Stereo Integrity's new HT Subwoofer

Woops! That's supposed to say 2x SI 18HTd2




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.

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...

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.

Yup. Get the d2 so you can hook up 4 per channel.

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.
Edited by 95bat - 9/22/12 at 5:18pm

See boldface.

JSS

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.

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?

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.

I have the 18 if there's anything you'd like to know about. No enclosure for it yet.

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.

that's vegas for ya...lol!

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

JSS

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)?

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.

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

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.


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.

Great pre sale price, but that Le/Re gets me.

For sub duty is Le/Re an issue? What am I missing?

transient response.

WooferSpeed.pdf 44k .pdf file

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.

take a look at the impulse response plot. note how inductance damps it down at markers 1 and 2.

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.

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.

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?

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.