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The Q412D Monitoring System from Quested includes a four-way active speaker plus QSB118 Sub Cabinet

Designed to be soffit-mounted main monitors for large control rooms. The system comprises four 12" low frequency drivers, one 3" mid frequency driver, and one 1.5" high frequency driver that combine to provide effortless and articulate performance with sound pressure levels of 130 dB.

The Q412 was Quested's first studio monitor to utilize four 12" bass drivers in place of the standard two 15" configuration, offering faster bass transients, less distortion, and an extended low frequency response. The monitor is supplied with a separate electronics package containing two AP1550-2 amplifier, two AP950-2 amplifiers, and the SM748 electronic crossover/loudspeaker management system. The Q412 ships with five IEC power cables.The Quested QSB118 offers extended low frequency performance. Ideal in applications where extended or high levels of LF performance are required such as music mixes, film recording and effects channels.The cabinet is constructed from 22 mm MDF with a 40 mm front baffle and cross braced for additional rigidity. The bass driver is a 457 mm (18”) unit with a 100 mm (4”), four-layer voice coil, triple rear suspension which allows an exceptionally large peak to peak movement of 50 mm.The driver has an external radial chassis and vented magnet which results in far more efficient cooling of the voice coil. The benefits of this are less power compression, increased output and improved reliability.The Q412FS Systems design is based on one of our most popular and iconic soffit mounted systems. The system has been adapted to allow for the 4212 element to sit on top of the QSB118 sub-bass and be at a perfect height for most work stations with the acoustic center at approximately 1.4m. The 4212 element is a three-way monitor utilizing dual twelve-inch radial chassis drivers.



  • Main Monitor Applications
  • 130 dB Output
  • 4 x 12" Low Frequency Drivers
  • 3" Mid Frequency Driver
  • 1.5" High Frequency Driver
  • 1 x 18" Sub Cabinet
  • 8 Space Rackmountable Amplifiers
  • Dedicated Speaker Processor
  • In the Box

  • 1 x Quested Q412D 4-Way Monitoring
  • 2 x Quested  SP1500-2  Channel Power Amplifier
  • 2 x Quested  SP950-2  Channel Power Amplifier
  • 1 x Quested SM748 - Digital Crossover
  • Limited 1-Year Warranty

Quested Q412D Freestanding Active 4Way Main+Sub Monitor Crossover+Amp System


Specs Mod.Q412d


Bass: 4 x 12" / 30.5 cm
Mid: 3" / 7.5 cm
High: 1.5" / 3.7 cm

Maximum SPL

130 dB at 1 m

Frequency Response

20 Hz to 20 kHz ±2 dB

Input Connections

Gold Plated Binding Post: 3 x twin pair
Accepts 0.2" / 0.4 cm banana plugs or bare wires

Amplifier (Power)

Bass: 1850 W (RMS) into 2 ohms
Mid: 450 W (RMS) into 8 ohms
High 450: 450 W (RMS) into 8 ohms

Crossover Point

Low: 450 HZ Linkwitz-Riley 24 dB/oct
High: 4.5 kHz Linkwitz-Riley 24 dB/oct


37.0 x 34.6 x 26.4" / 94.0 x 88.0 x 67.0 cm


286.6 lb / 130.0 kg

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