YORKVILLE AP4020 Owner's Manual

Also see for ap4020 ys4020: Service manual Service manual

Contents

3CLIP LEDSThe CLIP LEDS on the front panel will visibly indicate any sig-nal excursion beyond the dynamic headroom of the amplifier.RELIABILITYThe AP4020/4040 is designed and manufactured byYorkville Sound. Each unit undergoes a thorough, temperaturecycled burn-in period, and each circuit is tested by both man-ual and sophisticated computer controlled equipment which iscapable of identifying any deviation from the design centerparameters. The design of the AP4020/4040 is conservativewith respect to the power handling capabilities of the outputdevices. The topology guarantees that thermal stress not sec-ondary breakdown will set the limits of operation, while thecomputer optimized heat dissipation system insures thatexcessive thermal stress will not occur. Yorkville’s reputationas a manufacturer of reliable equipment will be furtherenhanced by the AP4020/4040.The AP4020/4040 is not only suitable for use in both heavyduty touring sound reinforcement systems but also whenhigh headroom and low distortion are needed to fully repro-duce the dynamic range and clarity of today’s CD record-ings. It is built to survive grueling road conditions and con-stant 2 Ohm (4 Ohm in the AP4040) operation. Its reliabilityin a fixed installation running 4 or 8-Ohm studio monitors iswithout parallel.OUTPUT CONNECTIONSWARNING: When driven to full power in Bridge Mode. There is morethan 100Vrms appearing between the binding posts. This representsa significant shock hazard and due care should be taken when mak-ing any speaker connections. Ensure that no strands of bare con-ductor are exposed after inserting the speaker wire into the hole inthe side of the binding post terminals.The AP4020/4040 has 5–way binding posts and Neutrikfour contact Speakon™ connectors for output speaker connec-tions. Connection to the binding posts can either be madewith a banana plug inserted into the end of the post.There are two Speakon™ connectors. The Speakons™ areconnected to the amplifier’s outputs whether the amplifier isin stereo, mono, or bridge modes. Each Speakon™ outputconnector (output A and output B) is wired in parallel with it’srespective binding posts for two channel two cable connec-tions (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 ampli-fier in bridge mode where the speaker is connected across thepositives of each amplifier output. Configure the mode switchfor bridge and connect the speaker to pins +1 and +2 of thebridge/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). Connectionconfigurations are labeled on the back panel.AP4020 AP4040Both Channels DrivenLoad 1KHz 1KHz 1KHz 1KHz(Ohms) Cont. Avg. Burst Cont. Avg. Burst2-Ohm Mode 2-Ohm Mode 4-Ohm Mode 4-Ohm Mode8 475 625 750 12004 750 1200 1200 21752 1200 2175 n/a n/aBridge ModeLoad 1KHz 1KHz 1KHz 1KHz(Ohms) Cont. Avg. Burst Cont. Avg. Burst2-Ohm Mode 2-Ohm Mode 4-Ohm Mode 4-Ohm Mode8 1500 2400 2400 43504 2400 4350 n/a n/a2 n/a n/a n/a n/aPOWER OUTPUTAll values are in WATTS. Measurements were made at the 0.1% distortion point. Some CONTINUOUS AVER-AGE POWER measurements required line currents greater than 15 Amps. The amplifier under test was pluggedinto an IDEAL POWER LINE consisting of a REGULATED 120 VAC RMS 60 Hz pure sine wave. Ordinary AC“wall outlet” lines will always exhibit varying and unpredictable amounts of sag. To produce objectively verifiableand accurate specifications these unknown factors must be eliminated by using an ideal AC line. When using anordinary electrical outlet, it will usually be possible to get 2400 Watts when the AP4020is bridged into 4-ohms(AP4040 bridges at 8-Ohms).The BURST measurements use a 10mS burst at 1KHz with a 1/8 second pausebetween bursts. The 1KHz burst represents the maximum possible sine wave output power.