Product Description
FXB-800.4
POWER @ 14.4V
4-CHANNEL MODE
- 225W RMS × 4 @ 2 Ohms
- 130W RMS × 4 @ 4 Ohms
- 2-Ohm Minimum Impedance per Channel
2-CHANNEL BRIDGED MODE
- 400W RMS × 2 @ 4 Ohms
- 260W RMS × 2 @ 8 Ohms
- 4-Ohm Minimum Bridged Impedance
HIGHLIGHTS
- Compact Class D full-range 4-channel amplifier
- 225W RMS × 4 @ 2 ohms
- 130W RMS × 4 @ 4 ohms
- Fully bridgeable at 4 ohms
- 400W RMS × 2 bridged @ 4 ohms
- Only 5.39 inches long
- Perfect for motorcycle and powersports audio
- Excellent for modern vehicle and OEM system integration
- Ultra-fast switching design
- 10V–16V operating range
- 10Hz–25kHz full-range frequency response
- HPF / FULL / LP-BP crossover selection
- 2-channel / 4-channel input selection
- Metal detent crossover potentiometers
- Tiffany-style RCA connections
- Reversible SHCA emblem
- LED power indicator
- Clipping indicator
- Protection indicator
- Fanless design
- 85% efficiency at full power
- 95 dB signal-to-noise ratio
- 180 damping factor
- <0.1% THD
- Thermal protection
- Overload protection
- DC output protection
- Short-circuit output protection
- Voltage input protection
- 4-gauge power terminals
- 10-gauge speaker output terminals
- 90A fuse rating
- SHCA modular mounting ecosystem compatibility
- SHCA Universal Amp Key mounting options
- Passive cooling and color options
- 1-Year Manufacturer Defect Warranty
DIMENSIONS
5.9" W × 5.39" L × 2.1" H
FOUR CHANNELS. 800+ WATTS. ALMOST NO SPACE.
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.
BUILT FOR THE PLACES BIG AMPS CAN'T GO.
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.
225 WATTS. FOUR CHANNELS.
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.
FULLY BRIDGEABLE AT 4 OHMS.
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.
ULTRA-FAST SWITCHING. FULL-RANGE PERFORMANCE.
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.
NO FAN REQUIRED.
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.
MADE TO INTEGRATE.
The FXB-800.4 operates from 10V to 16V, giving it the voltage range needed for a wide variety of automotive and powersports electrical systems.
A 4-gauge power input provides the current capability needed for the amplifier, while 10-gauge speaker outputs give installers room for substantial speaker wiring despite the amplifier's incredibly small size.
The reversible emblem also allows the amplifier's appearance to be corrected for different mounting orientations—another small detail that matters when the amplifier is incorporated into a finished custom installation.
PART OF THE SHCA MODULAR AMP ECOSYSTEM.
The compact chassis is only part of what makes the FXB Series different.
The FXB Series brings the modular, customizable amplifier concept made popular by our SHCA Series amplifiersinto our compact amplifier lineup.
Using the SHCA Universal Amp Key system, FXB amplifiers can take advantage of SHCA mounting and customization options, opening up entirely new possibilities for tight installations and custom amplifier displays.
Mount it flat. Mount it at an angle. Combine multiple amplifiers into a larger installation. Add passive cooling. Change the look with different passive cooling color options.
For motorcycle audio and modern vehicle integration especially, that mounting flexibility can be just as important as the amplifier's small dimensions.
Instead of forcing the installation to fit the amplifier:
FXB gives you more ways to make the amplifier fit the installation.
IMPORTANT IMPEDANCE NOTICE
The FXB-800.4 has a minimum impedance of 2 ohms per channel in stereo mode and 4 ohms when bridged.
Operating the amplifier below these minimum impedances can cause amplifier damage and is not covered under the 1-Year Manufacturer Defect Warranty.
DON'T LET THE SIZE FOOL YOU.
The FXB-800.4 represents exactly what the FXB Series was created to accomplish:
High-quality construction. Real power. An incredibly compact footprint. SHCA customization. And a price that makes serious amplification accessible to more builds.
Motorcycle. Powersports. Modern vehicle integration. Factory upgrade. Full custom build.
If you've got room for roughly 6 inches × 5.5 inches, you've got room for some serious 4-channel power.
Small enough to hide. Powerful enough that you won't want to.
Sky High Car Audio FXB Series
BIG POWER. SMALL FOOTPRINT. BUILT THE SHCA WAY.
POWER HOW YOU WANT IT.
