Can someone else show their WinISD results with TS parameters showing?
Edit things are looking better, I have re-installed winISD and adjusted the TS parameters again, running a butterworh second order at 17hz with a 506 liter cab tuned to 20hz, looks reasonable?
Qts 0.504
Vas 6.039
Fs 25.00Hz
Re 3.840 ohm
Le 0.50mH
Xmax 8.5mm
Z 4.00 ohm
Qms 6.080
Qes 0.550
SPL 93.00 dB
Pe 300w
BL 8.20000 Tm
Dd 13.00 in
Sd 132.83
So are the RE and BL figures I entered above correct? Why does the JBL brochure state 0.96 for VC Dc Resistance? is this different when both are wired in series for a 4ohm load hence the figure 3.84 you guys mention?
With the above figures I have used, and a 600w input I am looking OK in WinISD, even with a 700 litre cabinet I look OK, it seems to have a more even maximum SPL line with less tail off than 506 litres? An extra 2 to 3db around 20hz? 114dB at 50hz down to 113db at 20hz with come excursion peaking at 7.9mm at 14.90hz and port velocity peaking at 13.572 m/s at 18.77 hz with four 4.02" + 10.85" ports
Cabinet size and design seems quite a lot of work, so I am still busy calculating what braces and battons and such equate to what volume........
You're using the wrong graph. Switch to the SPL graph, that shows you what you get with the input power and HPF that you use. In 9 cu.ft. tuned to 20 hz you should be able to get away with 200 watts input and a 2nd order HPF at 18 hz.
I’m assuming you mean multiple subs? I agree that multiples is they way to go but not at the expense of output and extension. IE: if you have a bunch of smaller subs with an f3 if 30hz, they still won’t be able dig very deep. I know there’s more to HT than extension, but imo it’s at the top of the list. For movies especially.
I've been planning to upgrade my entertainment center's audio setup for a while now. Usage is probably around 50% video games 40% movies/tv and 10% music. It's in a large (~6600 cubic feet) basement (22x40x7.5 dimensions). The actual viewing/listening area is in one corner in about a 10x10 foot zone.
Right now they only things I own are a Denon x1300w receiver and a pair of old but decent bookshelves that I got used for free. I'm planning on buying a set of LCR bookshelf speakers, moving my current bookshelves to 192.168.100.1192.168.1.1 be surrounds and getting a subwoofer. Max budget for the whole thing is no more than $1500. I can go a bit higher if I have to but I really would prefer not to.
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