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The Dave's Quad 18" Fi IB Build Thread - Page 2

post #31 of 178
Thread Starter 
BTW redesigned my manifold to make it ~19% larger at the opening (~75% of sd of subs). This thing should blow me away!!

It WILL be ready soon!!!

post #32 of 178
I keep following your thread ! Good work. The build is worth the trouble...once completed the smile will be hard to erase.
post #33 of 178
Quote:
Originally Posted by Avus_M3 View Post

This thing should blow me away!!

Trust me, it will. I've sinced been enjoying mine the most actually un-eq'd (setting 6 on my SMS-1). It really lets those raw lower (sub 40hz) notes come through with some serious ass authority!!! My problem seems to be that my house vibrates so much that using the un-eq'd seeing allows much more sub bass to come through because there's not boost on the 60-80hz areas to flatten things (60-80hz seem to excite things the most and can sometimes be over bearing when the volume increases, even though the sms-1 response curve says its flat). I just like the sound better but i'll probably change my mind next week lol. I can tell you this though watching movies like this is the way to go! Had movie night for Beowulf at my house an people were just amazed at what they were hearing and more so feeling!!!

Good luck Avus
post #34 of 178
Yep. Most people don't know what they are missing. Had an idea... but I didn't KNOW until I got my subs built. It's an awesome thing to have plentiful SPL output down into the low teens.
post #35 of 178
Thread Starter 
Quote:
Originally Posted by TheEAR View Post

I keep following your thread ! Good work. The build is worth the trouble...once completed the smile will be hard to erase.

Thanks! Hows the build for your 309 different subs going? You are truly nuts!!

Quote:
Originally Posted by NickTF View Post

Trust me, it will. I've sinced been enjoying mine the most actually un-eq'd (setting 6 on my SMS-1). It really lets those raw lower (sub 40hz) notes come through with some serious ass authority!!! My problem seems to be that my house vibrates so much that using the un-eq'd seeing allows much more sub bass to come through because there's not boost on the 60-80hz areas to flatten things (60-80hz seem to excite things the most and can sometimes be over bearing when the volume increases, even though the sms-1 response curve says its flat). I just like the sound better but i'll probably change my mind next week lol. I can tell you this though watching movies like this is the way to go! Had movie night for Beowulf at my house an people were just amazed at what they were hearing and more so feeling!!!

Good luck Avus

Well, I will be un-eq'd for a little while. I will post full graphs (get to use some of the new functions in REW!) and some initial reactions!

Quote:
Originally Posted by btp View Post

Yep. Most people don't know what they are missing. Had an idea... but I didn't KNOW until I got my subs built. It's an awesome thing to have plentiful SPL output down into the low teens.

I can't wait!!!! I hope these rock my world so to speak!!
post #36 of 178
Thread Starter 
Well...FINALLY an update!!!!!!!!!!!!!!!!!!!!!!!!!


I've been trying to line up a truck to haul the sheets over to my buddy's house and line up a time with him to use his table saw, routers, etc because he has a fully stocked setup.

That didn't work too well. It doesn't matter too much anyways as I haven't had the time to do it. I have been busy working/screwing around with my car, school, and I also had a friend who got out of the Chair Force recently come out here to Cali and move in with us for awhile.
post #37 of 178
Thread Starter 
On to the good stuff...my brother-in-law was over last night and I took the opportunity since I have another set of hands to finally kick this project off (since I am not using my friends' setup anymore).

We started right before dinner time and ended a little after 3am (many beer breaks in-between to wash down the dust in our mouth and throat. I also took the opportunity to clean my nose, ears, eyes, and clear my lungs.

We actually got incredibly accurate cuts using a simple rip fence (mdf sheet) for my skill saw, my trusty compass, and a jig saw to cut the holes.

I did end up acquiring a very nice router and bits from the friend who was going to let me use his tools though! We used it to round over the inside edge where the speakers will sit flush to. I don't know if I want to roundover the exterior edges yet though?
post #38 of 178
The build is stalled a bit. Will resume in a week or so. But driver ordering is non stop.

Please post pics if you can when you can of the completed project. I am thinking myself ordering these drivers, problem to build an IB I would need some serious modifications to the supporting wall.
post #39 of 178
Thread Starter 
Anyways, here some pics of the progress!


Rip Fence setup:




Tools of the trade. My trusty compass:




Drawing the circle:
post #40 of 178
Thread Starter 
Cutting the first circle out:





Circle finished:





Looks Pretty Good!

post #41 of 178
Thread Starter 
Round the edges:





Another angle:





Brace being drawn up:

post #42 of 178
Thread Starter 
BTW I eliminated the exterior sheet (3 layer) of OSB. Just not needed. Besides I could use that sheet for something else.

All that is left is to cut out the last 2 circles which are already drawn and cut out the brace (most difficult part). Should be finished, assembled, primed, painted, and installed soon (Seriously this time)!
post #43 of 178
Looks good, Dave.

Did you test fit the subs in the cutouts you made? I wouldn't corner round the cutout on the panel the driver is attached to. You need all the material you can get for strength. With that in mind, you should make the hole no bigger than it needs to be to allow the driver to sit flush. Sorry if this advice comes a bit too late!
post #44 of 178
btp is correct on the rounding of driver cutouts,the only rounding(cosmeric reasons)that can be made is on the "outside" where the woofer fires.

But looking at your manifold(drawing) it will still be very inert and strong.Three layers and the middle bracing will make for one strong box structure.
post #45 of 178
Thread Starter 
I only rounded the MDF which is what the subs will sit flush too. Sorry if that looked vague or confusing. The subs will be attached to the OSB.

I couldn't work on it last night since I was at a wedding but might get some time in tonight. Either way, a lot will get hammered out tomorrow

I am still searching for options on what I am going to do about the manifold opening. Any thoughts?
post #46 of 178
Manifold opening...a white or black grill can cover the opening.A removable grill.

Cloth stretched over a frame, a cloth brings no audible artifacts even as it vibrates when SPL gets serious. Easy and inexpensive to do.
post #47 of 178
Thread Starter 
I was thinking getting some trim like door trim and making a surround for the opening with speaker cloth stretched accross. Paint the trim white to match the doors and molding and paint the cloth the same as the wall?
post #48 of 178
Thread Starter 
More Updates!!

I didn't get as much time as I wanted to on the manifold but still did a lot (another late late night/morning). Unfortunately, my wife’s car blew a heater hose and I had to troubleshoot that first .

Anyways, we finished cutting the OSB and cutting out the brace which was a pain. Since I don't have a 1/4" round over I had to use the 1/2" that my buddy gave me with the router. I adjusted the depth pretty high so it took the corner edge off but still had a solid surface for the bearing to ride on.
post #49 of 178
Thread Starter 
After that, I hand sanded the brace down to round over the interior cuts and take the slight edge off the router left. For using the tools available (drill and jigsaw) I would have to say it came out pretty damn good - best that can be expected at least.

I also test fitted the subs in and they are nice and snug. I am really noticing why some people go insane on bracing for massive ported and sealed boxes. I forgot how flimsy MDF can get. The manifold really really locked together when we added the brace though. I don't see how people get away designing these manifolds without them??

The span for the 2 woofers in each side seriously needs a tie point to hold it together.
post #50 of 178
Thread Starter 
Also, after assembling the box last night I decided I am going to add the third layer for a couple reasons:

1) I have the wood - might as well use it?
2) I have the space in the attic _ not going to be an issue
3) After seeing just one of these monsters loaded, I feel it really needs it
4) I want more than a single sheet of OSB to mount to so I was going to cut blocks for the rear mounting - why not just cut a whole side sheet??
post #51 of 178
Thread Starter 
Anyways, here are a few of the pics:

Cutting the Brace
post #52 of 178
Thread Starter 
Finished Hand Sanding the Brace







post #53 of 178
Thread Starter 
Starting assembly





Brace Install





It squared up pretty nice!!

post #54 of 178
Thread Starter 
Laminating the sides







post #55 of 178
Thread Starter 
Test Fitting The Sub




post #56 of 178
Thread Starter 
Sooooo Sexy (Magnet Protruding Out)





Coming along real nice!!

post #57 of 178
Thread Starter 
Not quite ready for the "Sit In Your Sub Club" but a lame head shot at 3:15am nonetheless

post #58 of 178
Looks great!
post #59 of 178
Great work !

The most displacement per dollar ,no contest !
post #60 of 178
You did a fine job cutting those circles out without a router.... No wonder, I dont see any coffee cups sitting around!
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