Hello, everyone. I have had 2 of Procella P18s , P8 x 3 as LCR, P6 x 2 as side surrounds and P6V as surround backs.
I am building my home cinema. The baffle wall is being built and P8x3 and P18x2 are going to be in the baffle wall for functionality and cosmetics(to make the room clean like cinemas).
I have attached a photo to show you. My room is 4 meters wide, 6.8 meters deep, 2.9 meters high. I hire a HAA and THX certified calibrator to built my home cinema. He has all HAA equipments. My room has a major dip at 40 Hz(dip 25-30 dB) and I can't move 2 of P18s. As you can see an attached photo, that's the best position of 2 of P18s in baffle wall. My calibrator has put the microphone at 1 feet from the woofer of P18, the graph begins to roll off at 35 Hz. This brings a lot of questions.
1.How much exactly can P18 go deep? In the tech sheet of P18, it was typed -3 dB point 21 Hz and on the website, it was typed "This gives the subwoofer a stunning 134 dB (139 dB peak) output capability, and sub-bass extension to down below 18 Hz.". This is making me confused because HAA microphone can measure only 35 Hz, not deep to 21 Hz or below 18 Hz as they claim.
2.If I would like to get real deep bass down to 20 Hz, can the Procella V18 really go deep to 20 Hz? On the website it was typed "We outdid ourselves with this subwoofer – the V18 takes Procella low frequency performance to 11 Hz. That’s why we call it The Bass Engine!" Right now I'm very curious. I know that V18 is really too big for my room size.
3.What is your recommendation to solve my room mode (40 Hz dip, 25-30 dB, really huge dip)? I and my calibrator agree to add 2 of subwoofers at the back of the room, so there will be 4 subwoofers in my room.
As I have 2 of P18s in my baffle wall, which 2 of Procella subwoofers do you recommend for my room to solve my 40 Hz room mode? I don't need P15a because I don't like active subwoofers and I think that P10Si is too small to solve 40 Hz (too small woofer to go deep).
I have additional information : I have been using one Lab Gruppen PLM20000Q power amplifier for 2 of P18s. All EQs and any other settings on PLM20000Q are off to find the best position of subwoofers and bass frequency response without any help of EQs. My HAA calibrator will use bass management at 80 Hz as THX and the manual recommend for the Procella P8, P6 and P6V.
Thank you so much for all your help.
Last edited by Nattypol; 03-11-2019 at 07:57 AM.