Long Speaker Lines, Cooling System | Turbosound LMS-D24, LMS-D6

user manual

TA-890

Long Speaker Lines

Whenever loudspeakers are connected to power amplifiers by long cables (above 20'/6m), there is invariably an increased risk of high frequency instability. It is aggravated by the combination of RF pickup in unshielded cables acting as aerials, and multiple complex reactances in the cable and loudspeakers.

High frequency instability can be avoided by adopting these common sense rules:

•Ensure the input wires are shielded and that the shield is connected to the amplifier's input XLR pin 1.

•Do not run output cables next to input signal lines. Keep apart, and preferably cross at right angles. If cables have to follow a similar route or path, keep them separated by at least 2 feet (0.6m).

The Cooling System

The cooling fans respond to temperature sensors within the unit to maintain a safe operating temperature. In the event of excessive temperature, the protection circuit will operate, disabling the output. The red ‘AUDIO-PROTECT’ (A/P) LED will indicate this condition. (See fault indicator.)

There are 4 fans connected permanently with variable speed and a jumper link to enable them from cold.

Normal dynamic signals will not cause the amplifier to overheat unless the ventilation is inadequate. (See installation section and maintenance section.)

TA-890 user manual Page 85

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Turbosound LMS-D24, LMS-D6, LMS-D26 user manual Long Speaker Lines, Cooling System

Contents

Aspect TA-890 System TA-890 TA-890 TA-890 Amplifier Rack Signal Wiring Output Connections Products EC Declaration of Conformity Turbosound Aspect System Concepts IntroductionTurbosound Polyhorn TA-890 Aspect TA-890 Turnkey System Concept Loudspeaker Management System LMS Concept Power AmplifiersLMS-D24, LMS-D26 and LMS-D6 Loudspeaker Management Systems Amplifier Racks Aspect Loudspeaker Components Digital ControllersTA-890L Low Frequency Enclosure 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 Connecting Cabinets ‘A’ System Connecting Flying Chains to the CabinetDrop Link Swing Latch Setting Vertical Angles ‘A’ System Attach buckle Attaching the Tilt Straps Bass Enclosure arraying Turbobass DirectivityAiming directivity of the stack 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 Mechanical Installation General features & facilities UnpackingLMS Series Loudspeaker Management Systems Introduction LMS-D6 Front Panel Functions LMS-D6 Rear Panel Functions Mains Power Safety Earthing Voltage SettingAC Power Fusing Powering Up Time correction for loudspeaker driver placement Input and Output Connector WiringAudio Connections LMS-D24 and D26 Loudspeaker Management Systems Features Front Panel Functions TA-890 Rear Panel Functions Operating the LMS-D24 and D26 Selecting a Factory PresetStarting up Creating a Crossover 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 Output DSP block diagram Input DSP block diagramDSP Processing Layout Stereo / Mono Formats Input Channels DSP Processing A Freq Shape HPF 20.0Hz LR24 High and Low shelving filters Parametric EqualisationParametric filters Output Channels DelayGain and Polarity 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 Polarity Gain and Sensitivity SettingsInput Impedance 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