Menu
Forum
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Car Audio Discussion
General Car Audio
Car Audio Build Logs
Car Audio Equipment
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Help
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Car Audio Classifieds
Car Audio Wanted
Classifieds Member Feedback
Gallery
New media
New comments
Search media
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Log in / Join
Test
Forum
Search
Search titles only
Search titles only
Log in / Join
Search
Search titles only
Search titles only
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Menu
Reply to thread
Forum
Car Audio Help
Wiring, Electrical & Installation
Can we stop saying "box rise"? Explanation/rant
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="jt4x4" data-source="post: 8725195" data-attributes="member: 677386"><p>I was reluctant to start this thread because I am confident in my relative knowledge of electricity but not acoustics. I expected to be flamed by those more familiar with acoustics and pressure. Total impedance HAS to (in my mind) include electrical resistance as well as physical resistance. When I hear people say "box rise", I equate it to a pump or a fan driven by an electric motor, because that is what I focus on in my profession. A fan motor or a pump motor uses a given amount of electricity without a load, but uses more electricity based on how much water or air is incoming verses how much is outgoing. Similarly, if a space is already pressurized, it's going to take more power to further-pressurize it, which is what a speaker does when it extends into that space. I'd also expect speakers to bottom-out easier in spaces with higher air pressure. So given that theory, SPL's should be relative to elevation, since air is thinner when you get further from Earth.</p><p></p><p>I'm speculating here, and I'm probably wrong, but I like what Buck started with thinking out loud. It's fun to learn!</p></blockquote><p></p>
[QUOTE="jt4x4, post: 8725195, member: 677386"] I was reluctant to start this thread because I am confident in my relative knowledge of electricity but not acoustics. I expected to be flamed by those more familiar with acoustics and pressure. Total impedance HAS to (in my mind) include electrical resistance as well as physical resistance. When I hear people say "box rise", I equate it to a pump or a fan driven by an electric motor, because that is what I focus on in my profession. A fan motor or a pump motor uses a given amount of electricity without a load, but uses more electricity based on how much water or air is incoming verses how much is outgoing. Similarly, if a space is already pressurized, it's going to take more power to further-pressurize it, which is what a speaker does when it extends into that space. I'd also expect speakers to bottom-out easier in spaces with higher air pressure. So given that theory, SPL's should be relative to elevation, since air is thinner when you get further from Earth. I'm speculating here, and I'm probably wrong, but I like what Buck started with thinking out loud. It's fun to learn! [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Help
Wiring, Electrical & Installation
Can we stop saying "box rise"? Explanation/rant
Top
Menu
Home
Refresh