2 ohm problem?

Ok, so I have a sony CDX-F7710 head unit.  I'm waiting for my local audioshop to get their new stock of 2ga wire, so while I was waiting I decided to conect my speakers directly to my head unit.  Originally I had 2 6"x9" JBL927 speakers in the back..and thats it.  I had no problems then.  Now, I connected my JBL GTO607C speakers, and If i play the music anywhere above 50% of its max loudness for anything longer than like 1 minute the head unit shuts off, then attempts to turn back on.  If i don't turn the music down it will continue in this cycle.  If I turn it down it plays again as if nothing had happened.  Anyways, I'm pretty sure there is no problem with the wiring...afterall all I did was add two speakers.  So all the speakers are 2 Ohm speakers...could that have anything to do with the problem?  (My amp is 2ohm capable, so once its connected I hope I wont have any problems)

Head units aren't SUPPOSED to run 2 ohms, let alone two PAIR! And if you are planning on running all of those speakers on one amp, you are going to either be running 4 ohms or 1 ohm... I hope you keep this in mind when you connect your amp, but for now, the deck is seeing either an overheating condition, or possibly an over-current condition, THAT'S why it's shutting down.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

The amp I will be running is a 4 channel JBL amp.  I am not at all worried about that.  I know it will work fine.  The other thing, on my component speakers box (GTO607C) there is a picture with a headunit, 4 ohms, and a check mark.  Indicating that it can be connected to the head unit.  Anyways, thanks for your info.  I thought it was because they were 2 ohm speakers, and I'm right.  I just can't wait to for my 2ga wire.

Ok, so the last comment got me wondering a little.  The amplifier I plan on using is the JBL PX300.4  Rated at 169W RMS x 4 channels at 2 ohms, 14.4V supply and <1% THD +N.  Ok so its rated at 169 W x 4channels.  at 2ohms, does 2 ohms mean per channel or the overall resistance of all 4 speakers?

Per Channel

Perfect! Thats what I thought.  Thank you very much.  You put my worries to rest.