Two Infinity Reference 1240w Subwoofers for my budget room system - AVS Forum
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post #1 of 16 Old 10-13-2013, 11:19 AM - Thread Starter
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Subwoofer Tech Data:
http://narbi.free.fr/manuels/HP%20-%20SUB/Infinity/REF1240W%20Tech%20Sheet.pdf

Planning to use and iNuke1000dsp because i want best bang for the buck and i found a good price, i also plan to do the fan mod using this fan:http://www.amazon.com/Noctua-NF-R8-Raised-Blade-design-Bearing/dp/B002CQTYL6/ref=sr_1_1?s=electronics&ie=UTF8&qid=1381379249&sr=1-1&keywords=noctua+80mm

I want to be able to feel the bass it, and shake my room, do u think this is enough power? I found these subs in my dads garage so i will use them for now, but might get the Dayton 15 inch Titanic MK4 later on.

My Room is 12x11x9, there is a pretty big truss design hole near the ceiling that is almost the length of the room that leads to the rest of the house, and my ceiling is slanted (it goes from around 7-8ft to around 9-10). I mostly listen to bass heavy electronic music, and hip-hop/rap, and some other genres pretty often. I don't really care if each box is big, i just want the most output for the subs.

Is it possible to make an efficient horn enclosure for these subs? Or do i just go ported for the most output? I also want my bass as clean as possible.

WinISD Calculations using the Infinity Reference 1250w driver (because they are pretty much the same from what i have seen):

200w





300w





300w (always higher) vs 200w




So can anyone tell me:
Is this powerful enough?
Is there a better box design?
Should i just sell these subs and buy one sub?
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post #2 of 16 Old 10-14-2013, 03:14 PM - Thread Starter
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Anyone? I would like to know A.S.A.P. if this is a good enough setup for my uses... Plzzzz
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post #3 of 16 Old 10-14-2013, 03:49 PM
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just one opinion, but i think you are expecting too much out of them. 125db or so for "pound and shake the room".

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post #4 of 16 Old 10-14-2013, 04:11 PM - Thread Starter
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I think that if my subs can hit near 112+ db it would be enough, because isn't it that if you add another of the same sub you gain 3 db? so 115 db sounds like enough for a small room doesn't it? I don't have experience with room acoustics so i don't know what it would sound like. Also do you think the inuke1000dsp is enough to run sayyyyy, an SI 18D2, SI 15D2, or a Dayton 15 inch MK4 in the future? or is there not enough headroom?
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post #5 of 16 Old 10-15-2013, 01:47 PM - Thread Starter
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i think im just gonna buy when i can, cuz according to the graphs it looks good and no one is helping me... lol
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post #6 of 16 Old 10-15-2013, 05:35 PM - Thread Starter
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Will the at least be able to be felt? ANYONE
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post #7 of 16 Old 10-15-2013, 07:34 PM
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pop open that technical note in your first post.

the plot that shows the sealed cab outdoors vs. in car shows the difference of what is called "room gain" or pressure vessel gain.

cars are small, so that gain kicks in pretty high in the frequency, up around 50hz or even higher for a small car.

as a result, down around 40hz, where the big bass hits are for your kind of music, the car is providing 15db of free gain.

your actual room is much larger than a car and so that gain won't be kicking in until around 30hz. so the whole mountain of spl gets wiped out when you move from the car into the home.

in a car, it often only takes 100-200 watts to get up past 120db peaks in the 40hz bass. most folks would consider 120db+ bass hits pretty big, but others would want even more, but it is definitely enough to get pumping pretty good.

in a home, you don't have that big gain, so it almost all has to come from the subs, which means more subs and more power or more sophisticated designs.

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post #8 of 16 Old 10-15-2013, 07:47 PM
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here is that driver in a sealed enclosure of 2.5 cubic feet with 500 watts and the same driver in a ported enclosure of 4 cubic feet tuned to 28hz with 3 round ports that are 24" long also with 500 watts. slightly underdamped for maximum bass (i.e. a slightly peaked response). excursion gets overshot by a little, but that should be ok. this is about as good as you can do in a simple build with that driver. bridged mode on an inuke 1000dsp would be about 600 watts or so, so don't go quite full out. a better amp would be the inuke 3000dsp and run this sub on one channel and have the other channel free for another sub. once you get a taste, you will want more.


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post #9 of 16 Old 10-15-2013, 07:51 PM
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here are the thiele small parameters in winisd.

enter the green values only, hit tab and let winisd calculate all the values in blue.


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post #10 of 16 Old 10-15-2013, 07:56 PM
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edit: i see that you have two drivers. since that is the case, grab the inuke 3000dsp. parallel the drivers for 2 ohms and run them off of one channel. that will give you about 550 watts per driver and still have the second channel open for another driver.

with two drivers and a total of 1100 watts, you will have almost 6db more than what i show in the plot above! you'll be up in the 120db+ max spl ballpark and that is getting some shaking going on!

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post #11 of 16 Old 10-15-2013, 07:59 PM
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if you choose to get something later on, a second set of infinity 1260's are only another $130 and could be wired in parallel for 2 ohms on the second channel for another 1100 watts or so and another 6db gain!

http://www.amazon.com/Infinity-Reference-1260w-1200-watt-High-Performance/dp/B0028AVGEO

the 1260's model exactly the same (i just checked as the 1240's), so the cabs and the response would be the same.

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post #12 of 16 Old 10-16-2013, 03:28 PM - Thread Starter
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I know for sure i will want more later on... but im not sure if i can go for the inuke3000dsp (but i would love too). I found the inuke3000dsp for 280, and the inuke1000dsp for 190.... on ebay. The inuke3000dsp is soooo tempting, but i don't have speakers, a speaker amp, or wires..... This is gonna be for a computer set up in my room, but i realize that the inuke3000dsp would be better cuz i can use it until it eventually stops working, and it can power almost any sub i throw at it. Would you happen to know if inukes are pretty durable? (as in lasting a long time, not taking hits)
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post #13 of 16 Old 10-16-2013, 03:33 PM
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there are literally thousands of them deployed in the pro audio industry at this point and I have not heard of any widespread issues.

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post #14 of 16 Old 10-16-2013, 03:39 PM - Thread Starter
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wow u respond fast, maybe i can get the inuke3000dsp, also how powerful would my speakers have to be to keep up with the subs? Would bookshelves be good enough? or will i have to with floor standers? Another thing, do you think buying a bookshelf like the pioneer bs22 would be more bang for the buck than buying a full range driver and making a box for it? maybe even a cheapy diy 2 way bookshelf?
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post #15 of 16 Old 10-16-2013, 03:55 PM
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obviously you will need main speakers to keep up, but for the bump'n bass that you mention, there is about 10-15db more spl in the bass than in the mains, so the system can be out of balance and still work.

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post #16 of 16 Old 10-16-2013, 04:04 PM - Thread Starter
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yea... anyways atleast i dont mind bass smile.gif i prefer it waaaayyyy over very high pitched squeeking tweeters... How many watts do u think i should go for for the bookshelves? 10-50w? I would like to get the topping tp30 and match them up with the pioneers (i also need a dac cuz im using my laptop). Since u seem to know a lot, and when i searched it up it seemed to be true, but are rear channel bookshelf speakers the same as fronts? I found some cheapo klh audio rears (they have a woofer and tweeter) in my house and i might use that until i can buy better speakers, but i don't even know what they sound like.... My family doesn't really like to spend money on speakers, and amps etc....
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Subwoofers , Infinity , Behringer Nu3000 Inuke Ultra Lightweight High Density 3000 Watt Power Amplifier , Behringer Nu1000dsp Inuke Power Amplifier , Behringer Nu4 6000 Inuke 1400 Watt Power Amplifier
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