Dual Opposed Infinity Reference 1262W

Subscribed. I've been trying to come up with a reason to buy a couple of those to play with. They look like great drivers for the ridiculously low price.

What is the intended use for these?


PS - love the sig!

Lol well yeah!


Odd, I wonder what I've got messed up. I was modeling this before I posted and get a similar F10 at 22.69Hz but with 700W I'm showing only 105dB at 20hz Was the 113dB for the final product of 4 of these with 1400W? That would line up much closer (in fact it's almost exact if I use the F10 frequency of 22.69hz, 4 drivers and 1400W shows 113.393dB). Either way it's respectable I just want to make sure I don't have something majorly messed up Note, in my model the drivers are over XMax at 20hz by 3.5mm also (probably would be fine though). I pulled the parameters from this PDF linked off of the Crutchfield site, page 6:

http://a248.e.akamai.net/pix.crutchf...8/1081262W.PDF



On a side note I think I heard a pair of these in a mini van last weekend at my wife's family reunion. Her cousin's boyfriend was at our house recently when I was showing off my HT setup. I was telling him how I'd like to mess with a car sub some time to try to get maximum output at a single frequency by measuring a sealed sub then building a ported box tuned to match the car's transfer function so he was all excited to show me the subs in his van. Whatever they were they put out a lot of SPL and sounded fine but the guy totally clueless. I asked what kind of subs he had and he just said Infinity. When I mentioned 1260/1262's he gave me the blankest stare I've ever seen. He had no clue what the box was tuned to either nor did he have any grasp on what his amp settings were or what they meant lol. When he turned it on the subs were set at least 40dB hot which I mentioned didn't sound right. So he went back and messed with the amp - it got much better. I asked him what he had done and he said he turned the knobs. He said one was all the way to the left so he turned it to the right some and another was all the way to the right so he turned it left some lol. He said it sounded good now so he'd make sure nobody touched it! I knew the guy wasn't the brightest bulb but holy crap I can't imagine being so clueless about something like that which you've spent your hard earned money on

Hmm, that doesn't sound right to me . Isn't the only difference that the 1260 is single voice coil and the 1262 is dual? They both have 13mm xmax and are xmax limited at 20hz so one shouldn't be putting out more SPL than the other really (same size cone moving the same distance).

Note, I was also modeling in 4.5cuft ~ 126l

The +6dB would make sense for why we match up with 4 drivers though, that's exactly what you get doubling drivers and power

Edit, added images to show my work

Absolutely. I hope you didn't think I was trying to crap on your project - absolutely not I suspect the remaining differences in the models are due to different assumptions being made by Bassbox vs WinISD.

Bonus regarding that enclosure size, it works pretty decent for a ported alignment should you get the itch to try it out. Graphs attached tuned to 25hz (although the port length would be prohibitive if using the 6" that would be required to minimize compression/chuffing). Excursion is good down to 20hz - actually it never goes over above that either with the 700w.

"Odd, I wonder what I've got messed up."

you are on the right track. take a look at the tab marked "maximum spl" in winisd. the left side where the line is straight is where the driver is *excursion* limited. the round/flat top part that extends to the right is where the driver is *power* limited. [you must have entered the xmax and the pe for the driver or there will be no line.]

the project is decent and certainly a great bang for the buck.

the numbers however are way off. at 20hz, the system is *excursion* limited to 97db. this means no matter how much power you have or how the drivers are wired, you are out of xmax. you might eak out a couple more db past xmax.

adding a second sub and power will give +6db if the subs are co-located. that would bring you up to 103db at 20hz.

the sim in the pdf is all screwed up. the author had no idea what he was doing.

good luck with your build.

"So I don't know where you are saying I'm off."

this part: Estimates put the F10 at 20Hz at 113dB

are you sure that you have entered all the specs accurately?

i'm looking at 2 drivers excursion limited at 103db at 20hz.

"I can't get the 1262W to model correctly for some reason and it has a sensitivity of 96dB vs 91dB. so this should put it at ~104-105dB."

no. sensitivity has nothing to do with the limit of the excursion.

13mm xmax is 13mm regardless of what the sensitivity is. sensitivity is a measure of the top end performance, not the bottom end.

my apologies if i came across a little harsh in your thread. you are trying to pick this stuff up and i respect that. it's just that when some numbers get thrown around as facts others will get confused too, so best to try to eliminate errors quickly.

like i said before, yours is a great bang for the buck build.

If you have a copy of Excel, you can try out Unibox which is pretty accurate, easy to use and free. That's what I use.

If you like UniBox, you'll like this guy's code too.

http://audio.claub.net/software/jbabgy/jbagby.html

Very cool seeing realtime changes to response as you tweak box design. I especially like the ease of modeling PR designs.

Hmm, you saw the 1262W for $46 shipped?

I purchased 4 1262's from Amazon @ $46 about a week ago.

Insane deal. Thats a whole lot of displacement for $200.

They are due to arrive this Tuesday.

Any update on this build?

Has there been any updates? Final images? ;-)
I am looking into these subs as well.

Thanks!

I say go ahead and order them up. I bought 4 - 1260's and put them into a pair of sealed enclosures with 2 cubic feet per driver. I'm running them with a Crown XLS 1500 in 2ohm stereo and they are very impressive. For the money, you really can't go wrong. I'm pretty sure that I would have had to spend A LOT more money to beat this setup.

I went from a pretty small single sub to the above setup and just watching TV is impressive. It's really funny to feel how much bass is in some commercials. The looks my wife gives me are also hilarious. We listen to a lot of Pandora when we get home from work and while we're getting dinner ready. She just shakes her head, smiles and says, those things are ridiculous. Our entire house vibrates now. I never used to be able to feel bass unless I could also "hear" it, now I can actually feel the lower bass without hearing it. I'll be sitting on the couch and it will just start shaking from the bass. it's really hard to describe unless you've experienced it. So, the difference for me was out of this world.

Don't know if any of the above helps, but I really cannot say enough about these subs. Very, very impressive for the money. Especially when implemented in multiples.

Great. This is exactly what I was looking for. Would you mind explaining your connections and all? Perhaps some final pictures?
I am looking at this same setup, but am a little confused on the box/connections....

Jay: thanks for giving us your comments on how the 1262 drivers are performing. They sound impressive.

What subwoofer were you using before?

Also, I see a 2 cu ft seal box for specs, what was the size for a ported box in cu ft and what were the port sizes as well? The charts are very confusing...
I'm just curious as to the size difference of the ported / sealed. I plan to have two boxes and wonder how much more real estate the ported would consume. ;-)
This would be the double sub box. Thanks in advance.

Sure thing. I purchased 4 - 1260's in 4ohm and I put two drivers in each enclosure. The subs are wired so that they present a 2ohm load to each channel of the amp. I'm using the sub-out from my receiver, that connects to a Y adapter that then feeds both channels of the amp. As mentioned, I'm using a Crown XLS 1500 for power. It's giving about 750 watts per channel at 2ohm's. It is dead silent. I don't think that I've ever heard the fans kick on, so no fan noise issues. And I also did not get any ground loop issues, no hum. Some people have complained about both. I've had zero issues running a pro amp. I was a little worried about going pro amp but it has worked flawlessly for my application.

I ordered speakon connectors from PE and they are the best connection you could possibly make. And they were supper cheap. I needed four single pole male connectors and two single pole female connectors. This allows you to plug into the back of the pro amp and then make the same connections at the sub cabinet.

I got everything together so that I could give them a listen and get them broken in a little. I've had them up and running for about two weeks. I'm planning to yank the drivers and veneer the boxes this weekend. I'll take some before, during and after pics for the veneer process. I'm using paper backed cherry and solid cherry for all corners so that I can do a round-over and not expose any of the plywood lamination.

Some of the other members did a couple models for me and we figured out that 4cuft and 750 watts per enclosure looked about the best so that's what I did. I was doing sealed from the word go and never modeled a ported box.

I had a Mirage 8" ported sub that I bought years ago. It was a really good back in the day, and in the room that I had it in. Back in June I moved into a house with a much larger and completely open room. I really needed the extra displacement to compensate.

I built these subs with the intention of moving them to a dedicated theater room once I finish the basement. Once I have them in a room that I can seal I'm guessing these things will be pretty crazy.