EAW KF730, SB730 Input Connections, Selecting an Appropriate Amplifier Size Rule Of Thumb

5.7.3Selecting an Appropriate Amplifier Size Rule Of Thumb

If a KF730 Line Array is used for professionally operated concert applications, a rule of thumb can be applied. Where the full output capabilities of the loudspeakers may be needed to achieve appropriate acoustic output levels, EAW recommends amplifiers with power ratings up to twice the wattages listed in the above charts. This provides a peak voltage capability of 6 dB above the specified rms voltage limit. This assumes the audio signals will have a peak to average ratio in excess of 6 dB, which is usually, but not always, true. Under this condition, the thermal limits are unlikely to be exceeded. While this rule of thumb is consistent with the EAW’s testing parameters, it does NOT guarantee trouble-free operation. That is discussed under “Operating Limits.”

WARNING: The power amplifier sizes recommended by the above rule of thumb are capable of continuous output levels that can cause damage to or failure of the transducers. Exercise caution in operation to avoid exceeding the specified maximum rms voltage limits.

In some cases, applying this rule of thumb to the power ratings listed in Section 5.7.1, would indicate impractical amplifier sizes, such as 11,200 W for the LF section of eight KF730s. In such cases, multiple amplifier channels each powering fewer KF730s would be more practical.

5.7.4Operating Limits

It is the responsibility of the audio system operator to operate the loudspeakers within their capabilities. This is the only way to ensure that loudspeakers are not stressed beyond their limits to the point of damage or failure.

Operation beyond their capabilities usually includes, but is not limited to, one or more of the following conditions:

Amplifier clipping

Voltage input in excess of the specified rms voltage limit

Peak voltage input in excess of twice the specified voltage limit

Noticeable distortion

Mechanical noise (such as cones bottoming out)

A suitable means for determining these conditions is highly recommended. At a minimum, the operator should have a meter display calibrated to indicate when the maximum rms voltage limits will be exceeded. This assumes amplifiers are not being driven into clipping at those limits.

5.8INPUT CONNECTIONS

5.8.1KF730 Input Connections

There are two Neutrik NL4MP connectors on the rear of each KF730. The connectors mate with Neutrik NL4FC in-line cable connectors.

KF730 INPUT NL4 (each of two)

PIN 1-	LF-
PIN 1+	LF+
PIN 2-	MF/HF-
PIN 2+	MF/HF+

1.Use as the input to the KF730

2.Use the second connector to loop the LF and MF/HF signals to the next KF730.

Page 12 of 28 RD0169 (A) KF730 & SB730 OWNER’S MANUAL