For sale is a used Audiocontrol Four.1, Line Driver/EQ. Its in Perfect working condition. Was mounted in dash before so top plate is scratched but definitely does not take away the performance of it by any means.
The AC Four.1 has the mounting brackets included so you can mount it under the dash, inside the center console, or mount it wherever. The LED light works on the unit also but i think its just pushed into the unit a little bit. The manual is a print off from the website.
Looking to get $175 shipped for the unit OBO, Shipped USPS with insurance. NO TRADES!
Features
Description: The Four.1i is a combination equalizer/line driver. The 1/2 DIN chassis can be mounted in-dash, or under-dash using the included brackets.
4 Band Graphic EQ: The rotary knobs adjust the signal +/-12 dB at 125 Hz, 500 Hz, 2 kHz, and 8 kHz. There's a notch at each knob's center position so it's easy to return to the flat setting.
Para-Bass: Para-Bass is a single band, parametric equalizer for the bass output. Like the four graphic EQ bands, the adjustment range is +/-12 dB; the center frequency is continuously variable from 40 Hz to 80 Hz.
Line Driver: To achieve the best possible signal to noise ratio and dynamic range from your amplifier, the built-in line driver can increase the head unit's output voltage up to 20 dB (9.5 volts RMS/ 13 volts peak).
Aux In: In addition to the main input, there is an auxiliary input (stereo RCA). A switch on the front panel toggles between the two inputs.
Volume: If you choose, you can adjust the system volume using the Four.1i's volume knob. This allows you to leave the source volume at it's maximum un-clipped level, resulting in the best signal to noise ratio and dynamic range output from the source.
Fader: Because there is only one stereo line input and both front and rear line outputs, the front panel fader knob is needed to adjust the relative front and rear volume.
Input Gain: The input gain for the left and right channels is set independently; 0 dB to +20 dB. The +20 dB gain allows you to increase the head unit's line voltage to the top of your amp's input range; up to 9.5 volts RMS/13 volts peak.
Balanced Inputs/Outputs: Using the balanced differential input circuit cancels noise picked up in the transmission line between the Four.1i the the source unit, or between the Four.1i and the amplifiers. Both the main and auxiliary inputs and the outputs can be individually set to balanced or unbalanced, incase your amps don't accept balanced inputs.
Ground Isolation: The power supply ground is switchable, in case of ground loop noise. The factory position is fully isolated (typically the best choice), but can be changed to Ground or 200Ω.
Terminal Block: The power/ground/remote/illumination terminal is removable; the wiring is attached to the block, then the block is plugged into the rear panel of the Four.1i.
Illumination: The outer ring of each knob is lit whenever the illumination terminal is energized. The color is switchable between green and amber.
The AC Four.1 has the mounting brackets included so you can mount it under the dash, inside the center console, or mount it wherever. The LED light works on the unit also but i think its just pushed into the unit a little bit. The manual is a print off from the website.
Looking to get $175 shipped for the unit OBO, Shipped USPS with insurance. NO TRADES!
Features
Description: The Four.1i is a combination equalizer/line driver. The 1/2 DIN chassis can be mounted in-dash, or under-dash using the included brackets.
4 Band Graphic EQ: The rotary knobs adjust the signal +/-12 dB at 125 Hz, 500 Hz, 2 kHz, and 8 kHz. There's a notch at each knob's center position so it's easy to return to the flat setting.
Para-Bass: Para-Bass is a single band, parametric equalizer for the bass output. Like the four graphic EQ bands, the adjustment range is +/-12 dB; the center frequency is continuously variable from 40 Hz to 80 Hz.
Line Driver: To achieve the best possible signal to noise ratio and dynamic range from your amplifier, the built-in line driver can increase the head unit's output voltage up to 20 dB (9.5 volts RMS/ 13 volts peak).
Aux In: In addition to the main input, there is an auxiliary input (stereo RCA). A switch on the front panel toggles between the two inputs.
Volume: If you choose, you can adjust the system volume using the Four.1i's volume knob. This allows you to leave the source volume at it's maximum un-clipped level, resulting in the best signal to noise ratio and dynamic range output from the source.
Fader: Because there is only one stereo line input and both front and rear line outputs, the front panel fader knob is needed to adjust the relative front and rear volume.
Input Gain: The input gain for the left and right channels is set independently; 0 dB to +20 dB. The +20 dB gain allows you to increase the head unit's line voltage to the top of your amp's input range; up to 9.5 volts RMS/13 volts peak.
Balanced Inputs/Outputs: Using the balanced differential input circuit cancels noise picked up in the transmission line between the Four.1i the the source unit, or between the Four.1i and the amplifiers. Both the main and auxiliary inputs and the outputs can be individually set to balanced or unbalanced, incase your amps don't accept balanced inputs.
Ground Isolation: The power supply ground is switchable, in case of ground loop noise. The factory position is fully isolated (typically the best choice), but can be changed to Ground or 200Ω.
Terminal Block: The power/ground/remote/illumination terminal is removable; the wiring is attached to the block, then the block is plugged into the rear panel of the Four.1i.
Illumination: The outer ring of each knob is lit whenever the illumination terminal is energized. The color is switchable between green and amber.
Last edited by a moderator:
