Commercial Installation Solutions Speaker Calculator
Commercial Installation Solutions Speaker Calculator (CISSCA) is a software application that quickly calculates the number of speakers required for optimum performance in a room specified by the user, plus the effective sound pressure level of the system. The user specifies the room size, type of speakers to be used, and speaker layout.
- A fast, easy way to estimate the number of speakers required for any project.
- Easy setup and operation.
- Report output function provides convenient documentation for system proposals.
Page 1: Room size, speaker type and speaker layout are shown with the number of speakers required.
Page 2*: Sound pressure level maps for the calculated system (full range A-weighted and full range flat).
Page 3*: High-frequency, mid-frequency, and low-frequency sound pressure level maps for the calculated system.
* Color sound pressure level maps are not displayed when SPL map display is turned off.
It is important to note that the nominal coverage angle listed in ceiling speaker specifications is not the same as the speaker’s actual effective coverage angle. SPL at the nominal coverage angle is 6dB lower than the on-axis SPL, measured at a constant distance from the speaker. The effective coverage angle is defined as the angle at which the SPL is 6dB lower than the on-axis SPL at the listening plane. The effective coverage angle is usually about 70~80% of the nominal coverage angle. CISSCA calculations are based on effective coverage angles.
Uniform sound pressure level can easily be achieved throughout the listening plane with speakers that include by aligning the speaker's axis with the head of the most distant target (listener). This works because of the relationship between distance and coverage angle. When the perpendicular axis is aligned with the last row, the natural distance attenuation at the last row and the off-axis attenuation at closer rows tend to result in uniform SPL distribution. CISSCA allows fine adjustment of surface mount speaker tilt angle for maximum system design flexibility.
The colors and finishes shown may vary from those on the actual products.