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Stereo Integrity 24" subwoofer - not kidding! - Page 3

post #61 of 522
Quote:
Originally Posted by Electrodynamic View Post

Good luck! wink.gif If only it were that simple. biggrin.gif

Well, to be fair, I know it's not that simple but if you are using the pre-fabed parts, it would take a huge expense out of the equation of having to design something from the ground up, if in fact what was available was usable. I'm looking forward to the 24" HT version. It could be a great option for lots of guys. I will for sure get one to test out.
post #62 of 522
Quote:
Originally Posted by bass addict View Post

That's it? I'm out.

lol...
post #63 of 522
Quote:
Originally Posted by N8DOGG View Post

Well, to be fair, I know it's not that simple but if you are using the pre-fabed parts, it would take a huge expense out of the equation of having to design something from the ground up, if in fact what was available was usable. I'm looking forward to the 24" HT version. It could be a great option for lots of guys. I will for sure get one to test out.

I know. I was just busting your balls. wink.gif We are in the process of making another IB prototype (a few changes to the motor/coil) and we have started the motor design for the HT version but we do not have any parts for it produced at this time. When progress is made on the sealed/ported version I'm sure news of it will leak onto this forum. smile.gif I'll also post about it on SI's forum.

You are correct - tooling a 24" custom frame would be VERY expensive. Thankfully this frame is an open tool along with the cone body and surround. We had to tool up two adapters in order to make this beast work properly. One of the adapters is a huge 25mm thick aluminum spacer ring that also acts as a shorting ring.

Here is a picture of the adapter:


And the 24" next to our HT 18":
post #64 of 522
Quote:
Originally Posted by Electrodynamic View Post

You're assuming a lot and all of your assumptions are wrong. The first and most important erroneous assumptions are highlighted in bold. Almost nothing is shared between our HT line and this woofer. Well, the speaker terminals are the same. That's it.

The voice coil on this woofer is a 71mm ww eight layer flat wire wound on a 76.7mm ID stainless steel former. The motor is a 220mm OD 75mm stack with a 30mm top plate. Far from the motor that we designed for our HT line. This 24" also uses a 257mm OD spider pack. You're assuming that Xmax is the same as our HT line where this 24" woofer has an Xmax of 35mm.


Let me first thank you for the reply. This is part of what i was getting at. The other that when you leave too many things open and not explained people will make plenty of assumptions. As I mentioned previously I felt confident that most of mine were incorrect; I was simply basing them on the information that you had previously provided. In the future it may be beneficial to lead in with a little more detail to prevent others from doing as I did. Your company makes great product. It has done this in the past and I'm sure future products under the same ownership/ design team will be as well.

Now to your specs; OK you went from a 2.5 inch voice coil to a 2.8. Still somewhat underwhelming for the size driver being discussed. The motor seems moderate with what I believe would be an excellent top plate. The top plate thickness somewhat making up for other aspects of the motor structures moderate components. You didn't give a figure for BL by the way, is it available? The Xmax seems decent and I did truly expect some improvement here over the 18, so it is nice to see a significant jump here. Still not an overwhelming figure her though, given the driver being discussed. A spec for Fs would also be nice if available.

Now to the final point I was assuming; comparison of relative value between this driver and the SI 18. This is currently being based solely on displacement as Fs and BL have yet to be provided. Given the Xmax given for each driver (here I must assume the 35mm spec you give for the 24 is one way as you did not specify) This gives the 24 inch driver a total displacement of 909.5 cubic inches and the 18 a total of 323.6 for a single driver. This absolutely shows i was incorrect when comparing 2 18's to one of the 24's and shows that it would take 3 of the 18's to best the single 24 in displacement. Still somewhat cheaper than the price speculated for the 24 but more understandable given the higher cost of parts for the 24 as described before considering supply and demand. But still giving the edge to multiple 18's due to cost and the aforementioned diminishing returns on comparable investment.

Once again I am not trying to knock Stereo Integrity. they make great product and make it comparably affordable. When it comes to bass there are no substitutes for cubic inches and engine strength. I also realize that engine strength and power can sometimes be limited to other factors like cone strength, Xmax, etc. I learned this the hard way many years ago using the original Cerwin-Vega Strokers in our comp. car. A '72 Caddilac hearse with 6 18's. Those drivers had a hell of a motor, so much so that the drivers didn't fail but we ended up folding the cones around the inside lip of the surround attachment point because the motor was so much stronger than the cone. It was fun figuring out how to reinforce them before the next event. Once resolved it wasn't too long before 176db+ was a regular occurrence at IASCA and SLAP events.
post #65 of 522
Quote:
Originally Posted by Electrodynamic View Post

I know. I was just busting your balls. wink.gif We are in the process of making another IB prototype (a few changes to the motor/coil) and we have started the motor design for the HT version but we do not have any parts for it produced at this time. When progress is made on the sealed/ported version I'm sure news of it will leak onto this forum. smile.gif I'll also post about it on SI's forum.

You are correct - tooling a 24" custom frame would be VERY expensive. Thankfully this frame is an open tool along with the cone body and surround. We had to tool up two adapters in order to make this beast work properly. One of the adapters is a huge 25mm thick aluminum spacer ring that also acts as a shorting ring.

Here is a picture of the adapter:


And the 24" next to our HT 18":

Nice! Thanks for the pics. That looks like a beast.
post #66 of 522
Dang! The scale is apparent in that picture!
post #67 of 522
Quote:
Originally Posted by Electrodynamic View Post

Mounting depth = deep. wink.gif

I've heard THAT before..... tongue.gif
post #68 of 522
That pic....My god...

Nick, treading into new territory here on this one, that is awesome! Not sure why I would need these, but guess I will make my IB manifold that I am experimenting with in conjunction with the 8 SI's a little bigger now...Just so I could fit these if I wanted!! haha.
post #69 of 522
Thread Starter 
Nick,

when you said one of these will perform like 5 18HT's did you mean this IB version or the upcoming HT version?
post #70 of 522
Quote:
Originally Posted by Electrodynamic View Post


And the 24" next to our HT 18":

F********** Yes! I thought the 18's were monsters.

Here is the 18" vs 15" for more perspective:
post #71 of 522
We're getting ever so close to Marty Mcfly / Doc size woofers.
post #72 of 522
Quote:
Originally Posted by Electrodynamic View Post


And the 24" next to our HT 18":

eek.gif

I'm re-interested in this one. Yup.
post #73 of 522
Quote:
Originally Posted by Mr. Bubbles View Post

This gives the 24 inch driver a total displacement of 909.5 cubic inches and the 18 a total of 323.6 for a single driver.

Quick question. Based solely on the above math, would this qualify as the highest displacement driver on the market when it becomes available?

Can anyone confirm?
post #74 of 522
the re xxx 18" with 1210 cm^2 sd and 54mm (rated) xmax would clock in at ~799 cubic inches displacement.

so it would seem like 909 is the displacement champ.

but, there is always a bigger fish. this one is 34" in diameter. that is roughly 900 cubic inches of displacement per 12mm of throw. i don't know what the xmax rating is.

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), default quality
post #75 of 522
That's a Audiobahn driver.
post #76 of 522
Specifically the AWT34X.
post #77 of 522
post #78 of 522
I dont like the look of that basket on the Audiobahn woofer. It looks fragile. But thats just my quick thoughts. That spacer is gorgeous on the SI 24"!!!!!

And 30mm is insane for that 34" woofer. WOW. What is that price 3500 or more? Kinda like the MTX Jackhammer and that its cost is ridiculous.
post #79 of 522
Quote:
Originally Posted by lukeamdman View Post

That's a Audiobahn driver.

Quote:
Originally Posted by lukeamdman View Post

Specifically the AWT34X.

Quote:
Originally Posted by lukeamdman View Post


I disagree. The magnet one sub posted by LTD is not Audiobahn style... It's the Cadence 34" sub.

http://www.onlinecarstereo.com/CarAudio/p_33586_Cadence_DCX34W.aspx

http://www.cadencesound.com/dcx34w/
post #80 of 522
Isn't that the same type of basket the FTW has?

Edit: I misread the post. Thought the comment was about the basket on the SI looking flimsy, not the Audiobahn/Cadence. Carry on.
Edited by wth718 - 4/26/13 at 8:17pm
post #81 of 522
Quote:
Originally Posted by popalock View Post



I disagree. The magnet one sub posted by LTD is not Audiobahn style... It's the Cadence 34" sub.

http://www.onlinecarstereo.com/CarAudio/p_33586_Cadence_DCX34W.aspx

http://www.cadencesound.com/dcx34w/

Having owned Audiobahn way back in the day, it's definitely Audiobahn "style":

post #82 of 522
5500 for the Audiobahn. And from what others have stated 18" motor structure thrown on a 34" woofer. Cadence has a deal at 3200 for one. biggrin.gif This is all crazy talk of coarse seeing that shipping for me would be probably about 500 or more. So the 24" would be about as big as I could ever go.
post #83 of 522
Quote:
Originally Posted by popalock View Post



I disagree. The magnet one sub posted by LTD is not Audiobahn style... It's the Cadence 34" sub.

http://www.onlinecarstereo.com/CarAudio/p_33586_Cadence_DCX34W.aspx

http://www.cadencesound.com/dcx34w/

Actually, I'm going to STFU because I think it's the same sub...lol

Thanks for thread jacking LTD...lol
post #84 of 522
Quote:
Originally Posted by popalock View Post

Actually, I'm going to STFU because I think it's the same sub...lol

Thanks for thread jacking LTD...lol

Other than the yellow magnets on the Cadence and the blue magnets on the Audiobahn, from the back they look identical.
post #85 of 522
"Thanks for thread jacking LTD...lol"

post #86 of 522
From when I was in the 12V industry, it has been my understanding that the Audiobahn and Cadence 34" woofers are the same with different color magnets. This could be entirely incorrect as I have personally never dealt with either. I did work a lot with the original CV Strokers and the Clarion 32" sub. I still have one of the Clarions but not much luck using it in HT so far due to size/ cabinet, etc. But it's displacement is not that great anyway; I think around 650 cubic inches. A couple of the HT 18's would prob kick it ass pretty bad.
post #87 of 522
Quote:
Originally Posted by wth718 View Post

Isn't that the same type of basket the FTW has?

Edit: I misread the post. Thought the comment was about the basket on the SI looking flimsy, not the Audiobahn/Cadence. Carry on.
It does look like a 24" version of the FTW basket. If thats the case, it's a VERY sturdy basket and of great quality.
post #88 of 522
Quote:
Originally Posted by N8DOGG View Post

It does look like a 24" version of the FTW basket. If thats the case, it's a VERY sturdy basket and of great quality.

It is. And yes, it is a very good quality basket. Nick will have no issues with the motor size he has chosen to go with.
post #89 of 522
Quote:
Originally Posted by mrogowski View Post

It is. And yes, it is a very good quality basket. Nick will have no issues with the motor size he has chosen to go with.

Mark is right and he, out of all people, can attest for this style of basket's abilities. I haven't seen anyone having problems out of the big drivers he builds with larger motors than what is on this prototype IB 24".
post #90 of 522
I think even UPS may have a hard time breaking it! (though I'm sure they'd find a way)
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