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

Page 83

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

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Contents Aspect TA-890 System TA-890 TA-890 TA-890 Amplifier Rack Signal Wiring Output Connections Products EC Declaration of ConformityTurbosound 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 SystemsTA-890L Low Frequency Enclosure Digital ControllersAspect Loudspeaker Components TA-890H Mid-high Enclosure TSW-218 SubwooferTA-890 Transportation Aspect Flying Systems Overview Flying and StackingGigmate Acoustic Simulation Setting up a Venue OverviewRunning 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 SettingsSingle 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 ChainsTA-890 Four-wide hang using MB-890 and FB-890/2A ‘A’ System Flygear Integral Flying HardwareSwing Latch Connecting Flying Chains to the CabinetConnecting Cabinets ‘A’ System Drop LinkSetting Vertical Angles ‘A’ System Attach buckle Attaching the Tilt StrapsAiming directivity of the stack Turbobass DirectivityBass Enclosure arraying TA-890 ABC DEF Typical Left to Right problemBass in a line Creating Directional Bass arraysFanned bass General observations of long lines of bass Bessel ArrayEnd firing array Summing up Ground stacking Introduction General features & facilities UnpackingMechanical Installation LMS Series Loudspeaker Management SystemsLMS-D6 Front Panel Functions LMS-D6 Rear Panel Functions Mains PowerPowering Up Voltage SettingSafety Earthing AC Power FusingAudio Connections Input and Output Connector WiringTime correction for loudspeaker driver placement LMS-D24 and D26 Loudspeaker Management Systems FeaturesFront Panel Functions TA-890 Rear Panel Functions Creating a Crossover Selecting a Factory PresetOperating the LMS-D24 and D26 Starting upNavigation and Viewing Parameters A Freq Width Gain EQ1 100Hz 1.4Q 0.0dBNavigation Out1 Freq Width Gain EQ1 100Hz 1.4Q 0.0dBPresets Preset RecallPreset Store Preset Name Store My SystemStereo / Mono Formats Input DSP block diagramOutput DSP block diagram DSP Processing LayoutInput Channels DSP ProcessingA 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 LR24Out1 Freq Slope Gain EQ- 100Hz 12dB 0.0dB Routing LimitersUtility functions UtilitiesAudio Input Connectors Racking, Cables and Connections AMP-890 Aspect System Amplification RackInput Connections OptionsOutput Connections Amplifier Rack Signal WiringMid-High Outputs Break-out Cables NL4 bass Extension Cables Break-out cables NL8 mid-highMains Connections General Features & Facilities T-45 High Efficiency Audio Power AmplifiersFront Panel Functions T-25 Front Panel Functions T-45 Mechanical Installation Audio Connections & Controls Voltage RangeInput Impedance Gain and Sensitivity SettingsPolarity Damping Factor Attenuation & Gain SettingCooling System Long Speaker LinesMaintenance 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’ modeRemoval of the high-mid frequency driver Removal of the low-mid frequency drive units General MaintenancePaintwork TA-890 Technical Specifications Serial Numbers WarrantyTA-890