Studio Drive Units
ATC studio drive units are built for people who want nothing less than the finest quality and the highest performance. Their role is to complement other very high performance high quality equipment to produce literally the best audio performance money can buy. And because they use state of the art design, and are subject to very tough quality control, ATC studio drivers have a reputation for reliability that’s second to none. ATC’s SM75-150 soft dome mid-range driver has established new performance limits for such units. Although it is only a 3inch unit, it combines high sensitivity with extremely low distortion and has a usable frequency response for 300Hz to 4000 Hz. Its key components are its soft diaphragm, impregnated with a viscous damping medium (which gives a smooth response with very low audible colouration) and the drive motor consists of a short coil operating in a long magnetic gap (which cuts audible distortion dramatically). Neither of these features is exactly cheap to engineer or build, but together they give the ATC mid-range an unrivalled combination of efficiency, compactness and power handling capability. ATC’s low frequency drive units come as a four unit range-9inch, 12inch, 15inch (3inch voice coil) and 15inch (4inch voice coil). Each unit has a short coil operating in a long magnetic field which has the advantage that during normal operation the coil always remains within the linear magnetic field. The 9inch and 15inch units are also offered with a long coil and short magnetic field.
The bass drivers incorporate the latest design principles and are all well known for their very low distortion levels, a quality which complements the outstanding performance of the ATC mid-range dome. Each bass driver has its voice coil formed of edgewise-wound copper ribbon wire, wound on an aluminium or kapton former. New adhesive technology is used, along with small coil-gap clearances to give very high power handling ability, with first class durability. The suspension of each ATC bass driver has been developed so that large excursions yield only very low distortion, and each unit has a diecast chassis and a bolted ceramic magnet structure, with a symmetrical magnetic field, to reduce distortion even further. All of the magnet’s metal parts are finished in black to assist heat dissipation from the voice coil, an aid to durability. ATC naturally offers its customers a full technical service, and all products are fully guaranteed. If you require further information, please contact ATC.
Note: Only 9″, 12″ & 15″ short (SC) and long coil (LC) driver variants are available. Super Linear (SL) driver variants are not available for individual sale.
ATC SPECIFICATION – GENERAL NOTES.
Measured and calculated parameters in the attached specifications have been made in accordance with the recommendations of the Standards Association of Australia and IEEE Standards of the U.S.A.
Australian Standard Specification No.1127 “Sound System Loudspeakers” Part 5. 2. USA – IEFE Specification Standard No.219-1975
(A) NOMINAL POWER RATING =E2/Z Watts
Test Signal: Frequency weighted white noise.
Test Amplifier: The test amplifier used has a nominal power output capability of at least four times the nominal rated power of the loudspeaker.
Test Voltage: E is a true RMS voltage.
(B) MAXIMUM INPUT POWER = E2/Z Watts
Test Signal Sine wave.
Test Frequency: The Frequency at which minimum impedance occurs above resonance.
Test Voltage: E is the true RMS voltage which may be applied to the loudspeaker continuously without thermal overload of the voice coil.
(C) MAXIMUM PROGRAM POWER
The power amplifier rating defined by nominal power rating test specified in (A).
2. Other standard impedance values are available to special order.
APPLICATION NOTES Each of the loudspeakers specified has a specific range of applications. It is important that the following recommendations be considered when choosing an ATC loudspeaker.
- STD Speech and vocal amplification, Lower midrange in large PA, Electric guitar and Electric Piano.
- STD-LS Wedge monitors, Cabaret systems, Bass guitar, General purpose PA Bass in 2 way PA.
- BASS Bass guitar, Bass in 2 way PA Wedge monitors
- BASS-LC and BASS-LCR Bass guitar, Horn load bass in large PA Bass in side-fill monitors