Will this fit under the front power seats of a 2008 F250?

Not sure about this particular truck, but it does fit under the front seat of my 07 Tundra. Sounds great too !

Can two subwoofers (one under driver seat and one under passenger seat be used with a factory head unit? if so, will it require any additional items?

Honestly one is plenty but if you want to double up on it your gonna need to wire a lot of things

Can you hook 2 together. Is ther a special harness you need. Thank you

You can split the input signal in two. You would DIY a harness.

The om says, the auto power-on feature is available only when using high level inputs. how does the sub come on using low level rca inputs?

Hello no, with the RCA out puts is no power on automatic just in high input

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Rockville RW68CA 400w 6x8 Slim Under-Seat Active Powered Car/Truck Subwoofer Sub Black, RCA

Product ID: 399577574

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Details

Brand
Rockville
Speaker maximum output power
400 Watts
Frequency response
20 Hz
Connectivity technology
RCA
Audio output mode
Stereo

⚡400W Peak Power

❄️Cast Aluminum Cool Enclosure

🎚️Adjustable Bass & Filters

Description

🎵 Feel the bass, not the bulk — power-packed sound that fits under your seat!

COMPACT POWERHOUSE - 400W peak power delivers deep, room-shaking bass without sacrificing space under your seat.
SMART CONNECTIVITY - High-level inputs with auto turn-on and remote bass knob for seamless control on the go.
COOL DURABLE DESIGN - Cast aluminum enclosure ensures your subwoofer stays cool and reliable during every drive.
BUILT TO LAST PROTECT - Thermal, short, and overload protection circuits keep your subwoofer safe and performing at its best.
TAILORED BASS EXPERIENCE - Adjustable low pass filter (50Hz-180Hz) and bass boost (up to 12dB) let you customize your sound.

The Rockville RW68CA is a slim, 6x8-inch powered subwoofer delivering 400W peak power with a cast aluminum enclosure for superior cooling. Designed for compact spaces, it features adjustable bass controls, smart auto turn-on technology, and multiple protection circuits, making it the perfect upgrade for car and truck audio systems seeking deep, customizable bass without sacrificing cabin space.

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