Fvck MDF

[Kangaroux 5,000+ posts]

FYI - the doors in the bottom pic is in my accord. i'll be undoing all of that very shortly to accommodate larger/deeper drivers. that mounting is too restrictive (airflow from rear). i'll use MDF next time as well, but resin and FG and making a cone-type shape that gets smaller instead of larger, and also open up the door metal more.
in the future - never place interior parts on the ground under the car. put them on top, back seat, or on a workbench. i've ALMOST ran over parts before.

you had an off day - one where you were rushing and shyt went bad. days when you are in a hurry, that happens.

My door panel was sitting in my back seat but after I got the adapter in I took the door panel out but set it on the ground cause I needed to run inside to grab something real quick. When I came back out I saw the adapter was all messed up so that's when I got in the car lol

 

[globalminds_ent 10+ year member]

Don't sweat the small stuff man, life is full of setbacks and disappointment. For example, I'm in the process of collecting parts to build my own welder so I can fix the dog cage that my dog keeps tearing apart (and escaping from).

stop putting your dog in a cage it wouldn't try to escape my dog doesn't have a cage she just lays around the yard and waits to eat

 

[bubbagumper6 5,000+ posts]

stop putting your dog in a cage it wouldn't try to escape my dog doesn't have a cage she just lays around the yard and waits to eat

That would be fine if I had a yard...

Don't tell me how to raise my dog bro

 

[manyhobbies 10+ year member]

Nica and clean. I like that.

That was my problem as well. No way in hell would the screws I had available fit through the MDF and the door, so instead of counter sinking I routed out notches on the tabs and used washers behind the bolts. I plati-dipped the FUCK out of the baffles to keep them from getting wet and splitting.

 

[globalminds_ent 10+ year member]

That would be fine if I had a yard...
Don't tell me how to raise my dog bro

I wouldn't want to live in a cage so I wouldn't put a dog in a cage

 

[manyhobbies 10+ year member]

If screws are an issue, stop by a hardware store, menards, lowes or somethin, somebody has got to have some screws that would work.

Those are the same screws that were used for the factory adapters and I don't have anything in a size that will fit

 

[keep_hope_alive Premium Member]

If screws are an issue, stop by a hardware store, menards, lowes or somethin, somebody has got to have some screws that would work.

Agreed. I have boxes of jars hardware, drawers of hardware. Literally thousands of screws, bolts,etc. but come install time, I make a hardware store run.

 

[nineball 10+ year member]

mdf can work, you just need to seal it and be careful what you do to it. i used t-nuts for the speaker for this set of rings and countersunk 3 holes for bolts to hold it to the door.

a couple layers of resin to seal it (this is after the first one only)

mounted to the door

 

[bubbagumper6 5,000+ posts]

Is that just regular fiberglass resin? Where's the best place to get fiberglass and/or resin? Never used either but I'd like to in the future especially for waterproofing mdf like that (my mdf split because of moisture I believe)

 

[nineball 10+ year member]

Is that just regular fiberglass resin? Where's the best place to get fiberglass and/or resin? Never used either but I'd like to in the future especially for waterproofing mdf like that (my mdf split because of moisture I believe)

if you are just sealing some mdf any old resin will do. this is the only time i would ever suggest using bondo brand (it's cheap and shitty but will seal the wood). you can get it at any lowes or home depot, hell even some wal-marts carry it in the auto section.

if you are going to be building something using glass then Fiberglass , Epoxy , Composites, Carbon Fiber - U.S. Composites, Inc. is the place to shop for supplies.

 

[TheUnderFighter 10+ year member]

I, like others, have heard sealing it with resin works wonders. Also, getting out of MDF all together, I know a guy used several cuts of the plastic material cutting boards are made of, and sealed them together. As strange as it sounds, it's actually phenomenal, and a really nice build all around.

Audi S4 active build with HAT, Zapco - DIYMA.com - Scientific Car Audio - Truth in Sound Quality

It's in there, Post 144, page 6

 

[nineball 10+ year member]

even easier than that is to just buy some cheap cutting boards at wal-mart and make your rings from that. they come in a variety of sizes but 1/2" or more for thickness and you are set. same procedure as wood - a few shallow passes with the router, just on a lower speed.

 

[keep_hope_alive Premium Member]

if you are just sealing some mdf any old resin will do. this is the only time i would ever suggest using bondo brand (it's cheap and shitty but will seal the wood). you can get it at any lowes or home depot, hell even some wal-marts carry it in the auto section.
if you are going to be building something using glass then Fiberglass , Epoxy , Composites, Carbon Fiber - U.S. Composites, Inc. is the place to shop for supplies.

I agree.

Bondo is waxy - meaning you need thin layers, too thick on the first pass and you'll just get a glob. It doesn't soak into the MDF as well as non-wax resins. A heat lamp can help if it is cold - resin has a temperature range to properly cure. hardener needs to be precisely mixed, just follow the instructions and count your drops.

If you just want to waterproof your MDF - run to Walmart, spend

But U.S. Composites is very affordable and far superior to Bondo. Use both, and you'll understand.

Decoupling the baffle from the door can help with structure-borne resonance. the firm closed cell weatherstripping foams can work, as can non-hardening modeling clay. Both are less than $5 to do both baffles.

 

[Kangaroux 5,000+ posts]

Alright, today was better //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif. Cut out a new adapter using that cabinet ply, drilled out the holes for the adapter on my door some to fit a bolt, and then I secured that to the door itself -- this adapter isn't going anywhere lol

 

[Phoenix Risen 10+ year member]

the real problem in the op is the design of the rings, not the material.

ive used mdf multiple times and even cardboard covered in duct tape in a crunch, it all depends on how well you put it together.