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

 

 

 

 

 

 

 

 

 

 

CAS 3.1/CAS 2.1

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Infinity CAS 2.1, CAS 3.1 manual Installer Information, Enclosures, Thiele/Small Parameters