Meyer Sound MSL-6 Operations Instructions download pdf (Page 11)

Use the following test to verify polarity between high

and low frequency drivers:

1. Place a monitoring microphone 5 ft from the grill

frame, 24” below the top of the cabinet, at the mid-

point between low drivers (center-line of cabinet).

2. Connect a signal source to the loudspeaker and

note the frequency response.

The polarity is correct if the frequency response is

±3 dB 500 Hz – 1 kHz. Polarity reversal is indicated by a

6 – 12 dB cancellation in the same range.

Polarity Between Adjacent Loudspeakers

Use the following test procedure to verify the polarity

between adjacent MSL-6 loudspeakers:

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.

The polarity is correct if the frequency response remains

constant with a significant increase in amplitude. Broad-

band cancellation (decreased overall level) indicates

polarity reversal.

Phase Poppers

We do not recommend using phase poppers to analyze

driver polarity. The phase response for all drivers varies,

to some degree, over the frequency range in which it

operates. Since phase poppers do not discern variations

in phase with respect to frequency, they do not provide

accurate information about the phase response through

the crossover.

Phase poppers are, therefore, not useful for performing

phase measurements on individual loudspeakers or full-

range sound systems containing one or more crossovers.

If necessary, apply a phase popper only to loudspeakers

with identical drivers without a crossover, and check

the overall system phase response with a frequency

analyzer and/or listening test.

1 2 ... 6 7 8 9 10 11 12 13 14

No comments

Meyer Sound MSL-6 Operations Instructions Page 11