QM24 - modular line-source LMF array extension

  • Modular scalable low-mid array system , for each size venue / application
  • Forms high-output line-source arrays in combination with QR24
  • All Neodymium drivers for excellent performance-to-weight ratio
  • Passive filtering for easy operation and economical powering
  • SIS pre-wired for very high damping and further reduced distortion
  • Shallow form factor and ACO™ color option for unobtrusive, “stealth” installation

Product description

The QM24 is a modular, limited bandwidth column loudspeaker to be used as low-mid array, for both permanent and (limited) portable installations. It is designed as low-mid frequency extension of the QR24 pro-ribbon line-source column array.

The QM24 “array-fill” module is applied in a multiple-QR array, where the direct HF reproduction/projection of a QR24 is not required, but where a (taller) uninterrupted LMF line-source array is desirable for extended frequency control and increased LMF throw.

The QM24 contains 4x 6.5” long-excursion woofers in a specific acoustical loading / reflex-venting configuration for high mid-bass frequency output. The tightly-spaced transducer arrangement operates well within line-array parameters, offering high projection accuracy with maximum side-lobe suppression.

This controlled (cylindrical) projection can be extended down to the lower frequencies by enlarging the array length through adding extra QR/QM modules.
The passive filtering allows multiple modules to be combined on one amplifier channel.

In combination with the QR24, very high output arrays can be formed for high-end sound reinforcement in acoustically challenging environments, where precise projection is required without compromising on sound quality, SPL and throw.

For full system performance, the QM24 is driven and controlled by the ALC amplified loudspeaker controller; Driven by the ALC, the QM24 delivers maximum sound quality and output power with long-term operation reliability. The integrated factory presets in the drive processor of the ALC offer gain, phase and filtering matching, as well as array-length correction in combination with the QR24 system.

The Signal Integrity Sensing™ pre-wiring ensures complete cable/connector compensation between the QM24 and ALC, significantly increasing response accuracy of mid and bass frequencies. This offers a 1:1, undistorted natural sound reproduction, regardless of cable length and amplifier impedance load (up to 3 units QM24 per ALC channel).

Dimensional drawing

Technical specifications

 Frequency response    
+/- 3 dB   74 Hz - 1 kHz
+/- 10 dB   53 Hz -
Sensitivity (nominal)   101 dB (200 - 1 kHz)
Nominal impedance   8 ohms
Recommended drive   Sentinel3 min.
Nominal SPL peak   127 dB (Sentinel3 200 - 1 kHz)
132 dB (Sentinel10 200 - 1 kHz)
Dispersion H x V   80° x array length depending

Physical specifications

System 1-way, limited bandwidth
Filtering passive
Drivers LF 4x AND65/8 Neodymium 6.5”, vented
Connectors 2x Speakon NL4 input / link
Physical dimensions    mm             inches
Height 660             26
Width 250             9,8
Depth 337             13,3
Weight     (approx.) 17.5 kg       38.6 lb
Warranty 6 years limited

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