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Anleitung Zusammenfassung
Should this case arise, consult your YAMAHA dealer. _CLEANING_ Wipe off dust with a dry soft cloth. To remove dirt or fingermarks, use a soft damp cloth then dry immediately with a clean cloth. Do not use alcohol, thinners or other chemical solvents since they may damage the finish or remove the panel lettering. Do not use any aerosol sprays near this unit as these products can easily get into the unit and damage the circuitry. LOCATION VENTILATION Special instructions for the U.K. THE WIRES IN THE MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE: Blue: NEUTRAL Brown: LIVE As the colours of the wires in the mains lead of this apparatus may not corresponc with the coloured markings identifying th€ terminals in your plug, proceed as follows The wire which is coloured BLUE must be connected to the terminal which is markec with the letter N or coloured BLACK. The wire which is coloured BROWN must be connected to the terminal which is markec with the letter L or coloured RED. FRONT PANEL ILLUSTRATION ABBILDUNG DER VORDERSEITE ILLUSTRAZIONE DEL PANNELLO ANTERIORE ILLUSTRATION DU PANNEAU AVANT ILLUSTRATIONEN PÂ FRAMSIDAN 3 FRONT PANEL CONTROLS AND THEIR FUNCTIONS The Front Panel illustration is provided on page 3. O POWER switch and indicator: Pressing this switch turns power on, causing the POWER indicator to light. To turn the unit off, press again. m SPEAKERS selectors: Allow you to select any of the speaker pairs connected to the A, B and/or C terminals by pushing the appropriate switch(es) to the ON position. NOTE:____ If speakers are connected to terminals B, but not to terminals C, be sure to press only the B SPEAKERS selector when listening via pair B. Pushing in selector C as well will cut off the sound from pair B since B and C are connected in series. (The same holds true if speakers are connected to C and selector B is pressed.) © PROTECTION indicator: Lights for several seconds after power is turned on, showing that the internal protection circuitry is currently activated. This mutes the output signal to the speakers, preventing the loud noise otherwise heard when switching on the amplifier. O METER switch: Switches the power peak meter OFF. (This power display is not Illuminated when the METER switch is pressed in.) © Power peak meter: indicates the power output on a logarithmically compressed scale from 0.002 to 600 watts (— 50 to +5dB), independently for the left and right output channels. Readings are accurate for the load determined by the LOAD selectors. @ LOAD selectors: These three switches let you adjust the peak power display according to the speaker load impedance. Wh« using more than one pair of speakers at the same time, you Cc work out their combined impedance with the following formula where X and Y are the impedance values of each speaker pai 1) 2 pairs in parallel (A + B or A + C) (X x Y) / (X + Y) = combined impedance Example for 2 pairs of 8 ohm speakers: (8 x 8) / (8 + 8) = 4 ohms 2) 2 pairs in series (B + C) X + Y = combined impedance 3) 3 pairs (A + B + C) Same formula as 1), with A = X and (B + C) = Y If the combined impedance does not correspond exactly to or of the three LOAD settings, select the closest one. LEFT and RIGHT LEVEL controls: These give you independent control over the power output levels to the L and R speakers This allows you to preset speaker balance for optimum stere imaging. These controls can also serve to protect speakers with power handling capacity lower than this amplifier's rate output. 4 CONNECTIONS The connection diagram is provided on page 32. ©CONTROL AMPLIFIER ©SPEAKERS A m SPEAKERSB ©SPEAKERS 0 Make sure the left (L) and right (R) channels are connected consistently between components. NOTE:___ Before making or altering any of the connections described below, be sure to turn off the power of the MX-70. CONNECTING A CONTROL AMPLIFIER Making sure that the control amplifier is also turned off, connect the output jacks of yourcontrol amplifierto the corresponding INPUT jacks on the rear panel of this unit. Always check that a) the RCA plugs of the connecting cord are clean, b) the left and right channels of both units correspond, c) connections are secure, and d) both units are properly grounded. CONNECTING SPEAKERS The MX-70 can drive up to three pairs of speakers (A, B and C) at the same time. Those connected to terminals A are in parallel with pairs B and C, which are in series. The following table shows the minimum load impedances per speaker for all possible connections. Number of speakers MX-70 terminals Minimum speaker load impedance 1 pair A or B or C 4 ohms 2 pairs in parallel A + B or A + C 8 ohms 2 pairs in series B + C 2 ohms 3 pairs A + B + C A: 8 ohms B,C: 4 ohms Be sure to use only speakers within the rated impedance range and with adequate power handling capacity. Driving speakers with extremely low impedance (or several low-impedance pairs simultaneously) at continuous ...