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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 #4
Marty subs work very well with the IXL. I'd probably build one of them.
Would you think the marty cube would be too small?
As the VBSS is a little larger but not quite the size of the MiniMarty.

Thanks!
 

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I would do two sealed boxes. You have a small room so the room gain in the low frequencies should be very good, you won't have to boost the low end much, if any. Also, since your priority is music and you're not going to push them too much (reference level), two 18" sealed subs should me more than enough for your needs.
 

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Would you think the marty cube would be too small?
As the VBSS is a little larger but not quite the size of the MiniMarty.

Thanks!
I had 2 x IXL's in Marty cubes a few years ago. They performed great.
 

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Would you think the marty cube would be too small?
As the VBSS is a little larger but not quite the size of the MiniMarty.

Thanks!
The VBSS size box will be significantly better (2.5-3dB around tune) between the additional native output around tune and the bigger box supporting a larger port for the same 20Hz tune you are targeting.
 

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Discussion Starter #9
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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Discussion Starter #10
Just finished building these! Man what a difference from two general 6-8" store bought subs!

Super happy with the results!
Thanks for all the advice!

Just wondering for using DSP, it seems like most people look at the combined frequency response of both the subs and then apply one filter to both subs. But would that not effectively double whatever alterations the EQ is calling for (as it will be applied to both subs)? Would it not make more sense to apply individual filters to individual subs to get each sub as flat as possible (with the goal of both then combined being flat)?
 

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Just wondering for using DSP, it seems like most people look at the combined frequency response of both the subs and then apply one filter to both subs. But would that not effectively double whatever alterations the EQ is calling for (as it will be applied to both subs)? Would it not make more sense to apply individual filters to individual subs to get each sub as flat as possible (with the goal of both then combined being flat)?
The general idea behind applying the same filters to both subs and EQing the combined response together is that both subs have equal headroom at each frequency, so you aren't running into situations where one sub is running out of headroom while the other still has more to give.
 

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Discussion Starter #12
The general idea behind applying the same filters to both subs and EQing the combined response together is that both subs have equal headroom at each frequency, so you aren't running into situations where one sub is running out of headroom while the other still has more to give.
Ok, yeah that makes sense. I tried it with independent filters and then with the combined ones and the end result was pretty much the same, so yeah easier to do one generic filter than both.
Thanks!
 
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