Installation guide

Use the IO Manager to select a microphone calibration file (if none is selected) and to adjust the

Master Volume for optimum measurement. If you have the microphone around 3 feet (1 metre) or

less from the speaker, we suggest a measured input level of between 80 and 90 dB SPL.

This may have to be adjusted depending on the gain of your amplifier and the efficiency of your

speaker drivers. With speakers with smaller drivers, you may find it necessary to use a lower

volume, because otherwise the bass driver may be driven to or near it's excursion limit at lower

frequencies. This can result in a frequency-response that appears rolled off at the lower

frequencies.

Note: the measurement process ignores any other settings that can affect volume, including Gain

Adjustment of the individual output channels.

If for some reason you need to measure one driver of a speaker at a different volume than

another driver of the same speaker, or if the drivers of a speaker has appreciably different

efficiencies, then the Master Volume should be adjusted between the individual driver

measurements (whilst the software is retrieving the data for and calculating the response for the

previous driver).

The software will warn if this occurs, but you can still ‘accept’ the measurement.

For Bi-amp or Tri-amp measurements, either or any of the drivers can be listened to in order to

set the level (the default is the woofer). For example, in the figure below the woofer is selected,

but the tweeter could be selected instead. This does not affect which driver(s) will be measured

during the actual measurement process.

For users with the Digital Output (HDP-4): If you are running the speaker measurements through

the digital outputs, you must select the output to be digital - use the Output Selection drop-down

box on the IO Manager. The measurement signal will be outputted at 96kHz.