subwoofer in the cab mounting question

[Martijn]

i will be placing the logitech z 2300 subwoofer in my cab



the woofer will have its face to the back with its own grill to the outside of the cab

do i need to extend the bass reflex hole to the outside as well?

and any tips for mounting for less vibrating cab

i thought of mounting the sub on a mdf piece of wood with a rubber 1cm layer underneath it

[mountain]

You definitely want the the vent firing into the listening environment. I would fire the sub down through the botton and the vent out of the back. Secure the enclosure to the cab good or you will have nasty vibrations for sure.

[Martijn]

through the bottom is not possible as there is 2 mm space between the bottom piece and the floor

i could vent it through the side, but would ruin the sideart as its full spread art

can i vent it with a L shapped pipe and then outside of the cab ?

[mountain]

through the bottom is not possible as there is 2 mm space between the bottom piece and the floor

i could vent it through the side, but would ruin the sideart as its full spread art

can i vent it with a L shapped pipe and then outside of the cab ?

Absolutely. However, you can't simply extend the port. You will need to replace it with the same size and length. When measuring a bend, be sure to measure the center of the port to get an accurate measurement.

[Martijn]

how would a bend be possible then, as the pipe is not long enough to make the L corner and then its way out. If you say the pipe must be the same size

http://www.n-joymusic.nl/zelfbouw-bass-reflex-tubes-c-1420_1641.html?page=2&sort=products_sort_order

site where i can order some pipes

there is one angled version

another option i had in mind is the pipe going out of the floor piece

or putting the cab on foot pieces and still let the subwoofer go out the bottom and the bass reflex tube going out the back.

or the other way around

Your fantasy cab has a sub in the bottom, did you test it already ?
and what did you do with the reflex tube?

[extendedplayarcade]

Depending on what kind of sound you are looking for.  

If you are looking for Thumping (Kick drum Bass) type of bass I would point the subwoofer towards the internal cabinet wall and have the port vent out a whole in the back of the cabinet.  This will make the cone of the subwoofer travel more (back and forth) The wall that you the subwoofer firing towards I would glue a piece of egg crate foam.  To keep the accoustics sounding decent and not muddy (so you don't get that bass slap sound)

If you want less of a thump and deeper bass (jazzy type of bass) just turn the subwoofer out a vent through the back and have the port aiming towards the cabinet's inner wall.  This will keep the Subwoofer from moving as much and gives it more of a controlled bass.

Make sure everything is tight as well on your cabinet because with a subwoofer that size it is going to rattle your cabinet.  Especially your control panel.  You can line the cabinet with egg crate acustic foam to help just keep it away from all the components in your cabinet that get really HOT.  Like the power supply and monitor wire area.

Using a subwoofer and firing it downwards the floor would work and use the arcade cabinet as an enclosure works well for space.  So basicly you will have to buy a subwoofer at like radio shack or some place that runs at 8ohms.   Just like what they do with Pinball machines.

Remmeber you are putting an enclosed subwoofer into another enclosure.  Volume of air and cubic space all come into play when dealing with bass.

I can go on and on but hopefully what i said made sence.  I typed it out fast and didn't proof read it  

I would test it out and move it around before mounting it or cutting or what not.

[mountain]

If you are worried about sound quality, i.e. using this cab as a jukebox, DO NOT allow the sub or the port to enter the cabinet airspace.

If the length of the port won't let you add the bend, you may have to vent them out the back like this:



You will need to install a top on this as well. The idea is to keep the output of the sub from entering the cabinet. Install a grill and you will be golden.

On my Fantasy cab, the port was on the same plane as the sub (one of the reasons I bought it). I will have about 3 inches from the sub to floor and about 1 inch from the sides to the floor after installing the base. This ends up to around 115 square inchs for the bass to enter the listening area. I have tested the sound and it's good...real good. 

[Martijn]

some great ideas  Thanks

Ill do some test setups this weekend, as its not really a jukebox, but more a pounding arcade cab, the quality isn't very important, but to get the best out of this situation is a must 

The angled subwoofer in its on space is also a nice option, maybe i can also fill the inside with the spiked material ?

[mountain]

maybe i can also fill the inside with the spiked material ?

The angled idea is designed to keep the output of the sub from entering the inside of the cabinet. The acoustic foam would be a waist of money.

[extendedplayarcade]

If you are worried about sound quality, i.e. using this cab as a jukebox, DO NOT allow the sub or the port to enter the cabinet airspace.

If the length of the port won't let you add the bend, you may have to vent them out the back like this:



You will need to install a top on this as well. The idea is to keep the output of the sub from entering the cabinet. Install a grill and you will be golden.

On my Fantasy cab, the port was on the same plane as the sub (one of the reasons I bought it). I will have about 3 inches from the sub to floor and about 1 inch from the sides to the floor after installing the base. This ends up to around 115 square inchs for the bass to enter the listening area. I have tested the sound and it's good...real good. 

Nice Illustration.  That would work great too.  Might get the least amount of rattle in the cabinet that way.

Good thinking! 

[Martijn]

your idea worked fine mountain. i will work it out and put it to practice next week

thanks ! 

[mountain]

Cool! I will watch for pictures in your build thread 

[Martijn]

any tips for placing the sub on rubber material or something? to reduce more vibration?

[mountain]

If it doesn't already have some,  you may want to install some rubberized feet on the bottom and then attach it to the floor of the cab with an L-bracket in each corner.

[Martijn]

i was thinking the same thing

i have a nice grill laying around but i dont know if its to small for the back

grill size
Outside Ø
Ø 267mm
 Inside Ø
Ø 232mm

subwoofer size is
Subwoofer: 27,9 x 27,9 x 38,1  in cm
with a Subwoofer: 20,3-cm
 

[Blanka]

I think you better fire into the room directly. Nothing as bad as sending bass-waves to a wall. So if you intend to put the cab against a wall, do not vent there! Use the front for the speaker and maybe the side for the vent. Even better is to decase the Logitech, and construct the lower part of the cab as solid enclosed box, with the vent below or next to the speaker. Use a minimum of 18mm MDF for the box and glue all edges (no screws). Fill the box with dampening cloth and mount the speaker and the vent pipe. A Box in a box will give much more resonance.

[Martijn]

i have an angled backside



is that ok?

[mountain]

I think you better fire into the room directly. Nothing as bad as sending bass-waves to a wall. So if you intend to put the cab against a wall, do not vent there!

What!? Have you ever heard of "loading" a sub?

Martijn, several high end speaker designs fire the sub backwards. We're talking about an arcade machine here anyway. Your setup will sound great if done the way talked about. Instead of using a small pre-made grill, make one out of MDF the same size as your sub/vent opening and wrap it with grill cloth.

I am leaving to go on a long weekend getaway, let's see some progress when i get back 

 

[Blanka]

Yeah, but normally a sub is >50cm from the wall. 1m is even better. This cab does not look like standing 0.5m from the wall. Having a vent port 5cm from the wall sounds crap.

[Martijn]

I think you better fire into the room directly. Nothing as bad as sending bass-waves to a wall. So if you intend to put the cab against a wall, do not vent there!

What!? Have you ever heard of "loading" a sub?

Martijn, several high end speaker designs fire the sub backwards. We're talking about an arcade machine here anyway. Your setup will sound great if done the way talked about. Instead of using a small pre-made grill, make one out of MDF the same size as your sub/vent opening and wrap it with grill cloth.

I am leaving to go on a long weekend getaway, let's see some progress when i get back 

 

also possible, mountain speaker style

i will do something , if you say something nice in my project topic

[Martijn]

oh what size grill do you recommend

[Martijn]

the subwoofer is placed.

do i also need to cover the back?

[Visitor Q]

Good Post.

I am going with this same setup.

My question is this, do I have to worry about the bass affecting the computer components since the same space will be shared by my PC?

My setup...

http://www.mameroom.com/manuals/UAIIKit_Manual.pdf

http://www.mameroom.com/images/UAIICab27E4_lg.jpg

http://www.mameroom.com/images/UAIICab27E_Rear_lg.jpg

Space in the front is going to have a coin door.

Any ideas for me on mounting?

ps. Here is knievel's setup. Looks like he is just firing his setup out the front, no ports.

http://www.knievelkustoms.com/guitarherocabinet.htm

[Martijn]

i finished placing the sub

you can check the result here

http://forum.arcadecontrols.com/index.php?topic=84649.msg903336#msg903336

[Visitor Q]

 

[ArcadeBliss]

was it necessary to cover the back area of the subwoofer box?