Cloud Electronics VTX-WM1 - Manual (Page 13)

VTX-WM1 Installation Guide v1.2 13
test must be run, to establish a reference
impedance at the frequency to be used. The
upper pane of the Test List page is concerned
with this initialisation.
Configuring the Load
The amplifier must be powered on and each
channel connected correctly to its normal
speaker(s). Select each channel in use from
the drop-down list under
Channel. (If any
channels are in Bridge Mode, select the lower-
numbered channel of the pair.) Select the
frequency to be used for the test from the
drop-down list under
Frequency. If using a
bi-amped (or tri-amped, etc.) speaker system,
the frequency for each channel will need to
chosen to match the relevant driver type. The
frequency selected should be approximately in
the middle of the frequency response range of
the speakers/drivers connected to the channel.
Consideration should be also be taken of any
loudspeaker enclosure resonant frequencies
– these may be particularly evident at low
frequencies, and should be avoided, as their use
will give misleading results.
Click the Config button. This will generate
a dialogue box warning that a test tone is
about to be fed through the audio system.
Click OK if you are happy for this to occur.
A progress bar is displayed, and when the
test is complete an impedance value will be
displayed in the
Expected field. To re-check
the expected value, set a Tolerance value
(30% is recommended initially) and click the
Test button. A second test will be run, and
the results displayed.
The DB Management controls allow the
reference database to be cleared. Select an
action from the list and click Drop to perform
that action over the database.
•
Reference – drops the currently selected
reference
•
Unused Refs – drops all references not
used in scheduled tests
•
All Tests – Clears all scheduled tests and
references from the database.
The test database for a single module will
hold up to 32 entries including references and
scheduled tests. If this limit is exceeded, clear
any unused references from the database.