Is this digital or mosfet?

Yes if I know what their problem is and if not I'll let them know to reach out to stereo shop or a friend whose more knowledged as an Electrical engineer and stereo professional at competition level.

What gauge wiring will I need to connect this amp to my truck?

I would use at least 8gauge. Prefer 4 gauge

Thanks for your question. Power (watts/ch) 4 Ohm Stereo: 65 x 4 Power (watts/ch) 2 Ohm Stereo: 90 x 4 Power (watts/ch) 4 Ohm Mono: 180 x 2 World Wide Stereo – since 1979 – and a proud authorized Kicker dealer.

Will this amp work with 2 kicker cs 6x9 and 2 4x6 kicker ks?

This amp all work but its best to go with more powerful amp so you can keep the power gain down and still have power and the amp will never get hot as in 1 turned up for power with heat up. Kicker is the best amps on the market right now for reliability and true power!

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KICKER46CXA3604 CXA3604-4x90-Watt 4-Channel Full-Range Amp

KICKER46CXA3604 CXA3604-4x90-Watt 4-Channel Full-Range Amp

Product ID: 178666465

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Details

Voltage
40 Volts
Manufacturer
Kicker
Maximum Supply Voltage
40 Volts
Minimum Supply Voltage
9 Volts
Mounting Type
Surface Mount

⚡4x90W Class A/B power

🔊6dB KickEQ bass boost

🎚️12dB variable crossover

Description

🎵 Unleash your sound’s full potential—because average audio is so last season.

BUILT TO LAST - Backed by a 2-year warranty and legendary KICKER reliability, this amp is your long-term sound partner.
TAILOR YOUR BASS - Dial in your vibe with a 6dB KickEQ bass boost and a 12dB variable crossover for that perfectly sculpted low end.
WIDE VOLTAGE RANGE - Works seamlessly from 9V to 40V input, ensuring consistent performance no matter your ride’s power system.
POWER MEETS PRECISION - Deliver crisp, full-range sound with 4 channels pumping 90 watts each—perfect for audiophiles who demand clarity and punch.
FLEXIBLE INSTALL BOLD STYLE - Show off your setup with vertical or horizontal mounting options—because your amp should look as good as it sounds.

The KICKER46CXA3604 CXA3604 is a discontinued yet powerful 4-channel full-range amplifier delivering 90 watts per channel with Class A/B power. Featuring a 12dB variable crossover, 6dB KickEQ bass boost, and flexible mounting options, it offers precise sound customization and reliable performance backed by a 2-year warranty.