Here's a MB Quart model that while not tecnically meeting the 6 channel objective, it could do the same thing (it's 5 channels)MB Quart
I'm in the process of upgrading my BMW E46 sound system. The carputer is already in place and the HU as well which is an Alpine CDE-9873RB. The HU can't be moved or changed due to the fact that I have separated its faceplate from the rest of the unit using cat7 cable. It does have the essentials which is good quality, low noise 4 channel pre-amp, aux in. The alpine unit has replaced a Kenwood which had a terrible pre-amp output & sound quality.
More info about the install at my BMW Mod site under mods, carputer install.
I would now like to hook the HU with a 6-channel amplifier, to drive the car's 4 speakers and use the remaining 2 channels to drive a sub, which will be enclosed in a custom fiberglass enclosure on the left lining of the car's trunk.
I have already completed all the necessary audio wiring, heavy duty 4AWG wire, gold plated positive/ground distribution blocks etc.
I need your opinion for amps under £200.
I've already found this:
JL Audio A6450
I also found some JBL amps but I haven't heard good reviews about them.
and yes I did search!!