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

Page 12

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

Page 11 Page 13
Image 12
Page 11 Page 13
Contents KF730 & SB730 Loudspeaker EAW Part RD0169Page Table of Contents Safety Precautions General PrecautionsRead this First EC Statement of ConformityContents IntroductionUnpacking Shipping DamageKF730 Array Design Fill CoverageGround Stacking SubwoofersSignal Delay on Subwoofers Other SubwoofersSystem Block Diagram Signal ProcessingArray Operation OverviewAmplifier Gain Settings User AdjustmentsAmplifier Power Requirements Selecting an Appropriate Amplifier Size KF730 QtyInput Connections Selecting an Appropriate Amplifier Size Rule Of ThumbOperating Limits 1 KF730 Input Connections2 SB730 Connections 3 SB730 System Input ConnectionsWire Gauge 4 KF730P Input Connections+ -- + 5 SB730P Input ConnectionsRigging Rigging WarningsSuspension Load Rating Working Load Limit WLL FLY-BAR Rigging Recommendations Attaching Enclosures to the FLY-BARQuick Release Pins Hinge and Hinge Tube HolesLocking Pins KF730 and SB730 Hinge and Hinge Tube HolesPallets Initial Rigging PreparationSuspension Procedures 1 KF730s On KF730 Pallet2 SB730s on SB730 Pallet Attaching a KF730 or SB730 to the Fly-BarAttaching SB730s to SB730s Already Suspended Attaching a KF730 to an SB730 Already SuspendedAttaching KF730s to KF730s Already Suspended Ground Stacking Procedures Setting the Tilt Angle for the Entire ArrayStacking With SB730s as the Base Stacking Additional Enclosures SB730 as the base Stacking With the Fly-Bar as the BaseStacking the First Enclosure Fly-Bar as the base Stacking Additional Enclosures Fly-Bar as the base Service Information Literature and SpecificationsContacting EAW Operating QuestionsService and Maintenance General ServiceRigging Service Basic Field TroubleshootingMaintenance Eastern Acoustic Works ONE Main Street WHITINSVILLE, MA
Top Page Image Contents