The UK's leading Integrator and Equipment
Installer for the Digital Cinema Industry


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Founded over four decades ago, QSC Audio Products, LLC, is a globally recognized leader in the design and manufacture of professional audio system solutions. Sound Associates have been specifying and installing QSC amplifiers for use in cinemas large and small for many years and now with Q-Sys we continue to deliver high quality cinema sound.

QSC introduced a full range of cinema speakers and Sound Associates is proud to have carried out all of the UK installations of their stage, sub-bass and surround speakers. The range now includes digital signal processing (DSP) and, again, Sound Associates have carried out numerous installations, both here in the UK as well as overseas.

In 2016 QCS acquired Ultra-Stereo Labs, Inc. (USL) allowing them to offer an industry-leading porfolio of sound processing solutions for the motion picture exhibition industry.


SC-424 & SC-424-8 Cinema 4-way Screen Channel Systems THX Approved

Developed specifically for the unique requirements of professional motion picture playback, the SC-424 extends QSC's commitment to the cinema market. As a member of the DCS Digital Cinema Speaker Series, the SC-424 is a four-way, selectable tri or quad-amplified screen channel loudspeaker system comprised of two main units - the MHV-1090 midhigh- very high-frequency system and the LF-4215 low-frequency system.

The MHV-1090 mid-high-very high system features a high output, horn loaded 10"" midrange cone driver and a coaxial neodymium high-frequency/very high-frequency compression driver . The MHV-1090 includes a driver protection network and a passive crossover for tri-amp operation. The protection circuitry prevents low-frequency signals from damaging the high-frequency and very high-frequency driver. A high power 10"" cone driver allows operation as low as 250 Hz and the advanced phase plug coupling permits a crossover point of up to 1800 Hz to the high-frequency horn. This ensures that most of the dialog range is reproduced by a single element, for unmatched intelligibility.

The coaxial neodymium high-frequency/very highfrequency compression driver provides a dramatic improvement in dynamic response, clarity and transparency. The annular high-frequency diaphragm covers the frequency range between 1800 and 7000 Hz with a smooth, linear response. The large diaphragm excursion of +/-0.8 mm results in high output and increased power handling. The very highfrequency driver covers the frequency range from 7000 to 22,000 Hz and eliminates the dome break up of conventional drivers that can cause resonance and harsh, metallic sound.

The LF-4215 dual 15"" (381 mm) low-frequency enclosure is designed specifically to address the extended low-frequency response required for cinema applications. The LF-4215 covers the frequency range from 35 Hz to 250 Hz. Close coupled woofers (CCW), with their tight spacing between woofers, improves coupling and keeps coverage angles wide over a greater frequency range than more widely spaced designs. The LF-4215-8 is the 8 ohm version of the LF-4215.

The SC-424 is designed for ease of installation. The MHV-1090 components come pre-assembled to reduce field assembly time. Three bolts are all that are required to secure the MHV-1090 to the top of the LF-4215 enclosure.


  • Four-way selectable, tri or quad- amplified screen channel system.
  • Unique HF/VHF diaphragm has less mass than traditional diaphragms resulting in exceptional dynamic range, extended high frequency response and lower distortion.
  • LF-4215 is constructed of MDF and is heavily braced.
  • Low-distortion waveguides provide highly articulate dialogue.
  • Shallow depth (20"") facilitates installation.
  • THX Approved.

Download Datasheet

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