The ATC SM75-150 is a chunky beast of 7 kg due to a massive motor structure. As can be seen, double suspensions secure stable positioning of voice coil in magnet gap. Jeff Bagby a well known loudspeaker designer, he reviewed the ATC SM75-150S Midrange driver as part of a monitor speaker build project. You will find a few sites with reference to his work, below is an interview with him covering some of his award winning design principles.
ATC STUDIO RANGE
(this info was taken from ATC page without their approval or even their knowledge. Some comments and alterations from me.)
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 theart design, and are subject to very tough quality control, ATC studio drivershave a reputation for reliability that's second to none. ATC's SM75-150 softdome mid-range driver has established new performance limits for such units.Although it is only a 3 inch unit, it combines high sensitivity with extremelylow distortion and has a usable frequency response from 300Hz to 4000Hz.Its key components are its soft diaphragm, impregnated with a viscous dampingmedium (which gives a smooth response with very low audible colouration)and the drive motor consists of a short coil operating in a long magneticgap (which cuts audible distortion dramatically). Neither of these featuresis exactly cheap to engineer or build, but together they give the ATC mid-rangean unrivalled combination of efficiency, compactness and power handling capability.
ATC's low frequency drive units come as a four unit range - 9 inch, 12inch, 15 inch (3 inch voice coil) and 15 inch (4 inch voice coil). Each unithas a short coil operating in a long magnetic field which has the advantagethat during normal operation the coil always remains within the linear magneticfield. The 9 inch and 15 inch units are also offered with a long coil andshort magnetic field.
The mid dome has a magnet of 181 mm diameter that weights over 8 kg !!! The bass drivers incorporate the latest design principles and are well knownfor their very low distortion levels, a quality which complements the outstandingperformance of the ATC mid-range dome. Each bass driver has its voice coilformed of edgewise-wound copper ribbon wire, wound on an aluminium or kaptonformer. New adhesive technology is used, along with small coil-gap clearancesto give very high power handling ability, with first class durability. Thesuspension of each ATC bass driver has been developed so that large excursionsyield only very low distortion, and each unit has a diecast chassis and abolted ceramic magnet structure, with a symmetrical magnetic field, to reducedistortion even further. All of the magnet's metal parts are finished inblack to assist heat dissipation from the voice coil, an aid to durability. B100-375SC, has a magnet of 220 mm diameter that weights over 18-kg (40lb) - over 50% larger than the biggest Focal's Audiom! The coil is 100 mm diameter. Membrane is from impregnated cellulose. ![]() ![]()
BASS UNIT IN PROJECT 6
25th April 2017
Here for the gear
Canon Printer Drivers For MacRibbon Midrange Driver
Can anyone comment on Accuton drivers, particularly their midrange? Their C173-6-090 6.5' midrange goes for $827 each on Madisound. They seem to be used in high end audio in the consumer market but I've never seen them used in studio monitors. I've read that the midrange is very accurate, detailed and lacks coloration. A few people have compared them to the ATC midrange. I was wondering if they are that good, why they are not used in studio gear. Perhaps its audiophile hype? Has anyone had a chance to A/B them with the ATC mid? Any info is greatly appreciated as it is hard to find. Thanks.
Dome Midrange Driver
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