info you need to know the Rules of manual Agreement dell

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One of the difficulties that I have perceived among guitarists, connections between cupboard heads and chests, concerns the selection of the impedance, very important for the maximum yield of the final and his health. Especially using the valve, the need to connect a cabinet impedance equal to that of the power amplifier is of fundamental importance cupboard not to run the risk of melting of the valves and of the output transformer, very expensive to replace.
The lack of knowledge cupboard on this subject is most guitarists to experiment with the effect of a precipitous cargo wrong or even absent, leading to serious consequences such before.
If desired, one could connect a crate with an impedance greater than that of the final optimum, reducing the power output as is the case also in the solid-state amplifiers, where it is not present the output transformer. Even in this manner, however, it still runs some risk of failure, because the voltages on the valves have major variations, which can overcome various limitations. Absolutely you should never connect a smaller load impedance of the final, regardless cupboard of the technology used, because the increased output current would certainly lead to its rupture.
If you need to have different efficiency, including use in the home dedicated to the study of a song, the rehearsals cupboard with the group and the evenings or live, you might opt for two or more solutions.
The first is to have a case to a single cone to keep at home even with low efficiency or partially closed, to muffle the sound volume in saturated fat, but could also be suitable for those preamp or a pedal, building a homemade attenuator, of acoustic type, inserted on the grid and the possible opening of the cone back, or usandone between an electric amp and cone, with the aim precisely to reduce the sound pressure cupboard generated.
These solutions may also be adopted using a combo and, inter alia, the use of a single speaker, using low power, improves the definition of the notes. In the rehearsal room or on stage, due to the greater sound pressure required, you might have used a crate with two or even four cones, which must still have the same impedance of work.
To be sure of the impedance of a speaker cabinet, should be measured with a multimeter at the minimum flow rate, typically 200 ohms, at the entrance itself. This is because cupboard the cones may have been replaced by a previous owner with others of different impedance, or their internal connection may have been changed, or maybe we are just a box with directions and mono / stereo selector cupboard that can be confusing. Remember that, in the case of purchase of used, it is possible to a value different cupboard from the value indicated.
The use of the tester sometimes is not the most easy, also because there never will measure the nominal value, which is a standard cupboard value of the cabinet, but its dc resistance, cupboard normally less than what is indicated. Furthermore, the difficulty of a good electrical contact, added to some oscillation measurement cupboard meters, can confuse us.
From the indications of two well-known brands, such as Jensen and Celestion, we constantly values ranging from 2.7 to 3.9 ohms for the four cones, from 4.9 to 7.5 for those eight, from 11.8 to 14.8 for those sixteen. As you can see, the differences are significant and measuring a value of 4.9 ohm was led to believe that it is a cone of four ohms, instead of eight, the same thing could be done by measuring 11.8 ohms closer in theory to speakers eight, which those sixteen.
The measurement takes place via a multiple cupboard comparison, using three Quad Operational working in digital mode, while viewing via five LEDs, two red, one to indicate a short circuit condition and another cupboard for that of open circuit - or anyway values cupboard from 18 ohms up - three green, yellow, or whatever you prefer to indicate the four, eight and sixteen ohms impedance. The circuit is powered by nine volt battery, which can be used with a certain precision cupboard and brightness of the LED even if drops to six volts.
By analyzing the circuit diagram, we have a jack in