INSTALLER INFORMATION
Enclosures
The internal volume of an enclosure is directly related to the amount of low-frequency extension and output that can be accurately reproduced by a loudspeaker. The CAS in-wall loudspeakers were designed to use the typical wall cavity dimensions of 8' x 14-1/2" x 3-1/2" for maximum low-frequency extension. However, due to varying construction standards, materials and applications, it is sometimes beneficial to create a dedicated enclosure for the speakers. The charts below show the internal volumes of sample enclosures and the resulting –3dB points for each model.
CAS 3.1
Internal –3dB
Volume Frequency
2.7cu. ft. 32Hz
1.35cu. ft. 38Hz
CAS 2.1
Internal –3dB
Volume Frequency
2.7cu. ft. 40Hz
1.35cu. ft. 45Hz
It is important that the enclosures be well-constructed; MDF is recommended. The enclosure should be securely mounted to the adjacent wall studs. In addition, the enclosure should be filled with fiberglass insulation so that the enclosure is full, but the insulation is not compressed.
Thiele/Small Parameters
| | CAS 3.1 | | CAS 2.1 | |
Total Q | QTS | 0.71 | | 0.72 | |
| | | |
Compliance Volume | VAS | 72.3 liters | 43.1 liters |
| | | | | |
Free-Air Resonance | F | 34.8Hz | | 40Hz | |
| S | | | | |
Mechanical Q | QMS | 11.46 | | 11.27 | |
| | | | | |
Electrical Q | QES | 0.76 | | 0.77 | |
| | | |
Voice-Coil DC Resistance | RE | 4.06 ohms | 4.05 ohms |
| | | |
Moving Mass, Air Load | MMS | 34.79 grams | 23.10 grams |
| | | | | |
Suspension Compliance | CMD | 601um/N | | 671um/N | |
| | | |
Motor Force Factor | BL | 6.39 Tesla-M | 5.56 Tesla-M |
| | | | | |
Driver Radiating Area | S | 0.0293m | 2 | 0.0214m | 2 |
| D | | | | |
| | | | | |
