Hi all

Sorry bout all the questions lately, but I'll get to the end of em eventually!!

What are the pros/cons of mounting a sub 'basket out'? i.e. the sub is facing into the box with the basket hanging out.
The reason I ask is the subs Im looking at, have a very nice basket, and I thought it would be cool to show it off in a custom enclosure, and they are designed to be mounted that way if you want to.
Will the box size increase/decrease? Will the frequency response change at all? Any other things I should consider before I go ahead and do it?

Cheers
Pete

depends on the sub and the box
mine doesnt matter which way it goes, some like to have a big box wen they are turned back the other way, i like havin my basket out caz i got a big shiney chrome magnet :D

You could mount it normal with basket in box, rear load it and have a perspex window on the rear of the box that you can look into when you open the ski hole :D

Hey

yeah, i think tis a good idea if u have a bilngy basket and or magnet. I reverse mounted mine, because it would give me a slightly greater box volume. Another reason was my 15" sub wouldn't fit too well if the basket was inside the box, coz of the angle of the baffle.

Another good thing about it, is that it helps protect stuff stabbing the cone if i have stuff in the boot. You can't really damage the cone if u mount it ouside the box.

Just remember to reverse the wiring so - to + and vise versa.

the back of a DD2515
http://maccanet.net/gallery/albums/userpics/10003/normal_DSC03045.JPG :doubt:

:confused:
Why do you need to reverse wire it???

Pro's

If it has a Shiny Magnet and Cast it looks great
Increases Internal Box Volume.
allows more cooling to the Voice Coil and motor structure
Less chance of the cone being damaged



Cons..
Allows Dust to enter into Voice Coil and Motor Structure.
Requires a larger and more carefully designed enclosure as you have to allow for excursion and proper sealing.
No one see's the cones Pumping
Sometimes messier Wiring to the Sub that can ruin appearances
Metal objects can be attracted to the magnet
May not sound as good if not done properly.


Really there is no benefit to doing it apart from looks

:confused:
Why do you need to reverse wire it???

because u've mounted the sub exactly opposite to what you'd normally do, so the cone moves in the opposite direction.

to fix it, wire it the other way round :cool:

Yeah u have to reverse the polarity as has been said to keep in time with ur fronts.

Another con is sometimes you get noise which would usually be kept in the box. eg: waves passing through the basket itself.

Much of a muchness really. I think it takes up more space in the boot.

Facing the boot has proven to give you a few more DB`s.. dont know the tech sode to it though.. lol

Or do what i did get a big peice of perspex and make that the back and u will be able to see the basket anytime u want

Tom

yeah my subs are located right at the rear of my boot. So as yo open the boot my subs are right there. ive found it gives me MUCH more boomy sounding bass having them as far away from me as possible. Same as home theatre really.
:D

Thats right, cos it means the waves leaving the rear of the sub are almost in phase with the waves from the front of the sub as they reflect off your boot.

on the reverse polarity thing: my headunit has a setting to throw the Sub pre-out 180degrees out of phase to the main pre-outs.... so with that you would wire it as normal, and set the head unit sub-out to the 180 setting. Not all head units has this however.

There is basically no difference having your subs mounted basket out, apart from the backward wiring, and the fact you have more box volume which coule affect the way the sub sounds. In a sealed box, there shouldn't be very much change, but in a ported box there could be quite a big difference.

Ok, so Im using Im using winisp or wateva its called to calculate the box. But there is no option to specify that the sub is reverse mounted. Is there a spec that I need to state is '0' for sub volume or something? Cause I would assume its automatically including the sub volume in the calculations...?? Or do I have to work it all out manually?
Sealed I got a result of 52Hz @ -3dB
Ported I got a result of 35Hz @ -3dB
But the ported box was about 10ltrs bigger! Would it be worth going ported keeping in mind I want good SQ, not fussed about SPL?

For SQ, go sealed every time unless you know what you are doing.

Sealed boxes have a flatter response curve, ported boxes have a spike in level around the tuning frequency.
As eek will tell you, the ported boxes also can be a bit laggy if not designed right.

A sealed box also a smaller box, meaning you have more boot space. When using a sealed box, pay attention to getting an AIRTIGHT seal between the box and the speaker basket. I used silicone on mine to help seal it tight. Make sure you use acid free silicone, or your beskets may rust away.

For SQ, go sealed every time unless you know what you are doing.

Sealed boxes have a flatter response curve, ported boxes have a spike in level around the tuning frequency.
As eek will tell you, the ported boxes also can be a bit laggy if not designed right.

A sealed box also a smaller box, meaning you have more boot space. When using a sealed box, pay attention to getting an AIRTIGHT seal between the box and the speaker basket. I used silicone on mine to help seal it tight. Make sure you use acid free silicone, or your beskets may rust away.

hahaha ported boxes are the work of the devil.

OK, so it might go LOW and be all like....doOOOOof doof dof DOOOF DOOOOOOOOOFF, but it just isn't suited to my tastes.Yeah, u might turn heads when you're playing techno chicken dance songs, but yeah. I would like to get rid of my ported box.

It could also partly be because it was the first time I ever used any sort of power tools or even worked with MDF..and seeing as though ported boxes are extremely sensitive to box volume, mine is slightly off so sounds like poopoo. :doubt:

i reveresed mounted mine because it was alot easier to build :P

http://presstec.net/~jake/pics/R31_Skyline_1990/2004-10-18/small/IMG_0070.jpg


Go the sunday-job style boxes!