thudd
Junior Member
Posts: 86
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Post by thudd on Sept 1, 2006 1:06:58 GMT -7
Hello all,
I'm looking at building an IB into a new theatre/lounge extension at home. At this early planning stage what I need to know is what drivers are available locally in Australia so I can work out some basic costs and specs. Importing a quartet or so of big, heavy 15" vacuumers from overseas will blow the cost out with huge shipping costs so local will be my best bet. There must be a few fellow Aussies on the board here who know what's out there! The only one *I* know of are the Adire drivers available from Aranmar (http://www.aranmaracoustics.com.au/, previously Acoustic Concepts) who apparently stock the old Tempests. But there must be others.
Thanks in advance
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Post by norpus on Sept 1, 2006 6:12:17 GMT -7
Hello all, I'm looking at building an IB into a new theatre/lounge extension at home. At this early planning stage what I need to know is what drivers are available locally in Australia so I can work out some basic costs and specs. Importing a quartet or so of big, heavy 15" vacuumers from overseas will blow the cost out with huge shipping costs so local will be my best bet. There must be a few fellow Aussies on the board here who know what's out there! The only one *I* know of are the Adire drivers available from Aranmar (http://www.aranmaracoustics.com.au/, previously Acoustic Concepts) who apparently stock the old Tempests. But there must be others. Thanks in advance Thudd , talk to wacko02 on dtvforums as he may be thinking of a GB for the Mach 5 and importing. If you do get the GB up, I might become interested in 4 of these for a second IB in the rear to tame room nodes...
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Post by mrogowski on Sept 1, 2006 6:54:24 GMT -7
Hi Guys,
I don't mean to hijack this thread, but if there is enough of you looking for 18" units, I can try to arrange a direct drop to an address in Australia from the OEM. This should save you money on shipping costs.
I already have a line into the OEM to see if this is possible. I probably won't hear back until sometime next week.
Mull it over...
Best, Mark
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Post by glennb on Sept 1, 2006 17:57:57 GMT -7
Thudd, I've been looking at getting some MJ-18's sent to Melbourne and have been in touch with Mark in regards to pricing. It is good value compared to getting the Adire's locally as it will be significantly cheaper to import.
The only catch is that it will likely be a long lead time.
As Norpus said, my username on DTVforum is Wacko02 and I've got a thread going there about my search for a sub. At the moment, i'm still thinking about my options.
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Post by norpus on Sept 2, 2006 8:15:05 GMT -7
Hi Guys, I don't mean to hijack this thread, but if there is enough of you looking for 18" units, I can try to arrange a direct drop to an address in Australia from the OEM. This should save you money on shipping costs. I already have a line into the OEM to see if this is possible. I probably won't hear back until sometime next week. Mull it over... Best, Mark That sounds a good idea if they are coming from Asia anyway
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Post by shanko on Sept 2, 2006 19:01:37 GMT -7
I am in New Zealand and would be interested in the possibility of going in for 4 18" drivers to be dropped in Australia (as long as someone could then on-ship to me in NZ!).
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thudd
Junior Member
Posts: 86
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Post by thudd on Sept 3, 2006 2:10:14 GMT -7
Thanks for the reply guys I'm not familiar with the MJ-18 but sitting pretty there at the top of the $ per litre chart is certainly in its favour! And at $60/unit, it's well under $100 in Australian pesos - of course there'd be costs on top of that by the time they're landed but it's in the ball park. If it comes to around that price then 4x would be a certainty and I'd even consider 8x (2 subs perhaps!). Unfortunately the sub would be installed as the room is being built so I wouldn't be able to take measurements regarding best position etc until everything is in place and completed. So I'd be whacking the outlet up the front (in the roof space) midway between the front speakers and hoping for the best. As an example of what's available locally, Jaycar (an electronics chain) offers this: www.jaycar.com.au/productView.asp?ID=CW2145&CATID=15&keywords=&SPECIAL=&form=CAT&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=383... which may or may not be suitable for IB work. As a 12" driver the Xmax might be too low perhaps. I'll need to find time to plug it into winisd to see what it does unless someone beats me to it. The benefit of course is that I can jump in my car and drive to the nearest outlet to pick them up! But a potential GB of 18" jobbies for a similar price....mmmmmm!!
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thudd
Junior Member
Posts: 86
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Post by thudd on Sept 3, 2006 2:12:59 GMT -7
Addendum: my timeframe would be, say, the next few months (< 6). The IB box could always be pre-built & wired if I knew exactly what I'd be putting in there and had a suitable template to work with and the drivers mounted later.
The new room would ideally be up by xmas/early jan. I don't know if this fits in with the proposed GB?
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Post by glennb on Sept 3, 2006 2:42:14 GMT -7
Thudd, I'm in the same position as you in regards to locating the IB as I don't have an existing sub so would just be sticking it in the floor and hoping for the best.
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Post by cowanaudio on Sept 4, 2006 15:33:37 GMT -7
G'day Thudd You should have a close look at the Jaycar Venom 15" www.jaycar.com.au/ CS-2345 I've been part of a project that used 8 of these, and the results, for the money, were nothing short of excellent. There has been a bit of confusion regarding the X-max of this driver. Earlier catalogues listed X-Max as 5mm, when it should have been 15mm. Testing these drivers shows they are very clean out to about 12.5mm. At the moment, in Australia, these offer the most displacement for the AU$. Cheers William Cowan
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Post by glennb on Sept 4, 2006 15:37:47 GMT -7
Any info on the technical details for the Jaycar drivers? Qts? Xmax = 15mm (one way?) etc, etc
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Post by lhreeves on Sept 4, 2006 15:45:28 GMT -7
SPECIFICATIONS Nominal impedance: 4 Ohms Power rating: 250WRMS Sensitivity at 1W@1m: 88.48dB Voice coil resistance (Re): 3.5 Resonant frequency (Fs): 25.65 Mechanical Q factor (Qms): 3.552 Electrical Q factor (Qms): 0.578 Total Q factor (Qts): 0.497 Equivalent volume (Vas): 150.7Lt Voice coil diameter: 65.5mm X max: 15mm Magnet diameter: 156mm Magnet height: 40mm
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Post by cowanaudio on Sept 4, 2006 15:51:55 GMT -7
The X-max is peak. The drivers are clean out to +/-12.5mm. The suspension gets a bit noisy at rated X-max. I would not want to drive them past 40mm P-P. This seems to be their mechanical limits.
Cheers
William Cowan
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Post by norpus on Sept 4, 2006 17:29:02 GMT -7
The X-max is peak. The drivers are clean out to +/-12.5mm. The suspension gets a bit noisy at rated X-max. I would not want to drive them past 40mm P-P. This seems to be their mechanical limits. Cheers William Cowan Was that 40mm P-P or 20??
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thudd
Junior Member
Posts: 86
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Post by thudd on Sept 4, 2006 18:58:51 GMT -7
Ah yes, I looked at these but I must have been looking at the old specs because I also saw the xmax of 5mm and thought "nahhhh", which was a pity because the Qts - and more importantly, the price - is spot on.
Would the power handling and efficiency of this driver be a problem for hitting those subterranean notes at useable spl or does an installation of 4 or 8 of them take those factors right out of the equation?
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Post by cowanaudio on Sept 4, 2006 19:52:20 GMT -7
G'day Thudd
Eight of these drivers will fill a pretty big room with bass. In an IB, 200W per driver seems about right and lets you use all of the 16L of displacement at 20Hz. For the money I'd think they are worth a try. If you still want more, do a second manifold, or for a MUCH larger spend, you could buy more powerful drivers overseas.
Cheers
William Cowan
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thudd
Junior Member
Posts: 86
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Post by thudd on Sept 4, 2006 20:33:29 GMT -7
"MUCH larger spend" is the thing isn't it! It'd be going into a room that's 5.7 x 3.9 x 2.7m and at the Jaycar price - approx half of the MJ-18 price which definitely a considering factor - 2 boxes of 4 drivers or 1 box of 8 is achievable.
I might drag winisd out over lunch and do some modelling.
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Post by norpus on Sept 4, 2006 22:32:51 GMT -7
Thudd FYI your room is smaller in volume than mine - and 2x18" Avalanches fill that pretty well, altho 4 would be nicer If you do go the 8 drivers, go 2 boxes of 4 (mid back and mid front) to harmanise out some room nodes for best effect. www.harman.com/wp/pdf/multsubs.pdfI guess that paper would hold for IB as much as any other sub
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Post by mrogowski on Sept 6, 2006 7:23:34 GMT -7
"MUCH larger spend" is the thing isn't it! It'd be going into a room that's 5.7 x 3.9 x 2.7m and at the Jaycar price - approx half of the MJ-18 price which definitely a considering factor - 2 boxes of 4 drivers or 1 box of 8 is achievable. I might drag winisd out over lunch and do some modelling. Interesting stuff. Given the pricing and availability, I'd go for the Jaycars. If there is any interest in getting some units drop-shipped to them, I will need to know by the end of this week. Sorry for the short notice on this... Best, Mark
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Post by glennb on Sept 6, 2006 16:12:09 GMT -7
Mark, I'm thinking of going for the Jaycar units as well but won't be ready to buy for a few weeks yet, so the GB for the MJ-18's doesn't look like it will happen.
Thanks for the heads up though.
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