Stereo Integrity's new HT Subwoofer - Page 53

I don't recall any perspective shots of the SI 15's vs the 18's.

If reverse mounting I would opt for the 15 because of the prettier basket.

I swear the 15 weighed as much as the 18 just handling each one.

Yeah man... I thought the same exact thing. There is a slight difference, but the 15 being more compact, it feels damn near the same.

I'm going to try to finish up a few things this weekend, pop the 15's in the box I built and invite Mike and his SubM over for some testing...

Not in a huge hurry, so maybe within the next few weeks or so.

It definitely isn't not bad, unless you aren't not doing anything, then I suppose you shouldn't not build stuff.

Looks very good. Is that your mic falling off at 10hz?

Looks identical to where my mic falls off too. I now have the UMM-6 from CSL that does the EXACT same thing as my omnimic....

The CSL mic is dropping off at 10hz to?

Did you put the correction factors into REW?

Yep


And yep. I am still at a loss here, but only other things to rule out is laptop incapability, or the 3.5mm to RCA cable I am using, sound card, or my system just can't get below 10hz. With 8 subs, that still should not be the problem though...Just saying. I will have the calibrated OM mic back sometime this week I think, so I will measure that too. If three mics, two different systems, amongst other things all show the exact same stuff, then I guess I am missing something pretty serious somewhere.

Funny (interesting more like it) to read about your measurements with different systems, mics, etc because it took me about six months of EQ'ing using the XTZ analyzer to notice a pattern. Every single system regardless of whether it was in a home, car, or outside, had the same tiny rise at a certain frequency. It's been too long now so I don't remember what frequency it was. At the time I tried EQ'ing out that tiny bump but it left everything sounding a little dull. Come to find out it's apparently a sensitive spot in the mic because I used a different setup and the tiny hump wasn't there at all.

Back OT, that's a very good response curve. Solid output down to 10 Hz is impressive!

And yes, the size of the woofer does impact your perception of weight. I have two prototype 12's for Obsidian Audio in my office that weigh about 60lbs each and they feel a lot heavier than an 18" Nightshade v3 that weighs 70+lbs. Everyone that tires to pick up the 12" usually has to try twice because it's heavier than it looks. Maybe we all just expect big woofers to weigh a lot so we're ready for it when we pick them up. IIRC there is less than a 5 lb difference between the 15" and 18" but it doesn't feel like it when you pick them up.

Thanks man!!! Yea I know the capability of the marantz now, (Flat to 10hz) but I am going to run a loopback through the preout to see what it is doing, and possibly try out running my own correction file after doing this. IF I measure the same response there, then that will pretty much explain it, otherwise I guess I will be going back to the drawing board :/

When does the cost increase begin? Will the cost go up on these 3/1?

Which is total malarky, if that is the case. I wouldn't have wasted my money on another mic that still doesn't get me below 10hz. OmniMic did that for me just fine, and was easier to setup. Aren't you using the calibrated UMM-6 too?

Beast,
Answer your PMs.

Done

I want to build a small sealed with the SI-15. When I say small, I mean around 2.25cu.ft. I know the box size is inefficient, and I am losing some output if I limit it to the rated 600w. I also saw Ricci's comment on data-bass that said the 600w rms rating is primarily due to the soft suspension and not to exceed it, but in a smaller enclosure you may be able to get a little higher. Well, with 2.25 cubes, winisd shows that it won't reach xmax until around 1000w. So I am curious if anyone knows if it can actually handle that type of load. Has anyone exceeded 600w with their driver?

yes, I am running 1,100 watts per driver everyday, but my boxes are also smaller than the full recommended size. This is how it works, you go smaller with the box, you have to go larger with the power, up to the point that you still don't give the driver enough power to cook it though. 1,000 watts in a smaller box will be just fine though

That's exactly what I wanted to know, thanks.

Got my two 18D4 drivers in today after 5 weeks of waiting! (1 week for FedEx, 4 weeks for the Military Postal Service)



However, one of them looks like this...



Is this a problem?

The other driver has the dustcap sealed all the way around, This one, however, has this gap as shown.

Also, how is everybody mounting these? With the provided gasket, or without the provided gasket, using gasketing tape instead?
Edited by DanLW - 3/5/13 at 12:58pm

Same question..also what wood screws (assuming birch plywood)?

I'm going to use machine screws and hurricane nuts, and I'm using MDF. I plan to take a small block of MDF, notch out a circle just deep enough for the nut, and glue it down atop the nut so that the nut will stay in place forever (in theory). As far as screw size, I was able to get an 8mm bit through the hole. That's approximately 5/16".

#10 wood screws that are Phillips head, fully threaded, and pan head would be best, but are hard to find.

Parts express sells these in #8. http://www.parts-express.com/pe/showdetl.cfm?partnumber=293-685
and these are cheaper
http://www.parts-express.com/pe/showdetl.cfm?partnumber=081-425


I wouldn't do this. Just put super glue on the outside of the barrel and torque them in. No need to go bigger than 1/4" for machine screws.

Welp, got my calibrated omnimic back, and did some messing around last night. Bottom line, drop off is still at the same spot. Boooooo. I Ended up putting a 12dB/oct LP eq filter on each channel at 20hz to attempt to boost the low end, and I got it to bring up the low-end about 5dB but it took 12dB boost on each channel to get it. #notbuyingit.

Interdasting.

Must be electrical rolloff within the signal chain and/or measurement related. Definitely not a lack of displacement.

I think it is my laptop, as the rolloff on the chain should not be the issue as others have posted better <10hz performance from the same exact gear, but I am getting a new laptop pretty soon and can confirm that it is more than likely my 10 year old soundcard

Hummm...

Did your room exhibit the same dip with the XXX's?

The RE's the tubatrons, the SI's, the f-20's (obviously), they have all dropped off at the exact same spot and below, hasn't come back. It wouldn't appear to be a null as it is just a drop. I watched FOTP and WOTW last night after the boost was applied and I can clearly say that there is significant output below what my graph is "saying" So basically, I am happy, I would just love to have measurements that confirm what I am hearing!! Beggars can't be choosers...

What is the signal chain setup for you when you measure?

For me it's OmniMic via usb --> Asus G73 laptop --> HDMI out to HDMI in on Onkyo TXNR3007.

I obviously see a rolloff that looks similar but mine is alignment induced and I'm convinced that it will look flatter and more extended once I've gone fully sealed. ...hopefully with no hurtin' brought in below 10hz from a DCX/inuke combo.

Agreed. I think you're fine but it would be nice to know for sure, right? I mean, what good are measurements that aren't accurate?
Edited by Scott Simonian - 3/8/13 at 4:08pm