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Introduction
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Before proceeding, it is assumed (and mandatory) that you’ve read the ART Guidelines and the other Application Notes from Dirac:
StormAudio x Dirac Live ART - Setup Guide
App. Note 1: Channel grouping and support settings
App. Note 2: Infra bass bypass
Based on this, you should already be well aware of the ART technology and the different settings available within the Dirac Live calibration tool.
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A good rule of thumb is to trust the speakers datasheet for frequency range, often indicated as such (here is a subwoofer):
Frequency Response | 20 – 200 Hz +/- 3 dB |
| Info |
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Another but really more advanced way to check the frequency range of a speaker is to measure it, but from near field distance to take the room out of the equation. This can get really time extensive and not needed for most rooms but if you want to get as close to the real frequency response of your speaker it’s the way to go. |
Once we have extracted this information for every speaker, here is what it should look like:
Speaker | -3db low frequency | high frequency |
|---|---|---|
L&R | 35 | -- |
C | 60 | - |
SUB 1 | 13 | 80 |
SUB 2 | 25 | 120 |
SUB 3 | 20 | 90 |
LS & RS | 80 | -- |
LFT & RFT | 120 | -- |
Table 1: Speaker Response based on datasheet
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In our previous example, the three subs cannot reproduce frequencies above 120Hz. To ensure a good LFE reproduction, and provide ART more liberty to correct the LFE signal, we will add the L&R speakers as support:
SUB 1 supports | Low frequency support range | High frequency support range |
|---|---|---|
L&R | 35 | 150 |
SUB 1 | 13 | 80 |
SUB 2 | 25 | 120 |
SUB 3 | 20 | 90 |
Table 2: Subwoofers Focused Response Datasheet
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