"The Grizzlies" Twin Dual Opposed Stereo Integrity HT18 Subwoofers - Page 2

No, I'm going to stick with my original plan, or close to it anyways. These will be behind my screen wall so size isn't a factor. I might back it down a hair to 5 cf per driver, just to make them easier to haul around, lol.

LTD. On data-bass website he states this
" They recommend 600w and no more for this driver. The very compliant suspension results in little power being needed to move the driver to full stroke. SI's recommendations for this woofer make sense in light of this and the driver will not make much use of more than 5 or 600w of power without getting into trouble. Depending upon the particular enclosure design more power could possibly be used but careful measurement and simulation would be needed to assess the wisdom of applying more power. "

Are you sure you wouldn't get into trouble applying 1k watts of power to these guys? Seems a little much to me.

no prob brian.

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depending on the amp, dts might get a little more output if he wires each driver for 4 ohms and runs each driver off of each channel on the amp.

most amps aren't happy with bridged 2 ohms and using just one channel gives up a tiny bit of juice.

ba,

josh mentioned that the recommendation for the lowish power rating is specifically aimed at folks who are using largish enclosures that don't provide much air spring protection and that in smallish enclosures that help control excursion, a little more power than spec can be applied.

iirc, stereo integrity has its roots in car audio, where relatively high tuned ported enclosures are common. in order to protect the driver in systems that don't use a protective high pass filter, many car audio subs will often have very tight suspension to protect the driver if it is driven with too much power or driven below the frequency where it unloads.

here is the excursion of the si's in brian's 6.3 cubic footer with 2,000 total watts. the air spring in the box is providing a lot of protection against over excursion.


Edited by LTD02 - 12/19/12 at 12:37pm

You're probably about right there. I can figure it when I get home later.

That being said, I think 2db's is a bit. Doubling your amplifier power only gets you an extra db (more than that).

You guys are fretting way too much over a couple of cubic feet for maybe 1-2dB ~10hz or so. Make em smaller and use more power. That will make up any dB difference.

Also a consideration, going smaller allows one to fit a 2nd sub nearby and with the same power applied you can get an extra 6dB. Now that's worth it.

What's this "we" stuff?

???

So what would you say is the minimum db increase before considering it a worthwhile jump.

More than one or two but it's up to you! This is DIY.

However, like I mentioned, going small can afford other possibilities. Re-read and absorb the last post of mine you just quoted.

Agreed my friend. In my case I'd rather have the extra room and driver protection vs a db I won't be able to hear anyway. This clone amp is a monster! The SI may need a bit more space though.. I've been playing with the Daytons and SI's. unfortunately one of the SI drivers appears to have an issue. More to come. Output up until max levels seems to be ok though.

It's cool to optomize, but with 4 of these drivers I don't think you'd notice much difference between the two different sized boxes in the end...you'll be just fine either way.

Give it a try as is. I had them in my boxes tonight and they sounded good. You're stressing far too much regarding the last cu foot or so.

I'm going to go out on a limb and guess it was 'death by UPS'. I've had the United Package Smashers damage my shipments at a rate of at least 10:1 over FedEx. What can Brown do for you?

Agree'd. The UPS Gorillas will destroy anything, especially this time of year.

The best all time for me was a $7,500 supercharger that made it in 2 pieces. Still don't know how they did that one.

"Hey, this does not sound like a bell, hit it again and see if it really is a bell or not"

Very possible. It seems like something is just slightly out of spec and it's only a problem at the upper end of the power range. The other driver is 100% fine.


I tried to tell you this.

Have you tried to rotate the driver in the box to see if the knock goes away yet?

Even SI has stated that in Dual-Opposed situation at a smaller box size, with around 1,000 watts, you should be well protected.