Features • Compact High Power 4-Channel Amplifier • High Current Design • 4x50 Watts @ 4 Ohms, 4x75 Watts @ 2 Ohms • 2x150 Watts @ 4 Ohms, Bridged Mono • 12 dB/Octave Linkwitz-Riley Alignment Crossover • GTO™ Signal Sense (Great Turn On) • 4 Line-Level RCA Inputs • 4 Active Speaker-Level Inputs for OEM integration • Filled with home-grown audio goodness COMPACT HIGH POWER 4-CHANNEL AMPLIFIER Quick Start Guide
Important Safety Instructions 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with a dry cloth. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions. Do not install near any heat sources such as mufflers, silencers, exhaust pipes, or other apparatus (including amplifiers) that produce heat.
Connection Panel Features 1 2 3 4 5 1. Fuse 30A – Replace the fuse only with the exact same style and Ampere rating. Disconnect 12V power before changing or inspecting the fuse. 2. Power Input Terminal +12V – This screw terminal connects to the +12V battery binding post of the vehicle. Use quality insulated wiring of the recommended wire gauge, such as wire gauge 8 or thicker. Thinner wire may cause an overheating hazard due to the large currents involved. 3.
Stereo x 2 Operation 2 Ohms Minimum per channel 6. RCA Analog Line-Level Inputs – The line-level outputs from the head unit or factory installed radios can connect here, so the ACM-4.300 will receive the line-level audio signals. Do not use the speaker-level inputs if you are using the RCA line-level inputs. + 7. Speaker-Level Output Terminals – These screw terminals connect with speaker wire to your loudspeakers.
Control Panel Features 8 9 10 11 12 13 11 12 13 8. Power LED – If you have connected your battery power, vehicle ground, and turn-on lead (or GTO™ signal sensing) correctly, then this light should turn on to indicate the power is ON. GTO™ circuit by moving the switch to the OFF position and use a switched 12-volt signal connected to the Remote In terminal instead. 9. Protection LED – The ACM-4.
12. Gain Controls – These controls allows you to adjust the overall volume output level, with counterclockwise decreasing the volume, and clockwise increasing. One control is for channels 1 and 2, and the other for 3 and 4. The setting procedure is given on the next page, and involves nerves of steel, a steady hand, grit, determination, and the thought that you are making the world a better place. 13. Gain Maximized LEDs – These LEDs indicates when the ACM4.
Quick Start Here are a few general steps to get your ACM-4.300 amplifier up and running: 7. Connect the +12V input terminal of the unit to the +12V terminal of the vehicle battery, using 8 to 4 AWG. 1. Undo the +12V and Ground connections to the car battery before making any connections to the amplifier. 8. Connect the Ground terminal of the unit to the chassis of the vehicle, using the same wire gauge as the +12V power wire. 2.
Power Connections Head Unit Remote Amplifier +12V Trigger In this example, the head unit has a +12V trigger output that is connected to the ACM-4.300 remote input terminal. When the head unit is turned on, it will turn on the ACM-4.300 amplifier. Alternatively, the GTO™ signal sense feature can be used to gently turn on the ACM-4.300 amplifier when an audio input signal is detected. (The connection to the ACM-4.300 remote input terminal is not required when using the GTO™ signal sense.
System #1: Using Speaker-Level Inputs ACM-4.300 + + Speaker-level output 80 Hz and above + + + ACM-1.
System #2: Using Line-Level Inputs ACM-4.300 + Front Speakers + + Line-level outputs Rear Speakers + ACM-1.
Cover Plate Removal The cover plate must be removed to gain access to the controls, and then put back on again to protect the controls from dust bunnies. Removal Procedure 1. Locate the top four screws that hold the cover plate in place. 2. Use a philips screwdriver to remove the four screws. 3. 9.410” 8.910” 8.300” Keep the cover plate and screws in a safe and handy place, until you have finished adjusting the controls to your immense satisfaction. 2.38” 2.97” 1.
Specifications All specifications are measured at 14.4 VDC (standard automotive voltage). As technology advances, AudioControl reserves the right to continuously change our specifications, like our Pacific Northwest weather, although we are working on changing that as well. The ACM-4.300 Amplifier Power Output (RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4x50 Watts @ 4 Ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4x75 Watts @ 2 Ohms .
