L-Acoustics LA8 User Manual
Also see for LA8: Owner's manualOwner's manualUser manualUser manualMaintenance manual
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Contents
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LA8 AMPLIFIED CONTROLLERUSER MANUALVERS ION 5.0LA 8_U M_E N_5 .0 w w w . l - a c o u s t i c s . c o m 1 63.3.4 Electrical generatorYou must power on the generator before powering on the amplified controllers.Verify that the amplified controllers are turned off before powering the generator on.Planning the power of the generator in kVATake the nominal values of the LA8, I and U. Look for the cos of the generator and its recommended operatingrange. Then apply the following formula: I x U / (cos x range).For instance, for LA8 in Europe, I = 16 A and U = 230 V. With a typical generator, cos = 0.8 and range = 70 %.Then the generator must be capable of delivering 16 x 230 / (0.8 x 0.70) = 6.5 kVA.3.3.5 Power plug The LA8 is supplied with a CEE 7/7 power plug (16 A / 250 V grounded). The LA8US is supplied with a NEMA L5-30P power plug (30 A / 125 V grounded). The LA8JP is supplied with the power plug selected by the Japanese distributor.Plug connectionStrictly apply the specific safety regulations of the country of use.Verify that the plug conforms to the specific voltage and current rating given in Table 1.Do not disable the ground connection of the supplied AC power cord using an adaptor or any other methods.A new fixed power panel with larger gauge wiring is quite often required to connect the LA8US so as to meetthe 30 A specification.If the power plug does not match the local power outlet, it can be cut off and wired to a suitable plug (refer tothe LA8 maintenance manual – level 1).3.3.6 Power consumptionThe LA8 power requirements depend on the load impedance and the signal level as indicated in the following table:Table 2: LA8 mains input power and current drawMaximum output power Mains input power and current drawLoad Number ofdriven channelsPower perchannel1/3 outputpower (-5 dB)1/8 outputpower (-9 dB) IDLE Standby4 Ω 4 1800 W 22 A / 3100 W 11 A / 1500 W 0.5 A /115 W< 0.1 A /12 W8 Ω 4 1100 W 15 A / 1950 W 10 A / 1300 WThe current values are given for a mains rated at 230 V. Multiply by 2 for 120 V, 1.15 for 200 V, and 2.3 for 100 V.If the voltage outsides a plus or minus 10 % range, the maximum power is no longer guaranteed.Output power referencesA third of the maximum output power corresponds to the worst case scenario of a program source using highlycompressed music or pink noise with amplifier driven to clip level.An eighth of the maximum output power corresponds to a loud music program with a small dynamic range and9 dB of headroom (IEC standard power rating).3.3.7 Example of heat power calculationConnect a 4 Ω load to each output channel of the LA8: each channel can now deliver a power of up to 1800 W.Consider a standard use at 1/8 of full power (9 dB headroom): the power delivered per channel is then 1800 / 8 = 225W, leading to a total power of 4 x 225 = 900 W for the LA8.According to Table 2 the LA8 power consumption is 1500 W: the heat power produced is then 1500 - 900 = 600 W(difference between power consumption and output power). |
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