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Discussion Starter #1
Hello,

I got a good deal on 2 Mach5 IXL-18 with a Behringer NX6000D amp and I am keen to build my first DIY sub box (I have moderate wood working ability, and live in Canada, so buying flat packs will not be a great option).

But I am wondering what I should build.

For background info:
Use will be 75% music, 25% HT
Room is ~ 16ft x 10ft
The way the room is laid out, one sub will most likely go right behind the main listening position and one directly in front / center.

Priorities for me would be (in order):
#1 Accuracy and musicality, so I was looking into a sealed box. But then I was playing with WinISD and noted that I may not be able to get as deep as I would like without extreme DSP (which I am ok with) but also extreme cone excursion (which I don't want to blow these subs).

#2 Low extension, the lower the better (although this is my first proper sub, so we shall see how addicting that low end really is), so then I was maybe thinking about a large EBS build. Would a full or mini marty be a good fit?

Thankfully space will not be an issue, so really any box size I would make work.
Also, I typically listen below reference, so will not need them to hit crazy high levels.
I just want it clean and then deep.

Super keen for any recommendations.
Also, since this is my first build, if there are any recommended sites for designs (mostly if ported is the way to go) that would be great!

Sub specs if that helps:
Mach5 IXL-18
T/S Parameters
Fs = 17.7 Hz
Re = 3.4 Ohms
Qes = 0.39
Qms = 5.59
Qts = 0.37
Mms = 434.3 grams
Rms = 8.69 kg/s
Cms = 0.184 mm/N
VAS = 274.1 litres
Sd = 1029.2 cm2
Xmax = 22 mm
Cone Diameter = 36.2 cm
Le = 6.09 mH
Bl = 20.51 Tm
Power Handling: 800 Watts SPL (2.83v/1m): 89.2 db
Ported: 200 litres (7 cu.ft.) 19hz tuning
EBS: 365 litres (12.88 cu.ft.) 15hz tuning

Thanks!
 

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Discussion Starter #2
Looking into it more, I am wondering if I should:

A) Make a Martycube as it is 4.75 c.f., tuning = 20hz and then I could block the ports to effectively get a sealed 4.75cf sub (Which is super close to the recommended sealed size of 5cf by the manufacturer) - which gives a Qtc of 0.65

B) Make The V.B.S.S. as it would fit nicely in my room, be 6.25cf and tuned to 20hz. I just don't know if it would be a good idea to use this design if I am going from ported to plugging the ports as that would give a Qtc of 0.6
Is that enough of a difference of the Qtc (0.65 vs 0.6) that I should avoid this design compared to the Marty cube if I am thinking of occasionally plugging the ports?

Thoughts?
 

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Discussion Starter #3
Ok, I was almost starting to suffer analysis paralysis, so my wife ended up making the decision that the VBSS would be better as it would have more placement options in our room and I could also get the to fit on one sheet of MDF each.

Anyways, we are using a port tune to 20hz yet can port plug to 15hz and to a sealed configuration.

Man I am excited to get these things up and running!

Any suggestions for wiring guides for the NX6000D and subs?
Thanks again for all the input!
 

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Check out the Devastator thread on avsforum.com. RedFive is constantly designing different versions from 12" to 21" subs. They are musical BP6's with low tuning for HT.
 

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Discussion Starter #5
Just finished building the VBSS boxes and fired these up and supper happy! Man what a difference from two general 6-8" store bought subs!

Super happy with the results!
 
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