Meyer Sound CQ-2 Operations Instructions download pdf (Page 10)

Verifying Polarity

Incorrect driver polarity impairs system performance

and may damage the drivers. All Meyer Sound

loudspeakers are shipped with the drivers in correct

alignment. However, if the driver or circuit wiring has

been removed or disassembled in any loudspeaker in

a system for any reason, check the polarity between

adjacent loudspeakers and between drivers in the

same cabinet.

Polarity Between Adjacent Loudspeakers

Use the following test procedure to verify the polarity

between adjacent loudspeakers of the same type:

1. Position two loudspeakers adjacent to each other.

2. Place a measurement microphone six ft from the

speakers on the axis between them.

3. Connect a signal source to one speaker and note

the frequency response and overall level.

4. Apply the same signal to the second speaker with

the first speaker still connected.

Correct polarity causes

acoustic addition

Opposite polarity causes

acoustic cancellation

Top view of adjacent speakers with

measurement microphone

The polarity is correct if the frequency response

remains constant with a significant increase in

amplitude. Broadband cancellation (decreased overall

level) indicates polarity reversal.

Driver Polarity in the Same Loudspeaker

Use the following test procedure to verify polarity

between drivers in the same loudspeaker:

1. Place a monitoring microphone three ft from the

front of the loudspeaker at the midway point

between the low and high frequency drivers.

2. Connect a signal source to the loudspeaker and

note the frequency response.

Since polarity reversal causes excessive driver

excursion at high source levels, use moderate levels

when conducting this test.

Drivers with correct

polarity cause acoustic

addition

Drivers with reversed

polarity cause acoustic

cancellation

The polarity is correct if the frequency response is smooth

through the crossover region (±4 dB 600 Hz – 1 kHz).

Severe cancellation in the crossover region indicates

polarity reversal.

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Meyer Sound CQ-2 Operations Instructions Page 10

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