AC1000K4
Four channels. 150 watts RMS each — every one tested simultaneously at rated load, not a combined figure built from a single channel measured in isolation. Bridge any two and you're at 450 watts RMS. But power without accuracy is just loudness. The AC1000K4 delivers both: the output to drive a complete system without compromise, and a signal path clean enough that vocals sit forward and natural, detail doesn't get buried, and nothing stands between the recording and your ears.
Full Range.
Full Truth.
Nothing Missing.
Full-range amplification isn't just a topology — it's a commitment to reproducing every frequency your music was recorded with. Vocals land where the artist placed them. Midrange detail doesn't disappear under load. Highs stay extended and clean from the first note to the last. That requires power that doesn't compress when it counts, and a noise floor that doesn't mask the quiet moments between the loud ones.
The AC1000K4 delivers 150W RMS per channel at 4 ohms — all four simultaneously, independently verified under real-world conditions. Not a peak figure. Not a single channel driven while three sit idle. A genuine, repeatable number across the entire bandwidth, printed on the box without an asterisk.
"Accuracy isn't a feature — it's the standard every channel is held to before this amplifier ships."
— The Aunex Build StandardEverything You Need.
Nothing You Don't.
4-Channel Amplifier
241 × 52 × 145 mm
Built for the
Real World.
Reproducing vocals with accuracy means eliminating every variable that introduces color, noise, or compression before the signal reaches your drivers. The AC1000K4 is engineered from the input stage to the output terminals with that standard in mind — a clean, wide-open signal path with enough headroom that the amp is never the limiting factor between the recording and your ears.
Four Full-Range Channels — Built for the Whole Stage
Drive your tweeters and mid-bass drivers at 150W RMS per channel — enough headroom that the amplifier never clips before your speakers do. Run all four channels across a full front and rear stage, or bridge a pair to anchor a subwoofer while the remaining two handle the full-range work up front. Every channel is independently tested at rated load simultaneously — the same verified standard in every configuration, every time.
4-Layer PCB · SMD Technology
Unlike the 2-layer boards standard at this price point, the AC1000K4's custom 4-layer PCB incorporates dedicated internal power and ground planes. Those buried copper layers act as a Faraday shield — eliminating alternator whine and EMI at the source, not masking it downstream. The added copper mass also increases structural rigidity and thermal dissipation, so the board runs cooler under sustained load and survives the road vibration that eventually fractures solder joints in lesser builds.
Variable Crossovers Tuned for Vocal Precision · 12dB/Octave
Vocals live in the midrange — roughly 300Hz to 3kHz — and how cleanly you hand off frequencies above and below that range determines whether a voice sounds present and natural or buried and compressed. The AC1000K4's high-pass crossover sweeps 400Hz to 4kHz, letting you dial in exactly where each driver takes over. The 12dB/octave slope provides a controlled, musical rolloff that lets full-range drivers transition naturally without abrupt cutoff — ideal for coaxial and component setups alike.
Self-Recovering 4-Way Protection Circuitry
Thermal shutdown, short circuit protection, under-voltage and over-voltage protection work across all four channels independently. The AC1000K4's short circuit protection is self-recovering — the amplifier detects the fault, shuts down the affected channel, and resumes operation automatically once the condition clears. No manual reset required, no trip to the trunk.
Real-Time LED Visual Clipping Indicator
Visual feedback at a glance. The integrated LED clipping indicator gives you instant confirmation that you're maximizing output without distorting your drivers — a feature typically reserved for amplifiers at twice the price point. Set your gain correctly once and know it stays there.
Zero-Point Balanced Inputs (CMRR)
Fully balanced architecture with high CMRR technology actively neutralizes electrical noise at the entry point. High-level inputs accommodate OEM source units directly. DC auto turn-on means the amp powers on reliably with the vehicle regardless of whether a remote turn-on wire is available — a clean drop-in for factory systems without an aftermarket head unit.
Solid Nickel-Plated Terminals
Copper corrodes. Untreated steel corrodes faster. Nickel doesn't. Our industrial-grade block terminals are solid nickel-plated to maintain a low-resistance connection years after install — not just on day one. Every milliohm of contact resistance you eliminate at the terminal is headroom that reaches your drivers instead of turning into heat at the connector.
Soft On/Off Delay
An intelligent soft-start circuit sequences internal power ramping at turn-on and turn-off, eliminating the thump or pop that travels through your speakers every time you start or stop the vehicle. Repeated voltage transients stress tweeters and mid-range drivers over time — the AC1000K4 handles the sequencing internally so your drivers don't absorb the hit.
Every Standard.
Every Unit.
These aren't options, upgrades, or premium-tier exclusives. Every feature listed below ships on every AC1000K4 — verified before it leaves the facility.
The Industry Sells
Numbers. We Sell
Results.
Full-range amplification only works when every part of the signal chain is honest. Inflated power figures introduce clipping before the driver reaches its limit. A dirty noise floor buries the quiet detail that makes a vocal sound real. Frequency overlap from lazy crossover design smears the image. The AC1000K4 was built to eliminate all three — 150W RMS per channel independently verified, a noise floor that stays out of the way, and crossover control precise enough that every driver handles only what it was designed for. This is what a voice sounds like when nothing is in the way.