Rane THX Room EQ User Manual
Page 18
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Home THX Equalization Manual Rev. 1.5
18
2.6) Re-analyze:
After applying the corrections to the appropriate channel frequency centers, re-run the above
procedure to verify the corrections. You will find that you will have to measure and correct several
times to achieve a balanced and repeatable response.
NOTE: ABOVE 1 kHz, IN TYPICAL ROOM ENVIRONMENTS, THE SOUND FROM HOME THX LCR
SPEAKERS IS DIRECT FIELD DOMINATED AND THE FREQUENCY RESPONSE MAY BE POSI-
TION DEPENDENT. AVOID DRAMATIC EQ CHANGES ABOVE
1 kHz. SINCE WE ARE MORE
SENSITIVE TO FREQUENCY PEAKS THAN DIPS, USE THE CONTROLS AVAILABLE SPARINGLY
TO REDUCE HIGH FREQUENCY PEAKS, RATHER THAN TRYING FOR RULER FLAT RESPONSE
.
Avoid radical EQ beyond this point.
Typical Unequalized Room Response
Frequency Hz
dB
SPL
60
65
70
75
25
40
63
100
160
250
400
630
1000
1600
2500
4000
6300
10000
16000
Fig 11
Repeat the above procedure for each front channel. Use the appropriate track on “Wow!” or your
pink noise source, and remember to connect only the speaker that you are testing.
Your LCR channels are now equalized.
NOTE: IN INSTALLATIONS THAT ALLOW FOR SYMMETRICAL L/R SPEAKER ROOM PLACE-
MENT, CONFIRM THAT THE EQ SETTINGS FOR L & R CHANNELS ARE APPROXIMATELY THE
SAME. Small variations of 1 dB in individual 1/3 octave bands are tolerable. In asymmetrical L/R
speaker placement, larger variations in EQ curves are acceptable; particularly at the lower frequencies
where boundary effects are most common.