Subs questions

[Nocturnall]

Is it normal for subs to hit harder and be louder the closer you put it to one of the sides of the cargo area. If I take my box and put it right up against the hatch then it's damn loud but if it's not right up against it's still loud but not as loud. Same thing if I put it against the driver side wheel well. I have a sealed enclosure with 2 10 inch xtants and a 400watt kicker amp.

[koolwhipman]

Yeah, nothing unusual about that. Things like loading and cancellation make box position something you have to play with. Is the box made for the speaker? did you try pointing them up?

[toypaseo]

Might want to experiment with placing the back of the box against the rear seat, with the subs firing toward the rear.

This might have something to do with "cabin gain".

[expo5.0]

yes, this is normal.

experiement!

usually the loudest in an explorer (to the ear) is firing up. while firing to the rear is loudest to a mic.

[scootr2200]

How loud is a downfire type box compared to one that is upfiring?

Mickey

[expo5.0]

not loud at all really

however, at times it can seem louder than it is because of vibrating the floor

[Wagonized]

Originally Posted by expo5.0

yes, this is normal.

experiement!

usually the loudest in an explorer (to the ear) is firing up. while firing to the rear is loudest to a mic.

depends if you're talking about sub direction or port direction.

sealed boxes have no place in spl unless they're inside a ported box

[DOZIER]

I guess I have the best of both worlds then...Subs up port rear.

[Nocturnall]

I tried facing them up and it actually seemed quieter. Sadly the box I have is not made for the subs. These subs are some old xtants and I can't really find any information on them so I just bought a box from circuit city.

I've been running my subs against the rear seat firing backwards, I just recently started running them an inch from the rear hatch. My thought was since they sound best like that should I maybe attack a peice of 1/4 inch or 1/2 inch mdf to the front of the box 2 inches from the front of it? I'd rather not have the subs right against the hatch if I can and putting a board like that would somewhat protect the subs...

[expo5.0]

don't do that

[Wagonized]

Originally Posted by CPL DOZIER

I guess I have the best of both worlds then...Subs up port rear.

yup thats often the loudest....not always though

[Nocturnall]

Why do I not want to do that?

[koolwhipman]

Having them at the rear like you said gives you "gain" from the sound going up the back hatch and then coming at you along the roof. if you wanted to put a board in front of them and make it work similar, you would have to have it go to the roof and then it wouldn't be the same travel path for your waves(as by the hatch door) so it could actually be worse.

[Wagonized]

Originally Posted by koolwhipman

Having them at the rear like you said gives you "gain" from the sound going up the back hatch and then coming at you along the roof. if you wanted to put a board in front of them and make it work similar, you would have to have it go to the roof and then it wouldn't be the same travel path for your waves(as by the hatch door) so it could actually be worse.

it totally totally depends. Ur assuming that theres no cancellation in the vehicle aswell.


It doesnt take more than a few seconds to flip the box and listen to it that way. You can also try it pointed to the side. either one

[koolwhipman]

Originally Posted by Wagonized

it totally totally depends. Ur assuming that theres no cancellation in the vehicle aswell.


It doesnt take more than a few seconds to flip the box and listen to it that way. You can also try it pointed to the side. either one

Yeah Yeah. It all come down to EXPERIMENT. I have had the same speaker in three totally different boxes in the last month. I have noticed many things change from box to box and position to position. There is no replacement for experience, yours or someone elses.

[davesexplorer]

I've seen differences from truck to truck so experiment.

[Wagonized]

Originally Posted by davesexplorer

I've seen differences from truck to truck so experiment.

exactly. no two trucks are the same.

some of the hardcore canadian competitors went shopping locally for a crx and brought with them a battery bank with a couple amps and a crx box of some sort. And their mic of course

They noticed between 5 crx's that there was something like 0.9 db difference and 5 hz difference in peak frequencies.

[davesexplorer]

I know my old sport was a "hole" for spl, peaked no higher than 44hzish. As a test I put my consistent 149.9 t/l-152.8 AC setup in a friends truck (95 exploder sport), wouldn't you know it busted a 154.1 on the AC same freq played everything similar, a little different location in the rear but still... (given the AC mic has a lil bit less accuracy...)

[Wagonized]

Originally Posted by davesexplorer

I know my old sport was a "hole" for spl, peaked no higher than 44hzish. As a test I put my consistent 149.9 t/l-152.8 AC setup in a friends truck (95 exploder sport), wouldn't you know it busted a 154.1 on the AC same freq played everything similar, a little different location in the rear but still... (given the AC mic has a lil bit less accuracy...)

its not that the ac mic is less accurate its just less consistent because your setup is less consisent. AC190 measures peak spl at your loudest frequency while the TL averages your top SPL in your loudest 3 frequencies. So if the ac190 score (loudest frequency) increases 1.5 db your TL score will only increase 0.5 db providing your SPL stays the same at your other two loudest frequencies.

Where it gets interesting is when your TL score is higher than your AC190 score...figure that one out.

[Nocturnall]

Spl?