Inputs, Ground Switch, Remote Referencing

Introduction

Your new Yorkville AP1020 power amplifier has been designed and built to provide years of trouble free performance. The AP1020 starts with the field-proven reliability of our Audiopro amplifiers and customer requested features like switchable limiters and a Mono/Stereo/Bridge switch. We’ve made the AP1020 power configurable, (see Power Configuration), which makes it one of the most versatile amp in its class.

The AP1020 weighs a comfortable, but solid, 39 pounds; it fits into two rack spaces and reproduces music with over 1200 Watts of headroom. It will drive reactive phase shifted loads with no difficulty - even though it is fully protected from accidental short circuits. Our design goal was to create an amplifier, which would do exactly what an amplifier should do: reproduce music with great power, complete reliability, and uncompromising signal fidelity. We think you will agree that the Yorkville AP1020 does exactly that. We hope this manual will provide answers to any questions you may have about the features, controls, and characteristics of this amplifier.

Inputs

Balanced Inputs

Either XLR or two circuit Ring, Tip, Sleeve stereo ¼-inch PHONE cords may be used. Each channel’s XLR input is internally par- alleled with its phone input: The Tip of the Channel A Phone input is connected to pin 2 of its XLR input, the Ring is con- nected to pin 3, and the Sleeve is connected to pin 1. Pin 2 is in phase, pin 3 is 180 degrees out of phase, and pin 1 is ground. We recommend using balanced lines for the best hum-free per- formance, particularly when chaining multiple amplifiers.

Unbalanced Inputs

Ordinary single circuit standard 1/4 inch phone plugs may be used to connect unbalanced signals. Important Note: Such plugs effectively connect the ring terminal to sleeve ground, so they work correctly. However, if you use a stereo ¼-inch phone plug on an unbalanced line, you must short the ring ter- minal to the sleeve terminal, otherwise the sensitivity will be 6 dB lower than is specified! (The same applies to the XLR input; to connect an unbalanced source via the XLR input, you must connect the signal to pin 2 and ground both pin 1 and pin 3).

as an output to the next amplifier. Obviously you will need both XLR-to-XLR and phone-to-phone patch cords if you are going to tandem more than two amplifiers.

Note: These patch cords must be balanced whether the input signal is balanced or unbalanced!

Ground Switch

Switching the ground switch on the rear panel will disconnect chassis ground from circuit ground. Safety (earth) ground is still connected to the chassis. We do not rec- ommend lifting the ground strap unless you are experiencing problems with ground loop hum in multiple amplifier setups where lifting the ground straps of all but one amplifier cures the hum problem.

CAUTION: Sometimes hum problems are an indication of improper AC wiring somewhere else in your system. Don’t just doctor the symptom by lifting grounds. Fix the cause by making sure that the proper electrical wiring safety regula- tions have been adhered to.

Remote Referencing

You can approach balanced performance with unbalanced sources by utilizing the remote reference feature of the AP1020 Connect a balanced cable to the AP1020 just as you would if you were run- ning a balanced line. At the other end, connect pin 3 and pin 1 together, (or connect ring to sleeve if you are using a phone plug cable), and plug this modified end into your unbalanced piece of equipment. This connection enables the AP1020’s input to “look” down the cable directly at the output jack of the unbalanced equip- ment. Any hum voltage generated across the cable’s impedance will be attenuated by the common mode rejection of the AP1020.

Driving Multiple AP1020s

In large installations it is often desirable to operate many amplifi- ers in tandem. Since each channel’s XLR input is internally paral- leled with its phone input, you may use the remaining input jack

Modes

The AP1020 can be configured for dual-Mono, Stereo, or Bridged Mono operation via this rear panel Mode switch. The following is a description of each mode:

Mono Mode

•Channels A and B inputs are paralleled

•Each gain control adjusts the signal level for its respective channel

•Output signals are of equal phase.

•Two loads are driven.

•Loads are connected between the black and red post on each channel.

AP1020 specifications

The Yorkville Sound AP1020 represents a significant advancement in the world of portable audio reinforcement systems. With its impressive combination of power, versatility, and sound quality, the AP1020 is designed to meet the demands of both professional sound engineers and hobbyists alike. This speaker is particularly well-suited for worship spaces, corporate events, and live music performances, providing a reliable and high-quality audio solution for a variety of settings.

One of the key features of the AP1020 is its robust construction. The speaker is housed in a durable plywood cabinet that ensures longevity and resilience against wear and tear. This rugged design is complemented by a black carpet finish that not only enhances its aesthetic but also helps in reducing scratches while transporting the unit. Furthermore, its compact form factor makes it easy to load into vehicles and set up at venues, making it an ideal choice for mobile applications.

The AP1020 is equipped with a powerful 10-inch woofer and a 1-inch compression driver. This combination delivers clear and full-range sound reproduction across a frequency response of 65 Hz to 20 kHz. The speaker’s high sensitivity rating ensures it can reach impressive sound levels without distortion, a characteristic that is vital for live sound environments. Additionally, the combination of the woofer and compression driver enables the AP1020 to perform exceptionally well in both indoor and outdoor settings.

Another standout technology integrated into the AP1020 is its onboard amplification. The internal amplifier provides a substantial amount of power, enabling the speaker to output a great volume while maintaining audio clarity. This feature is particularly advantageous in large venues where sound projection is essential.

The speaker also boasts multiple input options, including XLR and TRS connections, making it versatile enough to accommodate various audio sources. This connectivity enhances its usability, allowing it to work seamlessly with mixing consoles, instruments, or playback devices.

For those in need of additional sound control, the AP1020 includes a range of EQ options, allowing users to tailor the audio output to suit specific environments and listener preferences. This level of customization makes it an accessible choice for users with varying expertise in audio engineering.

In conclusion, the Yorkville Sound AP1020 is a powerful and flexible loudspeaker that packs a punch without compromising on quality. Its durable design, outstanding sound reproduction capabilities, comprehensive connectivity options, and practical features make it a reliable choice for both professional and casual users looking to elevate their audio experience.