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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.