KA800 & KA1200 Operation Manual
IMPORTANT! Please read carefully. This operation manual contains important information regarding safety precautions, installation, performance, operation and maintenance of your KA- Series power amplifier. You should familiarize yourself with the contents of this manual before operating your amplifier.
Features: - Custom designed, 2RU heavy duty alloy chassis. - 1 Watt output indication (2.828 volts). - Open modular construction for ease of servicing. - 1 dB below output clip indication. - Symmetrical layout - even weight distribution. - Massive heat-sink / heat-exchangers. - Well-regulating, high current power supply. - Efficient front to back cooling. - High efficiency toroidal mains transformer. - Dual, twin speed axial fans.
Contents Page 1. 2. 3. 4. 5. 6. Introduction Controls, Connectors and Indicators 2.1 Front Panel 2.2 Rear Panel Installation Operation Bridge Mode Two Ohm or Not Two Ohm 5 6 7 9 11 13 15 16 7. Maintenance 17 8. 9. Warranty Specification 18 19 List of Illustrations Page Figure 1. Block Diagram Figure 2. Front Panel Layout Figure 3. Rear Panel Layout Figure 4. Case Dimensions Figure 5. "Speakon" Connector Wiring Figure 6.
Introduction 5 1. Introduction Congratulations on choosing Australian Monitor for your professional amplification requirements. The design of your KA-Series Audio Power Amplifiers embrace all the aspects of a well designed unit. The visual design, mechanical, electrical and sonic parameters, along with our dedicated manufacturing process, have all been optimized to provide a professional tool that exhibits quality, reliability and longevity. The KA-Series amplifiers are 2 unit (3.
Controls & Connectors 2.
Controls & Connectors 7 Front Panel The KA Series models have identical front panel layouts. Figure 1 shows the panel layout of the KA Series. The functions of the controls and indicators are as follows: This amber LED will flash when a fault condition exists. The fault detection circuit monitors the difference between drive and output in your amplifier.
Controls & Connectors Figure 3 Rear Panel Layout
Controls & Connectors 9 Rear Panel 6 Balanced Input A female 3-pin XL type connector is provided on each input: Pin 1 = Signal Ground; Pin 2 = Hot (non-inverting or in phase); Pin 3 = Cold (inverting or reverse phase). 6a Signal Strapping A male 3-pin XL type connector is provided and wired in parallel with the female input XLR for strapping / looping signal between amplifiers. 7 Signal Ground Lift Switch When this switch is engaged it disconnects signal ground from the input connectors on both channels.
Installation Figure 4 Dimensions
Installation 11 3. Installation Power Requirements Model: Mains Voltage 240, 220-230 KA800 Fuse Rating 8 Amps Power consumption at idle = 120 Watts. Power consumption at rated power = 1450 Watts. Model: Mains Voltage 240, 220-230 KA1200 Fuse Rating 10 Amps Power consumption at idle = 160 Watts. Power consumption at rated power = 2200 Watts. Ensure that your mains voltage is the same as the rear panel mains voltage marker (+/- 10%).
Installation Output Wiring When wiring to your speakers always use the largest gauge wire your connector will accept. The longer the speaker lead the greater the losses will be, resulting in reduced power and less damping at the load. We recommend using a heavy duty two core flex (four core flex if bi-amping) 10 to 12 gauge (2mm2 to 2.5mm2 or 50/0.25 or equivalent) as a minimum.
Operation 13 4. Operation IMPORTANT All signal source equipment should be adequately earthed. This not only ensures your safety but everybody else's as well. Faults can and do occur in mains connected equipment where the chassis can become “live” if it is not properly earthed. In these instances the fault in a “floating” (ungrounded) piece of equipment will look for the shortest path to ground which could possibly be your amplifier's input.
Operation Each channel of your KA800/KA1200 amplifier has a nominal balanced input impedance of 30kOhms (@1kHz) and should not present a difficult load for any signal source. Your signal source (i.e. the equipment feeding the amplifier) should have an output impedance of 600 Ohms or lower to avoid unwanted high frequency loss in the cabling. Input overload occurs at +20.5dBu (8.25 volts). See the specification section for more detailed information.
Bridge Mode 15 5. Bridge Mode The term BRIDGE is used when two independent amplifier channels are used to drive the same load. The load is in series (a bridge) between the two amplifier channels. Channel A is used as the "dominant" channel and its output is in phase with the input signal, and channel B has its phase reversed so it is exactly 1800 out of phase with the input signal. As two amplifiers with a phase difference of 1800 are now driving the load you will now have double the voltage into the load.
Two Ohm or Not Two Ohm 6. Two Ohm or Not Two Ohm NOTE: Ensure adequate ventilation and monitor the FAULT indicators to guard against thermal shutdown when driving two ohm loads. A Preamble. The load that a loudspeaker presents to an amplifier is very complex and at different frequencies can be inductive, capacitive, resistive, or a combination of these (reactive).
Maintenance 17 7. Maintenance Your KA800/KA1200 amplifier will need minimal maintenance. No internal adjustments need to be made to the unit to maintain optimum performance. To provide years of unhindered operation we suggest a maintenance inspection be carried out on a regular basis, say every 12 months or so. Fans Due to the openness of the air path through your KA800/KA1200 amplifier, very little dust should settle within the amplifier.
Warranty 8. Warranty Australian Monitor warrants the original purchaser of each KA-Series amplifier (purchased at an authorised Australian Monitor dealer) that it will be free from defects in materials and workmanship for a period of two (2) years from the original date of purchase.
Specification 19 Model: KA1200 Output Power E.I.A. 1 kHz, <0.1 % THD+N. Single channel driven. Both channels driven. 8ohm 440W 400W Pulsed @ 1 kHz, at onset of clipping, 10% duty cycle, re 4 ohms. Single channel driven. Both channels driven. Bridge mode 16 ohm load 8 ohm load E.I.A. 1 kHz, <0.1 % THD+N. Single channel driven. Both channels driven. 800W 750W Pulsed @ 1 kHz, at onset of clipping, 10% duty cycle, re 4 ohms. Single channel driven. Both channels driven.
www.australianmonitor.com.au Distributed by: Audio Telex Communications Pty Ltd ACN 001345482 www.audiotelex.com.au International Enquiries Ph: 612 9647 1411, Fax: 612 9748 2537, E-mail: ho@audiotelex.com.au Sydney Ph: (02) 9647 1411, Fax: (02) 9648 3698, E-mail: nsw@audiotelex.com.au Melbourne Ph: (03) 9890 7477, Fax: (03) 9890 7977, E-mail: vic@audiotelex.com.au Brisbane Ph: (07) 3852 1312, Fax: (07) 3252 1237, E-mail: qld@audiotelex.com.
