I was thinkin bout buyin a planet audio ac2600.2 car amplifier but cant find what gauge power an ground wire it takes and how many watts it puts out 2 channel @2ohms rms. can you help?

Considering the amplifier specifications, that can be checked in this catalog:

http://phaseonedist.com/Car%20Audio/Catalogs/2011%20Planet%20Audio.pdf

the maximum RMS power delivered per channel is 1300 W @ 2 ohms, for a total 2600 W. Although this "2 ohms" specification refers to the impedance and not resistance of the speakers, for a quick practical calculation, let's assume they are equivalent. So, for the given data, the maximum current flowing through each speaker would be:

P = R x I²

1300 = 2 x I²

I² = 1300 / 2 = 650

I = ?650

I = 25,5 A per channel

So, both channels would be requiring a current flowing from the amplifier to ground of around 51 A.

Considering that the rest of the amplifier circuit uses some power for its own functioning and part of it is also dissipated in the form of heat, let's make a guess that it need some 10% more more current, what would give us some 56 Amps being drawn from the car battery/generator power system. As you will be using it inside a car, let's assume the temperature under the hood can be around 60 ?C and as the car is not that big, we will not need to consider voltage drop in the cable.

The ampacity chart for AWG wires and cables (http://wiki.xtronics.com/index.php/Wire-Gauge_Ampacity) indicate us that an AWG #6 wire would do the trick, for both the positive and negative leads. If you want to give an extra safety margin, you could use AWG #4 cable, but I think that would not be necessary.

Hope this info can help you!

Here are your specs. RMS 900 Watts Nominal and Max 1300 on 2 Channel @ 2 Ohms.
4 Gauge should do fine but if you like to feed the beast go with 2 gauge.
Looks like going rate is $110 on Amazon or elsewhere.
If it attains the RMS wattage it would be a good amp. I like monoblocks but
you will pay more. I looked into Tri-Mode and it is straight forward but people
are having problems figuring it out. With your 2 speaker operation you should
avoid the issues others are having.
Good luck and remember, rearview mirrors were meant to fall off!
Mine: JL 1800A monoblock into 2-JL 12" W3's in series for low bass 20-80 Hz; Lanzar Vibe 266 bridged into 2-12" Memphis in series for mid bass 40-200m Hz. 2 guage wire to mononblock-250 amp fused at battery, 4 guage to Vibe w/250 amp at battery.

Anarchy Series 2-Channel Car Amplifier

• RMS Power Rating:
  • 2 ohms: 900 watts x 2 chan.
  • Bridged, 4 ohms: 1800 watts x 1 chan.
• Max power output:
  • 2 ohms: 1300 watts x 2 chan.
• Total Power Output: 2600 watts
• Pulse width modulated MOSFET power supply
• Convenient remote subwoofer control
• LED power (green) and protect (red) indicators
• Variable Bass Boost 0 to +18 dB
• Bridgeable Tri-mode operations
• Chrome-plated connections enhance durability
• Variable high and low pass crossovers
• Illuminated logo
• 3-Way System Protection circuitry (thermal, overload, and speaker short protection)
• Dual speaker terminals simplify the hookup of multiple speakers
• Heavy duty aluminum alloy heatsink for extreme heat dissipation
• Low level high inputs
• Heavy-duty set-screw terminals
• Input sensitivity:
  • Low level: 100mV-2V
  • High level: 2V-8V
• Variable high-pass filter (45-90 Hz, 24 dB/octave)
• Variable low-pass filter (50-500 Hz, 24 dB/octave)
• Damping factor: >125
• Signal-to-Noise Ratio: 102 dB
• Frequency response: 20-20,000 Hz
• Dimensions: 15-9/16"L x 10"W x 2-3/16"H
• 1/0-gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits when purchased together with this amplifier.
• 1-year Manufacturer's warranty