Read the Privacy Policy
4-CHANNEL MODE
2-CHANNEL BRIDGED MODE
5.9" W × 5.39" L × 2.1" H
The Sky High Car Audio FXB-800.4 takes everything the FXB Series was created around and packs it into one of the smallest amplifiers in the lineup.
Measuring just 5.9" × 5.39" × 2.1", this ultra-compact Class D full-range 4-channel delivers 225 watts RMS × 4 at 2 ohms and 130 watts RMS × 4 at 4 ohms at 14.4V.
That's up to 900 watts RMS of combined 4-channel output from an amplifier barely over 5 inches long.
Don't let the compact size or reasonable price fool you.
The FXB-800.4 was built to bring serious SHCA quality, power, flexibility, and installation options into the compact amplifier market without making you pay a premium just because the amplifier is small.
This isn't about making a cheaper amplifier smaller.
It's about putting real power where traditional amplifiers simply won't fit.
Sometimes you don't need 2,000 or 3,000 watts.
You need four channels of real power in almost no space.
That's exactly where the FXB-800.4 shines.
Its tiny footprint makes it perfect for motorcycle audio, powersports applications, modern vehicle integration, factory system upgrades, under-seat installations, behind-seat installs, hidden systems, and virtually any build where amplifier space is at a premium.
Motorcycle and powersports builds are an obvious fit. When every inch of installation space matters, getting four channels of serious output from a chassis barely over 5 inches long can completely change how a system is designed.
Modern cars and trucks present many of the same challenges. Factory electronics, limited mounting locations, tighter interiors, and increasingly complex OEM systems leave installers less room to work.
The FXB-800.4 lets you add real aftermarket power without turning amplifier placement into the biggest challenge of the installation.
Maximum usable power. Minimum wasted space.
Small chassis doesn't mean small output.
At 2 ohms, the FXB-800.4 delivers:
225 watts RMS × 4 channels at 14.4V.
At 4 ohms, you still have:
130 watts RMS × 4 channels at 14.4V.
That gives you plenty of power for high-performance coaxials, component sets, midrange drivers, pro-audio speakers, or a combination of speakers in a custom system.
And when four channels aren't what the build calls for:
Bridge it.
The FXB-800.4 is fully bridgeable at 4 ohms, giving you even more ways to use this little amplifier.
In 2-channel bridged mode, the FXB-800.4 produces:
400 watts RMS × 2 at 4 ohms at 14.4V.
It can also deliver:
260 watts RMS × 2 at 8 ohms at 14.4V.
Run all four channels independently. Bridge a pair when you need additional power. Or bridge both channel pairs and turn this tiny 4-channel into a powerful 2-channel amplifier.
Four channels when you need them. Serious bridged power when you don't.
The FXB-800.4 isn't just about fitting into small spaces.
Its ultra-fast switching Class D design provides full-range frequency response from 10Hz to 25kHz, allowing it to reproduce the entire audible range needed for a wide variety of system designs.
A selectable HPF / FULL / LP-BP crossover control gives installers the flexibility to configure the amplifier around the speakers it's powering, while the 2-channel / 4-channel input selection switch can simplify signal routing in different system configurations.
The crossover section uses metal detent potentiometers, providing positive, repeatable adjustment points when dialing in the amplifier.
And with Tiffany-style RCA connections, the FXB-800.4 brings features and hardware normally associated with much more expensive amplifiers into the FXB platform.
One of the most interesting things about the FXB-800.4 is what it doesn't need.
Despite its tiny chassis and impressive output, the FXB-800.4 is designed to operate without an internal cooling fan.
That means no additional fan noise—something that can be particularly valuable in motorcycles, OEM integration, hidden installations, and systems where the amplifier may be mounted closer to the occupants.
With a rated 85% efficiency at full power, the compact Class D platform was designed to make efficient use of the space available.
The amplifier also includes thermal, overload, DC output, short-circuit, and voltage input protection, along with dedicated power, protection, and clipping indicators.
Small doesn't mean stripped down.
