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Fi IB3-18 x 8 and SEOS pure 10 kits! - Page 7

post #181 of 1021
Quote:
Originally Posted by MKtheater View Post

If they don't hurry up I may go for the 24's! I was under the impression they would be available at the time of order. The SI's were still in prototype mode.

I'm getting excited again!!!
biggrin.gif
post #182 of 1021
Quote:
Originally Posted by MKtheater View Post

If they don't hurry up I may go for the 24's! I was under the impression they would be available at the time of order. The SI's were still in prototype mode.
I think you'd be crazy to go with the 24's at this point in time. To many unknowns and questions that need answering from SI. Being a first adopter is generally never a great idea IMO anyways. Unless they can get some actual proper tested results, I'd wait until they do.
post #183 of 1021
Go with the 24's! smile.gif
post #184 of 1021
Thread Starter 
Any real data on the IB318's? Jon J from AE claims his 15's are the best IB subs with less rolloff! However they have 3 liters of dispacement so it would take 2.5 of them to equal the FI 18. Now with proper power that is a 9 dBs advantage for the FI drivers so the FI would have to rolloff 9 dBs more than the 15 to be appealing to me.
post #185 of 1021
technically he is right, but it is a goofy way to look at it.

for all practical purposes, for an ib sub, displacement is the game because the power requirements are so low, where the natural rolloff occurs is, to use bosso's favorite word...irrelevant.
post #186 of 1021
Thread Starter 
That is what I thought. The Fi 18's look to be a great option.
post #187 of 1021
I use 4 IB318s, really great drivers!
post #188 of 1021
Quote:
Originally Posted by MKtheater View Post

Any real data on the IB318's?

What type of data?
Quote:
Originally Posted by MKtheater View Post

Jon J from AE claims his 15's are the best IB subs with less rolloff! However they have 3 liters of dispacement so it would take 2.5 of them to equal the FI 18. Now with proper power that is a 9 dBs advantage for the FI drivers so the FI would have to rolloff 9 dBs more than the 15 to be appealing to me.

His drivers are nice, and to think a short time ago, when purchased as a quad set, the 15" IB drivers were $100 apiece! They were unavailable at the time of my build, otherwise I very likely would've used them.
post #189 of 1021
Thread Starter 
At $100 each I would buy them as well! I don't like the X-max of 18mm for an IB driver. 3 liters is what I had already with little roll off so going with those would be nearly identical as my previous setup with 12 drivers.
post #190 of 1021
Thread Starter 
They are in route! Wednesday delivery!
post #191 of 1021
Great!
post #192 of 1021
Quote:
Originally Posted by MKtheater View Post

They are in route! Wednesday delivery!

Right on!
post #193 of 1021
hoorah. got your baffles ready to lock and load?
post #194 of 1021
Thread Starter 
I will before they get here. The wall is done is except the ply so it is a matter of finishing up and sealing. I have to wire everything up as well. I am thinking to either put some ATS acoustics on the front of the all or just use sound board. I am not sure how thick I need as sound board is 1/2 inch thick.
post #195 of 1021
Quote:
Originally Posted by MKtheater View Post

They are in route! Wednesday delivery!

Sweet!! Very interested to see how they perfom for you in the room.
post #196 of 1021
You may have your wiring figured out already. I mounted a waterproof junction box on each of my manifolds. I had a hole in the manifold and the junction box had a hole in the bottom.



I then drilled the junction box sides and installed two Neutrik TLT4MP 4-pole Speakon connector. One is the OUT connector for both pairs of drivers and one is the IN connector for the drivers that had the wiring on the ouside of the box. My manifold has both outward and inward facing drivers so I have two drivers with wiring inside the box and two with wiring outside the box.



For the drivers with wires on the outside of the box I connected both drivers in parallel and then to a Speakon than inserted into the IN Speakon on the box. I wired the two drivers with wires in the box in parallel and to the OUT 4-pole connector. I also connected the IN Speakon to the OUT Speakon. Make sense? I bought some Dayton 13 gauge 4 conductor speaker wire and put a 4-pole Speakon on 1 end and 2 Speakons on the other end. I connected the single 4-pole to my OUT Speakon on the box. This allowed me to use one cable from one manifold to connect to two channels of my amp. I did the same with the other manifold.

You will have all your wiring on the outside of the boxes so it will be easier. However, you could run all 4 manifolds to 1 junction box and then use Dayton 8C wire to run from the junction box to your amps. Just use an 8-pole Speakon on the junction box and one end of the speaker cable and use four Speakons on the other end of the speaker cable for 4 channels of amplification. Or are you running each driver off a separate channel?
post #197 of 1021
I put a new Crown XLS-1500 on my set of four Fi 18's and during a test, it was pretty clear I need to do more bracing on my wall. It's a non-loadbearing cosmetic wall that encloses the mechanical room. My baffle itself is framed with 2x6's and using 2x4 sections of 3/4" MDF (two drivers per panel) with a pair of 2x6's in the center of the opening. Behind that doubled up 2x6, I've got a short 2x6 to "preload" the baffle onto a metal support pole that holds up the i-beam for the middle of the house. That brace is less than 6" long so it was quite surprising to see the clamping action of the four drivers and their ability to affect the rest of the wall. My three mains are adjacent and enclosed in backboxes and you can clearly see them oscillate on heavy material. LOL. I need to triangulate the rest of the wall behind the screen. This isn't air pressure but mechanical in nature, as there's a ventilated door far to the rear of the utility area.

eek.gif
post #198 of 1021
Thread Starter 
Anyone have a near field measurement of the Fi driver?
post #199 of 1021
i searched around for that a while back mk and was surprised that i could not find any given how many of these subs are used in infinite baffle setups.
post #200 of 1021
I remember there being a member a while back who had 8 FI 18's in his IB setup. He had them going up the right and left side of his screen I believe.
post #201 of 1021
Please post pics when the drivers are unboxed. I can't wait to keep following this build.
post #202 of 1021
Thread Starter 
Will do!
post #203 of 1021
How stiff and braced is your wall, or should I say, how did you brace it? If it is not braced enough, your bass losses will be huge.
post #204 of 1021
Thread Starter 
I am making 4 manifolds all with 1.5 mdf and 1.5 OSB like the Cult recommends. My wall is screwed to the concrete floor and 10 inch planks above with 2x6 treated lumber. I then made the usual framing for a wall and every manifold opening will be double to triple braced with 2x4's. 2 of the manifolds will be supported by my concrete floor and the other two will have 2x4 supports. Let me know what else to do as the drivers arrive tomorrow.
post #205 of 1021
Thread Starter 
Drivers will be here today!
post #206 of 1021
cool.gif I can't wait to see some hot driver on manifold action. tongue.gif
post #207 of 1021
Thread Starter 
Once the wall is up it won't look as impressive as other setups I have owned by this will be the most potent based on displacement. The wall also shrinks my room from 1820 cubic feet to 1574 cubic feet. Before I treated the room is started off as 2100 cubic feet.
post #208 of 1021
Quote:
Originally Posted by MKtheater View Post

Once the wall is up it won't look as impressive as other setups I have owned by this will be the most potent based on displacement. The wall also shrinks my room from 1820 cubic feet to 1574 cubic feet. Before I treated the room is started off as 2100 cubic feet.

Maybe, but we all know what is under the "skirt" so we will pine lust after it anyway. biggrin.gif I cannot fathom the amount of room gain you are going to have. smile.gif
post #209 of 1021
Thread Starter 
I should be flat to 3 hz at reference.
post #210 of 1021
Thread Starter 
I don't know how fedex separated them but I received 4 of the woofers and the last 4 will be here Thursday.
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