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
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
How to determine current draw for 5 channel amp?
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="n2audio" data-source="post: 8682973" data-attributes="member: 540940"><p>It's a much more complicated answer than it seems...</p><p>Yes, it has 80A fuses, but fuses are a long way from actual current draw when in use -- besides, fuses take time to heat up and open. That's beside the point.</p><p></p><p>On the surface -- it can produce 900w rms at min impedance. Digging a little deeper -- being class D assume it's ~80% efficient. So to get 900w out, 1100w+ would have to go in.</p><p>Then assume you'll get ~13v from your alternator. Power/Voltage = current -- That's 86A.</p><p></p><p>Then there's the issue of what signal you're playing. That amp will only approach 86A on a constant basis if you're playing test tones at full volume. </p><p>Actual power output of the amp will vary drastically depending on music type and volume. Some music only requires 25-30% test tone power. There's NO music that will get you close to max current draw constantly. However, you will likely see momentary spikes that high at high volume.</p><p></p><p>With all that in mind -- At low to mid volume, I'd guess ~20-25A. Mid-high volume, 30-50A.</p><p></p><p>A while back I was having elect probs in my car. The auto elect specialist immediately assumed my system was the cause. They hooked up a professional quality meter on the power lead to my amps (1200w rms). I put in Bass Mekanik and blasted it. It was drawing 50-60A.</p></blockquote><p></p>
[QUOTE="n2audio, post: 8682973, member: 540940"] It's a much more complicated answer than it seems... Yes, it has 80A fuses, but fuses are a long way from actual current draw when in use -- besides, fuses take time to heat up and open. That's beside the point. On the surface -- it can produce 900w rms at min impedance. Digging a little deeper -- being class D assume it's ~80% efficient. So to get 900w out, 1100w+ would have to go in. Then assume you'll get ~13v from your alternator. Power/Voltage = current -- That's 86A. Then there's the issue of what signal you're playing. That amp will only approach 86A on a constant basis if you're playing test tones at full volume. Actual power output of the amp will vary drastically depending on music type and volume. Some music only requires 25-30% test tone power. There's NO music that will get you close to max current draw constantly. However, you will likely see momentary spikes that high at high volume. With all that in mind -- At low to mid volume, I'd guess ~20-25A. Mid-high volume, 30-50A. A while back I was having elect probs in my car. The auto elect specialist immediately assumed my system was the cause. They hooked up a professional quality meter on the power lead to my amps (1200w rms). I put in Bass Mekanik and blasted it. It was drawing 50-60A. [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Help
Wiring, Electrical & Installation
How to determine current draw for 5 channel amp?
Top
Menu
Home
Refresh