YORKVILLE AP2020 Owner's Manual

Also see for AP2020: Service manual Service manual Owner's manual

Contents

The AP2020 is not only suitable for use in both heavy dutytouring sound reinforcement systems but also when high head-room and low distortion are needed to fully reproduce thedynamic range and clarity of today’s CD recordings. It is builtto survive grueling road conditions and constant 2-ohm opera-tion. Its reliability in a fixed installation running 4 or 8-ohmstudio monitors is without parallel.Output ConnectionsWARNING: When driven to full power in Bridge Mode hereis more than 70 Vrms appearing between the binding posts.This represents a significant shock hazard and due careshould be taken when making any speaker connections.Ensure that no strands of bare conductor are exposed afterinserting the speaker wire into the hole in the side of thebinding post terminals.The AP2020 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 aforked lug on the post’s neck or banana plug inserted into theend of the post.There are three Speakon™ connectors, one for each channeloutput and a third for bridge/bi-amp connections. All threeconnectors are connected to the amplifier’s outputs whetherthe amplifier is in stereo mono or bridge modes. Connectionconfigurations are labeled on the back panel. Each Speakon™output connector (output A, output B) is wired in parallel withit’s respective binding posts for two channel two cable con-nections (figure 1).The Bridge/Bi–amp connector contains both channels onone connector. This is convenient when connecting onespeaker to the amplifier in bridge mode where the speakeris connected across the positives of each amplifier output.Configure the mode switch for bridge and connect the speakerto pins +1 and +2 of the bridge/bi-amp Speakon (figure 3).To connect a bi-amp speaker, configure the amplifier forstereo and connect to the bridge/bi-amp connector but use allfour terminals in the Speakon connector which will connect Aand B outputs separately to the speaker (figure 2).Impedance Mode SwitchThe AP2020 comes factory configured to deliver it’s maxi-mum power into a 2-ohm load. However, it is possible toswitch your AP2020 to deliver it’s maximum power into 4-ohms. The switch is located on the rear panel above the linecord. 2-ohm mode is selected if the switch is in the LEFT posi-tion, 4-ohm mode is selected if the switch if the switch is in theright position. To prevent damage to the amplifier’s circuitryONLY switch modes when the amplifier’s power switch is OFF!This feature is intended to be used where the load is known.PLEASE NOTE: In the 4-ohm configuration, the minimumload per channel is 4-ohms and the minimum BRIDGE loadis 8–ohms. Attempting to operate into 2-ohm loads while inthe 4-ohms configuration will cause the amplifier to go intocurrent limit, thermal limit, or both. The power specificationchart in this manual shows the powers that can be achievedfor various configurations and loads.Power OutputAll values are in WATTS. Measurements were made atthe 0.1% distortion point. Some CONTINUOUS AVERAGEPOWER measurements required line currents greater than15 Amps. The amplifier under test was plugged into anIDEAL POWER LINE consisting of a REGULATED 120 VACRMS 60 Hz pure sine wave. Ordinary AC “wall outlet” lineswill always exhibit varying and unpredictable amounts ofsag. To produce objectively verifiable and accurate specifi-cations these unknown factors must be eliminated by usingan ideal AC line. When using an ordinary electrical outlet, itwill usually be possible to get 2400 Watts when the AP2020is bridged into 4 ohms. The BURST measurements usea 10mS burst at 1KHz with a 1/8 second pause betweenbursts. The 1KHz burst represents the maximum possiblesine wave output power.One Channel DrivenLoad 1KHz 1KHz 1KHz 1KHz(ohms) Cont. Avg. Burst Cont. Avg. Burst2-ohm Mode 2-ohm Mode 4-ohm Mode 4-ohm Mode2-ohm Mode 2-ohm Mode 4-ohm Mode 4-ohm Mode2-ohm Mode 2-ohm Mode 4-ohm Mode 4-ohm Mode8 330 350 425 4754 550 650 725 8702 850 1050 n/a n/aBoth Channels DrivenLoad 1KHz 1KHz 1KHz 1KHz(ohms) Cont. Avg. Burst Cont. Avg. Burst8 250 350 400 4504 460 650 615 8002 650 1050 n/a n/aBridge ModeLoad 1KHz 1KHz 1KHz 1KHz(ohms) Cont. Avg. Burst Cont. Avg. Burst8 950 1200 1250 16004 1300 2100 n/a n/a2 n/a n/a n/a n/aMODE SWITCH2-ohm 4-ohm