AC600K4
Four channels. 100 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 350 watts RMS. Compact chassis, honest numbers, no asterisks. The AC600K4 is the entry point to the AC Series standard — the same verified power promise that runs all the way to the top of the line.
Four Channels.
One Standard.
No Compromises.
Most 4-channel amplifiers at this price point overstate their output, spread peak-rated watts across four channels, and leave your drivers working harder than they should. The AC600K4 does not.
Every channel delivers 100 watts RMS at 4 ohms — independently tested, not claimed. Run all four for a complete front and rear stage, or bridge to two channels for 350 watts RMS each. One amplifier, one honest number, no fine print.
"What's on the box is what comes out of the terminals — no inflated peak numbers, ever."
— The Aunex Power PromiseEverything You Need.
Nothing You Don't.
4-Channel Amplifier
211 × 52 × 145 mm
Built for the
Real World.
The AC600K4 puts verified four-channel power into a compact chassis without the compromises that define the category. Four independent channels on a 4-layer board, all independently tested, all individually protected. Every feature below earns its place.
Four Verified Channels — Any Configuration
Run all four channels across a complete front and rear stage at 100W RMS each. Bridge any two channels for 350W RMS — the same verified standard applies in every configuration. One amplifier, multiple install options, no power compromises.
4-Layer PCB · SMD Technology
Unlike the 2-layer boards standard at this price point, the AC600K4'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.
Wide-Range Variable HPF and LPF · 12dB/Octave
High-pass filtering from 400Hz–4kHz and low-pass filtering from 40Hz–400Hz give you surgical control over what each channel receives — protect tweeters, eliminate overlap, and tune the system precisely without an outboard processor. The 12dB/octave slope provides a controlled, musical rolloff 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. 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.
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 AC600K4 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 AC600K4 — verified before it leaves the facility.
The Industry Sells
Numbers.
We Sell
Results.
Four channels. One verified standard. The AC600K4 delivers 100 watts RMS to every channel — independently tested under real-world conditions, printed on the box without qualification. No combined peak totals. No inflated figures. No fine print. The same 4-layer PCB, the same protection circuitry, the same CMRR input architecture found across the AC Series. This is the standard — not the compromise.