Menu
Forum
General Car Audio
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Build Logs
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Home Audio
Off-topic Discussion
The Lounge
What's new
Search forums
Gallery
New media
New comments
Search media
Members
Registered members
Current visitors
Classifieds Member Feedback
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Log in / Register
Forum
Search
Search titles and first posts only
Search titles only
Search titles and first posts only
Search titles only
Log in / Join
What’s new
Search
Search titles and first posts only
Search titles only
Search titles and first posts only
Search titles only
General Car Audio
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Build Logs
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Home Audio
Off-topic Discussion
The Lounge
What's new
Search forums
Menu
Reply to thread
Forum
Car Audio Discussion
Subwoofers
want more bass? .... then open your sunroof!
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="Kyle_Keating" data-source="post: 4880371" data-attributes="member: 582385"><p>this is just all room response theory. In fact, you REALLY dont want to role a window down or open a sunroof.. what that tells you is that you're mic (listening position) is in a Null and you have standing wave cancellation there. Its of course frequency dependant. Damping can help with a lot of that, but not really practical to put fiberglass all over the car... opening the window or the roof is actually the best form of dampening because its basically like 100% damping for that section of your car because the wave never comes back! Of course if you apply that theory to the entire car, you will have no car and your SPL will be a lot lower! the walls really do increase the SPL a lot so yo know when you're getting rid of the walls and your SPL is increasing..... you have some "room response" issues //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif trust me, every car has this problem.</p><p></p><p>There is also another phenomena that occurs. This one is a bit more interesting... the car can actually be treated like another box and a big one at that. when you crack a window or a sunroof you inertly creates a filter via resonator (i don't really know what type of transfer function it is, low pass or high pass), but the air in the car is the box and the surface area of the window is the port area of the resonator. the window thickness is the port length (not very thick) but because the air volume of the car is so large, you can still achieve a very low tuning and resonate the air mass in the car. the area of the window effectively becomes the piston for the subwoofer and it can indeed push a lot of air....when you find that resonance you can do something like a hair trick effect..... but when you realize all that is is a simulate port using the car... its much less impressive //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p></blockquote><p></p>
[QUOTE="Kyle_Keating, post: 4880371, member: 582385"] this is just all room response theory. In fact, you REALLY dont want to role a window down or open a sunroof.. what that tells you is that you're mic (listening position) is in a Null and you have standing wave cancellation there. Its of course frequency dependant. Damping can help with a lot of that, but not really practical to put fiberglass all over the car... opening the window or the roof is actually the best form of dampening because its basically like 100% damping for that section of your car because the wave never comes back! Of course if you apply that theory to the entire car, you will have no car and your SPL will be a lot lower! the walls really do increase the SPL a lot so yo know when you're getting rid of the walls and your SPL is increasing..... you have some "room response" issues [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] trust me, every car has this problem. There is also another phenomena that occurs. This one is a bit more interesting... the car can actually be treated like another box and a big one at that. when you crack a window or a sunroof you inertly creates a filter via resonator (i don't really know what type of transfer function it is, low pass or high pass), but the air in the car is the box and the surface area of the window is the port area of the resonator. the window thickness is the port length (not very thick) but because the air volume of the car is so large, you can still achieve a very low tuning and resonate the air mass in the car. the area of the window effectively becomes the piston for the subwoofer and it can indeed push a lot of air....when you find that resonance you can do something like a hair trick effect..... but when you realize all that is is a simulate port using the car... its much less impressive [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Discussion
Subwoofers
want more bass? .... then open your sunroof!
Top
Menu
What's new
Forum list
