Cube of speakers - Passive radiator subwoofer build 

This is the question I also posed. "Most people" wouldn't want a "subwoofer" to only play in the ~40hz range at all - at least most "knowledgeable" people.....

I actually haven't played with pa drivers yet.

Hi maxim, I did try that, I have a 18" dj subwoofer in my living room, connected with RCA's, for music and especially watching movies, it is AMAZING!

There may be some difference when it comes to bookshelf, floorstanding speakers. However, for subwoofers I doubt there is any.

Volume is fine in my opinion, turn it up if you find it low. All PR's are tuned to the same frequency, yes. And last question, I assume you are asking how I wired the speakers. Both speakers are wired in-phase.

I use MDF

There is no xover. This is a subwoofer

Se ia in considerare si aria difuzorului, nu doar Xmax. Daca inmultesti aria difuzorului (Sd) cu Xmax iti da un parametru care se numeste Vd (uneori il gasesti in lista de parametrii). Vd-ul radiatorului pasiv trebuie sa fie de cel putin de 2 ori mai mare ca Vd-ul difuzorului activ. Daca e de 3 ori mai mare eu zic ca esti safe. Sincer eu m-as uita la radiator pasiv de 10" sau 2 de 8"

Salut , am construit boxa am luat 2 radiatoare pasive dayton audio epique de 7 inch , problema e ca fs a ajuns la 31hz (hz 0:01

Cred ca te referi la Fb (resonant frequency of the box). Si de ce e problema? Vrei mai jos? Mai adaga greutati pe radiatooarele pasive. Ele vin cu niste discuri care se prind pe spate. Sau daca vrei Fb mai sus, mai scoate din discuri

Scuze , nu terminasem mesajul ca m am luat cu altceva și nu știu de ce sa trimis :)) . Am văzut pe yt ca poți sa vezi ce FS ai daca rulezi o aplicatie cu diferite frecvente și la o anumita frecventa difuzorul nu se misca deloc acolo e FS subwooferul ui , la 31hz nu se misca difuzorul iar pasivele se misca foarte bine , nu este ideala o frecventa de 37-38 hz ? Pasivele nu au nici o greutate adăugată, am scos și șurubelul în speranța de a creste în fs :))

Nu exista o frecventa ideala. Mie mi se pare mai bine 31, dar fiecare cu preferintele lui. Nu mai ai cum sa ridici Fb daca ai scos toate discurile. Doar daca mai adaugi un PR (sa fie 3 la numar)

Dayton audio spa250. But you need something with roughly 500w at 4 ohm

@@AudioJudgement thank you! And how are the subs wired? Could you please provide a diagram?

They are wired in parallel.

@@AudioJudgement thank you sir! And thanks for the great videos

I totally agree with you and I much prefer a sub tuned lower. But in my experience people like to tune it higher, because they get more output from a smaller box. And I heard people say that "the port is not tuned correctly since it's barely moving any air" (port tuned at 21 Hz). That sub was playing linearly down to 20 Hz, but since many tracks don't have 20-30 Hz notes, it seems that the port is not doing anything. I might be wrong, but this is my experience, that people tune the box higher, not necessarily for the right reasons.