We are no longer offering this product. You will surely find a current product that meets your needs, because we are striving to expand our extensive product range. Efficient cooling system "Back to Front" cooling system takes fresh air from the rear and throws it out at the front panel. Thermal management system.
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Manual zz. Precautions 04 04 2. Placement, mounting, cooling 3. Mains connection 3. Input signal connections 3. Output connections 3. Subsonic filter 4. Starting up 4. Input attenuators 4. Active filters 05 06 06 07 07 07 08 08 08 08 09 09 09 09 09 09 10 10 6. Figures 7. Function list 7. Function diagram 8. We recommend our authorised Technical services if any maintenance task should be needed so that optimum operation shall be achieved.
Precautions The amplifiers, specially the high power models, have a high power consumption and so, special care must be taken when sizing the mains wiring. We recommend a 2. The environment must be dry and dustless.
Do not expose the unit to rain or water splashes, and do not place liquid containers or incandescent objects like candles on top of the unit. Do not obstruct the ventilation shafts with any kind of material. Never connect the loudspeakers while the amplifier is on! Remember that voltages as high as Vpp and up to A currents can be present at these outputs. The output cabling should be connected by a qualified technician.
Otherwise only use pre-made flexible cables. There are no user or serviceable parts inside the amplifier. These components were only used in switching applications until today and their use in the audio field means a firm and spectacular progress in relation to conventional systems.
This advantages can be summarised as follows: a The internal resistance is lower for the switching mosfets than for the bipolar transistors, meaning that the amplifier will operate colder and with strong and well controlled bass.
The conventional audio mosfets have an internal resistance 4 to 7 times greater than the switching mosfets. Effective protection systems that do not affect audio quality with anticlip system and status indicators.
Auto reset system. Soft start feature. The models and feature A2SP Analogue Autogain Signal Processor , an VCA-controlled autogain protection system and intelligent variable threshold anticlip protection that adapts to the incoming type of transitory.
Switchable subsonic filter. The models and feature a dual power supply. Thermal management system. Temperature controlled progressive cooling. Road-proof, robust chassis.
Lockable gain controls. A path for cool air to the inlet of the forced air tunnel must be provided. The air inlet is on the back of the amplifier and gets out on the front panel thus avoiding an excessive heat accumulation when mounted in a rack and extending the electrolytic capacitors life.
It is also convenient to place the amplifiers on top of other equipment and not under it when mounted in a rack. In all models, the cooling air flow increases as a function of the amplifier internal temperature thanks to the progressive cooling system. Four plastic washers are supplied to protect the fixing profile when the amplifier is mounted in a rack. It is also advisable to use fixing guides on the sides of the rack for a better security of the amplifier, specially when transport can be frequent.
The models and include a handle set to ease the transport and mounting. See figure 1 5 3. This system enables the simultaneous connection of various amplifiers without overloading the magneto-thermal switches and also increases the electronics reliability thanks to the suppression of the initial transitories. The PAM do not need this system because of their lower power. Make sure that the mains wire is not engaged with the signal wires in order to avoid possible hum. A set of slow blow fuses on each power module, on the transformer primary and on the soft start circuitry see table is disposed in the amplifier as a protection against overloads.
Whenever one of this fuses blows, it must be replaced by another one of the same characteristics. If it blows again, please consult our Technical Service.
This switch makes possible to disconnect the electrical ground from the mechanical ground. Whenever hum arises, alternatively switch the earth link switches of the amplifier and others components of the audio chain. Input signal connections The signal input connectors are of XLR-3 type 16 , electronically balanced.
The pin assignment is as follows: 1. This impedance makes possible to parallel several amplifiers without loosing audio quality.
The input circuit has an electronic protection against overloads of 80Vpp permanent and Vpp short moments. There is an RLC radiofrequency filter that avoids possible intermodulations and also protects the treble loudspeakers. The rising time of the input signal has been optimized for a very low TIM. The correspondent Led on the front panel will shine. The phase shifter used for BRIDGED mode is electronic and is placed in the input circuit, thus lessening the distortion and increasing the phase margin.
When operating on BRIDGED mode, the signal input is made through channel I input and the corresponding input attenuator is operative while the one of the other channel is not. The cable between the amplifier outputs and the loudspeakers must be of good quality, enough section and as short as possible.
We recommend a section of 2. Subsonic filter This filter cuts off inaudible frequency components which when amplified suppose a risk of damage to the low frequency speakers as they generate excessive excursions of the woofer's diaphragm. The amplifiers are delivered with a cut-off frequency of 20 Hz. To select a different cut-off frequency, refer to figure 3. During this period, the A2SP Analogue Autogain Signal Processor progressively in about ms raises the amplifiers input gain models and It is very important to start the audio chain in the following order: sound signals, mixer, equalizers or active filters and, finally, power amplifiers.
To stop the chain follow the inverse order. The amplifier is supplied with two transparent plastic caps that let you lock the Input gain controls. Once inserted they can only be removed with a sharp object. As opposed to conventional compression or limiting techniques, the side-effects are not noticeable and most important, neither dynamic range is reduced nor THD is increased.
Furthermore, these models include a thermal sensor inside the transformer that also contributes in controlling the A2SP in case of reaching a critical temperature that could be dangerous to any of the two power transformers.
See figure 4. The convenience of such a circuit in any kind of installation has to be remarked: The clear advantage of a limiting system in front of conventional compressors is that the former does practically not alter the dynamic range, acting only when the distortion threshold is reached. They shine when the input level is greater than dBV.
The protections also become active when there exists an excessive high frequency clipping, thus protecting the tweeters 2- If the amplifier is supplying DC signal or very low frequencies that could damage the loudspeaker.
The protections detect frequencies under 4Hz. If the indicators are permanently lit, this is a symptom of malfunction and the cause should be investigated. The Autoreset system will cyclically restart the amplifier after about seconds.
If the problem still persists, please consult our Technical Services. This system takes into account the possible changes of the mains supply and always gives a true measure independently of the mains voltage. It is usual that the CLIP indicators shine following the bass frequencies when the amplifier operates at high power levels.
Take care that the CLIP indicators are not permanently lit. The only limitation is the thermal protection and the A2SP system in the CHANNEL N models, which would only get active after a long period of operation at high power or a saturation of the cooling system. This would cause an automatic and progressive reduction of the input gain without affecting musical dynamics nor limiting transient signal peaks.
The FA2LP low-pass filter can be configured for 4 different cut-off frequencies: , , and Hz. Refer to the enclosed module manual when installing the filter. To clean it, use a soft cloth slightly wet with water and neutral liquid soap; dry it with a clean cloth. Be careful that water never gets into the amplifier through the holes of the front panel. Precauciones 12 12 2. Input attenuator 2. Clip indicator, CLIP 3. Illuminated mains switch 8.
Fan 9. Speak-on connectors to the loudspeakers Fuse holder Mains cable Earth terminal, GND
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