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Audio and Video Talk
General Discussion
Looking to expand my knowledge re. impedance and control
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<blockquote data-quote="frikkie" data-source="post: 50996" data-attributes="member: 845"><p>Running the subs in a 2ohm configuration makes the amplifier work a lot harder than it would running them in an 8ohm configuration. Into 2-ohms, the amp is forced to supply a lot more current vs the 8ohm configuration, and depending on the design of the amp, it is likely that it simply couldn't supply enough juice into 2-ohms...</p><p></p><p>Simple electronic theory (very basic but gives the idea): to supply a certain wattage into a speaker, the amp needs to supply a certain voltage at a certain current. Let's say the amp is capable of supplying 40v into the speaker. To do this, it needs to supply:</p><p></p><p>Current = Volts/ohms, ie, 40/8 giving 5 Amps. Amp is happy.</p><p></p><p>Now, you changing the resistance seen by the amp to 2 ohms. All of a sudden:</p><p></p><p>40v/2ohms = 20amps... Amp no longer so happy, as the PSU may well not be meaty enough to supply that sort of current...</p><p></p><p>Watts = volts x amps, so in instance one it supplied 40 x 5 = 200watts to the speakers.</p><p>In instance two it supplied 40 x 20 = 600w...</p><p></p><p>There's not many amps that will do this happliy.</p><p></p><p>Hence, better sound, better control when matching impedance to the what the amp handles best.</p></blockquote><p></p>
[QUOTE="frikkie, post: 50996, member: 845"] Running the subs in a 2ohm configuration makes the amplifier work a lot harder than it would running them in an 8ohm configuration. Into 2-ohms, the amp is forced to supply a lot more current vs the 8ohm configuration, and depending on the design of the amp, it is likely that it simply couldn't supply enough juice into 2-ohms... Simple electronic theory (very basic but gives the idea): to supply a certain wattage into a speaker, the amp needs to supply a certain voltage at a certain current. Let's say the amp is capable of supplying 40v into the speaker. To do this, it needs to supply: Current = Volts/ohms, ie, 40/8 giving 5 Amps. Amp is happy. Now, you changing the resistance seen by the amp to 2 ohms. All of a sudden: 40v/2ohms = 20amps... Amp no longer so happy, as the PSU may well not be meaty enough to supply that sort of current... Watts = volts x amps, so in instance one it supplied 40 x 5 = 200watts to the speakers. In instance two it supplied 40 x 20 = 600w... There's not many amps that will do this happliy. Hence, better sound, better control when matching impedance to the what the amp handles best. [/QUOTE]
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Audio and Video Talk
General Discussion
Looking to expand my knowledge re. impedance and control
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