What plan for single pd186

I don’t think that would help, seeing as the signal is already reaches clipping from the mixer if I turn it up too loud. Or did I misunderstand your idea? 

Yeah the phone was just to get an approximation. We had it in a corner in the past, but it still gets cancelled a lot in the middle where the people are. 

You will get that same cancellation with any other cabinet. It is just not possible to have perfect coverage in such a room. 

Yeah I used the NIOSH app, did you do the study I found it from? https://pubmed.ncbi.nlm.nih.gov/32108336/

Edited by Jarba - 05 May 2022 at 11:59am

Jarba wrote: Yeah I used the NIOSH app, did you do the study I found it from? https://pubmed.ncbi.nlm.nih.gov/32108336/ So building another 18 could solve our problem? I’ll play around with placement and see if theres a decent place to put it. I heard about putting the sub in the listening position, and then put it at the spot it sounds best. Does this work? If so I’ll go around with the db meter and put it where it’s loudest

No, my work was for a degree module so is unpublished - although the results were used as part of some larger work at the time.

If you're using the NIOSH app, make sure you change the weighting in the app setting from the default of dBA to either dBC or dBZ. Not doing that will mean your readings are filtering out the majority of bass content, which would explain the discrepancy against the levels you expect.

dBZ is unweighted, although dBC is closer to what you'll perceive in a loud gig environment.

From memory, the NIOSH app will display "CLIP" on the screen if the mic is saturated.

As for the method of putting the sub in the listening position, yes this works perfectly well via the principle of reciprocity. It's less effective with a larger listening area such as a venue than it is when you can plonk the speaker on your chair or sofa, though.

If you do want to give it a go, it would be best to do this with a continuous pink noise stimulus into the sub. Your auditory memory is very short, and you'll struggle to hear the dips in response as you move around the room with music playing.

It would also be best to use some app or method to save the frequency responses at the various positions.

Mark those - either put something bright on the floor, or make a floor plan doodle - and repeat the test at the same locations with the sub placed in three or more spots across the listening area. You want >9 measurement positions per source position to characterise the response of a space.

The SPLnFFT app is only a few quid, and you're only concerned about the relative changes in response from location to location so using your phone in 'unweighted' is fine.