K and KW wiring configurations explained

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Introduction

K and KW loudspeakers are easily configurable to work with almost any sound system. There are many connection types on the loudspeaker. This document will explain the connection types, provide signal flow block diagrams, and show some typical wiring configurations.

Amplifier module connections

Input connections
There are three connection types that the K and KW series loudspeakers accept: balanced XLR, balanced 1/4” TRS (unbalanced 1/4” TS will also work), and RCA. The audio input signal will contain your program material or source. In portable audio applications, this source can come from various sources including:

  • Multi-channel mixer or DJ mixer
  • Microphone
  • Guitar or other instrument
  • CD/MP3/portable music player

Input sources should only be connected to these jacks. They are reserved for inputs only.

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Output connections

There are two output connection types on the K and KW series loudspeakers: XLR direct output and XLR post gain mix output (labeled line out). Direct XLR outputs are direct connections of the XLR and 1/4” input above it. In other words, the direct output is unprocessed without any resistive or capacitive elements between the input and output XLR connections. The direct output signal will be exactly the same as the input signal. The main reason for direct outputs is so that you can connect any QSC powered loudspeaker to each other, often called daisy chaining, without any care of the sequencing subwoofers and top boxes. 

The XLR post gain mix output, which is only available on top box K and KW models, is a “mixed” output of the Channel A, Channel B, and RCA input connections. This mix is affected by the gain knobs and MIC/LINE switch. There is no EQ or DSP processing applied to the post gain mix output. The LF and HF switch settings have no affect on this output. This functionality turns the K and KW series loudspeaker into a very compact and simple two-channel mixer. The post gain mix output should only be used when you want to take the mixed output of Channel A, Channel B, or RCA inputs.

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Remote gain

This connection is intended for installed applications. The green terminal block, also referred to as a euro connector, is used to remotely control the gain of the speaker(s) from an external source. This is not be confused with an infrared remote that controls your TV. This is extremely useful for applications where you have mounted the speakers to a wall or ceiling, making it difficult to access and adjust the gain knobs on the rear of the loudspeakers, or where you need to control separate zones or loudspeaker groups. You can simply mount the remote pot on a wall plate in a convenient location and wire it to the supplied Euro-style connector on the rear of each K Family loudspeaker(s).

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A potentiometer is connected to the male terminal block, which is then plugged into the female terminal block on the back of the speaker. The value of the external pot is not critical—any pot with a total resistance of 1 kΩ up to 50 kΩ and a linear taper will be fine. These are typically quite inexpensive and available from just about any electronics parts supplier. If you do plan to connect more than 20x loudspeakers together, we recommend using a lower value potentiometer (less than 5 kΩ).

 

Signal flow block diagrams

K8/K10/K12

k8-k10-k12_blockdiagram.PNG

KSub

ksub_blockdiagram.PNG

KW122/152

kw122kw152_blockdiagram.PNG

KW153

kw153_blockdiagram.PNG

KW181

kw181_blockdiagram.PNG


Typical wiring configurations


Common stereo system: 1 subwoofer, 2 top boxes, and 1 stereo source (mixer)

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Common stereo system: 2 subwoofers, 2 top boxes, and 1 stereo source (mixer)

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Common stereo system: Multiple subwoofers, multiple top boxes, and 1 stereo source (mixer)

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Common standalone system: Multiple speakers and 1 mono source

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Common standalone system: Multiple speakers and 1—3 sources (no mixer)

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Live bar sound reinforcement: FOH speakers, monitor speakers, and 1 stereo source (mixer)

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