I was thinking that myself. This looks like a good candidate to me, given the price and friendly Qts.
http://www.ascendantaudio.com/assassin10specs.html
http://www.ascendantaudio.com/assassin10specs.html
GM said:
Thanks, this looks like fun. Speaking of burning wood, what is the cheapest grade of ply useful for experimenting? Some of these designs would cost a bit of money to build up with nice Baltic Birch (also, the genuine stuff in 5x5 sheets isn't of much use here). I've seen some 4 or 5 ply that doesn't look too bad; will it give one an idea of an enclosures merit? HD up here carries some 13ply veneered (oak or birch) stuff that has a few voids and sells for $35 a sheet. I know ply has been discussed before. As I recall, most discussions have been finding the ideal rather than minimum workable quality.
>>> Is there any way to present whatever FR info that MathCad spits on regarding each sim?
I would like to see the FR charts too. I can't get mathcad to work on my pc... Whatever i'm supplied with i will find a way to put it onto the webpage.
Big thanks to Scott for the time he's spent and surely will spend checking all the dims. If everyone's really nice to him maybe he will supply FR charts.
Peace,
Godzilla
I would like to see the FR charts too. I can't get mathcad to work on my pc... Whatever i'm supplied with i will find a way to put it onto the webpage.
Big thanks to Scott for the time he's spent and surely will spend checking all the dims. If everyone's really nice to him maybe he will supply FR charts.
Peace,
Godzilla
Greets!
The former is loading the corner, which is an 1/8th space 90 deg conical expansion, over its entire BW and the latter's loading is frequency dependent due to being somewhat further from the apex. The apex loading has the additional benefit of compression loading the vent's output, a big plus with low Xmax drivers.
GM
The former is loading the corner, which is an 1/8th space 90 deg conical expansion, over its entire BW and the latter's loading is frequency dependent due to being somewhat further from the apex. The apex loading has the additional benefit of compression loading the vent's output, a big plus with low Xmax drivers.
GM
pjanda1 said:
You're welcome!
When I was building, I made my test cabs from large scraps and used concrete formers scrounged at building sites. If you buy, it just needs to not easily strip out since you need tight joints without gluing or caulking, so 23/32" sheathing suffices. Or use thinner wood/fewer screws and wrap it with Saran Wrap to get a good seal.
The finished product must be no-void or you run the risk of having one or more spurious resonances you can't locate without a mechanic's stethoscope.
GM
Hi Terry -good to see you & hope you approve!
I haven't put the MathCad simulations up because as they stand, they're not particularly accurate representations of these cabinets in-room behaviour. The currently available sheets on Martin's site give a great 1/2 space simulation of their behaviour, but this is not an accurate in-room representation of their response, because they are designed for 1/4 or 1/8 space (rear wall or corner) loading, which flattens their response curve and increases their LF extension into the room, as Martin and Greg point out. In a 1/2 space simulation, they frequently look vile; in 1/4 or 1/8 space reality, they actually work very well. I'm currently working on using the lower, in-room half of Martin's new sheet to come up with a 1/4 space response simulation, and if I succeed, I'll post some curves as they will be a better representation. 1/8 space is not possible at present -that'll be for a future upgrade, but don't hold your breath; Martin's got enough on as it is without trying to add even more at this stage!
Subwoofers eh? I seem to remember someone raising that point elsewhere, though I can't remember where. I'll have a look at those Assassin (what a name!) drivers and perhaps those SEAS jobs that you use in the Bailey Terry for a start when I get a moment. Might give Nelson's El Pipe-o a run for its money. ;-)
Cheers
Scott
I haven't put the MathCad simulations up because as they stand, they're not particularly accurate representations of these cabinets in-room behaviour. The currently available sheets on Martin's site give a great 1/2 space simulation of their behaviour, but this is not an accurate in-room representation of their response, because they are designed for 1/4 or 1/8 space (rear wall or corner) loading, which flattens their response curve and increases their LF extension into the room, as Martin and Greg point out. In a 1/2 space simulation, they frequently look vile; in 1/4 or 1/8 space reality, they actually work very well. I'm currently working on using the lower, in-room half of Martin's new sheet to come up with a 1/4 space response simulation, and if I succeed, I'll post some curves as they will be a better representation. 1/8 space is not possible at present -that'll be for a future upgrade, but don't hold your breath; Martin's got enough on as it is without trying to add even more at this stage!
Subwoofers eh? I seem to remember someone raising that point elsewhere, though I can't remember where. I'll have a look at those Assassin (what a name!) drivers and perhaps those SEAS jobs that you use in the Bailey Terry for a start when I get a moment. Might give Nelson's El Pipe-o a run for its money. ;-)
Cheers
Scott
>>> Hi Terry -good to see you & hope you approve!
If Terry doesn't approve the page goes away.
Peace,
Godzilla
http://www.zillaspeak.com/bib.asp
BTW, subwoofer BIBs turn me on... boring boxes begone!
If Terry doesn't approve the page goes away.
Peace,
Godzilla
http://www.zillaspeak.com/bib.asp
BTW, subwoofer BIBs turn me on... boring boxes begone!
Scottmoose said:
Awesome if the 1/4 space sims work out, but even if they don't I still think they would be valuable. If all the plots are equally inaccurate for the same reason, wouldn't they still be useful to compare the different drivers/dims to each other?
'Zilla could add the paragraph you wrote above to the page as a disclaimer, so as to not frighten off future builders.