cdub
New Member
Posts: 9
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Post by cdub on Aug 20, 2012 11:44:18 GMT -7
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Post by FOH on Aug 20, 2012 14:28:06 GMT -7
Are they shipping?
The price is right, the claimed stats; Xmax reasonable, Xmech great, Fs nice, they look robust for the price,..like all, time will tell.
I'd be curious how they really stack up with regard to measured verification of IB aligned-bottom octave sensitivity, Xmax and Xmech. I've got no reason to suspect they're cheating the specs, it's just that some mfrs do, so empirical evidence rules the roost.
I wish them luck, more mfrs the better.
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cdub
New Member
Posts: 9
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Post by cdub on Aug 22, 2012 11:10:08 GMT -7
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Post by ThomasW on Aug 23, 2012 6:38:40 GMT -7
This are somewhat interesting to look at but provide no useful info about the drivers
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Post by FOH on Aug 23, 2012 7:30:05 GMT -7
This are somewhat interesting to look at but provide no useful info about the drivers +1 Yeah, everything looks robust,..ie, the spider sown in leads, tall surround, motor venting, apparent excursion, magnet slugs and pole piece, most importantly, the modest price. But, some more actual useful information |
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Post by tinnears on Aug 23, 2012 11:26:23 GMT -7
I suspect the manufacturer is reluctant to be overly specific until the first drivers actually roll of the assembly line. Things always change a bit in actual production.
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cdub
New Member
Posts: 9
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Post by cdub on Oct 19, 2012 22:45:36 GMT -7
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Post by ThomasW on Oct 20, 2012 6:00:56 GMT -7
From the stereointegrity website.
When these are something other than vaporware, a decision will be made about using them in an IB
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Post by ThomasW on Jan 5, 2013 7:30:35 GMT -7
No longer vaporware, someone needs to build an IB using them so we can test them out...  |
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dar47
New Member
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Post by dar47 on Jan 5, 2013 8:48:13 GMT -7
I got 2-18's and will start this spring but I have a lot of reading to do first.
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Post by ThomasW on Jan 7, 2013 8:18:25 GMT -7
Cool, keep us informed regarding your project...  |
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Post by FOH on Jan 7, 2013 9:08:23 GMT -7
I got 2-18's and will start this spring but I have a lot of reading to do first. What are you considering? |
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dar47
New Member
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Post by dar47 on Jan 7, 2013 20:12:52 GMT -7
Hi, all I'm new to IB and have to plow through the resource material before I start any questions. I'm hoping to start a build thread this spring cause I don't have a heated shop. I have done some 20 speaker builds before and I have some measurement gear for some testing. I have a small storage area 4'x20'x8' behind the front wall in my theater area approximately 14'x35' with the main seating 18' from the front wall. The storage area should be big enough for 2-18's in a manifold, 10x vas right?. I wish I could do 2 manifolds but I will start with the 2-18's I have. I have an idea of the layout and I'll post some drawings before I start making holes. The area looks like this before I sold my speaks. I'm waiting on Jon Marsh's Ardents which will be documented after he finishes his Death Star build, so hopefully will be done this summer along with a new center and rack. s366.beta.photobucket.com/user/Darr47/media/Basement/Speaker005.jpg.html?sort=2&o=5s366.beta.photobucket.com/user/Darr47/media/Basement/Speaker004.jpg.html?sort=2&o=4s366.beta.photobucket.com/user/Darr47/media/Basement/Speaker007.jpg.html?sort=2&o=7s366.beta.photobucket.com/user/Darr47/media/Basement/Speaker006.jpg.html?sort=2&o=6The bottom component stand will be relocated for the manifold between the new towers. The corner sub a 15" Dayton in a tempest box could be built in a smaller sealed box to fill in but I'm hoping it will not be needed. A friend at work and fellow DIYer went in on the buy with me and picked up 2 18's as well and is planning on doing 1 in a sealed box till he completes his new home. He is planning on an IB for the new house though. We will do some measurements of his sealed box when he finishes it to see how it does in a sealed box. |
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Post by ThomasW on Jan 8, 2013 8:08:01 GMT -7
The storage area should be big enough for 2-18's in a manifold, 10x vas right?. Yes, that's the recommendation, it's not an absolute. It will be interesting to find out how these drivers work in an IB. |
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Post by rich20730 on Jan 15, 2013 11:27:11 GMT -7
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Post by FOH on Jan 15, 2013 16:03:13 GMT -7
Nice pics.
Any other system/room details?
Nice manifold, any more details wrt it?
Amplification, with these drivers in an IB config, I'm sure would interest many. Did you free air test them with your system signal chain, that would tell you a great deal about realistic, in use limitations and bottoming characteristics.
These drive units appear to offer up some decent specs for the money, ... that's a good thing.
Thanks for sharing.
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Post by rich20730 on Jan 16, 2013 13:43:31 GMT -7
Nice pics. Any other system/room details? Nice manifold, any more details wrt it? Amplification, with these drivers in an IB config, I'm sure would interest many. Did you free air test them with your system signal chain, that would tell you a great deal about realistic, in use limitations and bottoming characteristics. These drive units appear to offer up some decent specs for the money, ... that's a good thing. Thanks for sharing. I'm new to home theater/home audio so you'll have to bear with me if I'm not completely familiar with which details are important and what the prevailing measurement methods and software are. I don't have any experience with REW, but I have a Dayton EMM-6 measurement mic and the Audiotools iOS app with several of the add-on modules so I'm happy to take some measurements if people are interested. The room is my living room and it's 2,400 cubic feet with wood floors and no acoustic treatments of any sort. The rest of the system consists of a Denon/Boston Acoustics 5.1 HTIB (AVR-591) with some Boston Acoustics CS226 floor standers. For amplification I'm using a Behringer EP4000, which I just got yesterday. The subs are D2's and I'm running one on each channel at 4ohms, which I guess would be 950 watts per speaker. I ordered a Minidsp balanced 2x4 for processing, but I haven't received it yet. The manifold is 3/4" MDF on the outside and 3/4" birch ply on the inside. It's 24" tall and the opening is 16"x21" The manifold is mounted about a foot from the wall and is a little left of center in relation to the TV and the mains because that's as far over as my attic would permit. I ran the Audyssey MultiEQ and it set the sub low pass at 120hz with the Front HP at 150hz, Center at 110hz, surrounds at 90hz. With no changes, other than bumping the Center and surrounds to 150hz, it sounds terrific. Very smooth and natural with lots of low end and no issues with localization or sub/midbass integration. I think that having the ability to cross the other speakers much higher than before has really improved the overall sound quality. I haven't done any testing or measurements so far, but I did a quick demo with a playlist of low frequency bass songs and the subs shook the house without breaking a sweat. I have a pair of Image Dynamics Idmax 12's in my car and on a song like "Bass I Love You" the Max's have a crazy amount of excursion and start to make some suspension noise. At a similar level of output, the HT18's were barely moving and seem like they could handle much more. I'm sure I'll eventually try pushing these subs a lot harder to see what they can take. I just hope that my ears, neighbors, and household fixtures will be able to handle it. If anyone has any suggestions for specific tests or measurements they'd like to see, let me know. Just a side note on my first experience with a home theater infinite baffle setup: My wife loves all the transformers movies, and I like the first one, but I've never been able to make it through Transformers 2 without falling asleep or getting distracted. Today I sat glued to the couch grinning ear-to-ear for the whole 2 1/2 hours. Amazing!
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Post by pitviper33 on Jan 16, 2013 14:24:46 GMT -7
You made it all the way through Transformers 2? That is indeed amazing!  Seriously though, well done on the build. It looks great. Have you put a grill over the opening, or do you intend to? When I first completed my build, I felt very similar to you. I was pretty satisfied with the sound before bothering to measure. But when I eventually got around to it I realized how much room for improvement I had left. and I also discovered that relatively little effort gave me a large and noticeable portion of that benefit. You've already got the equipment, so you might as well give it a shot. It's easy enough to get started with REW. I'm not familiar with Audiotools, but it may work just as well. Either way the first things to do are to take a frequency sweep measurement nearfield and then in your primary listening positions. There's more info on that procedure in one of Thomas' guides above. Just post the output graphs and the more experienced members will be able to tell you whether you've done it right and how to interpret the results. |
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Post by rich20730 on Jan 16, 2013 15:13:28 GMT -7
Yep. Gonna paint those 2x4's white and I have some grill cloth on its way from Part Express. I took a quick measurement using 20-20k pink noise with an averaged response taken while moving the mic around the area where I usually sit. The curve looks pretty close to what I usually shoot for in my car.  I'll have to give REW a try since it seems like that's what most people use on here and I think I saw that it integrates with the MiniDSP software. So you're taking a nearfield measurement and comparing it to the measurement at the listening position to find the transfer function of the room? Before I ask a bunch of questions about that and things like pink noise vs. tone sweep, reflections, gated measurements etc. I'll go ahead and read the guide and see if it's in there |
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Post by ThomasW on Jan 17, 2013 8:22:16 GMT -7
So you're taking a nearfield measurement and comparing it to the measurement at the listening position to find the transfer function of the room? Since nearfield should be close to an anechoic sim, we use them to make sure the listening position measurements are accurate |
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