Polarity, Input Impedance | Turbosound LMS-D26, LMS-D6, LMS-D24

user manual

TA-890

Pin 1	Screen - connect to chassis of the unbalanced
	equipment, or left disconnected at the unbalanced end
Pin 2	signal hot
Pin 3	Signal cold

Polarity

In accordance with international standards, T series amplifiers are supplied with Pin 2 hot (+), so a positive (+V) input gives a positive (+V) output from the positive (+) output terminals.

Input Impedance

Each amplifier channel has an input impedance of 10kΩ, seen between pins 2 & 3 of the XLR.

When used with the LMS-D6 Loudspeaker Management System, distribution amplifiers are not required when a large number of T-25 or T-45 amplifier inputs are driven in parallel.

Gain and Sensitivity Settings

Gain settings are changed internally by simple jumper links. Two rows of pins marked - GAIN A and GAIN B - are situated on the input PCB (PCB701). A jumper link sets the gain and the settings are as follows:

Link 1 & 2	Gives 32dB gain
Link 3 & 4	Gives 26dB gain
Link 2 & 3	Gives approx 37.5dB gain

NOTE: Factory setting is normally link 1 & 2 = 32dB gain.

Setting higher gain does not change the maximum available power but changes the level of signal input to achieve maximum power. In any case, provided that the input signal is less than 20dBu/7.7V, the built in limiter circuit will prevent distortion within the amplifier.

TA-890 user manual

Page 83

Image 83

Turbosound LMS-D26, LMS-D6, LMS-D24 user manual Polarity, Input Impedance, Gain and Sensitivity Settings

Contents

Aspect TA-890 System TA-890 TA-890 TA-890 Amplifier Rack Signal Wiring Output Connections Products EC Declaration of Conformity Turbosound Polyhorn IntroductionTurbosound Aspect System Concepts TA-890 Aspect TA-890 Turnkey System Concept Amplifier Racks Power AmplifiersLoudspeaker Management System LMS Concept LMS-D24, LMS-D26 and LMS-D6 Loudspeaker Management Systems TA-890L Low Frequency Enclosure Digital ControllersAspect Loudspeaker Components TA-890H Mid-high Enclosure TSW-218 Subwoofer TA-890 Transportation Aspect Flying Systems Overview Flying and Stacking Gigmate Acoustic Simulation Setting up a Venue Overview Running Turbosound GigMate / Ease Focus for the first time System Setup Designing a system TA-890 TA-890 Changing the system Theatre-style venue 3-wide flown cluster @ 1kHz Safety Notes on Rigging Sample Certificate of Load Test Flying Hardware Wide and Narrow Flybar Settings Single A-System Flybar FB-890/1A TOP View Bottom View Figue 3. Triple ‘A’ System Flybar FB-890A/3W TS-890 Tilting Straps FC-890 Flying Chains TA-890 Four-wide hang using MB-890 and FB-890/2A ‘A’ System Flygear Integral Flying Hardware Swing Latch Connecting Flying Chains to the CabinetConnecting Cabinets ‘A’ System Drop Link Setting Vertical Angles ‘A’ System Attach buckle Attaching the Tilt Straps Aiming directivity of the stack Turbobass DirectivityBass Enclosure arraying TA-890 ABC DEF Typical Left to Right problem Bass in a line Creating Directional Bass arrays Fanned bass General observations of long lines of bass Bessel Array End firing array Summing up Ground stacking Introduction General features & facilities UnpackingMechanical Installation LMS Series Loudspeaker Management Systems LMS-D6 Front Panel Functions LMS-D6 Rear Panel Functions Mains Power Powering Up Voltage SettingSafety Earthing AC Power Fusing Audio Connections Input and Output Connector WiringTime correction for loudspeaker driver placement LMS-D24 and D26 Loudspeaker Management Systems Features Front Panel Functions TA-890 Rear Panel Functions Creating a Crossover Selecting a Factory PresetOperating the LMS-D24 and D26 Starting up Navigation and Viewing Parameters A Freq Width Gain EQ1 100Hz 1.4Q 0.0dB Navigation Out1 Freq Width Gain EQ1 100Hz 1.4Q 0.0dB Presets Preset Recall Preset Store Preset Name Store My System Stereo / Mono Formats Input DSP block diagramOutput DSP block diagram DSP Processing Layout Input Channels DSP Processing A Freq Shape HPF 20.0Hz LR24 Parametric filters Parametric EqualisationHigh and Low shelving filters Gain and Polarity DelayOutput Channels High and Low Pass Filters Out1 Freq Shape LPF 2.50k LR24 Out1 Freq Slope Gain EQ- 100Hz 12dB 0.0dB Routing Limiters Utility functions Utilities Audio Input Connectors Racking, Cables and Connections AMP-890 Aspect System Amplification Rack Input Connections Options Output Connections Amplifier Rack Signal Wiring Mid-High Outputs Break-out Cables NL4 bass Extension Cables Break-out cables NL8 mid-high Mains Connections General Features & Facilities T-45 High Efficiency Audio Power Amplifiers Front Panel Functions T-25 Front Panel Functions T-45 Mechanical Installation Audio Connections & Controls Voltage Range Input Impedance Gain and Sensitivity SettingsPolarity Damping Factor Attenuation & Gain Setting Cooling System Long Speaker Lines Maintenance To rotate the horn moulding from ‘A’ mode to ‘B’ mode Removal of the high frequency driver To rotate the horn moulding from ‘B’ mode to ‘A’ mode Removal of the high-mid frequency driver Removal of the low-mid frequency drive units General Maintenance Paintwork TA-890 Technical Specifications Serial Numbers Warranty TA-890