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="hispls" data-source="post: 8724752" data-attributes="member: 614752"><p>In the past it has definitely been worth knowing what impedance is at your burp frequency to plan coils and amps accordingly, these days possibly less important for most folks considering how cheap we can buy full bridge power. My first 150+ was running my old JBL/Crown A6000 into """1.4 ohm""" while in 4 ohm mode. I had determined that impedance at my peak was actually about 6 ohms with that sub/box/vehicle and that it was safe. For reference, I gained nearly 5dB over daily configuration running that same sub/box at 6 ohm nominal.</p><p></p><p>Also want to point out that IF you know sub and box specs you should be able to predict impedance at any given frequency since every variable can be converted into ohms, henrys or farrads, but for practical purposes, using a constant voltage source and measuring current and doing the math is probably best. Or to shortcut that, Dayton DATS will give you an impedance graph in a couple seconds.</p><p>[ATTACH=full]24702[/ATTACH]</p><p></p><p></p><p>Some googling can break down which variables are what.</p><p></p><p>Also output from Dayton DATS. This is the wall in my Jeep wired to .7 ohm nominal</p><p>[ATTACH=full]24703[/ATTACH]</p></blockquote><p></p>
[QUOTE="hispls, post: 8724752, member: 614752"] In the past it has definitely been worth knowing what impedance is at your burp frequency to plan coils and amps accordingly, these days possibly less important for most folks considering how cheap we can buy full bridge power. My first 150+ was running my old JBL/Crown A6000 into """1.4 ohm""" while in 4 ohm mode. I had determined that impedance at my peak was actually about 6 ohms with that sub/box/vehicle and that it was safe. For reference, I gained nearly 5dB over daily configuration running that same sub/box at 6 ohm nominal. Also want to point out that IF you know sub and box specs you should be able to predict impedance at any given frequency since every variable can be converted into ohms, henrys or farrads, but for practical purposes, using a constant voltage source and measuring current and doing the math is probably best. Or to shortcut that, Dayton DATS will give you an impedance graph in a couple seconds. [ATTACH type="full" alt="24702"]24702[/ATTACH] Some googling can break down which variables are what. Also output from Dayton DATS. This is the wall in my Jeep wired to .7 ohm nominal [ATTACH type="full" alt="24703"]24703[/ATTACH] [/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