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Summary of Contents for L-Acoustics LA 24
- Page 1 Version 2.2 September 1999 LA 24 OWNERS MANUAL...
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Page 2: Table Of Contents
Stereo operation Tandem mono • TROUBLESHOOTING Bridged mono • WARRANTY AND DISCLAIMERS Stereo reverse General • OPERATION International Operating precautions • TECHNICAL ASSISTANCE Powering up - Soft start International Input attenuators Factory service Gain L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08... -
Page 3: Introduction
INTRODUCTION Thank you for purchasing the L-ACOUSTICS LA 24 power amplifier. The amplifier you have chosen is the culmination of many years of research and development and makes amplification more controllable instead of the traditional "boring black box" that you have become accustomed to. -
Page 4: User Responsibility
Check whether the affected unit complies with the EMC limits for immunity (CE-labelled). If not, address the problem with the manufacturer or supplier. All electrical products sold in the EC must be approved for immunity against electromagnetic fields, high voltage flashes, and radio interference. L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08... -
Page 5: Front Panel
Two removeable grilles with foam filters are located on the front panel to prevent dust from entering the amplifier. 7. Power switch This is used to turn on/off the amplifier (see page 14). L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08... -
Page 6: Rear Panel
(see page 12). 7. Link switch Allows a single input to drive both channels simultaneously or used in conjunction with the Phase Reverse Switch to allow bridged operation (see page 12). 8. AC line cord L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08... -
Page 7: Installation
Cooling The LA 24 uses a forced air cooling system to maintain a low and even operating temperature. All L-ACOUSTICS amplifiers are fan ventilated and have front to rear cooling (generally there is usually cooler air outside the rack than inside). -
Page 8: Grounding
It also corresponds to a headroom of 9 dB, which is very low for audio program. For 2 ohm operation, the AFS-protection of the amplifier circuit will not permit long term current draw and the component temperature rise will stabilize well below the rating. L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08... -
Page 9: Input Connections
COLD (-ve) Figure 3. XLR input connector pinout There are also TRS jacks for linking etc. They are wired as follows: HOT (+ve) RING COLD (-ve) SLEEVE GROUND/SHIELD Figure 4. TRS phone plug L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08... - Page 10 The hum and noise rejection for the cable is equivalent to that for a balanced line. To minimize hum, always use balanced inputs whenever possible. Figure 8. Balanced line with unbalanced equipment L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08...
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Page 11: Connecting Speakers
Please refer to Table 2 to determine the power delivered into a specific load for various MLS switch settings. As you can see from Table 2 the LA 24 can produce in excess of 1000 watts into any impedance between 1.5 and 8 ohms. The fixed positions shown in Table 2 guarantee 1000... - Page 12 (even down to 0.3 ohms) but when time is of the essence, stick to the fixed positions. The thing to remember with the LA 24 that it is a power converter and when you select positions you are allocating a portion of the total power available.
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Page 13: Operating Modes
2 ohms). Driving bridged loads of less than 4 ohms may cause thermal overload. Figure 11. Bridged mono connection For bridged mono operation, both level attenuators must be in the same position. We recommend you leave them in the 0 dB (fully open) position. L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08... -
Page 14: Stereo Reverse
Alternatively, connect pin +2 on the channel A Speakon to the negative speaker terminal and pin –2 on Channel A to the positive speaker terminal. Figure 12. Stereo reverse mode Channel A output is connected as in the normal stereo mode. L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08... -
Page 15: Operation
Gain The LA 24 is configured for 32 dB gain as standard. Most professional mixing consoles operate at a nominal level of +4dBu therefore 32 dB gain gives you plenty of fader movement. INPUT SENSITIVITY... -
Page 16: Indicators
• When the clip limiter is not engaged the clip indicator lights for a longer period (clipping) The remaining yellow LEDs indicate if any protection circuits are activate. These are described below. Figure 13. Front indicators L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08... -
Page 17: Protection Features
• PROTECTION FEATURES Each L-ACOUSTICS amplifier has many advanced protection features that will protect both the amplifier and the speakers connected to it should a fault condition arise. All protection circuits are independent and under normal use these features are inaudible. When the amplifier comes out of a protect condition, the output level has a slow rise time - the effect is like turning the gain up slowly. -
Page 18: Short Circuit Protection
Short circuit protection All L-ACOUSTICS amplifiers are completely short circuit protected. The protection circuit permits very high peak currents, but still holds the output devices within their safe operation area. If a short circuit is maintained, the channel affected will eventually go into thermal protection and the cycle will repeat. -
Page 19: Design Features
Light weight The LA 24 has an excellent power to weight ratio, (280 W/Kg) making it one of the most powerful 2U amplifiers available. The light weight is achieved not only through use of the switch mode power supply - the Intercooler and 9 piece anodized alloy chassis also contribute greatly, making rear rack supports unnecessary in many applications. -
Page 20: Mls™-Switches
LA 24 will produce the same power output even if the AC line voltage falls by up to 20% ! Efficiency is also assured, and in the case of the LA 24 this is especially apparent - its power supply draws only 4 kW while producing 2 x 1400 W. For a conventional amplifier, typically only 2 x 650 W would be produced and nearly 3 kW wasted as heat. -
Page 21: Safety Approvals
• SAFETY APPROVALS L-ACOUSTICS amplifiers are designed to meet IEC65, a stringent electrical safety approval from the International Electro-technical Commission. The IEC65 standard is recognized world-wide with most countries having an equivalent. EMC approvals EMC stands for Electro Magnetic Compatibility. This implies that the equipment should have low emission of radio frequencies, directly radiated as electromagnetic fields in the air and as conducted from the cables connected to the unit. -
Page 22: Mains Voltage Selection
• APPENDIX A Mains voltage selection The LA 24 is normally shipped for 230 volt AC operation but can be configured for 115 volt AC option. To check if the amplifier is equipped with the 115/230 V option, please follow these steps: 1. -
Page 23: Maintenance
• MAINTENANCE Under normal use the LA 24 amplifier should give years of trouble free service. The only user maintenance required is to remove and vacuum the front grill periodically. In some extreme cases it may be necessary to clean the inside of the amplifier. This is usually necessary after prolonged use in environments where "cracked-oil"... -
Page 24: Warranty And Disclaimers
No other warranty is expressed or implied. This warranty shall be null and void, if the product is subjected to: 1) Repair work or alteration by persons other than those authorised by L-ACOUSTICS or its agents. 2) Shipping accidents, war, civil insurrection, misuse, abuse, operation with incorrect AC voltage, operation with faulty associated equipment and normal wear and tear. -
Page 25: Technical Assistance
• TECHNICAL ASSISTANCE International If your L-ACOUSTICS product needs repair then contact your L-ACOUSTICS dealer or distributor directly (or contact L-ACOUSTICS by fax to obtain the location of the nearest authorised service centre). Factory service In the event that your L-ACOUSTICS product needs factory service, you should contact the L-ACOUSTICS service department for return instructions and a Return Authorisation number.
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