end of the day its in a metal van so sound quality is on a loser already.
Speaking as an electronic engineer: With high power head units (more than 7 watts a channel) both speaker wires are connected to an amplifier output - neither wire is an earth. Depending on the design of both head units, the following can happen: one unit off the other one on - the unpowered unit may cause distortion (sucks power sometimes) and possibly be damaged. both units on - the silent unit may either mute the active head by trying to enforce 'silence' or cause distortion. Or simply blow fuses. Best off is to feed line out from one unit into aux in on the other unit. Depends on the design as scote says on whether the volume controls are in series. Or combine line out on two units with resistors and connect to line in on a separate amplifier setup. Or go the Bluetooth route - the phone volume control controls the music volume as well as the head volume on my Sony £99 MEX3900BT, and you dont need a remote. Plus when someone phones you , everybody can hear the call. Or use a walkthrough bus so you can reach the head unit in the front anyway.
