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Ideally you make a Low Pass Filter and Drive another Seperate Power Amplifier for it. This amp should Also be Higher Power as BASS Requires LOTs of Power.

It is also should also have a Mixer before the Low Pass Filter so it Contains the sounds from Both Left and Right Channels.
 
monkeytree said:
i should have said without the extra amp

Never going to be very easy! - for a start you need a special dual voice coil speaker, and passive crossovers. This is likely to cost MORE than a conventional speaker and amplifier - and not perform as well.

As already mentioned, you need more power for the sub-woofer, so by doing it passively you're drastically reducing the power to the other speakers.
 
monkeytree said:
could it jus be briged to mono?

Sorry?, I don't really understand what you're asking?.

If you're running a seperate amp to feed the sub-woofer you could use a two channel amp in bridge mode to get more power in to a higher impedance.
 
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