Features

Overview: The A600.4 4-channel amplifier is part of Audio Control's Altitude Series amplifiers, offering robust power, exceptional sound quality, and long-lasting durability. The amplifier features an anodized aluminum chassis that provides superior thermal dissipation with a sleek, modern look. The A600.4 is EV compliant (up to 17-volts) and compatible with Start-Stop vehicles.

Class D Circuitry: The Audio Control A600.4 amplifier features Advanced HEXFET® power MOSFETs from International Rectifier that use advanced processing techniques to achieve extremely low on-resistance and fast, reliable switching speeds. A premium toroidal transformer and low ESR capacitors provide optimum efficiency with minimal power loss and signal distortion. Precision metal potentiometers for the audio adjustments allow for precise tuning.

Power: The Audio Control A600.4 can provide the following RMS output power (@ 14.4 V):

• 100W x 4 @ 4-ohms
• 150W x 4 @ 2-ohms
• 300W x 2 @ 4-ohms (bridged)

Controls & Indicators: All of the A600.4 controls are located under a protective panel. The panel can be removed using the provided 2.5mm Allen key. A slot-head screwdriver (not included) is needed to adjust the rotary controls. Amplifier controls include:

• Trigger Mode: A 3-way switch determines the activation method for the amplifier:
  • Remote: Requires a 12 V signal on the Remote In terminal to activate the amp.
  • GTO (Great Turn On) Signal Sense: This method activates the amp when it detects your headunit powering up, and deactivates when the headunit powers off. Channel 1 input must be used for GTO sensing to work.
  • Audio: Activates the amplifier when an audio signal is detected on Channel 1 input, and will deactivate when no signal is present. This setting works well when you have your headunit on, but aren't playing anything, the amp won't be activated.
• Input Level: A 2-way switch sets the amplifier to work with either Low-level signals (500 mV-6 V) or High-level signals (1.5-20 V) using the LC Direct speaker-level input harness.
• Input Mode: A 2-way switch determines which inputs will be feeding the four amp channels; options for 2Ch and 4Ch.
• Filter Mode (x2): A 3-way switch for channels 1/2 and 3/4 determines the filter type; HPF, LPF, Off (full).
• Filter Frequency (x2): Two rotary dials let you set the cutoff frequency of each Linkwitz-Riley Crossover; 50-500 Hz or 50-5000 Hz range (based on Filter Range switch) with a 12 dB/octave slope.
• Filter Range (x2): A 2-way switch for each crossover multiplies the cutoff frequency value; x1 and x10.
• Gain (x2): A rotary gain control for each pair of channels adjusts the overall level of the input signals.
• Max: A Max LED next to the Gain dial will glow briefly during loud bursts of music when the gain has been set for optimum performance. If the Max indicator is frequently lit, the Gain may need to be lowered.
• Power LED: Illuminates White when the amplifier is powered on and working nominally.
• Protect LED: Illuminates Red if the amp detects a shorted speaker wire or an internal problem.

Valet Mode: A set-screw terminal on the amplifier lets you connect an optional rocker switch (sold separately) for activating Valet Mode. When switched on, this mode lowers the maximum volume of the amp to 25%, letting you hand over your vehicle to a parking valet or young driver without having to worry about the volume getting turned up too high and damaging speakers.

Optional ACR-1 Wired Remote Control: The optional 161ACR-1 wired remote control (sold separately) lets you easily adjust the audio level of channels 3/4 separately when bridging to a subwoofer. The ACR-1 can be mounted underneath a dash panel or console and includes a 20' connection cable with RJ-14 connectors.

Connections: The A600.4 features set-screw wiring terminals that use the included 3mm Allen (hex) key for loosening/tightening. Connections include:

• Power & Ground: Power and Ground terminals will accept up to 2-gauge wire (4-gauge recommended; Remote In terminal accepts up to 8-gauge wire (18-gauge is usually sufficient). The A600.4 amplifier does not include any fuses; an 80A fuse (sold separately) should be placed in-line on the power wire, no more than 18" from the battery.
• Low-Level Inputs: Two pairs of RCA jacks (Ch 1/2 & Ch 3/4) are provided for connecting the amp to the source unit via RCA cables. The low-level inputs can accept audio signals from 500 mV to 6 V. The Input Mode switch will need to be set according to how many of the RCA low-level inputs are used (2Ch or 4Ch).
• Low-Level Outputs: A pair of RCA output jacks lets you pass the input signals from Ch 1/2 out to an additional amplifier.
• LC Direct (Speaker-Level Inputs): A 16-pin connector with eight wires provides the speaker-level inputs for connecting to a headunit without low-level (RCA) outputs. The speaker-level inputs can accept signals from 1.5-20 volts.
• Speaker Output: Four pairs of set-screw terminals, accepting wire up to 8-gauge, are provided for the four speaker outputs. Bridging terminals are indicated on the amp.
• RJ-14 Jack: An RJ-14 jack provides the connection for an optional ACR-1 wired remote (sold separately).