https://www.slideshare.net/slideshow/caja-acustica-de-18-sound-kit18/65765469" rel="nofollow - https://www.slideshare.net/slideshow/caja-acustica-de-18-sound-kit18/65765469

i'm wondering if i extend the baffle 68mm to the face of the cab instead of being recessed, should i keep the same port length (moving it up with the baffle)? or should i extend the port by 68mm so the port begins in the same place in the cab (but is longer)? 

i've never tried to modify a plan, and cant seem to get winisd to work, so i'm unsure how it'd effect the performance/tuning. some insight would be greatly appreciated. 

also, i'm not married to the kit18, so if theres other plans available that'd be a good/better fit for the 18lw1400 that can meet my midtops at 100/120hz, please give em a shout =D

thanks

What about this one? I think its the updated version for HP drivers 

I'm heavily considering building 4 of them. 

i’ve checked that out but like the cab shape of the kit18 and it also seems like a simpler build than this newer design. i currently have 4 of the drivers in eaw sb180’s which have very similar dimensions to the design you posted. seeking something a bit deeper for stacking purposes. 

Hi there,

The 35Hz corner is determined by the box volume, port tuning and driver TS parameters all interacting, so while adjusting box size will give you a slightly different response, it might not be all you want.

Adding 68mm cabinet depth adds ~22 litres to the internal volume, which will only make about 1dB of difference in the half-octave around tuning (yellow curve vs green in the below image. To make a full 3dB difference you would need to increase the cab to around 230l net internal, nearly 60% bigger than the original box (red curve).

The one good thing about increasing the internal volume of a cab is that the required port length for a given tuning actually decreases, so for the 167l option here you would reduce the total vent length to about 260mm - which in turn reduces the total space it takes up in the box so you'd actually end up with about 172l rather than the 167. That 5l difference would only make an extra 0.2dB difference to the response though, so I haven't bothered putting it on the graph.

HTH,

David.

thanks! this is really helpful i appreciate you taking the time. im just trying to figure out how to get better low end response without a +6db boost at 30hz. i like the idea of using a box designed for the driver but im not sure if i want to push the drivers that hard. 

maybe something like the sub18 would be better suited for the low end response im after, but i imagine that'd likely benefit from modification to be better suited for the 18lw1400?

yeah i did some more reading since posting this thread and found a few discussions mentioning how this driver sounds best in smaller boxes because of the improved dampening. and maybe this allows for it to be pushed harder safely (thinking about the +6db at 30hz in the kit18 plan which just seems wild to me lol).

oh yeah if i do build these kit18's i'd likely be doing +3db at 30hz, im balling on a budget and cant afford to replace drivers =D

right now i have 4 of the drivers in eaw sb180's (~200l volume i think) and they sound pretty dang good.

however i've been looking for 2 more sb180 cabs to house these last 2 drivers, with zero luck. so its looking like im gonna have to build some cabs if i want to use all 6 drivers. 

now im trying to figure out the best plan to run em 30-100 for dnb/jungle/dubstep (lots of heavy sub material) since it seems like the kit18 may not be ideal for this application. 

Bremen_99 wrote: the 18sub is ideal for 33-100, that's exactly why I'm considering it for my prospective build with B&C drivers. For continuity sake you could just build 2 more sb180 clone cabs, to be honest that is what I would do since you already have so many, no reason to taint the group delay or phase with a slightly differently tuned and sized cab. Definitely a better idea than building two worse mismatched kit18's. I would only build entirely new cabs for all 6 subs if you are switching to a different design, FLH or BP etc, otherwise build 2 clone sb180's. My opinion.

ive been searching far and wide for more of these cabs but no luck. 

hadn't considered diy'ing a pair though. 

In your position it would be very tempting to make two clones until recommitted to a full 6 of something new. You could try building a couple prototype cabs out of mdf and pick the one you like best.

looks pretty sick and very cool it’s designed around the 18lw1400 but it’s not a good fit for my use case. i’m doin parties for like 50-100 people so 6 reflex bins would be plenty of spl for that. and to be honest, i’ve stood in front of a few paraflex rigs (mostly hoqs type-o’s) and they’ve never really hit right, just seemed unsaturated idk 😅

probly just gonna be patient and try to find another pair of sb180s.

good looking out though ✌🏼

   To be honest the best rig I've ever heard was a very heavy large well tuned indoor reflex, low end theory at the airliner in LA.  Sounds like you are in touch with your aesthetic and crowd so keep doing what works for you.  You may have heard about these already, but  https://planssystemes.notion.site/" rel="nofollow - https://planssystemes.notion.site/ and  http://hornplans.free.fr/" rel="nofollow - http://hornplans.free.fr/ both have lots of designs, there was also a huge spreadsheet based on driver I forget where that was but could find more if you were looking for more a miniscoop or something, that driver probably sounds great in. Cheers 

man i miss those low end theory parties, what a time =]

but yeah im constantly reading through planssystemes and hornplans and old sp threads brainstorming lol. seems like aside from reflexes the best fit for these drivers for my use case would be the b&c sub18, cubo subs, or mk3 miniscoops, so if i don't find any sb180 cabs by summer im probly gonna go one of those routes.

 

i mean maybe the paraflex deal was just operator error idk but it’s 0/3 standing in front of a paraflex rig and the bassweight feeling kinda hollow for dnb/dubstep unfortunately. maybe the sound agency design is better 🤷‍♂️

you still in LA? 👀

I think paraflex takes effort to tame, it doesn't surprise me someone built it as their first rig based on specs and isn't able to run it. Crazy rising response, and I don't like only being able to use a fraction of the drivers power handling. Among other things like step response being wonky for aligning to anything else. But if they sound bad they sound bad, no measurements mean much after that.  I have some other pet theories about paraflex im harboring. Do you get to take your rig out very often in LA?  

I do little renegade parties once a month, like 25ish people with my friends and I spinning music. For that I just use 2 of the reflexes and a pair of 12+1 powered tops. 

However, I recently got access to a private property desert location though, so we're going to be going out this summer and doing little desert parties which is why I want to make use of all 6 sub drivers I have. 

Not sure how many people I could satiate with just 4x 18" reflexes outdoors. 

 I was also seriously looking at some tapped horns, it would take over twice as much wood/ply/material for something like the th1821 but less distortion, more efficient. Since you have 6 drivers might spring for something with more coupling, I've been considering building the reflex and then in the future some horn extensions (like levan, infrabass etc) let us know what you decide. I'll have to see which drivers you said you had 

yeahhh i would love to put these in some staiper mk3's both for like, sonic features/capabilities and just like, a cooler system lol. but then id need to figure out some kicks and then my simple 3 way system with ez processing is now a much more complicated 4 way system so then i lean back towards reflex lol. 

but ye i think (hope) that 6 reflexes in a pile will be healthy for ~100ppl outdoors playing dnb/jungle/dubstep. 

ye and i don’t have the transport/storage for wsx’s. 4x minis + kicks or 6 reflexes and the tops i have would be about my current capacity.