Mj-18

[k12ug 10+ year member]

im going to make a box for 4 of these...

i was wondering if the recommended space for the subs is accurate...and if it was smaller/bigger what effect would it have on the sub.

and is there a space between the magnet and end of the box, were it is to close or to far from the wood?

if the ^2 with driver displacement shown in the description?

its going to be sealed btw.

Power Handling: 600 watts RMS

Sensitivity: 93.4db (2.83 volts)

Impedance: 4 or 8 Ohms (SVC)

Outside Diameter: 46cm (18 1/8")

Mounting Diameter: 41.9cm (16 1/2"")

Depth: 20.3cm (8")T/S Parameters - MJ-18 - 8 / 4 Ohms

Fs = 30.4 / 28 Hz

Re = 7.2 / 3.2 Ohms

Qes = 0.39 / 0.34

Qms = 3.41 / 4.99

Qts = 0.35 / 0.31

Mms = 219 / 229 grams

Rms = 12.3 / 8.1 kg/s

Cms = 0.100 / 0.14 mm/N

VAS = 243.8 / 208.4 litres

Sd = 1029.2 cm2

Xmax = 12 mm

Cone Diameter = 36.20 cm

Recommended Box Sizes:

Sealed: 80 litres (2.8 cu. ft.)

Click to read more...

 

[mrray13 10+ year member]

quick thought...

click here. it's mach5 offical online forum

not only will most of your questions get answered, they'll also be answered by the man himself behind mach5.

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee //content.invisioncic.com/y282845/emoticons/peace.gif.2db28b618ed8d1964ebbe2f5021d2c39.gif

 

[k12ug 10+ year member]

3.5x3.5x1 sound about right for the enclosure?

the subs are going to be 2x2 (subs) square

or i could make the box 1x4 (subs) row

any advice?

 

[jeremiah 10+ year member]

the subs like 3cu.ft sealed

 

[jeremiah 10+ year member]

I think?

 

[neonrt 10+ year member]

4 mj 18's? //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif sealed, anything around 3cf will do. 2 of those hit 146.? sealed.

4 would be insane to say the least. but yeah, check out the mach 5 forum. not as fast paced as here, but a good site none the less.

 

[mrogowski 5,000+ posts]

Yup, you'll move some air...

Denim liked a slightly larger box for the MJ, but if you go with ~3cubes and add stuffing you should be fine. If you can spare, go 3.5 cubes for each to get that added volume.

No single driver in the $400 price range would equal what you would produce with that...

Best,

Mark

 

[jeremiah 10+ year member]

can you do 16cu.ft if so port it //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[mike dressure 10+ year member]

they are great sub's! mach 5 is awesome. i have a mj 18 for sale actually lol

 

[jmanpc 5,000+ posts]

If I've gotta build that, you're coming up to Jacksonville //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[k12ug 10+ year member]

If I've gotta build that, you're coming up to Jacksonville //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

lol....not for awhile....

but ill talk to you about it in the future....ill bring the subs so you can hear it //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[denim 5,000+ posts]

Yes, the MJ-18 does well in a 3.0 cube sealed. But with my install and my truck, I felt 3.2 would be a little better. The pricing is unreal on this sub, so much that Mach5 is losing money on it. If the price does not go up some in the future, the MJ could get phased out. There is another 18 on the way, but of different intentions, more so for large box installs with high excursion, the MJ might favor car installs more than the upcomming driver, but that is yet to be determined.