User manual AUDIO ANALOGUE MAESTRO MONO BLOCK POWER AMPLIFIER REV 1.2A

[. . . ] Not respecting the instructions contained in this manual will invalidate the terms and conditions of the guarantee. NECESSARY PRECAUTIONS FOR SAFETY AND MAINTENANCE ATTENTION: before starting any operation, use or maintenance of the equipment it is strictly necessary to understand the following manual. To avoid any accidents or hazards it is necessary to follow the following regulations. Activate the equipment only prior checking if the installation has been properly made, and if it is related to the instructions contained in this manual. [. . . ] If liquid is spilled in the unit, immediately unplug it from the wall outlet avoiding touching the unit metallic parts and contact your local dealer for checking before operating the unit. Keep the unit away from heat sources such as direct sunlight, stoves, radiators and the like. If the amplifier is brought directly from a cold to a warm place, moisture may condense inside the unit causing malfunctioning. In this cause, please wait for at least an hour before operating the unit. INTRODUCTION The amplifier Maestro Monoblock has been perfectly realised in every single detail in order to improve the sound performance. Many hours spent to design and simulate the new circuit's configuration, have been followed by a lot of listening tests. The target was to obtain an amplifier with balanced inputs suitable to every kind of speaker maintaining the same refinement of the amplifiers with low output power. The study of the circuit's configuration and the design of the mechanical parts have had a parallel development in order to guarantee a perfect cooling even having the heatsinks completely covered by the chassis. The basic structure of the amplifier MAESTRO MONOBLOCK is the same used in the precision balanced amplifier used in the laboratories. The first two must amplify in tension the balanced signal and the third one must supply the necessary current amplification to drive the speakers. This kind of structure has two important benefits: the first one is a disturbs high immunity, while the second one is the possibility to improve each amplification stage. The separation between the gain in tension and of the gain in current permits to realize class A tension amplifiers made with low power components, so to obtain a frequency response up to about 500kHz. Such frequency extension gives the possibility to maintain the phase errors to a very low level. The power section has been designed to obtain a high gain in current and not in tension. Thanks to this solution, it is possible to keep the frequency response at full power around at 200kHz. Also the bass frequency extension has been realised with care applying an offset recover circuit able to go down to 3Hz. Due to its two stages configuration, the amplifier Maestro Monoblock does not have a global feedback between inputs and outputs This power goes up to 800W@2ohms. The protections starts to work at around 1000W with a load of 1ohm(if your house system can support it!) To obtain this kind of power levels the supply section has been over dimensioned. In fact, have been used two toroidal transformers for a total of 1406W. Each power branch is rectified from a diode's bridge, with 50A components and the filter section contains 8 electrolytic 15000µF capacitors for a total of 120000 µF. Furthermore, also the supply of the low power section has been realized one bridge for each branch and filtrated with two 15000µF capacitors. [. . . ] If your used electrical or elctronic equipment has batteries or accumulator, please dispose of these separately before and according to local requirements. By disposing of this product correctly you will help ensure that the waste undergoes the necessary treatment, recovery and recycling and thus prevent potential negative effects on the environment and human health which could otherwise arise due to inappropriate waste handling. In other countries outside the EU If you wish to discard this product, please contact your local authorities and ask for the correct method of disposal. For Switzerland: Used electrical or electronic equipment can be returned free of charge to the dealer, even if you don't purchase a new product. [. . . ]