[noidaboy]

checking out the various ice installs i have noticed people install reverse woofers...does is make a diffrence?? wats the funda behind it

[navin]

Originally Posted by noidaboy

checking out the various ice installs i have noticed people install reverse woofers...does is make a diffrence?? wats the funda behind it

what do you mean by reverse woofers?

[mclaren1885]

Meaning the subs mounted the other way. Like this

[noidaboy]

Originally Posted by mclaren1885

Meaning the subs mounted the other way. Like this

thanx 4 this picture buddy...

yeah this is what i want to knw... whats the point of such installs??

[hydrashok]

Originally Posted by noidaboy

thanx 4 this picture buddy...
whats the point of such installs??

Show, show & show! Most Audiobahn subs get mounted this way, to show off all that chrome on the frame and the magnet.

No difference in sound by mounting them this way.

This kind of install maybe necessary in some (rare) cases where the enclosure volume is lesser than the volume of the driver (the part that goes into the enclosure) or where the volume is so small that the driver cannot be installed in the normal way. The two Kicx subs in EVO's TT are a good example of this.

EDIT: I guess mounting them in reverse does keep them cooler (esp. vis-a-vis a sealed enclosure), but I don't think this really is a serious criteria.

[kpzen]

I think EVO6 has inverted subs in his Audi TT....Can find the pics now!!

Originally Posted by hydrashok

No difference in sound by mounting them this way.

How come?? All the parameters will change na....
Will it sound same as a sub in a ported box.....?

[hydrashok]

Originally Posted by kpzen

How come?? All the parameters will change na....
Will it sound same as a sub in a ported box.....?

Nope. Nothing changes. Except that, if the enclosure volume specified by the manufacturer includes the displacement of the magnet & frame and stuff, that displacement must be reduced from the final enclosure volume while mounting the subs in an inverted way.

Using an inverted sub with a ported enclosure is likely to be a beeeatch. Don't ask me why, I have no solid reason to give -- just a feeling. Too much math is going to be involved there (the enclosure will most likely be fiberglass and without a single measurable edge), and I wouldn't want to do any of that calculation if my life depended on it.

One problem that is likely to be there is that, if somebody is sitting close to the inverted sub, he is likely to hear a lot of slapping (?) type sound of the movement of the cone and spider and stuff. Again, this would depend on the build quality of the sub (there, I've said the 'B' word) and a really well put together sub may not make this mechanical noise.

All that inverting a sub involves is wiring the sub out of phase. If the amp has a reverse-phase switch that would also do, I think.

[kpzen]

Anoop.!
Thanks for explaining !
Now for the calculation thing i'll catch LBM


Off topic: Have u used fibre wool inside your sub box? I heard using it gives more low bass from the Sub....Is it true?
Sorry for pestering u....Just clearing my doubts

[hydrashok]

Nawww...

I have used a bit of polyfill in my box, though it is built to specs. It sounds good to me, so I haven't uh, argued the use.

Polyfill is used to make the sub driver think it is in a larger box than it is actually in. This does make the output sound a bit deeper. (But I personally don't understand why a box built to specs needs polyfill, as the driver gets exactly the enclosure volume it needs). I'm sure polyfill really helps when we are not able to build a box (due to space issues in the car) as large as a sub-driver needs. Then, we can build a slightly smaller box (as large as the space allows) and use polyfill to fool the driver into thinking it is in a bigger box (of about the specs it really needs). But this I guess, would need a lot of experimentation to get it right. And again there must be a limit to which polyfill can held compensate for box-size.

And as I understand (damn, all that I know is theoretical, 2nd hand knowledge) polyfill helps more in a ported box, than in a sealed box. Basically because the ported boxes (for the same driver) are bigger than a sealed box, and considering the usually tight available space in our cars, we need to really con the sub-driver into seeing a bigger box. And I've also heard that polyfill also helps reduce port-whistle (I guess, by damping/slowing down the air movement caused by the back-wave).

And yes, I guess l_b_m can do all that calculation-giri with one hand tied to his back

[noidaboy]

but having woofers magnets facing each other..wud have some bad effect or something???

what kind of box's are prefferd for maximum bass??

[navin]

Originally Posted by noidaboy

but having woofers magnets facing each other..wud have some bad effect or something???

what kind of box's are prefferd for maximum bass??

a) woofer magnets are too far apart and besides their magnetic field is concentrated towards the pole piece.

b) Box size and type depends on the T/S specs of the woofer.

[Mugen_Power]

I have installed reversed sub woofers in my innova right now. I tried both way but i do not feel the difference in sound.
May be it depends upon brand and show off.

[noidaboy]

Originally Posted by navin

a) woofer magnets are too far apart and besides their magnetic field is concentrated towards the pole piece.

b) Box size and type depends on the T/S specs of the woofer.

dvc


i have 2 pioneer 306 dvc's currently installd.what kind of box will be suggested best for them

[navin]

Are they 306C or 306F?

[noidaboy]

Originally Posted by navin

Are they 306C or 306F?

They are pioneer 306dvc. i will post the pic as soon as i can