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 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 3 inch unit, it combines high sensitivity with extremely low distortion and has a usable frequency response from 300Hz to 4000Hz. 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 - 9 inch, 12 inch, 15 inch (3 inch voice coil) and 15 inch (4 inch 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 9 inch and 15 inch units are also offered with a long coil and short 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 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.
B100-375SC, has a magnet of 220 mm diameter  that weights over 18-kg (40 lb) - over  50% larger than the biggest Focal's Audiom!
The coil is 100 mm diameter. Membrane is from impregnated cellulose.
 
 
 

Technical Specification For SM75-150
SPECIFICATION

Sensitivity 

Nominal Power Rating 

Maximum Input Power 

Maximum Programme Power 

Usable Frequency Range 

Recommended Crossover
Frequencies in System 

Nominal Free Air Resonance fs 

Mechanical Damping Qms 

Electromagnetic Damping - QES 

Total Damping - QTS 

Equivalent Compliance Volume - VAS 

Suspension Compliance Cms 

Effective Moving Mass - Mms 

Mechanical Resistance Rms 

Voice Coil Diameter 

Voice Coil Length 

Voice Coil Nominal Resistance 

Voice Coil Nominal Impedance 

Voice Coil Maximum Travel
Peak to Peak 

Magnet Total Flux 0 

Magnet Flux Density - B 

Magnet BI Product - BI 

Magnet Gap Length 

Magnet Gap Volume 

Diaphragm Effective Area - So 

Diaphragm Surround Type 

Overall Diameter 

Overall Depth 

Rear Mount Baffle Hole Diametel 

Front Mount Baffle Hole Diameter 

Front Mount Rebate Depth 

Mounting Hole P.C.D. 

Mounting Hole Size x Qty 

Shipping Weight 

Pack Size 
 

SM75-150

91 

75 

150 

300 

Up to 5k 
 

380 to 3k8 

320 
 
 
 
 
 
 
 
 
 
 
 
 

75 

3.5 

8.5 

12 
 

1.9 

1.6 
 
 

5.0 
 
 

50 

Fabric 

190x162 

94 

154 
 
 
 
 

172

M6 x 4 

25x25x16 
 

SM75-150SUPER
This is used in Project6
94 

75 

150 

300 

Up to 5k 
 

380 to 3k8 

320 
 
 
 
 
 
 
 
 
 
 
 
 

75 

3.5 

8.5 

12
 

2.5 

2.1 
 
 

5.0 
 
 

50 

Fabric 

190x162 

92 

154 
 
 
 
 

172

M6 x 4 

25x25x16 
 

UNITS

db@1w@1m 

Watts 

Watts 

Watts 

Hz 
 

Hz 

Hz 
 
 
 
 
 

Litres 

X 10-4 m/N 

gms 

N S/M5 

mm 

mm 

Ohms 

Ohms
 

mm 

X10-3 Wb 

Tesla 

N/A 

mm 

X10-6M3 

cm 2
 
 

mm 

mm 

mm 

mm 

mm 
 

mm 
 

kg 

cm 
 

BASS UNIT IN PROJECT 6
 
 
 

Technical Specification For SB100-375
SPECIFICATION

Sensitivity 

Nominal Power Rating 

Maximum Input Power 

Maximum Programme Power 

Usable Frequency Range 

Recommended Crossover
Frequencies in System 

Nominal Free Air Resonance fs 

Mechanical Damping Qms 

Electromagnetic Damping - QES 

Total Damping - QTS 

Equivalent Compliance Volume - VAS 

Suspension Compliance Cms 

Effective Moving Mass - Mms 

Mechanical Resistance Rms 

Voice Coil Diameter 

Voice Coil Length 

Voice Coil Nominal Resistance 

Voice Coil Nominal Impedance 

Voice Coil Maximum Travel
Peak to Peak 

Magnet Total Flux 0 

Magnet Flux Density - B 

Magnet BI Product - BI 

Magnet Gap Length 

Magnet Gap Volume 

Diaphragm Effective Area - So 

Diaphragm Surround Type 

Overall Diameter 

Overall Depth 

Rear Mount Baffle Hole Diametel 

Front Mount Baffle Hole Diameter 

Front Mount Rebate Depth 

Mounting Hole P.C.D. 

Mounting Hole Size x Qty 

Shipping Weight 

Pack Size 
 

SB100-375SC 

91 

100 

200 

400 

Up to 3k 
 

Up to lk 

30 

2.1

0.38 

0.32 

380 

2.7 

85 

9.1 

100 

5.4 


 

25 

5.0 

1.0 

15 

16 

13 

980 

Foam 

396 

150 

360 

355 

15 

370 

M6 x 8 

18 

46x46x23 
 

UNITS

db@1w@1m 

Watts 

Watts 

Watts 

Hz 
 

Hz 

Hz 
 
 
 
 
 

Litres 

X 10-4 m/N 

gms 

N S/M5 

mm 

mm 

Ohms 

Ohms 
 

mm 

X10-3 Wb 

Tesia 

N/A 

mm 

X10-6M3 

cm 2
 
 

mm 

mm 

mm 

mm 

mm 

mm 
 
 

kg 

cm 
 

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