New loudspeakers & room digital correction service

[SwissBear]

Traditional room correction tends to reduce bass peaks (easy to do), but does little to 'fill' bass nulls (difficult to do) caused by room reflections.

Is this this equally true of these HAF filters?

It's not different, for a 'mechanical' reason which is that you cannot fill a bottomless hole.
In more technical terms, you can only bring appropriate correction to the upside to a system when it behaves as a minimal phase system. Which means when you look at the Group Delay (GD in REW) and this Excess Group Delay is not very different from 0.

To illustrate, on my main system, which amplitude (SPL) is here:
[img][/img]

you cannot fill the gaps bellow 80Hz because of this:
[img][/img]

The technical explanation is on page 54 of this manual: http://www.roomeqwizard.com/REWhelp.pdf

The only way you can act is to position the speakers and the listening position in order to solve this problem.
Please note that REW has a function (RTA) which allows to listen to a pink noise and look at the screen while changing the positions of the speakers and the microphone for this purpose.