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<blockquote data-quote="Phreaker" data-source="post: 2153015" data-attributes="member: 567899"><p>What do you want to do,bench the amp to see what it's putting out at a given impedence at 14.4v (car on) or at 12.5v (car off acc. on)?</p><p></p><p>If you want to find what the amp is pushing at say 1 ohm with a 14.4v power supply then just hook up the DMM and the Clamp meter.</p><p></p><p>I saw a thread the other day that explained how to use the DMM and Clamp meter.</p><p></p><p>I think you use the clamp meter on your amps power wire where it connects to the amp and it reads the Current or amperes.</p><p></p><p>I believe you set the DMM to AC volts.</p><p></p><p>If your subs are wired to your amp at 1 ohm cool but remember impedence rise from box so what you measure may not be a true 1 ohm impedence.</p><p></p><p>Take the reading from the calmp meter and the DMM at the same time.</p><p></p><p>Multiply the amperes by the volts</p><p></p><p>example 40v x 100amperes = 4000w</p><p></p><p>Do the same thing to find the amps output with 12.5 volts power supply by turning the car off and only having the ACC. on.</p><p></p><p>Remember also to have your HU's volume up to it's max unclipped volume when taking the readings.</p><p></p><p>The real way is to have a 14.4v power supply and a resistor something or other that is able to handle a certain amount of power at said ohm/impedence/resistance but GL finding or affording those.</p><p></p><p>Real bench is done with the o-scope aswell to know the threshold of clipping.</p><p></p><p>Here is some info I found on Benchtesting....</p><p></p><p></p><p>Also I found this with 2 minutes of searching the web...Dummy Load 33 ohm 500 watt power resistor.</p><p></p><p>It says you can parallel four of them to make an 8 ohm 2000 watt audio amp load (actually 8.25 ohms).</p><p></p><p>They sell for about $15 shipped each....http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&amp;item=270021303748&amp;category=4664</p></blockquote><p></p>
[QUOTE="Phreaker, post: 2153015, member: 567899"] What do you want to do,bench the amp to see what it's putting out at a given impedence at 14.4v (car on) or at 12.5v (car off acc. on)? If you want to find what the amp is pushing at say 1 ohm with a 14.4v power supply then just hook up the DMM and the Clamp meter. I saw a thread the other day that explained how to use the DMM and Clamp meter. I think you use the clamp meter on your amps power wire where it connects to the amp and it reads the Current or amperes. I believe you set the DMM to AC volts. If your subs are wired to your amp at 1 ohm cool but remember impedence rise from box so what you measure may not be a true 1 ohm impedence. Take the reading from the calmp meter and the DMM at the same time. Multiply the amperes by the volts example 40v x 100amperes = 4000w Do the same thing to find the amps output with 12.5 volts power supply by turning the car off and only having the ACC. on. Remember also to have your HU's volume up to it's max unclipped volume when taking the readings. The real way is to have a 14.4v power supply and a resistor something or other that is able to handle a certain amount of power at said ohm/impedence/resistance but GL finding or affording those. Real bench is done with the o-scope aswell to know the threshold of clipping. Here is some info I found on Benchtesting.... Also I found this with 2 minutes of searching the web...Dummy Load 33 ohm 500 watt power resistor. It says you can parallel four of them to make an 8 ohm 2000 watt audio amp load (actually 8.25 ohms). They sell for about $15 shipped each....http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270021303748&category=4664 [/QUOTE]
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