How can I power 4 speakers with a 2-channel amp?

If I replaced my stock car speakers with Focal Access ones, do I need an amp to power them?

• I have an 05 Ford Escape using the stock speakers along with a 12" sub powered with an amp. I've been thinking about replacing all my stock speakers with Focal Access 570CA1's. If I did this, would I need to install a new amp alongside my existing one to power the speakers, and if so, how big of an amp should I get? Or should I just replace the amp I already have to one that can power everything? Thanks in advance.

• Answer:

  they will run off your stereos internal amplifier but its best to pick up a 4 channel amplifier to run these bad boys.all you need is a distribution block to give you another place to hook up a second amplifier.all you do is find out the RMS rating on each speaker and find an amplifier that is a match for RMS to what each speaker can handle.a 4 channel amplifier will give you an RMS rating per channel and a match from speaker to each channel is what your looking for or close to it but not over it..take a look on eBay/car audio then amplifiers.nice set of speakers an amplifier will get the most from them.rockford fosgate has just came out with a 300.4 and its 75 watts per channel at 4 ohms.take a look on youtube.com at big d wiz and his car audio videos he shows this amplifier.its for sale on eBay new for 188 dollars and i hear it hammers its one of there newest amplifiers out there.hope this helps.this is a very small amplifier and will fit very easy any were in your ride. its the PBR 300.4 eBay then the id number110804754932 and this is the cheapest ive seen it.this is a good deal.150 dollars.this amp has the new boosted rail technology.good luck with your system.have all rockford fosgate equipment and it hammers.