Traditional Tact room correction systems use one target curve that allows for full range 20-20,000 Hz room corrections. Once selected, the same target curve (same set of correction fi lters) was used at all listening levels. This approach did not take in account the fact that our sound perception, as described by Fletcher- Munson curves, is frequency and level dependent. Many of our customers have realized this fact and they have used the nine correction presets (available on all our RCS products) to program 2.0 S, 2.2 X and TCS MKII with nine different target curves each corresponding to a different listening level. In this way they were able to take into account the equal loudness curve effect by switching to new target curves as the master level changes.
Thus for a number of reasons it is clear that we need a room correction system that will perform room acoustics correction and at the same time dynamically change the target curve (correction fi lters) as the system listening level changes.
How does it work?
Dynamic Room Correction (DRC) offers a very sophisticated way of handling a multi target curve approach to solving equal loudness curve problem. The system is based on one reference target curve and eight additional target curves called dynamic target curves. The reference target curve is used to perform basic refer- ence room correction. Dynamic target curves are labeled 0, -6, -12, -18, -24, -30, -36 and –42 dB and are combined with the reference target curve to obtain the fi nal target curve used to calculate correction fi lters.
For example, if the master level reads –10.3 dB (89.6 on the relative readout) the system will use the –6 dB and the –12 dB dynamic target curves and by interpola- tion will calculate a target curve corresponding to –10.3 dB. After that the system will combine the 10.3 dB target curve with the reference curve to obtain the fi nal target curve that is then used to calculate the correction fi lters. New correction
filters are loaded into the signal path as the music is playing and the new correc- tion takes effect in a split of a second. The same process repeats again for any new master level setting.
