Rane THX Room EQ User Manual
Page 16
Home THX Equalization Manual Rev. 1.5
16
2.3) Home Theatre and Test Equipment Set-Up
Home Theatre Equipment:
•
Switch your Home THX Controller to the “Dolby Pro Logic Surround” mode. The Home THX
Cinema mode must be switched off for this procedure.
•
Disconnect or disable the Subwoofer and the channels you are not measuring. You want to ana-
lyze each channel individually and disconnecting unused channels helps prevent assignment
errors. One installer spent a frustrating hour trying to EQ a Center Channel speaker only to find
that he had been playing pink noise through the Right Channel speaker.
•
Calibrate the individual channel levels as usual using the internal test signals and a reliable SPL
meter.
•
Set the System Volume at Reference.
RTA Equipment:
•
Defeat any weighting on the RTA portion of the analyzer (e.g., “C” weighting). Measurements are
to be taken with flat response.
•
Set the analyzer to Slow Response.
•
Set your analyzer’s scale to the appropriate SPL range, and the dB per division scale to 2 dB.
Pink Noise Sources:
Pink Noise can be obtained from one of the following sources:
•
The “Wow!” laser disc, Chapters 8-10.
•
An external calibrated pink noise source (200 mV RMS) placed into each channel’s EQ input.
2.4)
Real-Time Analysis:
Start your pink noise source. If using “Wow!” Chapters 8-10, put the appropriate track on A-B
repeat so that it conveniently cycles automatically. Placing your microphone at a reference position
(Microphone 1). Take three or four measurement samples and store each reading into a memory
position of the analyzer. Average these readings and store the average in a memory location. Repeat
the procedure at each of the other three locations chosen.