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Comments
Thanks John,
I am surprised that the Weight is not displayed in the legend, it is an important factor.
That dark blue line looks pretty good. Can you run it again with 50 or 100gms more ?
I am wondering about moving the knee from 29 in your graph down a little to say 26Hz say. What are the "leaks"? Certainly not air escaping from the cabinet....
Are there any drug dealers here ?? I need to be able to weigh things in grams, possible 200 of them, but nevertheless I need access to scales in that range, not to mention enhance some late night listening sessions. Perhaps there is another method than scales with weights that have been filed down.
Hm Nigel, why don't you run it?
Here, you'll learn something: http://audio.claub.net/software/kougaard/ubmodel.html
:x
I use a digital kitchen scale from Kmart. It's 3kg max, resolution 1g. Might not be super accurate in the 100g range but close enough for the purpose at hand.
OK here you go: http://www.kmart.com.au/product/electronic-kitchen-scale/161801
I think I'll take my bike for a ride down to Newport with some washers and a bottle of wine under my arm. Prefer to spend on some wine rather than spend on 1-time only scales. Got a system worth sampling, yet ?
Nope.
Hey John!
You might need something to bit down on while you're doing all that bending over for Nigel... X_X
I have some high voltage coupling caps about the right size...
PS Do NOT Google images for "electric shock"
I found the brand and an image of the sub driver & PRs I have. Anyone have any driver info. A bit thin on the ground...
They are supposedly 7 and half inch drivers.
In actual fact they more like 6" drivers. They measure 7 and a half inches including the roll surround.
But I do now know it is a 0.6 cubic foot enclosure. 17 litres.
Gawd, that's ittsy bittsy teeny weeny compared to my 18" 250 litres behomeths.
http://www.definitivetech.com/products/supercube-2000
http://www.ebay.com/itm/DEFINITIVE-TECHNOLOGY-SUPERCUBE-2000-COMPACT-POWERED-SUBWOOFER-SUPER-CUBE-NEW-/400659718990?_trksid=p2054897.l5672
http://www.advanceaudio.com.au/#/catalogue/def-tech-supercube-2000-each
So all I need now is a sub amp small enough to fit on the back of the enclosure I have to build.
Any ideas?
Hi Graham, seems pretty simple, just build a box that volume. Odd, though, if I use the published dimensions I get 12.8 liters with 18mm material and 14.8 liters with 12mm material. I guess I'd go for 290mm cubed and see how it went.
HI John
Do you have a spare PWR-ICE125 DSP Amp lying around for sale?
HI Graham, not at present... maybe later this year.
Looks like I may be able to get a 'brand engineered' 2nd hand plate amp for $150
http://www.wescomponents.com/datasheets/subwoofer_amps/S400W_Mods.pdf
Pick it up tonight
Nice.
I can only imagine how far a 6" driver must travel when trying to deliver sub 40Hz at a reasonable SPL. Any chance the PRs are bigger? say 8". If so maybe an 8" driver might help. I got a 6" pianist for Xmas one year......
John, I am tying to use Unibox and am having trouble entering some of the PR specs.
eg ones in Red appear to be Read-Only eg Vasp, Cmp, Rmp. The values in the spreadsheet do not match the data sheet from Scanspeak. What gives ?
It's only a tune up sub for the rear of the room, so I don't expect it to do too much work.
It's an easy build that won't cost me much.
I may even have enough ply left over over from my 18" subs build. :-b
Just put in the Q, F, mass, Sd, and Xmax/mech. The red ones are calculated from those.
Thanks John, Ok I have put the specs in as you recommend and the graph displayed looks similar to the one you produced, but when I alter the mass, the graph remains unchanged. Is there a Run button to recalc everything that I am missing ?
Yes, the one that says "Update".