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AudioControl THREE.1

In-dash equalizer with 2-way crossover

Item # 161THREEP1

AudioControl's THREE.1 equalizer reinvents the old-school in-dash EQ.

AudioControl's THREE.1 equalizer reinvents the old-school in-dash EQ.

Discontinued item

Item # 161THREEP1

About the AudioControl THREE.1

AudioControl's THREE.1 equalizer reinvents the old-school in-dash EQ. This versatile jack-of-all-trades features 3-band equalization, a parametric bass equalizer, a 2-way crossover, and a built-in line driver that'll send a hot, clean signal to your amps.

AudioControl's THREE.1 equalizer reinvents the old-school in-dash EQ. This versatile jack-of-all-trades features 3-band equalization, a parametric bass equalizer, a 2-way crossover, and a built-in line driver that'll send a hot, clean signal to your amps.

Mount the 1" tall THREE.1 equalizer in your vehicle's dash opening along with your receiver, or under the dash if space is an issue. For connections, you'll find a set of preamp inputs, along with front, rear, and subwoofer outputs, plus speaker-level inputs that'll hook up to almost any factory radio. You can adjust response at 125, 1250, and 12,500 Hz, then use the parametric EQ to find the bass "sweet spot" between 40 and 80 Hz.

AudioControl makes setup easy. Bring up your input knob until the "Overload" LED starts to flicker, then adjust your output level to get the most out of your amplifiers. The 2-way crossover is set at 90 Hz, but you can change the crossover point with an optional AudioControl module or by modifying the existing module.

The ground isolation selector allows you to minimize noise in your system. You can choose between green or amber illumination.


Product highlights:

  • in-dash equalizer with 2-way crossover and line driver
  • steel chassis with gold-plated RCA jacks
  • 3-band EQ (125, 1250, and 12500 Hz) with parametric equalization for bass (adjustable from 40 to 80 Hz, +/-12 dB)
  • balanced inputs eliminate noise
  • 2-way Linkwitz-Riley crossover (90 Hz at 24 dB per octave)
  • line driver increases output up to 9.5 volts RMS
  • inputs: stereo RCA, speaker-level
  • outputs: front, rear, subwoofer
  • green or amber illumination
  • frequency response: 10 to 100,000 Hz
  • signal-to-noise ratio: 110 dB
  • maximum output level: 9.5 volts
  • fuse rating: 1 amp
  • size: 6-13/16"W x 1-1/16"H x 6-11/16"D
  • weight: 2 pounds
  • warranty: 5 years
  • Our 60-day money-back guarantee
  • MFR # THREE.1

What's in the box:

  • Pre-amp line driver/EQ/crossover
  • 2 Mounting brackets
  • 4 Mounting screws
  • Owner's manual
  • QC checklist
  • Product registration card

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Crutchfield response

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More details on the AudioControl THREE.1

Russ B.

Product Research


Description: The Three.1 is a combination equalizer/crossover/line driver. The 1/2 DIN chassis can be mounted in-dash, or under-dash using the included brackets.

3 Band Graphic EQ: The rotary knobs adjust the signal +/-12 dB at 125 Hz, 1.25 kHz, and 10 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.

Crossover: The Three.1 has built-in high-pass and low-pass crossovers. The high-pass is applied to the front and rear line outputs. The low-pass is applied to the subwoofer output. The crossover slope is 24 dB/octave and the crossover point is 90 Hz. The crossover point is governed by a replaceable chip; replacement chips range from 30 Hz to 3,500 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).

Volume: If you choose, you can adjust the system volume using the Three.1'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.

Subwoofer Level Control: The relative subwoofer volume is adjusted using the rotary Sub Level control on the front panel.

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 Input: Using the balanced differential input circuit cancels noise picked up in the transmission line between the Three.1 the the source unit.

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 Blocks: The power/ground/remote/illumination terminal and the speaker level input terminal are removable; the wiring is attached to the block, then the block is plugged into the rear panel of the Three.1.

Illumination: The outer ring of each knob is lit whenever the illumination terminal is energized. The color is switchable between green and amber.

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