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ported 1260w X4 build

post #1 of 61
Thread Starter 
I will now be adding 2 more 1260w to my room. I am switching from the lt200 amps and will run all 4 boxes off of a epx2000. I will try to post progress for those interested in a very affordable diy build. Should be just over $450.00 invested after all is said and done.

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If I could please ask what do you guys think of these charts? Do you think they look accurate? For some reason I cannot get the sensitivity to fill in as the 93 the infinity chat says. It only will come up as 86.47.. I would be running the bigger boxes in the front of my room and the small in the back. Wa h bow will be powered by a lt200. 200w rms. 4 boxes total in my 14-22.5-8 room. I would love to hear how you all feel about this and how the smaller boxes would do with the fronts. Thanks for all the [ IMG]http://www.avsforum.com/content/type/61/id/135437/width/200/height/400[/IMG]help.
Edited by SULLY12 - 12/17/13 at 8:00am
post #2 of 61
Thread Starter 
EacMG][/IMG]
Edited by SULLY12 - 1/21/14 at 10:32pm
post #3 of 61
Haven't run the numbers, and only glanced at datasheet, so take following with grain of salt. Though I've run plenty of similar sims.

Just looking at their 31Hz(ish) vented graphs vs. yours, thinking you might not have enough linear excursion to quite make the low-end SPL. Not necessarily end of the world, though, as it might just mean some quiet compression, so long as mechanical stops aren't hit.

Can say with some certainty you won't get the 93dB/2.83V sensitivity number anywhere if tuning like you propose to. They get it only with a 31Hz vent combined with a 44Hz box tuning. Pretty close tunings compared to what you're trying to do, so port and driver are summing for a relatively peaky, sensitive response. Away from the low port tuning, yours is more like large sealed. If you look at their smaller sealed, it's 90dB, but then it's a high-Q tuning, so the peaky response gives higher sensitivity. 86dB/2.83V is about ballpark, maybe optimistic at that, for a 4ohm 12" at LF without resonant assistance. Physics...
post #4 of 61
The Infinity 93db spec is likely based on cabin gain in a car, it is an 86db driver like its specs indicate it should be. Either one of those cabinets will work fine with 200 watts. Your models dont include a HPF, which the amp will have built in (not sure what the frequency of that is, usually 20hz), but the larger cab will not have the peak at the bottom of its response. The best thing I could see about building a larger cabinet is using larger ports then you need now, and leaving open the future option of swapping in a 15" driver and a more powerful amp
post #5 of 61
There is little to be gained by going over 4 cu ft with this driver. I would make all 4 boxes the 4 cu ft design.

Does that amp you are using have a build in HPF and do you know what frequency?
post #6 of 61
Thread Starter 
Thanks. I would have to do a little digging but I believe it a 12 db at 18. Not sure if that's correct. That is why I can't tune much lower but was thinking in the 18 range and then with some room gain I might get a little lower. Also the port or ports would get too long for the box. But I think I will prob do slot ports if that will help. Like I was saying my room picks up quite abit below 25hz now with just the a2300. My out put I stronger at 18 than it is at around 25. Thanks for the help.
post #7 of 61
Thread Starter 
So my next question. I Like my down fireing sub. So I was going to go that way with these unless you all think I would benefit from front fire. Thanks
post #8 of 61
Quote:
Originally Posted by SULLY12 View Post

So my next question. I Like my down fireing sub. So I was going to go that way with these unless you all think I would benefit from front fire. Thanks

I think most would agree it doesn't matter if you front or down fire, just make sure you leave clearance for the surround, etc.
post #9 of 61
Thread Starter 



Well I am going to order 2 of these 1260w on Monday. I really wanted to have all 4 boxes tuned the same but the demisions the rears will have to be won't allow for the longer port. I am now thinking a single 4 inch faired for each box. The flow gets kinda high but after I add the hpf it seems to bee a lot better. So I'm thinking about all at 4 cube. But the fronts tuned a little lower. I am only building the fronts until I can sell my old little sub. Then I will build those. I will probably throw my a2300 in one of the back corners for now so that would give me an idea of what to expect if the back ones are tuned a little higher. Also I can't remember how much room the port needs. Any suggestions are appreciated I really want these to blow away my current sub.
post #10 of 61
I believe this driver does well in a slim 15" wide THT.....you'll be good down to 20Hz and possibly lower, but the boxes are big. Around 11cuft each.

JSS
post #11 of 61
what would the dimensions of the box be?
post #12 of 61
36"x36"x17" There is a THTLP design which would be taller, not sure on the dims for it.

Here's a build using the DVC variant of that driver (one model iteration prior to the 1260):

http://www.avsforum.com/t/1217444/tht-infinity-12-photos

JSS
post #13 of 61
Thread Starter 
.
Edited by SULLY12 - 2/10/13 at 2:20pm
post #14 of 61
Thread Starter 
That horn is too big. I can go 28-20-19 ish.
Edited by SULLY12 - 2/10/13 at 2:22pm
post #15 of 61
Quote:
Originally Posted by SULLY12 View Post

That horn is too big. I can go 28-20-19 ish.
If that's as large as you can go you won't get 20Hz from a horn. If you're going to go low and you want high sensitivity you must go big.
post #16 of 61
Thread Starter 
I never wanted to go with a horn. I am just doing a basic ported design. Between 4 to 4.5 cube tuned to 18-20hz.
Edited by SULLY12 - 2/10/13 at 6:08pm
post #17 of 61
Thread Starter 
Would anyone have an idea of how much space I should account for this driver? I was thinking around .30 for the amp and driver but that was just a guess. Thanks
post #18 of 61
Thread Starter 
Well Im not sure if anyone cares but I just got the infinty 1260w. I cant believe these only cost $53. Its pretty impressive. I hope they sound as good as they look. I will be building these this weekend and should be posting my thoughts sometime next week.

Edited by SULLY12 - 2/14/13 at 5:16pm
post #19 of 61
I'm listening to a pair of 1262w right now, for the price they can't be beaten. I'm running them 2ohm, 550w each and they're rock solid. Not a huge amount below 30hz, but I expected that in a pair of small sealed cabinets. WAF is high...
post #20 of 61
By the way, I figured 0.25 for the driver, and put mine in 1.25 cubes each. I really should post pics, but they're naked MDF right now....
post #21 of 61
Thread Starter 
One of the boxes is about half done. Sure is a big ass box.
post #22 of 61
Quote:
Originally Posted by SULLY12 View Post

One of the boxes is about half done. Sure is a big ass box.

You should know the rules by now. Pics or ban.

































biggrin.gif
post #23 of 61
Thread Starter 
Ha I know. I must admit that they are not as pretty as most on here. But they will be behind my screen wall so I'm more worried about performance than looks . I'm not going to sand them all out perfect on the outside. Just gonna throw some paint so they are not bare.
post #24 of 61
Thread Starter 
post #25 of 61
Quote:
Originally Posted by SULLY12 View Post

Would anyone have an idea of how much space I should account for this driver? I was thinking around .30 for the amp and driver but that was just a guess. Thanks

Quote:
Originally Posted by apnea View Post

By the way, I figured 0.25 for the driver, and put mine in 1.25 cubes each. I really should post pics, but they're naked MDF right now....

Most 12's (not uber-12's) are about .12 cu ft. 15's are .15. Makes it easy to remember. wink.gif
post #26 of 61
Thread Starter 
Ok so I got a little more internal volume then I thought. And they are now complete. Will be putting in the driver and amp tomorrow night.
post #27 of 61
Thread Starter 
.
Edited by SULLY12 - 2/17/13 at 10:01pm
post #28 of 61
Thread Starter 
[IMG]. .
post #29 of 61
Thread Starter 
Some pics of my diy inside port flair. And the twins before port and paint. Pretty big box for a 12. But whatever it takes for the low stuff.
post #30 of 61
Nice flare, was that the heat gun and metal bowl trick?
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