i know in a hatch back pointing your sub up can make it hit better. if you point a sub up in a closed trunk....accord.....prelude....2000 SI....will it hit better?

 

point it towards the rear of the car.BIG gains can be found.i talked to a spraker manufacture and he said on SOME vehicles,he measuered up to a 5 db gain.in car amps you have to double your power just to get a 3 db gain.but point it different directions,every car is different.

 

About 99% of the time it will hit harder if you face it to the rear. This will however increase the rattle of the trunk outside of the car

 

It all depends on the car and the speaker/box. Seems like in (trunk) Hondas the best way to fire the subs in into the seat or fold down the seat. Reason? because the car will rattle and sound like crap if you face it otherways. Although this way is the quietest. Its a trade off. Just play around with it and you'll find the sound that suits you the best. Good Luck

 

I spend like 3 hours testing this, Civic sedan, sealed box, if you let the seat down, and point the sub towards the rear it trunk acts like a second box and funnels the sound right to you, better SQ SPL but it does cause the ol licence place to rattle a bit.

 

Varies for every box and car. Try some different positions and see which one she likes. The box that is.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Race Ist &raquo;</TD></TR><TR><TD CLASS="quote">i know in a hatch back pointing your sub up can make it hit better. if you point a sub up in a closed trunk....accord.....prelude....2000 SI....will it hit better?</TD></TR></TABLE>

Towards the rear of the car. If you are worried about trunk rattle you can always buy that sound padding stuff ( not sure what it's called ) that will reduce rattle when you put it in the inner of the trunk. IMO this gives it a better thud...

 

depending on the size of the subs etc, there is a good distance you have to set it. What happens is the back half of the wave will travel towards the driver's seat, while the front half will bounce off the trunk and reflect towards the driver. What you need to do is position the box just the right amount from the rear so that the back half and reflected waves match, which will give you a boost in amplitude

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rjr162 &raquo;</TD></TR><TR><TD CLASS="quote">depending on the size of the subs etc, there is a good distance you have to set it. What happens is the back half of the wave will travel towards the driver's seat, while the front half will bounce off the trunk and reflect towards the driver. What you need to do is position the box just the right amount from the rear so that the back half and reflected waves match, which will give you a boost in amplitude</TD></TR></TABLE>

that is it!! it's called bass wave coupling, also certain frequencies may be louder than others depending on the dimensions of the car, the lower the bass the longer the wave is, so the frequency associated with the lenth of the car will seem louder, and really cause the car to vibrate it's called resonance, or resonant frequency

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civic disobedience &raquo;</TD></TR><TR><TD CLASS="quote">

that is it!! it's called bass wave coupling, also certain frequencies may be louder than others depending on the dimensions of the car, the lower the bass the longer the wave is, so the frequency associated with the lenth of the car will seem louder, and really cause the car to vibrate it's called resonance, or resonant frequency</TD></TR></TABLE>

that confused me but i strangely feel smarter good info

 

I went to school for audio engineering, and learned all that kind of stuff in my "physics of acoustics and sound" class, it is a lot easyer to understand with a few sketches on the ol blackboard, but I tried my best

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civic disobedience &raquo;</TD></TR><TR><TD CLASS="quote">
so the frequency associated with the lenth of the car will seem louder, and really cause the car to vibrate it's called resonance, or resonant frequency</TD></TR></TABLE>

Yes, and some high end compitition amps actually have either a special filter with a super steep roll-off that blocks that small range, or shifts the frequency slightly to keep the car from vibrating as bad

 

Dynamat.... Did the work for me....... all over the trunk.

 

Yeah, you can pretty much find Dynamat anywhere. they make special trunk kits...its not really that expensive. depending on how much you use, it shouldn't cost more than a few bills...

 

so how close is too close in a civic trunk? should I have like 10 inches or more from the back? or just a few.... also what if it was like 2 feet away?

 

well the postion you point a sub is important to where you want the waves to travel. it is good to face a sub up or even on an upward angle in a hatchback because the waves will bounce off the rear glass and hit the driver.

now the thing about sound waves is it takes about 8 feet of distance (if i remember my audio school right) to make a complete wave hit your head.

it is better to face a sub towards the rear in a trunk because the waves will be able to bounce off the back of the trunk and then shoot toward the driver giving you that proper distance for the wave to complete.

i hope that helps a little

 

yeah, but is there a minimum distance the sub should be from the back of the trunk?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Race Ist &raquo;</TD></TR><TR><TD CLASS="quote">i know in a hatch back pointing your sub up can make it hit better. if you point a sub up in a closed trunk....accord.....prelude....2000 SI....will it hit better?</TD></TR></TABLE> The best advice is to move the box around till you get the sound you like, each way you point the subs and how far away it is from a suface will make a diff. in how the bass sounds, some are small , some are huge, don't forget to switch the phase of the sub each time you move it, try both in and out of phase.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by menace1930 &raquo;</TD></TR><TR><TD CLASS="quote">well the postion you point a sub is important to where you want the waves to travel. it is good to face a sub up or even on an upward angle in a hatchback because the waves will bounce off the rear glass and hit the driver.

now the thing about sound waves is it takes about 8 feet of distance (if i remember my audio school right) to make a complete wave hit your head.

it is better to face a sub towards the rear in a trunk because the waves will be able to bounce off the back of the trunk and then shoot toward the driver giving you that proper distance for the wave to complete.

i hope that helps a little</TD></TR></TABLE> Huh? I think if you check, you will find that a low frequency wave [sub bass] is a hell of a lot longer then 8 ft, eg. at 20 Hz the "wavelenth" is 56 feet long. 94

 

ive always pushed mine as far back as spossible and always worked great. gives the waves more room to do what they gotta do , plus gives you space to store **** if needed.