Speaker Connections - YORKVILLE M8 Manuel De L'utilisateur

IEC Receptacle with Fuse Holder
and Spare Fuse Compartment

Speaker Connections

Two 1/4-inch jacks provide the loudspeaker connection to the power amplifier (one jack per
channel). A minimum 4-ohm loudspeaker load may be connected to each jack. To connect
two 8-ohm loudspeaker loads to one channel (the two 8-ohm loads in parallel equal a 4-
ohm load), connect one loudspeaker cable from one loudspeaker to a speaker output jack.
Connect the second loudspeaker on that channel to the second jack on the rear of the first
loudspeaker. Repeat the procedure for the other speaker output channel.
Power Amplifier Protection
The M8's power amplifier is protected from damage due to open, shorted or excessively low
speaker loads. It will continue to run into a low (less than 4-ohms) overall speaker imped-
ance, or even into a total short-circuit for a brief time, however the amplifier's defense
system will be activated. First, the amplifier will enter current limit. Then, if the condition
worsens, a thermal protection circuit will shut the power amplifier down. When this happens,
check your system for restricted air intake/exhaust at the M8. Also check for shorted loud-
speaker cables or connectors and/or reduce the number of speakers being driven. In a few
minutes when it has had a chance to cool down, the power amplifier will recover.
a. If the power amplifier shuts down as above, the mixer section will continue to
function. This means that, if the M8's power amp fails to come back on (unlikely)
and you have a spare power amplifier available, you can connect it to the M8 via
the Main Output jacks
b. Because the amplifier is also protected against open-circuit conditions, you
may use the M8 without any speakers connected, for example if you wanted to
do some recording.
AC Power Fuse
Located on the back panel near the Speaker connectors, the fuse's main function is to shut
the M8 down completely in case of an AC power overload. If the fuse blows replace with the
same type fuse. If upon turning the unit on the second fuse blows, have your M8 serviced
by a qualified Yorkville Service Centre.
General Operating Instructions
1. Connect the AC power cord to a 120 to 240 Volt AC grounded power outlet.
2. Turn the Main and Monitor Master controls to 0 (min) for now, then turn on the Power switch.
3. Connect low-impedance microphones to the 3-pin XLR type Microphone inputs (ch. 1 to 4).
4. Connect high-impedance microphones or mono line-level signal sources - i.e. the output of a
mono-mixer, an electric instrument, etc. to the combination1/4-inch/XLR BAL Line IN jacks.
5. Connect stereo sources - tape deck, CD-player, stereo keyboard, instrument, etc. to chan-
nels 5/6 and 7/8, via the RCA (phono) type inputs. Stereo sources may be connected to
channels 1 through 4 if you use two of them, one panned left, the other right.
6. Using speaker cables (see under Speaker CONNECTIONS) connect one or two 8-ohm or one
4-ohm speaker to the L SPEAKER OUTPUT on the back panel. Similarly, connect one or
two 8-ohm or one 4-ohm speaker to the R SPEAKER OUTPUT.
7. Position your main PA speakers at the front of the stage, pointing directly out at the
audience. If you use a separate monitor amplifier, connect the AUX Send output to the
amplifier input and after connecting the monitor loudspeakers to the amplifier's output,
position your monitor speakers on the stage floor, in front of the microphone stands,
pointing up at the backs of the microphones (remember to use cardioid or uni-directional
microphones to reduce the threat of monitor feedback).
8. During a sound check with the band playing or other sources feeding the mixer inputs,
make the following control adjustments:
a) Set the channel Low, Mid & High EQ controls and PAN controls at center. Now set the
Channel Level, and AUX Level controls to 0, and the Main EQ controls at the center position.
b) Set the Main Level control to 7.
c) Now bring up the channel level faders slowly until each channel can be heard at the
desired volume level through the main PA speakers.
d) If the AUX Send is being used as a stage monitor output, turn up the channel AUX
7