YORKVILLE AP1020 Owner's Manual

Also see for AP1020: Service schematics Service manual

Contents

YORKVILLE AP1020 Owner's Manual Manual pdf 5 page image

Clip LEDsThe Clip LEDs on the front panel will visibly indicate any signalexcursion beyond the dynamic headroom of the amplifier.ReliabilityThe AP1020 is designed by Yorkville Sound. Each unit undergoesa thorough, temperature cycled burn-in period, and each circuit istested by both manual and sophisticated computer-controlled equip-ment, which is capable of identifying any deviation from the designparameters. The design of the AP1020 is conservative, with respect tothe power handling capabilities of the output devices. The topologyguarantees that thermal stress, not secondary breakdown, will set thelimits of operation while the computer-optimized heat dissipationsystem insures that excessive thermal stress will not occur.The AP1020 is not only suitable for use in both heavy duty touringsound reinforcement systems but also when high headroom and lowdistortion are needed to fully reproduce the dynamic range and clar-ity of today’s CD recordings. The AP1020 is built to survive gruelingroad conditions and constant 2-ohm operation. Its reliability is a fixedinstallation running 4 or 8-ohm studio monitors is without parallel.Output ConnectionsThe AP1020 has 5-way binding posts and Neutrik four con-tact Speakon™ connectors for output speaker connections.Connection to the binding posts can either be made with abanana plug inserted into the end of the post.There are two Speakon™ connectors. The Speakons™ are con-nected to the amplifier’s outputs whether the amplifier is in Stereo,Mono or Bridge modes. Each Speakon™ output connector (OutputA and Output B) is wired in parallel with its respective binding postsfor two channel two cable connections (figure 1).Speakon™ Output A also doubles as the A-B/Bridge connec-tor. This Speakon™ contains both channels on one connector.This is convenient when connecting one speaker to the amplifierin bridge mode where the speaker is connected across the posi-tives of each amplifier output. Configure the Mode switch forBridge and connect the speaker to pins +1 and +2 of the bridge/biamp Speakon™ (figure 3).To connect a biamp speaker, configure the amplifier for Stereoand connect to the bridge/biamp connector but use all four ter-minals in the Speakon™ connector which will connect A and BOutputs separately to the speaker (figure 2). Connection configu-rations are labeled on the back panel.Impedance Mode SwitchThe AP1020 comes factory-configured to deliver its maximumpower into a 2-ohm load. However, it is possible to switch yourAP1020 to deliver its maximum power into 4-ohms. The switch islocated on the rear panel above the line cord. To prevent damageto the amplifier’s circuitry, only switch modes when the amplifi-er’s power switch is off. This feature is meant to be used when thespeaker load is known. Please Note: In the 4-ohm configuration,the minimum load per channel is 4-ohms. The minimum Bridgeload is 8-ohms. Attempting to operate into 2-ohm loads while inthe 4-ohm configuration will cause the amplifier to go into currentlimit, thermal limit or both.The Power specification chart in this manual shows the powersthat can be obtained for various configurations and loads.1 kHz Burst2-ohm Mode 2-ohm Mode 4-ohm Mode 4-ohm Mode8 180 200 280 3104 310 380 500 5902 520 650 n/a n/a2-ohm Mode 2-ohm Mode 4-ohm Mode 4-ohm Mode8 165 250 250 2904 270 350 400 5602 400 600 n/a n/a2-ohm Mode 2-ohm Mode 4-ohm Mode 4-ohm Mode8 550 700 840 11004 840 1200 n/a n/a2 n/a n/a n/aAll values are in Watts. Measurements were made at the 0.1% distortion point. Some continuousaverage power measurements required line currents greater than 15 amps. The amplifier under testwas plugged into an ideal power line consisting of a Regulated 120 VAC RMS 60 Hz pure sinewave. Ordinary AC wall-outlet lines will always exhibit varying and unpredictable amounts of sag.To produce objectively verifiable and accurate specifications these unknown factors must beeliminated by using an ideal AC line. When using an ordinary electrical outlet, it will usually bepossible to get 800 Watts when the AP1020 is bridged into 4-ohms. The burst measurement uses a10 ms burst at 1 kHz with a pause of 1/8 second between bursts. The 1 kHz burst represents themaximum possible sine wave output power.One Channel DrivenPower OutputLoad(ohms) 1 kHz Cont.Average 1 kHz Burst1 kHz Cont.Average1 kHz BurstLoad(ohms) 1 kHz Cont.Average 1 kHz Burst1 kHz Cont.Average1 kHz BurstLoad(ohms) 1 kHz Cont.Average 1 kHz Burst1 kHz Cont.AverageBoth Channels DrivenBridge Mode