Yesterday was our soundcheck summer special. Due to the vacations we found ourselves in a small but fine round.
The topic was ‘room correction’. Leo from Orchardaudio has published on Youtube a great video for Volumio to implement the room correction (DSP). FusionDsp : the complete Dsp center for Volumio3! - #1009 by orchardaudio
We now listened to the music while I sometimes activate and sometimes deactivate the DSP. A blind study was not possible this way, but we didn’t find it necessary either. With effects, the DB level was always slightly lower as described in Leo’s video. Therefore, I also slightly changed the volume when switching.
The effects were not as big as you know it from EQ presets (‘pop’, ‘rock’, ‘classic’, e.g.). We were able to understand the corrections and operation of the EQ filters.
For example, when the midrange was slightly reduced, a vocal was more integrated into the music than it was before.
With classical music in the bass range, the EQ made the low tones muddy. We couldn’t really place the instruments at all. However, not all of us were able to perceive the low tones so accurately.
I noticed that the room sound was thinner with EQ, without it it was clearly more filled out.
One of us said that the music sounded slightly better with EQ.
One of us said that depending on the music genre, it might make sense to turn on the EQ.
One listener said that the EQ would take away the liveliness of the music. The range in the low frequencies would be particularly affected. EQ would not come into her house, she said 
So it is not clear that DSP improves the sound impression. For some it may be good, for others it doesn’t work at all.
Maybe you need to delve deeper into the matter to benefit more from it.
Thanks for coming. Thanks leo for the explanation video.
