sub and amp.... please help

[Neil9N]

I am thinking of purchasing a Kicker subwoofer and Directed amp that are both on ebay.

Now the sub says:
Size: 8"
Impedance (OHMS): 4 DVC
Max Rec Amplifier Power (WATTS PEAK/RMS): 1800w / 900w
Sensitivity (dB 1W/1M): 84.5
Frequency Response (Hz): 28-100k
Mounting Depth (IN.): 4-11/16

So does this mean i have to run with from the amp at 4OHM???

Because the amp spec says this:
RMS Power Output:
• 300 watts x 1 chan. @ 4 ohms
• 400 watts x 1 chan. @ 2 ohms
• 600 watts x 1 chan. @ 1 ohm


So can i run that sub at 600watts x 1 chan. @ 1 ohm or do i have to run it at 300 x 1 chan. @4 ohms.


Weblinks for the sub and amp below:
Sub..... http://cgi.ebay.co.uk/KICKER-SOLO-BA...QQcmdZViewItem

amp..... http://cgi.ebay.com/ebaymotors/NEW-D...spagenameZWD2V

Cheers. Neil