Yamaha MX-800/U - Page 7

@ POWER switch and indicator: Pressing this switch turns power
on, causing the POWER indicator to light. To turn the unit off,
press again.
@) SPEAKERS selectors: Allow you to select any of the speaker pairs
connected to the A, B and/or C terminals by pushing the ap-
propriate 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. |
@ 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), in-
dependently 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. When
using more than one pair of speakers at the same time, you can
work out their combined impedance with the following formulas,
where X and Y are the impedance values of each speaker pair:
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
lf the combined impedance does not correspond exactly to one
of the three LOAD seitings, 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 stereo
imaging. These controls can also serve to protect speakers
with power handling capacity lower than this amplifier’s rated
output.