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Hi this amplifier is used but in good condition generally. I’ve found a description online. Putting on at 50p start so grab yourself a bargain.This multichannel power amplifier has been designed using the same technology as the PAM amplification series. With this technology, ECLER introduced a new concept to the world of professional audio: The use of switching field effect transistors. The SPM-Technology (Switching Power Mosfet) has been developed and patented by ECLER S.A. The use of these parts for audio applications represents a firm and spectacular enhancement comparing to conventional amplifiers. These advantages can be outlined as follows: Lower internal resistance than bipolar transistors, which leads to less heating of the amplifier and more powerful and controllable bass. Conventional Mosfets have a 4 to 7 times bigger internal resistance than switching Mosfets. The extremely high speed of these devices gives a transparency to the upper frequencies till now only achieved by tube amplifiers. This fact also reduces TIM (transitory intermodulation) to very low levels. The MPA4-150 amplifier station consists of four 147W/4Ω amplifiers which can be configured through a set of switches found on the rear panel. This allows multiple amplification setups useful in many situations, for example: Four mono amplifiers for four different mono inputs When setup this way, the MPA4-150 is able to amplify four different audio signals, each one having a dedicated volume control. Four mono amplifiers for one common mono input The amplifier operates now with just one input signal for all amplifiers, but preserves the ability to control each channels volume independently. This setup is useful when distributing signals to different zones. Four mono amplifiers for one common stereo input This setup is similar to the previous example but the input is now a stereo signal. The amplifier adds both stereo channels together converting them into a mono signal. Two stereo amplifiers for two different stereo inputs Each stereo channel offers a dedicated volume control. Useful for addressing two zones with two different stereo signals. Two stereo amplifiers for one common stereo input This setup is similar to the previous example but the input is now a single stereo signal which is fed to both amplifiers. Two bridged amplifiers for two different mono inputs Now you get a typical stereo amplifier configuration. With a bridged amplifier you obtain doubled output power with a load of at least 8Ω. Two bridged amplifiers for a common mono input The MPA operates now with a single mono signal for two mono amplifiers, each one with its own volume control Two bridged amplifiers for two different stereo inputs You can obtain two zones with independent volume control and two different stereo signals, but these stereo signals are internally converted to mono in each bridged amplifier Two bridged amplifiers for a common stereo input This setup is similar to the previous example but the input is now a stereo signal. The amplifier adds both stereo channels together converting them into a mono signal. One stereo amplifier and one bridged amplifier for a common stereo input. Useful for setups where a stereo amplifier drives the mid-range and high frequency speakers while a second, bridged amplifier drives a subwoofer. This multichannel amplifier features a low-pass filter to operate on a subwoofer system and a high-pass filter for the mid-range speakers and tweeters.
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