- #BASS REFLEX SPEAKER ENCLOSURE DESIGN HOW TO#
- #BASS REFLEX SPEAKER ENCLOSURE DESIGN GENERATOR#
- #BASS REFLEX SPEAKER ENCLOSURE DESIGN DRIVERS#
Turn up the level until you see cone movement less than Xmax (less than 15mm peak to peak for your speakers).
#BASS REFLEX SPEAKER ENCLOSURE DESIGN GENERATOR#
Using a sine wave frequency generator into an amplifier connected to the speaker, choose a frequency about 10 Hz below Fb. To check Fb start by painting a white dot on the cone. Use plenty of glue and screws, brace all the large panels. The more plys the better, 13 ply 19 mm Baltic Birch would be the best material if you can afford it.ĭifferent wood will sound slightly different, MDF requires more bracing than plywood to be as stiff, but is heavier, and slightly more inert than lightweight plywood.
I would suggest building your box from good plywood, there is no reason the “test box” can’t be used as the “real” box. Putting a larger circle ( or whatever port shape used) around the inside of a port improves the high volume response (less port compression) but also makes the port appear “longer” than predicted. PVC or cardboard ducts work OK, but don’t provide much area on the inside to round off. These ports usually need some adjustment in length to match predicted Fb using circular ducts, so I make the ports longer initially, then cut them down until the cabinet tuning is correct. I almost always use ports made of plywood, in various shapes, triangular, or square are preferred, though in some cabinets a wide rectangular port fits best, in which case dividing the rectangle in to more square like portions gives better results. Details like bracing strip position and distance of the port to walls will affect tuning a bit. If you changed port lengths and depths to “equivalent “ values, they may or may not result in an equivalent tuning (Fb).
If you doubled the cabinet volume and doubled the ports leaving them the same size as the Fane 200L, your dual cabinet should be the equivalent of two of the Fane 200L cabinets.įs will go down slightly in a dual compared to a single, but that does not change Fb. Sorry, don’t have time to closely check your work. You are all invited to our parties if the speakers project succeed Really apreaciate your help and this cool forum Sorry for this long long post and if there are too many questions, and if there are not really smart I'm new, and my english either makes me look dumber Pd: any advice for construction? wich cheap wood is good enough for my test-speaker and won't influence that is cheap on the results? Wich material should i use for the ports? Rigid PVC right? any thickness better than other?Īnd another dumbie question i just though, to trim the ports while tunning to the Fb, do i glue them all time and test? Or how do i stick them, test, and cut ? Any good method? Here i leave a table i copied from my excel calculations: And maybe i'm just going completely wrong I think its really really big, and before i start building it, and spent money with the woods, i would like to know some opinions, because this is my first design/construcion of a speaker. So i changed a bit the dimensions, keeping the same volume W=1,29m, H=0,54 and D=0,63.
#BASS REFLEX SPEAKER ENCLOSURE DESIGN DRIVERS#
Well, with a volume of Vb(L)= 442,1453 L and using the golden ratios of 0,62x1x1,62 i get a box dimensions of W=1,23m, H=0,47 and D=0,76, wich are really bad dimensions, because my driver has a diameter of 0,48m and i kind of draw it in paper and the 2 drivers with the 6 ports don't really fit in 1,23 of width. That gives me Sv' and Dv'=0,103m I'll keep the Lv the same right? Or i divide it by 6 too? :S Then i divide the Sv by 6 (Sv/6=Sv') because i want to make 6 cilindrical ports. I think i'll get try the first one and start trimming while tunning as they've told me at this forum Wich i can verify that my suposition of QL was correct because Vb>80L (atleast this is how my book says to verify your QL) for a C4 Alignment for a QL = 3, that gives me a volume Vb(L) =442,14539. Now i can calculate the Vab,Fb,Fl,Lv, Sv, etc.
#BASS REFLEX SPEAKER ENCLOSURE DESIGN HOW TO#
I got one drivers T/S parameters (i know that when i buy the driver Fane Colossus 18XB, i'll calculate T/S parameters instead using the spec from manufacturer ) Cause i want to drivers 2*Vab and 2*Sd right? I'm not sure how to predict, or mesure how Fs will change once they are together (electrically in paralel) any ideas please? Well here i have my design, could you check it? And tell me if i'm completely wrong? nearly nearly? or good enough to do a test? I have to write it with my own language Spanish, and i write it a little bit better than Englishīut anyways i'll use a spell check just to please you