Stereo Integrity's new HT Subwoofer - AVS Forum
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post #1 of 2273 Old 09-21-2012, 06:46 AM - Thread Starter
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These look like really good subs for the money. How would (2) of the 18's compare to a FTW-21" with the same power? Here are the specs for the 18" Stereo Integrity:

18" D2

Re: 3.5 Ohms
Fs: 17 Hz
Qes: 0.41
Qms: 5.8
Qts: 0.38
Le: 3.2 mH
Sd: 117841 mm^2
Vas: 411.9 l
BL: 19.7
Mms: 416 g
Cms: 208.8
Sensitivity (1W/1m): 88.7 dB

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post #2 of 2273 Old 09-21-2012, 09:29 AM
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Woops! That's supposed to say 2x SI 18HTd2

FTW21vs2xSI18htd2_zpsaa4fa2fb.gif


Just picked an arbitrary size and made sure the two 18's could fit first. This system pretty much puts the 18's just under the Xmax but it's a flat excursion profile. The FTW has a low Q excursion profile and is approaching it's limit and may pass it under 10hz at this power level. The FTW21 could easily fit in a smaller enclosure but it's low end sensitivity drops.

My Dual 18" LLT subs 120dB down to 10hz

 

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post #3 of 2273 Old 09-21-2012, 10:59 AM
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Yea, I've been watching that thread over at HTS too. Looks like some amazing drivers, if they're able to hit the price point and spec's they're listing.

The 18", which only costs $190, looks like this




while the 15", which is just $170, looks like this




They're also offering 15% off on the preorder, which makes the prices insanely low. Impressive stuff...

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post #4 of 2273 Old 09-21-2012, 11:47 AM - Thread Starter
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I think I am about to pull the trigger on 16 of them. There isn't a better option out there for the money. Any reason why I shouldn't do this? I would be using them in 6 cubic feet with 2 Lap clones powering them.

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post #5 of 2273 Old 09-21-2012, 11:52 AM
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If you don't mind waiting for them... or that small chance that you never get them. Sixteen will surely belt out the bass. Lots of SPL capability there.

My Dual 18" LLT subs 120dB down to 10hz

 

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post #6 of 2273 Old 09-21-2012, 12:03 PM - Thread Starter
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The wait doesn't bother me. I will not have my house finished and theater room done for about 9 more months.

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post #7 of 2273 Old 09-21-2012, 05:01 PM - Thread Starter
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Do you think 2 Lab LP1400 clones would be enough power for 16 of them?

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post #8 of 2273 Old 09-21-2012, 06:34 PM
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Yup. Get the d2 so you can hook up 4 per channel.

My Dual 18" LLT subs 120dB down to 10hz

 

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post #9 of 2273 Old 09-22-2012, 02:16 PM - Thread Starter
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Just in case anyone was wondering the pre-order pricing is:

15" = $145
18" = $162

Pretty hard to beat IMO.

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post #10 of 2273 Old 09-22-2012, 02:29 PM
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Wow, I didn't know they were making HT subs now. The old Mag V2 was one of the most sought after car audio subs for a very long time. I don't know why they stopped making them.

Where do you pre-order? I don't see a place on the website for it.
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post #11 of 2273 Old 09-22-2012, 06:08 PM
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Quote:
Originally Posted by Scott Simonian View Post

If you don't mind waiting for them... or that small chance that you never get them. Sixteen will surely belt out the bass. Lots of SPL capability there.

See boldface.

JSS
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post #12 of 2273 Old 09-22-2012, 08:36 PM - Thread Starter
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Quote:
Originally Posted by maxmercy View Post

See boldface.
JSS
Do you not think they will be produced? Please elaborate.......

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post #13 of 2273 Old 09-23-2012, 04:54 AM
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With a pre-order price, this means that most likely these are currently vaporware. With so many speaker companies coming and going in the last few years, a speaker offering a 'too good to be true' driver may actually be just that. I would hold off until Ricci measures one of these.....but the price is right for a 20mm Xmax 15 or 18" driver.

We'll see...

JSS
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post #14 of 2273 Old 09-23-2012, 08:35 AM
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Quote:
Originally Posted by maxmercy View Post

With a pre-order price, this means that most likely these are currently vaporware. With so many speaker companies coming and going in the last few years, a speaker offering a 'too good to be true' driver may actually be just that. I would hold off until Ricci measures one of these.....but the price is right for a 20mm Xmax 15 or 18" driver.
We'll see...
JSS

A measuring regimen does not a drivers lifetime make. I would hold off until someone else plays guinea pig. tongue.gif

Looking at the 15" cone/surround, it's apparent that the stitching ran off the surround and has stitched only the cone in that spot. IMO, this would indicate an off center situation and needling a bunch of holes into the cone just doesn't seem to be a very good design choice to me.

Everyone likes good value, but I prefer to be sure the materials, adhesives and quality control allow the driver to work within its designed parameters for the rest of my life. Staying in use and out of the landfill has become a top priority for me after having run some 100 drivers through my system over a decade. Seeing those M-X drivers in the trash pile just because a few grams of the wrong adhesive was used is where saving a few bucks blows up in your face.

Of the dozens of drivers I've experimented with, guess which ones, sorted by price, are still in use? smile.gif

The pics only show public baskets, cones, surrounds, mag slugs, partial T yokes and top plates. These days in Guangzhou, those parts are stacked to every ceiling and anyone can assemble them to look like those pics for cheap.

I vote Scott buys a dozen and vets them for us all. biggrin.gif
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post #15 of 2273 Old 09-23-2012, 09:17 AM
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I have the 18 if there's anything you'd like to know about. No enclosure for it yet.
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post #16 of 2273 Old 09-23-2012, 11:41 AM
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If past is prologue, these should be pretty good. SI has been in car audio for a long time and has a great reputation for high performing, high quality woofers. As their first foray into the HT realm, who knows how their performance will be, but I suspect their build quality should be in-line with what they normally produce.
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post #17 of 2273 Old 09-23-2012, 04:35 PM - Thread Starter
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I am going to order 18 of them. 16 for the theater and 2 for backups. I think it is worth the gamble for the pre-order price.

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post #18 of 2273 Old 09-23-2012, 05:12 PM
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that's vegas for ya...lol!

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post #19 of 2273 Old 09-23-2012, 06:10 PM
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Quote:
Originally Posted by bossobass View Post


Of the dozens of drivers I've experimented with, guess which ones, sorted by price, are still in use? smile.gif

I would guess the old AE AV15s and the old Adire Audio Tumults or Brahmas. Which are still in use?

JSS
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post #20 of 2273 Old 09-23-2012, 06:53 PM
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Quote:
Originally Posted by wth718 View Post

If past is prologue, these should be pretty good. SI has been in car audio for a long time and has a great reputation for high performing, high quality woofers. As their first foray into the HT realm, who knows how their performance will be, but I suspect their build quality should be in-line with what they normally produce.

You are correct, but wouldn't it be fair to say that they also have a history of production delays and vaporware (like many other ID companies)?
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post #21 of 2273 Old 09-23-2012, 07:17 PM
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production delays and vaporware (like many other ID companies)?

Certainly. Which is no different than what we deal with now, Some of the subs often touted here have had the same issues, Mach 5, AE, etc. It's the nature of the beast these days.
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post #22 of 2273 Old 09-24-2012, 12:23 AM
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I vote Scott buys a dozen and vets them for us all. biggrin.gif

I might take you up on that if...... these were actually available. wink.gif

Not all that interested in these yet until I can order one while 'in stock' and have it the next week like everything else that actually exists.

Quote:
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I would guess the old AE AV15s and the old Adire Audio Tumults or Brahmas. Which are still in use?
JSS

I vote Tumults and FiCar SSD's. I'm afraid our boy Dave might have tossed out the AV's rather quickly for one reason or another.

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post #23 of 2273 Old 09-25-2012, 02:56 PM
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Great pre sale price, but that Le/Re gets me.

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post #24 of 2273 Old 09-25-2012, 03:36 PM
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For sub duty is Le/Re an issue? What am I missing?
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post #25 of 2273 Old 09-25-2012, 04:14 PM
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For sub duty is Le/Re an issue? What am I missing?

transient response.

WooferSpeed.pdf 44k .pdf file

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post #26 of 2273 Old 09-25-2012, 04:42 PM
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Thanks for the link. The effects of Le are apparent on the tested 6.5" woofer at 4khz, not sure how this would apply to a sub doing 80hz and down.
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post #27 of 2273 Old 09-25-2012, 04:54 PM
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take a look at the impulse response plot. note how inductance damps it down at markers 1 and 2.

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post #28 of 2273 Old 09-25-2012, 04:58 PM
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Interesting article, but I'm skeptical. Yes, i is directly proportional to a in the modified F=ma formula. But that doesn't change the fact that there is a K there (or they used C iirc). All else equal, m = K. As m increases, a decreases. There, I just proved, by their logic, that m is related to transient response.

Also, adding an inductor in series with a woofer obviously will attenuate high frequencies and has nothing to do with transient response. I have a million saved impulse responses of different woofers with different filters applied and the IR always changes. That's because the IR spawns the FR through the fourier transform. The height of the first peak in the IR is often reduced because the higher frequencies aren't as loud.

I'm not saying mass is related to transient response, I'm just saying I'm not convinced Le is related based on what I just read. I always though high Le was indicative of distortion. I dunno, I might be off here. But I see enough issues in their logic that I'm not convinced. I expect better from Adire.
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post #29 of 2273 Old 09-25-2012, 06:04 PM
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From looking at Josh Ricci's testing of high Le drivers (+3 or higher) I don't see an issue, especially with Audyssey's ability to even out the in room response of subwoofers.
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post #30 of 2273 Old 09-25-2012, 06:28 PM
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Didn't the high inductance of the FiCar Q18 effect it's low end sensitivity or is it just a s**t driver in the first place? tongue.gif

Anyway, as I say all the time about this...all things equal a lower inductance is always good. When is it bad? And I don't mean compromises had with measures taken to lower it.

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