YORKVILLE Audiopro 3400 Owner's Manual

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Contents

YORKVILLE Audiopro 3400 Owner's Manual Manual pdf 4 page image

Page 3OWNERS MANUAL / GUIDE D' OPERATIONIn large installations it is often necessary to operate many amplifiers in parallel. SeveralAUDIOPRO 3400 may be paralleled by patching from the unused input jack of the firstamp to the second amp’s input, and so on down the line. The original source must driveall of the amplifiers. Eighteen AUDIOPRO 3400 channels would present a load of about600 Ohms. Any source capable of driving a 600 Ohm line to +15 dBm should be ableto drive this load with no problem.For best results, daisy chaining should be done with balanced patch cords. Groundloop hum can be eliminated by lifting the ground straps of all but the first amplifier in thechain.Removing the ground strap on the rear panel will decouple chassis ground from circuitground. Safety (“earth”) ground is still connected to the chassis. We do notrecommend lifting the ground strap unless you are experiencing problems with groundloop hum in multiple amplifier setups where lifting the ground straps of all but oneamplifier cures the hum problem. Caution: Sometimes hum problems are an indicationof improper AC wiring somewhere else in your system. Don’t just doctor the symptomby lifting grounds: Fix the cause by making sure that the proper electrical wiring safetyregulations have been adhered to.Historically, bridged mode operation was a means of getting high power from mediumpower amplifiers. The AUDIOPRO 3400 delivers more power from one channel thanmost other amps deliver when fully bridged. Bridging the AUDIOPRO 3400 willreproduce music with a headroom of about 4500 Watts into a 8 ohm load! We don’tknow of any subwoofers that can handle such power. We recommend that youcarefully check the ratings of your speaker system against the power specificationslisted in this manual before you consider bridging the AUDIOPRO 3400.We have purposefully made it a little difficult to bridge the AUDIOPRO 3400. You needto construct a special crossed-phase balanced cable. If your input cable is a balancedXLR, you will need a stereo phone cable with the ring connection of one end going tothe tip of the other end, and the ring of that end going to the tip of the first end. If yourinput cable is a phone plug, then you need to make an XLR patch cord with pin 2 of oneend going to pin 3 of the other, and pin 3 of that end going to pin 2 of the first end. SeeFig, #3. Connect the special cable from channel “A” to channel “B”. Connect the inputto your AUDIOPRO 3400 to channel “A”. Put the STEREO/MONO switch in STEREOposition. Connect your speaker between the two RED binding posts. (The resultingphase polarity is marked on the panel).You MUST set both front panel gain controls to the same position for bridged operationto work properly. Failure to do this will result in premature current limiting and willproduce less power than is produced in non bridged mode's.Again a word of CAUTION: Yorkville’s own high power speaker systems have circuitbreaker protection built in. Although they may shut down, they are unlikely to bedamaged by a bridged AUDIOPRO 3400. However, many other speaker manufactur-ers make high power cabinets with no protection features whatsoever. Yorkville SoundDAISY CHAININGGROUND STRAPBRIDGED OPERATION