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Summary of Contents for L-Acoustics LA24a
- Page 1 Version 1.0 January 2003 LA24a OWNERS MANUAL...
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Page 3: Table Of Contents
7.4 Input Attenuators ........................18 7.5 Indicators ............................. 18 8. PROTECTION FEATURES....................... 19 8.1 Clip Limiter..........................19 8.2 Thermal Protection ........................19 8.3 VHF Protection..........................19 8.4 Short Circuit Protection ......................19 8.5 AC Mains Voltage Protection ...................... 20 L-ACOUSTICS LA24a Manual V1.0 27/01/2003... -
Page 4: List Of Figures
Table 4: LA24a Maximum Output Power versus Mains Input Power ..........12 Table 5: LA24a Output Power and Input Sensitivity versus MLS Switch Setting (32 dB gain)....13 Table 6: Maximum Recommended Length for Damping Factor > 20 ..........16 L-ACOUSTICS LA24a Manual V1.0... -
Page 5: Approvals
The third prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. 9. Connect only to AC power outlets rated 230-240 V, 50-60 Hz. L-ACOUSTICS LA24a Manual V1.0 27/01/2003... -
Page 6: User Responsibility
However, there is no guarantee that interference will not occur in a particular installation. L-ACOUSTICS LA24a Manual V1.0 27/01/2003... - Page 7 All electrical products sold in the EC must be approved for immunity against electromagnetic fields, high voltage flashes, and radio interference. • Consult the dealer or an experienced radio/TV technician for further assistance. L-ACOUSTICS LA24a Manual V1.0 27/01/2003...
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Page 8: Introduction
3. INTRODUCTION Thank you for purchasing the L-ACOUSTICS LA24a power amplifier. This manual contains important information on operating your power amplifier correctly and safely. Please take time to read this manual in order to familiarize yourself with the many advanced features of this amplifier. -
Page 9: Rear Panel
7. Power Switch Turns the mains power on or off. 3.3 REAR PANEL Gain=32dB Figure 2: LA24a Rear Panel 1. Output Speaker Connector The Neutrik® Speakon connector may be unfamiliar to some users. A full description is found in Section 6.2. -
Page 10: Rear Panel Features
MLS positions when connected to lower speaker impedances and as can be seen in Table 1, the LA24a can produce output power in excess of 1500 watts. Essentially, the LA24a amplifier is a power converter and by selecting MLS positions you are allocating a portion of the available 3400 watts power. -
Page 11: Mls Technology Background
MLS positions can be different for each channel and a variety of combinations can be selected as seen in Table 2. There is no risk for amplifier damage since the LA24a is very well protected (even down to 0.3 ohms). However, if uncertain or where time does not allow, use the default position (MLS = 0 dB). -
Page 12: Installation
5. INSTALLATION 5.1 MOUNTING The LA24a is two rack units high (2U) and will mount in an EIA-standard 19'' rack. Four mount points are provided on the front panel of the amplifier for rack mounting. For permanent installation, the amplifier can be mounted using standard 19'' rack mount rails and/or slides within the amplifier rack using the four front mount points. -
Page 13: Operating Voltage
National deviation concerning installation of the LA24a: Danish safety regulations stipulate the use of an 8 A mains fuse. Since the LA24a uses an internal primary mains fuse of 15A, the LA24a must be equipped with an industrial mains connector rated for 16 A or, alternatively, be installed to a fixed 16A circuit. -
Page 14: Power Consumption
9 dB of headroom (which is very low for normal audio program). Table 4: LA24a Maximum Output Power versus Mains Input Power MAXIMUM OUTPUT POWER MAINS INPUT POWER... -
Page 15: Heat Power Calculation
Since the output power delivered varies with the load impedance, 4 ohms is generally taken as the reference. For the LA24a, full output power into 4 ohms is 1500 W (MLS switch = 0 dB) and standard gain is 32 dB. This corresponds to an input sensitivity of 1.95 Vrms or 8.0 dBu. -
Page 16: Connections
To daisy chain amplifiers, use the XLR-male connector, labeled Link, provided on each channel. This connector is wired in parallel with the Neutrik® Combo jack on each input. Gain=32dB Figure 7: LA24a Rear Panel Detail L-ACOUSTICS LA24a Manual V1.0 27/01/2003... -
Page 17: Unbalanced Inputs
Speaker connections are made via the two Neutrik® NL4FC Speakon connectors. The Speakon connector is designed for high power speaker connections and assures correct polarity, locks securely in place and prevents from shock hazard. The LA24a power amplifier Speakon connectors are wired in the following manner: Channel A Channel B... -
Page 18: Operation
Note: Formerly, this was referred to as reverse stereo operation for the LA24. For this reason, be sure to use balanced inputs on all measurement equipment (also oscilloscope probes) if you are bench testing. Figure 11: Reverse polarity operation for Channel B L-ACOUSTICS LA24a Manual V1.0 27/01/2003... -
Page 19: Tandem Mode
4 ohm part of the load and the other channel shares the other 4 ohm part. The power into 4 ohms from an LA24a (MLS at 0 dB) is 1500 W. Therefore, the total bridged power into the 8 ohm load will be 2 x 1500 = 3000 W. -
Page 20: Powering Up - Soft Start
In bridged mode, both controls must be in the same position so that the speaker load will be shared equally between the channels. 7.5 INDICATORS Figure 13: LA24a Front Panel Detail The two bottom green ”ON” LED’s indicate that the output circuits are receiving the correct rail voltage. -
Page 21: Protection Features
Under normal operation, clip limiting is inaudible. The limiter can be turned On or Off by depressing or pressing the relevant rear panel clip limit switch. L-ACOUSTICS recommends leaving the clip limiters switched ON at all times (Channel A, B rear panel clip limiter buttons depressed in the “IN” position). -
Page 22: Ac Mains Voltage Protection
In the unlikely event of a non-user rectifiable fault, return the amplifier to your supplier or an approved service centre (see Section 11). L-ACOUSTICS cannot be held responsible for damage or injury as a result of the top or bottom covers being removed. -
Page 23: Warranty
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, exposure to inclement weather conditions and normal wear and tear.
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