hi all, got a couple of pic of my new subs,SPL DYNAMICS PRO300D2,they sound awesome,setup is only temporary atm as new box is being built,25mm mdf, those who know the car my second amp is back at the shop after i blew it up, looks like warranty (hope so).everything will be up and ready for comp in maitland on the 20th followed by dorans the following weekend.

cheers rohan
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Looks great man!! Can't wait to see some scores, i have a feeling your going to beat your P.B

hope so thats the whole idea of the game.doing a test tomorrow see how they go

so how did the test go, who is building your box? you might win the next comp, stich had problems at pro sound and only got in the 139's.

very happy with test,anthony is building my new box of course. see you at steamfest comp

you will and i'll have some new toys i'll be testing

hmm looks good any numbers yet?

no yet will post new box and numbers after comp on 20th

hi all,got some more pics of new system.threw it in the car 1 hr before the comp last sunday no tuning guessing frequency got 141 with room to move.will do a thorough test and tune before dorans.
cheers rohan

thats a good start, would of put the port between the subs and you need to get some flare!!!

X 2 on the flare

found the problem with why you may have been disappointed with ya first results. after seeing that box i see why.

thats to much port for that enclosure, and in the wrong spot.

do a new baffle and ditch the two ports and run just one flared port in the centre of the two subs. or build another baffle with a slot port at the side.

my advise is build a baffle with a single flared port between both the subs and also build a baffle that allows for a slot port (then test both of them)
after you have tested both just glue in the one that works best.

but yeah that baffle set-up you have there isnt the way i would of done it.

but anyway give us a buzz when you get the chance Rohan or can chat more at dorans.



cheers billy

lol your joking right?

no im not joking ROO.

Devinchi and myself both agree those two ports would be hindering the scores and are two big. one single 4'' or 6'' port would be far better..

the box also is some 5 cube. way to big for those subs. 2.8 cube to 3 cube max would be best for them.

but yes im not joking

just asking why would port size matter, as long as it is tuned to a frequency and the subs have the same amount of volume didnt think it would matter unless the port is to small.

5cubes should be using 2 6inch aeros, not a 6inch or a 4inch. if you do some testing you will find that bigger ports bring bigger numbers. have you seen georges car??i think thats box is around a 5cube with a 9inch aeroport but he is only doing 155s so you think he should swap that out for a 6inch? might get that extra db or 2 out of it

im not having a go at you but when you feed all these people the wrong information it doesnt help the number go up then they lost interest in spl

Roo

Let him change the box. If his score goes down, billy owes you a coke

if he keeps that same box, cuts a new braffle puts a single 6 or 4 inch the score "should" go down, but im not sure how he tunned it so it could increase because of new tunning

with that score I would say that the tunning is incorrect, but i dont know the specs of the box or the port tunning

yes george has alot of port and he also has alot of power to that set up Rohan doesn't have alot of power so a smaller box and 1 x 6" aero and it will be louder or even an bandpass box would produce a higher reading on his power

I work on a minimum port area of 12 sq in per cubic foot ideal is about 16 sq in per cube, we did some testing in Brads colt with my APX10s 2.65 cube box net 152.5 with a 6" aero tuned to 57 and 153.1 same box with one of my 6.75" aeros tuned to 57.
I would suggest a 3 cube (before displacement) with a 6" aero would be a good starting point for the SPLs.

very interesting discussion.i spoke to leo on the phone at length on sat night about this setup.i am doing testing today so i will post some figures then.

A 6" port is 18.8sqin, so he has a total of 37.6sqin for a 5cuft box

6 inch port is 28.26sq inches


as roo said add some flare to the ports

smaller box too

hi all, thanks to all for input makes learning easier.did some testing today got regular 143's will look at some changes to box after dorans., as i have no time to do it this week.

One 4" for two twelves?

No

No

NO!

Phil

Two 6s would be good, or a single large aeroport ideal. I've seen a single 6" port per 10" sub and it worked very well..

x2

Really depends on the car.....

Is it the one in your sig?

Phil

Ford Festiva. Same model as Steves old one.

What CAR?????
What SUBS??????
What AMP(s)??????
What SCORE Did it do???????

Not trying to sound cocky or a know it all but this is a loud Street A car from the States, I don't know a hell of a lot about it just dimensions and box placement. From what I was told it had two Z1s and a pair of 95s. Was good for 156dBs. Two seperate enclosures, one 6" aeroport per sub. Getting pics of loud boxes is pretty hard as nobody wants to share much in street classes. These are the pics I was given..

6 inch port is 28.26sq inches

i'm sorry, you are right miss calculation to many numbers going through my head at the moment

no probs, ah CRX have seen those pics around before.

but anyway afterall the Festiva was doing 143's with 2x Jaycar 10's in it off the same power its using now so i cant see why it cant do 145's now;).

but good luck with it Rohan you will get there im sure of it


cheers billy

just finished new box. how does this look

looks better but still got a piss small port, is there any length to the port? how big is the box?

Hmm interesting.

Did it gain?

box is 3.6 cubes port is 3 " long,didn't finish till late last night testing and comp today hopefully beter numbers

Looks like a 4" port? Get some more flare going on and if it's a 6" add at least another 3-4" to the length.

port looks to small now.

and needs about 6'' of length.

but anyway let us know how ya go rohan.

yes i know guys i stuffed up had 2 lots of measurements on a bit of paper, lost the paper, and got the port lengths mixed up.i know it sould be 7".will correct it and do some serious tuning before syd autosalon.
cheers rohan

What did you score?

only got 140.2 bcause the port was wrong i was using the wrong freq.but it is all part of the learning curve

Bad day for us hey spoon

is that daves ?

Nah. But the design is the same. Works very well!