RCF TTW 4-A OWNER'S MANUAL

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IMPORTANT NOTE: The following presets are valid for TTL C4-A, TTP C4-A and TTW C4-A only.

Since TTx C4-A speakers are studied to be used in clusters, the usual RCF line array preset management is considered.

LOW FREQUENCY PRESET

In the low frequency range the interaction between the sound of single cabinets produces an

increase of sound level in low frequencies proportional to the number of loudspeakers in the

cluster. This effect unbalances the global equalization of the system: the interaction between the

loudspeakers decreases, increasing the frequency (they become more directive).

For the control of the displacement described above it is necessary to progressively reduce the

low frequencies level in the global equalization reducing the gain if the frequency decreases

(low shelf ﬁlter).

The preset is suggested considering the number of the cabinets in the cluster: the ﬁnal tuning

of the system should be done with measurements and listening sessions, considering the

environmental conditions.

HIGH FREQUENCY PRESET

The sound propagation, in particular the high frequencies (1.5 KHz and up), depends essentially

on the conditions of the air in which it travels. We can generally afﬁrm that air absorbs high

frequencies and the amount of absorption depends on temperature, humidity and the distance

that sound covers.

The decibel decrease is well modelled by a mathematical formula that combines the three

parameters (temperature, humidity and distance) giving a proﬁle of the absorption in function

of the frequency.

In the case of a loudspeaker cluster the goal is the audience coverage with the best possible

uniformity, obtainable only by compensating for the absorption introduced by air. It is easy to

understand that every cabinet should be compensated differently from the other array cabinets

because the compensation should consider the distance at which the cabinet is aiming.

The compensation should be translated in terms of decibels that should be progressively added

with the increase of high frequencies.

There are 4 groups of 4 prestes, making a total of sixteen presets:

C - CLOSE (C1, C2, C3, C4)

When the listening distance is less than 8 meters.

M - MEDIUM (M1, M2, M3, M4)

When the listening distance goes from 8 to 16 meters.

F - FAR (F1, F2, F3, F4)

When the listening distance goes from 16 to 32 meters.

H - HIGH DISTANCE (H1, H2, H3, H4)

When the listening distance is more than 32 meters.

The number following the letter stands for the number of speakers on the cluster.

PART 2 | 8. PRESETS

TTL C4-A, TTP C4-A, TTW C4-A

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RCF TTW 4-A WIDE DIRECTIVITY ACTIVE TWO-WAY SPEAKER