help with car amps and subs??, help!!! Options

[cyb593]

i bought these 2 audiobahn 400 watt amps and i am trying to find a good amp well i think i found one but i am not sure how it will work can someone help me the amp information is:well down bottom it says 1x800 watts rms does this mean that the amp only puts out 800 watts. this questions might seem stupid but i am new at the audio thing. and also will my radio and regular speakers run off the amp or will they stay the same like they are. will i need more watt for the speakers and the head unit??sorry i am an idiot about this stuff i never really wanted to mess with to much audio till now. also one more thing will this amp suit what i need??


Audiobahn A8002T 2 Channel 1600W Amp
Class A/B MOSFET Power Amplifier
2 Ohm Stereo Stable
MOSFET High Speed Switching Power Supply
Non-Regulated Power Supply
Double Sided Epoxy Circuit Board
Air Induction Fan Cooled
RCA (Low Level) Inputs
Speaker (Hight Level) Inputs
RCA Outputs
Variable High Pass Crossover : 50Hz - 750Hz
Variable Low Pass Crossover : 50Hz - 120Hz
Variable Subsonic Filter : 20Hz - 50Hz
12dB Crossover Slope
Signal to Noise Ratio >100dB
0.02% T.H.D.
18dB Bass Boost
Bass Boost Control On/Off
Phase Shift 0° - 180°
1/2/3 Channel Operation (Mixed Mono)
Tri-way capable
Soft Start Circuitry
High Gloss Chrome Plate Finish
Blue Illumination
4-Way Protection Circuitry: Thermal, Short Circuit, Overload, DC Offset
30A x 2 Fuses
Dimensions: 11-1/16"W x 1-7/8"H x 11-7/8"D
2 x 200W RMS @ 4Ω
2 x 400W RMS @ 2Ω
1 x 800W RMS @ 4Ω

[cyb593]

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...me=STRK:MEWA:IT

this is the amp i thinkin about?? will this work for my subs and for my head unit and speakers?? if i buy 2 of these or what kind of rms will i need for head unit and speakers??