User manual GAMUT M250 2004

[. . . ] GamuT GamuT International A/S, Oesterled 28, Bygning A, DK-4300 Holbaek, Denmark Telephone no: int + 45 70 20 22 68 Telefax no: int + 45 59 43 97 26 www. gamutaudio. com Users Guide GamuT M250 Mono Power Amplifier GamuT International A/S, Oesterled 28, Bygning A, DK-4300 Holbaek, Denmark Telephone no: int + 45 70 20 22 68 Telefax no: int + 45 59 43 97 26 www. gamutaudio. com Users Guide GamuT M250 Mono Power Amplifier SAFETY INSTRUCTIONS: - Never let children (or grownups) push anything into holes or slots in the case - this could result in an electric shock and could cause damage of the set. - Never guess or take chances with electrical equipment of any kind - it is better to be safe than sorry. Warning: To prevent fire or shock hazard do not expose this appliance to rain or moisture Warning: No user serviceable parts inside. Refer servicing to a qualified technician. [. . . ] DO NOT USE BOTH CHANNELS TO DRIVE ONE LOUDSPEAKER!Loudspeaker impedance Most loudspeaker are 8 or 4 Ohm, and they are specified so by the manufacturer. Unfortunately, some loudspeakers have an impedance, which is much lower than specified. They will not damage the GamuT power amplifier, because it will simply mute. In the GamuT M250 MkIII, we use a gem of a MOSFET transistor. It handles 500W, and a peak current of 400 Ampere and 100 Ampere long-term. Such high currents will destroy any HiFi loudspeaker we know of. The lower the impedance, the higher the current will be. Somewhere, we have to draw a line between what is a loudspeaker load, and what is a short circuit. We have set this line at 1. 5 Ohm, which will draw about 47 Ampere peak. The impedance of a few electrostatic loudspeakers does go down below 1. 5 Ohm at high frequencies. The protection circuit will not allow this long-term on test signals. However, it works well with Quad ELS63 and most Martin Logan electrostatic loudspeakers. Please also note that a Quad ELS-63 electrostatic loudspeaker cannot handle more than 55V peak, and the GamuT M200 MkIII can give more than 70V peak. A lifetime of enjoyment So far, our oldest amplifiers from 1982 still work in professional recording studios, often doing their job 16 or 24 hours a day. So we expect our GamuT amplifiers to do likewise. A more likely cause for change would be your wish to upgrade in some years time. Here our modular approach serves to keep the upgrade cost low, and you avoid selling with a loss on the second hand market. The cabinet should last a lifetime, and the GamuT Logo is engraved down into the surface; wearing the text out will be quite difficult. Apart from being good economy, this long term approach is also better for the environment. Most parts of the cabinet are made of aluminium, which is easy to recycle. All parts are screwed together to enable easy disassembly. [. . . ] Compare the two types of piano sound, this and dmp. A good stereo system must highlight the differences between different recordings and play both of them well. Vertigo 800 051-2, Dire Straits, "Dire Straits". Track 4, "six-blade knife", is actually better than several of the later recordings. [. . . ]