YORKVILLE Audiopro 3400 Owner's Manual

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Contents

YORKVILLE Audiopro 3400 Owner's Manual Manual pdf 3 page image

Page 2OWNERS MANUAL / GUIDE D' OPERATIONAll amplifiers with ratings above 1400 watts rely on the fact that the average powerrequired to reproduce music is considerably below the maximum power the amplifieris capable of providing. Some amplifiers are capable of actually delivering their ratedpower continuously, but these may consume as much as 50 amperes in doing so. Toget around this problem, many high power amplifiers are shipped with either a specialhigh current plug on the line cord or with two line cords. In practice, the user is oftenforced to find some way to connect these products to standard line outlets. Due to thelower average power required by music, this will sometimes work, but there is thepossibility that circuit breakers in the concert hall will trip in the middle of a performance.The AUDIOPRO 3400 is internally capable of delivering its rated power on a continuousbasis. However, rather than leaving the question of energy management to chance, theAUDIOPRO 3400 incorporates active energy management circuitry which continuouslymonitors the actual power consumed from the AC line. Should that exceed an averageof 12 amperes over a sustained period, the AUDIOPRO 3400 will reduce its outputpower and therefore its power consumption accordingly. The reduction required isvery small: A drop in output power of 3 dB will reduce the power consumption to below12 amperes in even the most extreme cases. Under prolonged actual tests withcontinuous and compressed music driving two ohm speaker loads connected to eachchannel, the AUDIOPRO 3400 consumed less than 10 amperes on average, and theenergy management circuit was never activated. (This performance is due in largemeasure to the high efficiency of the AUDIOPRO 3400’s output circuitry: Otheramplifiers draw considerably more power under identical conditions!) It is nice to knowthat an AUDIOPRO 3400 will probably never cause a nuisance trip of a breaker.The AUDIOPRO 3400 is a high efficiency amplifier which is capable of delivering agreater percentage of its input power to the speaker load than most other amplifiers.Under actual operating conditions its power conversion efficiency approaches that ofdigital switching amplifiers. However, digital switching amps are still plagued by poorspecifications and cumbersome operating constraints. The AUDIOPRO 3400 providesthe superior transient response and low distortion figures associated with the best andmost reliable analog designs.The AUDIOPRO 3400 accepts either balanced or unbalanced inputs. Either XLR orPHONE cords may be used. XLR cords are normally used for balanced operation.However, stereo PHONE cords may also be used. Internally, the AUDIOPRO 3400inputs are simply wired in parallel: The TIP of the channel “A” PHONE input isconnected to pin 2 of its XLR input, the RING is connected to pin 3, and the SLEEVE isconnected to PIN 1.This switch simply connects the inputs of channel “A” directly to the inputs of channel“B”. A signal connected to either channel thus is routed to both amplifiers. Fig,#2- 2INPUTS andSWITCHESENERGYMANAGEMENTSYSTEMMONO/STEREO