Cutout hole for 12" Type R ??? *PICS*

[SHiZNiLTi 10+ year member]

i think it will have an affect on the port length bro if you decrease the internal volume....
Someone correct me if im wrong please.

Ya I think your correct on that. If I double up those two sections its gonna thow off the port length that was calculated for about 3 cubes at the time.

This is close to setup Im working on, does it sound like the sib is bottomoing out on first few seconds?

http://www.realmofexcursion.com/videos/Alpine/typer12.51.wmv

 

[SHiZNiLTi 10+ year member]

deja vu... i think i've seen those pics before //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
if you put in those two pieces i get about 2.75ft^3 @ 33Hz

the more volume to take away from the inside of the box the higher the tuning will be.

Really? that would be great news if I put those two pcs in and get 2.75 @ 33hz i was worried it would lower the tuning more to 28 or something which is definatly not what I want.

can someone confirm this also, Im adding it up now.

Thanks!

 

[PV Audio 5,000+ posts]

i think it will have an affect on the port length bro if you decrease the internal volume....
Someone correct me if im wrong please.

You aren't wrong per se, you just didn't word it correctly //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Adding stuff to the inside decreases the Vb (net internal volume). Port tuning depends on three things: port area, port length, and internal volume. There's a relationship between the three. Given the same box for each experiment, here's what happens:

a. an increase in port area increases port tuning and requires either a longer port length (and conversely more Vb to compensate) or more internal volume

b. an increase in port length MAY and USUALLY does give you a lower tuning, but it lowers the Vb. If your box is already too small, increasing port length is futile because the more airspace u take away, the higher the tuning will get

c. an increase in internal volume will always lower port tuning no matter what the other two are doing

 

[xluben 10+ year member]

if i were you i'd just buy the big amp, and try the box how you made it.

slowly turn up the gain while standing close to the sub, so you can hear any mechanical stressing.

just leave the gain at a level that isn't damaging to the woofer and see how you like it.

in a couple weeks if you don't like it, then start changing the box //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[PV Audio 5,000+ posts]

Really? that would be great news if I put those two pcs in and get 2.75 @ 33hz
can someone confirm this also, Im adding it up now.

Thanks!

That's still a little big, but better than nothing //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

The r's I've used have always been happy in 2.25....although you should probably listen to tommy as he's probably the resident type-r expert.

 

[tommyk90 5,000+ posts]

That's still a little big, but better than nothing //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
The r's I've used have always been happy in 2.25....although you should probably listen to tommy as he's probably the resident type-r expert.

2.25 is a happy medium. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[SHiZNiLTi 10+ year member]

if i were you i'd just buy the big amp, and try the box how you made it.
slowly turn up the gain while standing close to the sub, so you can hear any mechanical stressing.

just leave the gain at a level that isn't damaging to the woofer and see how you like it.

in a couple weeks if you don't like it, then start changing the box //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

That sounds like a great idea, but I'd hate to think of taking the top off once I seal it all up all nice. I did actually kinda want to be tuned at 33hz anyways.

Ok so the plan is...

Get the 1606D, but just run it at either a 4ohm load or a 1 ohm load with very low gain settings on the amp.

I will also add the (2) pcs in as shown in the above photo which should bring me down to 2.75 cubes @ 33hz.

I'm also going to make the cutout hole at 10.9", is this right Tommy?

Tommy, since I allready have this box made and the type R is on the way I'm gonna have to stick with it. The persons car that this is getting installed into has never had a system before and hasn't even heard decent bass. He should still be very happy with the output right?

I'm gonna be building another single 12" type R setup with the same amp in about 1 month, do you have a link for the Ultimate Box Design?

Thanks again for all your help guys //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[PV Audio 5,000+ posts]

I'm gonna be building another single 12" type R setup with the same amp in about 1 month, do you have a link for the Ultimate Box Design?

I'm afraid that there is no such thing as the ultimate box design. What's good to one person is not good to another.

 

[tommyk90 5,000+ posts]

That sounds like a great idea, but I'd hate to think of taking the top off once I seal it all up all nice. I did actually kinda want to be tuned at 33hz anyways.
Ok so the plan is...

Get the 1606D, but just run it at either a 4ohm load or a 1 ohm load with very low gain settings on the amp.

I will also add the (2) pcs in as shown in the above photo which should bring me down to 2.75 cubes @ 33hz.

I'm also going to make the cutout hole at 10.9", is this right Tommy?

Tommy, since I allready have this box made and the type R is on the way I'm gonna have to stick with it. The persons car that this is getting installed into has never had a system before and hasn't even heard decent bass. He should still be very happy with the output right?

I'm gonna be building another single 12" type R setup with the same amp in about 1 month, do you have a link for the Ultimate Box Design?

Thanks again for all your help guys //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Everything sounds good.

I mean, if things don't go as planned, then just build another box. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[SHiZNiLTi 10+ year member]

I got the sub friday...

I took everyones advice and went ahead and doubled up the inner part of the air port...

OMG does this the sub sound good in 2.75cubes at 33hz. I don't have the Hifonics 1606d yet so I took the finished product over to my buddies house and connected it to his JL 500/1 in the back of his 3 series.... the bass is very very low and clean, but I totally understand what you guys mean by "take it easy on the volume" and "that its gonna bottom out with more then 500 watts rms." Im begining to think that Im gonna hafta have the gains way way down on the 1606d. We were just playing some random crap on the radio actually listening to country music and the SQ sounded soo sweet. It actually was vibrating the window panes of his house 30 ft away. I'll make a video soon for you guys to check it out. Thanks again for your help.

I would been done faster, but this weekend I kinda drank too much...

 

[AphexTwin 10+ year member]

nice bar!

 

[SHiZNiLTi 10+ year member]

nice bar!

Thanks Bro, I made the counter myself and that rock fireplace I did by hand //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

 

[jklfd 10+ year member]

wow very nice house.

 

[Lil_KB 10+ year member]

nice box....my 12" Rs sound good at about 2.7 cubes a piece with about 1000W RMS going to each. I'm gonna try another enclosure with about 1.75 a piece and see how they do though.

 

[SHiZNiLTi 10+ year member]

nice box....my 12" Rs sound good at about 2.7 cubes a piece with about 1000W RMS going to each. I'm gonna try another enclosure with about 1.75 a piece and see how they do though.

Sweet!!! We need to stay in touch so I know how they sound in the different box. This box I just made is actually for a friend, I'm making mine very soon and am undecided on how to build it, but from what I heard tonight from this box design I hafta say I'm very impressed with 2.75 @ 33.

Are you using a 1206d per sub?