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Stereo Integrity's new HT Subwoofer - Page 41

post #1201 of 1716
1/24/13 at 4:29pm
Quote:
Originally Posted by mtg90 View Post



The high speed is always so cool biggrin.gif


WOW...that's amazing.

My subs never do anything like that. Is there an MP3 track or something that can get my subs to move that way?
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post #1202 of 1716
1/24/13 at 4:39pm
A 15hz sine will do the trick. Free air helps.
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post #1203 of 1716
1/24/13 at 4:45pm
Quote:
Originally Posted by Scott Simonian View Post

A 15hz sine will do the trick. Free air helps.


Where do I download a 15hz sine wave? Youtube?
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post #1204 of 1716
1/24/13 at 5:19pm
Quote:
Originally Posted by smokarz View Post

Where do I download a 15hz sine wave? Youtube?

or look at the bass mechanik tracks on itunes. OR just download the audio test DVD that is a sticky biggrin.gif

On another note, still waiting on my binding posts so I managed to get something going here with the "temporary" boxes, still don't look to shabby, minus the bare wire sticking out the side, not using any speaker terminals biggrin.gif

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post #1205 of 1716
1/24/13 at 5:35pm
Quote:
Originally Posted by mtg90 View Post

The high speed is always so cool biggrin.gif

So, I bought the same Canon S100 that you use, but for some reason every video I took was abnormally dark?

I retuned it and plan to scoop up another high speed camera in the near future. Awesome video man, nice to see these SI's can dimple with the best of em...
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post #1206 of 1716
1/24/13 at 5:36pm
SO. Put two on each channel of the epx4000 that would give them each 550 watts in a "smallish" enclosure or run them all four off once channel of the LG 14k? That wiring to get them to 4 ohms scares me, haha!! much easier the other way....
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post #1207 of 1716
1/24/13 at 5:46pm
Did I hear ssa. That's my brand xcon most amazing drive I ever heard for output and sound
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post #1208 of 1716
1/24/13 at 5:55pm
that's "YOUR" brand? As in you own the Co? I like the SSA stuff, for car audio, never tested it for HT really, but I still imagine it would be pretty potent and usable. I good woofer for sure smile.gif
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post #1209 of 1716
1/24/13 at 6:46pm
Quote:
Originally Posted by Ricci View Post

In that specific case it was BL. eek.gif Try changing the BL +/- 15% and see what happens to the rest of the parameters. Again that's totally disregarding the suspension and MMS variations. Turns out that the particular driver that started that conversation apparently had a motor not fully charged because the next one was what I consider to be dead on.

If I run tests on a driver back to back they will be slightly different every time. Now if I do it 2 weeks apart they will be a much larger variation for the same exact driver. All I can say is that is what I measured from the proto driver on that day. I trust the Klippel results for that driver on that day as well. If you absolutely have to know to the nth degree you will have to measure your own drivers and go from there. Sealed enclosures are very forgiving amd it's not worth troubling yourself over. Vented is a little more finicky but it's not like the design will be trashed by some variations even large ones. Not to mention all of those small signal parameters go out the window anyway once real power is applied and excursion gets high.

thank you. all i could see is that the models look very different in winisd. but with the little experience i have i could not tell how unusual or typical this is.
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post #1210 of 1716
1/24/13 at 9:06pm
Quote:
Originally Posted by dictator92 View Post

Did I hear ssa. That's my brand xcon most amazing drive I ever heard for output and sound

But you're not biased or anything. cool.gif
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post #1211 of 1716
1/24/13 at 10:30pm
Quote:
Originally Posted by smokarz View Post

Where do I download a 15hz sine wave? Youtube?

Both REW and WinISD have signal generators you could use, REW having more options.

Quote:
Originally Posted by popalock View Post

So, I bought the same Canon S100 that you use, but for some reason every video I took was abnormally dark?

I retuned it and plan to scoop up another high speed camera in the near future. Awesome video man, nice to see these SI's can dimple with the best of em...

Since the shutter is opening and closing much quicker you need a lot of light to capture video in high speed. At 240 FPS you need 8 times more light then then minimum you need for regular 30 fps video.

I should note that I was unable to push the driver to its limits as I was power limited, though it was starting to make some decent suspension noise. If the meter was correct at a little over 28v per coil the amp would start to clip, that would be about 200 watts per coil or 400watts total. I am not sure that is correct as I was using an old sony STR-DE915 for power rated 100w/ channel @ 8 ohms.
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post #1212 of 1716
1/25/13 at 4:21am
You were getting that kind of movement from 400 watts? Wow, that is awesome. I know it is free-air, but that is still pretty solid. I don't think you would even be able to see the XXX move with 400 watts, haha.
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post #1213 of 1716
1/25/13 at 4:55am
Quote:
Originally Posted by mtg90 View Post

Both REW and WinISD have signal generators you could use, REW having more options.
Since the shutter is opening and closing much quicker you need a lot of light to capture video in high speed. At 240 FPS you need 8 times more light then then minimum you need for regular 30 fps video.

I should note that I was unable to push the driver to its limits as I was power limited, though it was starting to make some decent suspension noise. If the meter was correct at a little over 28v per coil the amp would start to clip, that would be about 200 watts per coil or 400watts total. I am not sure that is correct as I was using an old sony STR-DE915 for power rated 100w/ channel @ 8 ohms.

As far as I know it's very difficult to get an accurate voltage reading from anything other than oscilloscope with that low frequency range...correct?
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post #1214 of 1716
1/25/13 at 6:46am
Quote:
Originally Posted by beastaudio View Post

SO. Put two on each channel of the epx4000 that would give them each 550 watts in a "smallish" enclosure or run them all four off once channel of the LG 14k? That wiring to get them to 4 ohms scares me, haha!! much easier the other way....

quoting myself. Yea so that wiring to do all four d2's to a 4ohm final load was a bish, but they are all in and ready to rock. I literally finished mounting the last driver and almost fell asleep, so I didn't even test to see if they worked, haha.
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post #1215 of 1716
1/25/13 at 8:31am
Quote:
Originally Posted by Gorilla83 View Post

As far as I know it's very difficult to get an accurate voltage reading from anything other than oscilloscope with that low frequency range...correct?

Yeah thats why I don't really trust the multi meter but it's all I have. Some of the handheld pocket ones seem to be decent enough and are not too much, just another item to add to my wishlist.
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post #1216 of 1716
1/25/13 at 9:12am
Hey Matt, really love the vids! Is that a shadow I'm seeing or is the surround creasing in several places? Josh mentioned in his review that the surround is "...thinner than usual and very compliant." wondering if this is related, if that's what's happening. Just curious.

Also, how are you generating the test tones? It seems like you are modulating the tone throughout the demonstration. Thanks!
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post #1217 of 1716
1/25/13 at 9:15am
Quote:
Originally Posted by robotbunny View Post

Hey Matt, really love the vids! Is that a shadow I'm seeing or is the surround creasing in several places? Josh mentioned in his review that the surround is "...thinner than usual and very compliant." wondering if this is related, if that's what's happening. Just curious.

Also, how are you generating the test tones? It seems like you are modulating the tone throughout the demonstration. Thanks!

All tall style surrounds crease like that. Even the LMS-Ultra does at the extremes of excursion.

Tone generator. Google it.
Quote:
Originally Posted by beastaudio View Post

You were getting that kind of movement from 400 watts? Wow, that is awesome. I know it is free-air, but that is still pretty solid. I don't think you would even be able to see the XXX move with 400 watts, haha.

Soft suspension - enclosure + sine @ Fs = excursion!

tongue.gif
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post #1218 of 1716
1/25/13 at 9:19am
Cool. Thanks Scott.
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post #1219 of 1716
1/25/13 at 9:26am
I was using the signal generator in REW, I think the modulation you are seeing was when I was adjusting the shutter speed of the camera.
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post #1220 of 1716
1/25/13 at 9:32am
After watching that, it got me wondering about how far away from the at-rest surround my grill cloth should be. I suppose it wouldn't do much harm if it reached out a kissed the cloth now and then. Any thoughts?
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post #1221 of 1716
1/25/13 at 9:46am
Quote:
Originally Posted by baniels View Post

After watching that, it got me wondering about how far away from the at-rest surround my grill cloth should be. I suppose it wouldn't do much harm if it reached out a kissed the cloth now and then. Any thoughts?

That is why I am having second thoughts on my retrofit of the Def Tech 1800. The grill I was going to incorporate was just to get the surround under the surface, but if the driver moves forward, it will end up pushing on the cloth at almost all times. I have a 1.5 inch thick grill on my LMS cabinets. and the drivers are recessed 3/4". I am mulling over the def tech thing, and might just build new cabs and let it roll.

Keep cranking,

Robert
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post #1222 of 1716
1/25/13 at 11:11am
Quote:
Originally Posted by robotbunny View Post

Hey Matt, really love the vids! Is that a shadow I'm seeing or is the surround creasing in several places? Josh mentioned in his review that the surround is "...thinner than usual and very compliant." wondering if this is related, if that's what's happening. Just curious.

I'm going to have to check this out on the production models this weekend. Nick mentioned that the surround compliance was attributed to a proprietary polymer designed for this specific application. I can't speak for Nick or SI and I wouldn't question Ricci's input, but I don't remember an extremely notable thickness difference (to the touch anyway) between the LMS-U surround and the SI...

Not really relevant to anything... Just a general observation.
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post #1223 of 1716
1/25/13 at 11:14am
I'm pretty sure it's the spider that is softer than normal than the surround itself being thinner.
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post #1224 of 1716
1/25/13 at 11:56am
Quote:
Originally Posted by popalock View Post

I'm going to have to check this out on the production models this weekend. Nick mentioned that the surround compliance was attributed to a proprietary polymer designed for this specific application. I can't speak for Nick or SI and I wouldn't question Ricci's input, but I don't remember an extremely notable thickness difference (to the touch anyway) between the LMS-U surround and the SI...

Not really relevant to anything... Just a general observation.

That is in comparison to the obsidian woofers that share the same high roll surround. The composition they went for with the HT subs in much more compliant, and easily noticeable to the touch
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post #1225 of 1716
1/25/13 at 11:59am
It's the complete opposite of my ssd 15s. When I push on the dust cap of the SI 18 it moves with minimal effort the ssd, very tight in comparison. The SI surround material is different. It doesn't feel like rubber surrounds I've had and not foam either.
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post #1226 of 1716
1/25/13 at 3:13pm
Have all three 18's under my curved screen. Still need to calibrate. Thought I would be doing it today, but want everybody out of the house and the kids were off school today. Mael-X is the slightly larger box in the middle.


I know it is not the place for it, but here are the other toys I got this week:
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post #1227 of 1716
1/25/13 at 3:35pm
That looks really clean Mike! Congrats on the toys, totally not the place for me to look at those smile.gif
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post #1228 of 1716
1/25/13 at 3:39pm
Those do look nice.

Sigh. I wish I could get something like that into my HT room. Stupid small door. frown.gif
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post #1229 of 1716
1/25/13 at 3:41pm
Take out part of the wall. Put it back up. Simple.
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post #1230 of 1716
1/25/13 at 3:51pm
Ummm, no. Not so simple. The hallway is also just as narrow. I'd have to tear down part of the house.

But that has been a thought.
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