First build - Octo SI 18's with flat packs. - Page 3

Ha, I haven't seen that show but this made me laugh anyway.

Yeah, I've figured that out using the MBM-12. Hmmm... I suppose I could put a couple of SI subs behind my loveseat, I'll try that out too. I'm starting to understand why Austin has 16 subs!! Let's see, I could go 4 stacked in each front corner, 4 under the screen, 2 under the right side surround speaker 2 under the left surround speaker, 2 behind the love seat, maybe 1 or 2 in the back corner by the computer. Ok, that means I need.... 16-18 subs!!

Obviously kidding, I won't buy anymore until I experiment a LOT and I'm sure I'll be fine with 8.

Thanks edogg - I have to say I'm starting to enjoy the DIY thing. With the help of a friend I built 2 more boxes last night and we plan on doing 2 or 3 more tonight.

Wow, very cool. I did not know this! That makes so much sense but I either have never read that or I did and didn't understand - which is quite possible.

My room is 17' 3" wide, 23' deep, 7' 8" tall with half a staircase in the back.

So since a 50hz wave length is 22 feet long, does that mean the subs will act like they are co-located (assuming the distance/delay settings are correct) from 50hz down? I know it probably won't be an exact hz number, just wondering what the ballpark will be.

I have a much closer shot on my computer at home, I'll post that later.

Thanks, that sounds like something I need to catch up on this summer when it's nothing but free time. I have friends that have made similar comments about the show.

Cool, good idea I'll try this configuration for sure too. Thanks for the link. So, if I have them in the above configuration I still have 4 subs left. Does Geddes say that adding subs in other places other than the 3 will cause a negative effect? I need to do some reading but don't have time right now.

I don't know if a single SI has 75 percent of a Submersive. They are supposed to be almost identical to the Dayton HO 18's and a dual opposed Dayton had more output that a single Submersive when we compared them in my room, but it was close - very close.

Yeah, but remember we ran that scene and others at master volume -5 and the sub anywhere from 10 to 15 hot when we were recording the max output with the omnimic. We kept turning up the volume and runing scenes over and over until the db readings stopped going up and they were almost identical for every scene with a slight edge to the Dayton's.

No, we did the first part but took it out mid way through which was when we found there was a 6 or so db difference in max spl between having the sms-1 in and not having it in. I have our max numbers saved in excel at home, there was a drastic difference with taking out the sms-1. A couple days later I did more testing to make sure, and got the same result.

Remember, all our back and forth comparisons between the 2 subs, the max numbers were almost equal with all the scenes between the them. It wasn't until the beach scene of the x men movie that the difference in output became more clear, and even then the max spl number was very close between the 2.

I have. I did a ton of going back and forth between the Submersive and the SI. I do think the Submersive has more extension in the bass between 100-200hz. I tried some songs using a 150hz crossover and the Submersive handled that better. The thing is, I never use a crossover that high anymore so that is irrelevant. If I still had my eD speakers this would have mattered because a lot of music sounded better with this high crossover back when I had dual Submersives.

I've never been a believer in break in, but I have to say at first I was a little worried. When I first started going back and forth I felt like the Submersive had a bit more precision and definition to the notes over the SI. As time went on however, that perception started to change until eventually I felt like the SI sounded every bit as good as the Submersive but with a bit more "weight" to it (which I really like btw), similar to how I described the sound of the Dayton drivers back when I was comparing them to the Submersive. So who knows, could have been break in, my brain/ears breaking in, placebo, etc. but at any rate I love how the SI sounds.

Since I have one sub hooked up to the Cerwin Vega CV 5000 amp I'm not pushing things at all. The only movie scene I watched was the Iron Man 2 scene a number of times at 15 under reference. Going back and forth I couldn't tell the difference between the SI and the Submersive at this level on this scene.

Sometime I would like to do a head to head comparison of the Dayton and the SI.

Just a single. Currently I have 2 more boxes finished (no sanding or painting yet) and have the bracing done on the remaining 5.

The scene was the opening ACDC Shoot To Thrill scene. I don't want to push it yet, I'm pushing quite a bit more than the recommended 600 watts until I get some more subs hooked up to the amp. I know I could go louder with a single SI driver than -15, but I don't want to take any chances.

My thinking right now is unless you need to use a higher crossover than 100hz you can't do any better than the SI's. Now, I haven't heard a lot of subs out there, but here are some of the nicer subs I have ever heard:

Submersive duals **
Cap Ported duals **
Cap Sealed duals
Cap 2 Sealed duals
Orbit Shifter duals *
SVS Ultra duals
HSU VTF-15 duals *
Epik Empire
Dayton HO 18" dual opposed*
Stereo Integrity 18" **

* means I have heard them in my room, ** means I owned or own them. With the Orbit Shifter and VTF 15 I heard them on separate occasions, in my own room I just heard singles.