Q-Tech Q-Tech Commercial Series QTA 2120P/2240P 2-Channel Power Amplifiers User Manual
WARNING THIS APPLIANCE MUST BE EARTHED General Installation DO NOT run unbalanced high impedance microphone cables near mains, data, telephone or 70/100V line cables. DO NOT run 70/100V line cable near data, telephone or other low voltage cables. DO NOT exceed 90% of the amplifiers output power when using 70/100V line (speech only). DO NOT exceed 70% of the amplifiers output power when using 70/100V line (high level background music).
QTA 2120P/2240P User Manual Contents Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Front Panel Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Rear Panel Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Power Source . . . . . . . . . . . . . . . . . .
QTA 2120P/2240P User Manual Introduction Description Congratulations on your purchase of a new Q-Tech Commercial series amplifier. Quest Engineering Q-Tech Series amplifiers are engineered and built to a standard that will satisfy the most demanding environments of commercial installation audio. The QTA 2120P and QTA 2240P are 2 channel power amplifiers designed for 2 zone applications.
QTA 2120P/2240P User Manual Front Panel Layout 2 1 4 3 5 6 1 Power On/Off Switch 4 Signal Indicators 2 Power On Indicator LED 5 Peak Indicators 3 Channel Volume Controls 6 Protection Indicators Rear Panel Layout 5 1 1 AC Power Input Socket 3 6 2 7 9 10 8 3 11 4 7 Channel 2 Phone Jack Input 2 Earth Terminal 8 Channel 2 XLR Input 3 Channel 2 Speaker Terminal 9 Channel 1 Link Output 4 Channel 1 Speaker Terminal 10 Channel 1 Phone Jack Input 5 24v DC Power Input 11
QTA 2120P/2240P User Manual Power Source AC Power Source The supply transformer has been designed for use AC 240V(±10%) 50 Hz. DC Power Source Battery Connection (24Vdc) When using external batteries, please ensure the amplifier is grounded via the screw terminal. (Electrical stability of the system will be improved by providing a good earth ground.) When connecting batteries, please ensure correct polarity. Main Connections Each input has XLR and Phone jack input.
QTA 2120P/2240P User Manual Common problems with ceiling speaker installations Trouble Shooting System is distorting. Check for the following causes: If the amplifier fails to work as required, please check the following: 1. Too many speakers set to too high a power tapping for the power of the amplifier Solution: Calculate the total power draw and re connect the speakers to a lower the wattage tapping. (See below) Some cheap ceiling speakers have incorrect taping labels.
QTA 2120P/2240P User Manual Specifications Constant Voltage Distributed Speaker Systems Demystified Type Booster Amplifier Model QTA 2120P QTA 2240P Output Power (RMS): 120W x 2 240W x 2 Power Supply 6 Technical Notes Mains Voltage AC 115V or 230V 50/60Hz Battery Voltage DC 24V Total Harmonic Distortion <= 1% @ 1KHz, rated power Sensitivity XLR, Phone Jack (balanced) 1v @ 10K ohm Outputs 8Ω, 70V, 100V Signal to Noise Ratio4 86 dB Indicator Power On, Level AC Power Consumption 44
QTA 2120P/2240P User Manual A low impedance terminal will be for 8-ohm speaker installations and is under no circumstances to be connected to a transformer type speaker system. How to calculate the correct number of speakers and what wattage connection for a given amplifier power. If you connect too many speakers to an amplifier you will have distortion, overheating of the amplifier and generally poor performance.
QTA 2120P/2240P User Manual High impedance of speakers and output calculation table for 100Volt systems Output Impedance Output Impedance Output 0.1W 100KΩ 10W 1KΩ 40W Impedance 250Ω 0.5W 20KΩ 15W 667Ω 50W 200Ω 1W 10KΩ 20W 500Ω 75W 133Ω 2W 5KΩ 25W 400Ω 100W 100Ω 3W 3.33KΩ 30W 333Ω 150W 66.
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