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Scan-Speak Illuminator 7" Paper Cone Woofer 18WU/8741T-00
- Under hung voice coil
- Neodymium magnet
- Exceptionally long linear excursion
- paper cone
- 8 ohm
The Illuminator woofers are based on compact under-hung motor systems with large neodymium ring magnets. The patent pending motor offers a very long linear excursion together with a very high force factor. The top plate is shaped to “guide” the backside airflow around the motor and with the very open cast aluminum chassis design the driver is virtually free from compression.
| Electrical Data |
| Nominal Impedance |
Zn |
8 |
ohm |
| DC Resistance |
Re |
5.9 |
ohm |
| Voice Coil Inductance |
Le |
0.41 |
mH |
| TS Parameters |
| Resonance Frequency |
fs |
31 |
Hz |
| Mechanical Q factor |
QMS |
3.51 |
|
| Electrical Q factor |
QES |
0.37 |
|
| Total Q factor |
Qts |
0.33 |
|
| Force Factor |
Bl |
7.5 |
Tm |
| Mechanical Resistance |
Rms |
1 |
Kg/s |
| Moving Mass |
Mms |
18 |
g |
| Suspension Compliance |
Cms |
1.46 |
mm/N |
| Effective Piston Area |
sd |
154 |
cm^2 |
| Equivalent Volume |
Vas |
49 |
ltrs |
| Sensitivity |
2.83V/1m |
85.4 |
dB |
| Power Handling |
| 100h RMS noise test |
IEC |
80 |
W |
| Long-Term Max Power |
IEC |
150 |
W |
| Voice Coil and Magnet Parameters |
| Voice Coil Diameter |
|
42 |
mm |
| Voice Coil Height |
|
8 |
mm |
| Voice Coil Layers |
|
4 |
|
| Height of the Gap |
|
20 |
mm |
| Linear Excursion +/- |
|
6 |
mm |
| Max mech. excursion +/- |
|
16 |
mm |
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Suggested Alignments:
Sealed box of 0.4 cubic feet for an F3 of 70Hz
Vented box of 0.5 cubic feet with a 2" diameter vent by 8" long for an F3 of 54Hz
Vented box of 0.75 cubic feet with a 2" diameter vent by 8" long for an F3 of 48Hz
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