The KMTC65 we reviewed separately solves the round-tubing mounting problem at 65W RMS. The Kicker KMTC8 solves the same mounting problem at 150W RMS (300W peak), using an 8-inch driver in the identical clamp-and-rotate housing, at $799.99 (down from $899.99).
Same clamp mechanism, same toolless rotation, more than double the power. As an authorized Kicker dealer, here's what that extra headroom actually changes for a round-tube tower install, and when the smaller KMTC65 is still the smarter buy.
Key Takeaways
- Same clamp mount as the KMTC65: fits 1.5-3.25" tubing, toolless locking cam/toggle, near-full rotation after mounting.
- 150W RMS / 300W peak at 4-ohm — more than double the KMTC65's 65W RMS rating, in the same mounting format.
- Frequency response extends to 30Hz on the low end, versus 35Hz on the KMTC65, thanks to the larger 8-inch woofer.
- At $799.99, it's $100 more than the 46KMFC8 flat-mount equivalent for the clamp mounting mechanism instead of flat-surface bolts.
- Heavier than the KMTC65 (23.6 lbs boxed vs. 18.9 lbs) — confirm your tube and clamp point can support the added weight.
What Changes Going From 6.5" to 8"
The clamp mechanism, rotation system, and LED setup are unchanged from the KMTC65. What changes is the driver: an 8-inch woofer with a 1-inch PEI tweeter instead of the smaller unit, doubling recommended power and extending bass response down to 30Hz. If you're mounting to round tubing and found the KMTC65 underpowered for your boat's speed and noise level, this is the direct upgrade path without switching mounting mechanisms.
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Feature Walkthrough
Power and Frequency Response
150W RMS, 300W peak, at 4-ohm, 30Hz-21kHz frequency response.
Clamp and Weight
Same 1.5-3.25" tube range as the KMTC65, but a heavier boxed weight (23.6 lbs vs. 18.9 lbs) reflecting the larger driver and enclosure. Confirm your tower or rail's load rating can handle the added weight at your specific mounting point.
Amplifier Pairing
At 150W RMS, the KMA600.4 (150W RMS/channel at 4-ohm) is a close match on paper, the same pairing logic that applies to the flat-mount 46KMFC8. This is our own power-matching read, not an official Kicker-stated pairing.
Who It's For
Choose the KMTC8 over the KMTC65 for the same reason you'd choose the 46KMFC8 over the 46KMFC65: faster boats where wind and engine noise demand more headroom. Choose it over the flat-mount 46KMFC8 specifically when your mounting point is round tubing with no flat surface.
Honest Cons
$100 more than the flat-mount 46KMFC8 for the clamp mechanism — only worth it if you actually need to mount to round tubing.
Heavier than the KMTC65. Verify your tube's load capacity at the clamp point before committing to the larger driver.
Overkill for calm, low-speed boats, same as the flat-mount 46KMFC8 — the KMTC65 covers that use case for less.
Frequently Asked Questions
Does the KMTC8 use the same clamp as the KMTC65?
Yes — identical clamp mechanism and tube range (1.5-3.25"), just paired with a larger, higher-output driver.
Is this heavier than the KMTC65?
Yes, at 23.6 lbs boxed versus 18.9 lbs — confirm your tower or rail can support the added weight at the mounting point.
Should I get the KMTC8 or the flat-mount 46KMFC8?
If you have a flat mounting surface available, the 46KMFC8 delivers the same power for $100 less. Choose the KMTC8 only if your mounting point is round tubing.
What amp should I run with this speaker?
The KMA600.4 (150W RMS/channel) is the closest match among the amps we've reviewed.
Bottom Line
The KMTC8 is the higher-output version of the same clamp-mount solution the KMTC65 established. Get it specifically for round-tube mounting points that need real power; if a flat surface is available, the 46KMFC8 does the same job for less.