Adding additional 6x9’s and a sub

 I have a question, well several, about adding a separate amp and speakers to my system.

Right now I have a Clarion dvd headunit that has 3 sets of preamp outputs and a separate 200x4 amp running 4 6x9's. I want to add another 4 channel amp to power an addition pair of 6x9's and a sub.

I know very little about wiring and am on a learn as I go basis. So, my first question is can I run run the new 6x9's at 4ohms off the new amp and run the dvc sub bridged at 2 ohms off the same amp? And, if so do I need a tri-way adapter/crossover? I don't know much about them and have only seen ones for 2-channel amps. [Also, if I run a dvc 2ohm sub bridged at 1ohm will it hurt the amp?]

My second question is can I get away without a separate capacitor. The amp I have know is 200watts total and the additional one will be 110x4 at 4ohms.Or if this is an acceptable way of wiring it 110x2 at 4ohms for the 6x9's plus bridged to 220x2 at 2ohms for the dvc sub. This should be a total of around 640watts.    

If anyone can help me I would greatly appreciate it. I figure it's not a good idea to learn by trial and error. 

What's the brand & model number of the subwoofer?  And what about the amplifier?

If your sub has two 2-ohm voice coils then you can wire them in series for a single 4-ohm load.  Bridge the 2 rear channels of the 4-channel amp, to power the sub.  Use the 2 front channels to run the 6x9s@ 4 ohms stereo.  If the sub has two 4-ohm voice coils then you'd have to wire up a voice coil to each channel, but the signal input would have to be mono because both voice coils have to have the same amount of power and the same signal going to them.  But then if you give the amp a mono input you lose the stereo sound for the 6x9s.

Some amps have separate sets of RCAs though and you might be able to make such a setup work, depending on what kind of amp you have and what features it has.  Even then though I would not really recommend it because wiring up each voice coil to a separate amplifier output channel is usually kinda tricky to do properly, and if you do it wrong you can drastically reduce the lifespan of your sub.  You'd be better off sticking to a DVC sub with 8 or 2-ohm voice coils, or just a single 4-ohm SVC sub

Thanks for the advice. I guess I will go with a 4ohm  SVC sub and just bridge the rear channels.

I 'm just about to buy the amp and sub online so I'm glad i got a reply.