3
Using the PSW-6
The PSW-6 exhibits a cardioid coverage pattern across
two full octaves from 30 Hz to 125 Hz. The power band-
width of the PSW-6 is designed to complement MSL-4
and MSL-6 systems.
The cardioid coverage pattern is created by a complex
electronic and geometric relationship between the four
drivers at the front of the cabinet and the two drivers at
the back of the cabinet.
This coverage pattern is very stable in one or two cabi-
nets and holds up in horizontal arc arrays and vertical
line arrays, provided that the array is assembled and
aligned according to the methods described in this
manual. The horizontal and vertical response pattern of a
single PSW-6 can be found on the PSW-6 data sheet.
Performance Verification
Meyer Sounds SIM® system II is recommended for
performing the measurements described in this docu-
ment.
To verify the performance of a PSW-6, place a single
PSW-6 on the ground in a large open space* and posi-
tion the measurement microphone as shown in the
illustration below.
When the PSW-6 is placed on the ground, an image
is created from the ground reflection. This ground
reflection is represented by the dotted PSW-6 in the
illustration below.
Note that an on axis ground plane measurement at a
minimum distance of 5 meters is necessary for accu-
rate low frequency measurement in this particular ap-
plication.
As a general rule, the minimum distance of the mea-
surement microphone from the front of the cabinet
should be equal to the height of the array. A distance
of at least three times the height of the array is ideal.
A single cabinet is roughly one meter high, but when
considered with its ground reflection, the height of the
array becomes two meters, or two cabinets in height.
This necessitates a minimum distance of 2 meters
between the front of the cabinet and the measurement
microphone. In this example a 5 meter minimum
distance is ideal as it is about three times the height of
the array.
Perform and store an initial measurement at this posi-
tion and then repeat the measurement at 5 meters
behind the cabinet.
If the dB SPL measurement taken at the front of the
cabinet is at least 15 dB greater than the measurement
taken at the back of the cabinet, the PSW-6 is function-
ing properly. If the PSW-6 does not meet this basic
performance verification specification contact Meyer
Sound Technical Support for further assistance.
* The time record for low frequencies in SIM is 640 ms. In order to prevent reflection from corrupting this free-field
measurement the PSW-6 should be at least 200 meters away from any large obstacle or boundary like walls or
buildings. If the nearest obstacle is less than 200 meters away then the rear of the cabinet should face the closest
large obstacle as this will minimize reflections during measurements.
image
ground
mic
