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View Full Version : Please help with a Moe Lester box & port



SLIM3001
02-06-2007, 10:34 AM
Hi guys Right i have been working on a box in BBP6 and i was about to ask for some help when i found Moe Lester box's the one box he has is the same spec i was working on. But the port in his pic dont look right to me.

( PLEASE NOTE IM NEW SO COULD BE REALY WRONG )

I say the becouse the port is 2.5 wide but when you get the the top part of the port it then become 2.127 are somthing like that. I was told you need the port to have the same amout of space along the box ?.

All so in BBP it say's a need a port thats 24inch in Lenght but the Moe Lester box the port is only 18 inch long

This is the box im going to use
http://img23.imageshack.us/img23/3493/295cubes34hz3625sqin2dd.png

The port cut list dont seem to work out right in BBP the port is coming out at like 38hz so im a bit lost


PS sorry to Moe Lester not trying to say ure stuff is wrong as im only going BBP and its not adding up

momuzykent
02-06-2007, 10:58 AM
port looks to be 2.5in to me. are you taking into account thickness of wood??

vladd
02-06-2007, 11:03 AM
bbp ***** for ports, don't even bother, just see if the length and area of the port are correct for the tuning you desire, if so, make it

SLIM3001
02-06-2007, 11:09 AM
Yer 18 mm mdf
So start with the front baffle 0.709 inch add 10.25 + 2end port 0.709 =11.668

15 - 11.668 = 3.332 then take the back of 3.332 - 0.709 = 2.623 so tha's like
1.23 inch over sized. But as i say im new to working out the box cut's and i only go from BBP

SLIM3001
02-06-2007, 11:15 AM
bbp ***** for ports, don't even bother, just see if the length and area of the port are correct for the tuning you desire, if so, make it


Yer that's true but ure still ment to keep the port the same size so im told.
So its 2.5 wide on both side's

rpfuror
02-06-2007, 11:37 AM
That design is accurate based on 3/4” wood..

Here how it flows:
.75 (thickness front panel) + 10.25 ( 1st port wall) + .75 (thickness of port 2) = 11.75

15.00 (port side) - .75 (thickness of back panel) – 11.75 (from above) = 2.5 <- width of your port.

SLIM3001
02-06-2007, 11:40 AM
so its all the same size right and its tuned to just under 35 hz ?

So thats cool as i say im new dont know much so wanted to ask

SLIM3001
02-06-2007, 01:15 PM
That design is accurate based on 3/4” wood..

Thats 18mm right ? if not then how much out will the box be using 18mm mdf?

jeepintn
02-06-2007, 04:15 PM
and the length may look wrong to u if you simply add up the lengths of the pieces of wood to make the port, but u measure a port through the center, even in the bend, notice the red colored measurements in the center of the port on moe's design

SLIM3001
02-06-2007, 04:46 PM
Oh ok did not know that
( rpfuror ) Say's that design is accurate based on 3/4” wood the .75 =19mm but i cant get 19mm i will be using 18mm .709
how much out you think the tuning will be

PV Audio
02-06-2007, 05:03 PM
18mm is basically the same as 19mm. Most designs are exchangeable. :)

SLIM3001
02-06-2007, 05:24 PM
cool then keep ure eye's open for a new log with pic's of only my secend box lol the first 1 i did was crap lol