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post #1351 of 2237 Old 02-02-2013, 01:27 PM
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Quote:
Originally Posted by DanLW View Post

t would be nice if a mechanical drawing of the HT18 subs was available. I probably won't start my build until the 15th of February, but there's a very good chance my drivers won't be here by then, and it would be nice if I was able to have exact measurements before I start cutting wood.

I made some reasonably accurate drawings with measurements I took from one of the prototypes. What dimensions do you want?
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post #1352 of 2237 Old 02-02-2013, 02:28 PM
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Nick and Jacob came this weekend to swap out the D4's with my D2's...

So, I was finally able to open one of the boxes to compare them to my LMS-U's.














 

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post #1353 of 2237 Old 02-02-2013, 02:39 PM
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Now you're ready to make some noise! The SI is definitely dwarfed by the LMS. I tell you though, after installing the SI's it was such a pleasure with their light weight in terms of maneuvering them and not having to worry about my fingers when I lowered them down to be mounted.
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post #1354 of 2237 Old 02-02-2013, 04:10 PM
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That's a nice size perspective. The SI's look huge until you put them up next to those LMS's.

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post #1355 of 2237 Old 02-02-2013, 05:08 PM
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Quote:
Originally Posted by baniels View Post

I made some reasonably accurate drawings with measurements I took from one of the prototypes. What dimensions do you want?

My dad got my drivers today, and did some rough measurements. Perhaps you can verify what he got.



It looks like to mount the driver, I need to cut a hole 16 3/4" in diameter. Do these numbers match up to what you got?

I probably won't have these on hand for a week at best, 6 weeks at worst. The Military Postal Service is anything but reliable...
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post #1356 of 2237 Old 02-02-2013, 06:37 PM
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The 16 3/4 is right.

The 9 1/4 is 9 3/4..

I never measured with the rubber gasket, which I assume your dad did. Without the gasket, the 18 3/4 is 18.25 and the 5/8 is about 0.37. I'm on my undocked laptop right now and it's less than ideal for laying out a dimensioned drawing. If I can clarify anything else, let me know. Any chance you have any 3D software (ideally not Sketchup)?
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post #1357 of 2237 Old 02-03-2013, 07:15 PM
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Quote:
Originally Posted by Aaron Smith View Post

Yeah, sorry about that again. That was 180 degrees out of phase...I was experiencing technical difficulties for whatever reason.

The limit would be mechanical because the suspension travel is the limiting factor; not the coil (which probably describes 95% of woofer drivers out there). Have you read the review at Data-Bass? Excerpt from the Sealed System test: "The woofer specs lend it to use in large EBS vented or even IB installs but mechanical power handling in large enclosures should be kept in check with the highly compliant suspension as it can be bottomed. Thermal handling seems to be less of an issue." You probably have seen those tests, but Josh touches on the power rating a few different times.

The limit may be thermal after all. N8DOGG managed to melt voice coil of a SI 18HT driver in 3 cu.fft box with 1kW Dayton plate amp
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post #1358 of 2237 Old 02-03-2013, 07:19 PM
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One instance does not a pattern make......

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post #1359 of 2237 Old 02-03-2013, 09:16 PM
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Quote:
Originally Posted by zheka View Post

The limit may be thermal after all. N8DOGG managed to melt voice coil of a SI 18HT driver in 3 cu.fft box with 1kW Dayton plate amp

Our rating is not absolute thermal for the coil. If someone was clipping the amplifier to death you can melt almost any coil no matter what the rating (baring a 4" or 6" coil of substantial WW and the power applied being clamped and not imagined).
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post #1360 of 2237 Old 02-03-2013, 09:21 PM
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Quote:
Originally Posted by popalock View Post

Nick and Jacob came this weekend to swap out the D4's with my D2's...

So, I was finally able to open one of the boxes to compare them to my LMS-U's.


You need to live farther down south. 21 degrees was not nearly as warm as 48 degrees back in NC where we came from. tongue.gif

But in all seriousness Jacob and I had a good time traveling up that far and seeing Austin's plans for his HT room. If he [Austin] follows through with any of the plans that he showed us he is going to have some serious bottom end! Very cool and well laid out theater room with the right equipment and plans for the future. Keep us updated with the progress Austin!
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post #1361 of 2237 Old 02-03-2013, 09:26 PM
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Quote:
Originally Posted by Electrodynamic View Post

Our rating is not absolute thermal for the coil. If someone was clipping the amplifier to death you can melt almost any coil no matter what the rating (baring a 4" or 6" coil of substantial WW and the power applied being clamped and not imagined).

Posted by Bill in another thread
Quote:
Nope. A woofer never sees a true square wave. It only sees that portion of the square wave that remains after it has passed through the crossover, or if there is no crossover that which remains after being filtered by the inductance of the voice coil. If your links show an oscilloscope trace of a square wave then totally clueless they be, for no speaker ever sees a waveform that even vaguely resembles that.
As far as speakers are concerned there's nothing special at all about a clipped waveform, it's just another complex waveform, and they treat it just like every other complex waveform that they deal with with every pulse they receive.
If clipping bothered woofers in the least then every guitar player would be replacing drivers as often as they replace strings.

So which one is it?

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post #1362 of 2237 Old 02-03-2013, 09:52 PM
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I thought that some people knew more about this [clipping] but since that quote was brought up I guess I'll entertain your notion of clipping not leading to any additional power at all to excess power sent to the coil. The "complex waveform" mentioned in the aforementioned post can/does lead to excess power. If you're sending 10 clipped to death watts through a pure tube class A amp to a 100 watt speaker you won't have any problems. However, if you're clipping a 1000 watt class A/B amplifier to a 500 watt speaker you can easily achieve 1700 watts of actual power output. Where is the actual clamped power data to support any of the "clipping does not hurt" data?
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post #1363 of 2237 Old 02-04-2013, 12:22 AM
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Quote:
Originally Posted by zheka View Post

The limit may be thermal after all. N8DOGG managed to melt voice coil of a SI 18HT driver in 3 cu.fft box with 1kW Dayton plate amp

Aye!? When did this happen?

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post #1364 of 2237 Old 02-04-2013, 05:13 AM
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I think it was two drivers at the same time. Read that last night. Then I had a dream about blowing drivers.
Quote:
Originally Posted by zheka View Post

N8DOGG managed to melt voice coil of a SI 18HT driver in 3 cu.fft box with 1kW Dayton plate amp
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post #1365 of 2237 Old 02-04-2013, 12:49 PM
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Quote:
Originally Posted by baniels View Post

I think it was two drivers at the same time. Read that last night. Then I had a dream about blowing drivers.

Uhhhhhhhhhhh....................eek.gif

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post #1366 of 2237 Old 02-04-2013, 01:10 PM
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No joke. I read that thread right before bed and dreamed I fried two drivers (oddly/happily they weren't my SI's).

EDIT: You knew what I meant biggrin.gif
Quote:
Originally Posted by brian6751 View Post

Quote:
Originally Posted by baniels View Post

I think it was two drivers at the same time. Read that last night. Then I had a dream about blowing drivers.

Uhhhhhhhhhhh....................eek.gif
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post #1367 of 2237 Old 02-04-2013, 01:21 PM
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post #1368 of 2237 Old 02-04-2013, 01:49 PM
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biggrin.gif

I started to post something about that comment and chose to take the high road. I see you opted for the low one. biggrin.gif

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post #1369 of 2237 Old 02-04-2013, 02:15 PM
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I will undue my inadvertent derailing by providing some measurements of the D2 for anyone who needs it. I will say that this is "reasonably accurate". It worked to keep all my dowels from touching the magnet and basket, with some pretty close margins.

GASKET NOT FACTORED IN. These measurements are from the bare basket/flange. Tread carefully, yee flush mounters.

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post #1370 of 2237 Old 02-06-2013, 09:48 AM
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Before

New configuration
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post #1371 of 2237 Old 02-06-2013, 09:53 AM
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I think I must have been sitting in a null before. Lacking at the seats but impactful if standing near the wall. Now the giant has awoken, now I'm excited. For music I'm already lovin the sound. Now time to critically dial in. As is, mondo impact with the FP14k and minimal cone movement.
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post #1372 of 2237 Old 02-06-2013, 10:29 AM
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Sweeet! I love to hear it when a problem as such is fixed. You should be getting enormous amounts of bass in that room.

I like the stacked config too. Looks good! smile.gif

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post #1373 of 2237 Old 02-06-2013, 11:06 AM
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where the heck are you putting everything else??? haha. That is also very interesting that just a re-orientation of the boxes yielded better results...

(European models do not accept banana plugs.)

 

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post #1374 of 2237 Old 02-06-2013, 11:12 AM
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You should try the "before" with your drivers oriented at the top instead of the bottom. Or some at the top and some at the bottom. smile.gif
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post #1375 of 2237 Old 02-06-2013, 11:18 AM
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Thx Scott, with SIs up front and 4) 15s behind, output is there! Beast, the page before I posted a pic of my front stage. Matching center coming but everything is behind my AT screen.
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post #1376 of 2237 Old 02-06-2013, 11:21 AM
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Woot!

Now that I want to see. smile.gif

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post #1377 of 2237 Old 02-06-2013, 11:22 AM
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Quote:
Originally Posted by djkest View Post

You should try the "before" with your drivers oriented at the top instead of the bottom. Or some at the top and some at the bottom. smile.gif
if I don't get the ulf I'm looking for after implementing eq then I'd be game to try something. I had this configuration before with the ssd 15s so I pretty much knew what to expect in terms of how it feels at the seats.
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post #1378 of 2237 Old 02-06-2013, 11:38 AM
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Not SI related, but one my 2242s which in a sealed box has noticeably more excursion than the other. Amp and crossover levels are the same. Could it be an air leak or possibly just audyssey eq ing the one more aggressively as it doesn't have as much boundary support as the other?
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post #1379 of 2237 Old 02-06-2013, 12:35 PM
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Could be a combination of both. Do the feather/lighter trick to find any holes, as that, with as sensitive as that driver is will make a huge difference.

(European models do not accept banana plugs.)

 

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post #1380 of 2237 Old 02-06-2013, 01:45 PM
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Cool thanks!
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