22
NOT CORRECT
CORRECT
SPEAKERS SHOULD ALL MOVE IN THE
SAME DIRECTION.
7.) Put the Grill back on
8.) Test the cabinet
3.2) TESTING THE CABINET
CHECKING THE PHASE
There is a simple method to check if all the speakers in a multi-speaker-cabinet are in phase. All you need is a 9V battery and a speaker
cable. Connect the speaker cable to the cabinet and take the jack connector at the other end and let it touch the poles of a 9V
Battery (one pole on the tip and the other on the sleve of the jack connector). This will result in a Plop and the speakers will move either
inwards or outwards depending on which way you connect the battery. It is important that both speakers move in the same direction. If
they don’t then you know that they are out of phase (check that the wiring on all speakers is the same).
NOTE
Some speakers have a lighter cone and will also move if the air pressure changes within the cabinet. For example, if you do the above
battery test on a 212 cabinet with Celestions Vintage 30 and you just give the speakers a short impulse then it may appear that the
speakers are moving in different directions. In this case, make the battery connection and hold it – the speakers should all move in the
same direction and stay there as long as you keep the battery connected.
CHECKING THE IMPEDANCE
You can check the impedance of your cabinet using a simple Ohmmeter or Multimeter. Connect a speaker cable to the cabinet and
hold the test prods of the multimeter to the other end. Set the Multimeter to Ohms (resistance) and note the reading.
NOTE
Keep in mind, the reading of the multimeter does not show the impedance (which is frequency dependant), it is just showing the resis-
tance. So the readout will not be exact but close enough to verify that the speakers are wired correctly. For example an 8 Ohm speaker
can have a readout of roundabout 6.5 or 7 Ohms.
Be sure to test the cabinet with an amp before you take it on tour or to a gig. Start at lower volumes and then slowly increase the level. If
there is no sound then stop playing, turn the amp off or to standby and double check all the connections.
MANUAL
