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<blockquote data-quote="keep_hope_alive" data-source="post: 7345069" data-attributes="member: 576029">you are correct in your math, but incorrect on some terms.some quick basics:&nbsp; ohms are a unit of measure for resistance and impedance.&nbsp; resistance is just as the name implies - the resistance to work.&nbsp; resistance is a DC term, impedance is an AC term. both resistance and impedance are measured in ohms.&nbsp; we deal with impedance in audio when talking about speakers because the signal is AC.relationship between ohms, voltage, current, and power:<img src="http://images.the12volt.com/12voltimages/ohmtable.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />amplifiers have a MINIMUM ohm requirement, not maximum.&nbsp; there is no maximum ohms requirement for subs, high impedance&nbsp;&nbsp; from I=V/R you can see as resistance decreases, current increases (if voltage remains constant).&nbsp;&nbsp; amplifiers basically do two things, they increase voltage and they source current.&nbsp; high voltage and high current = high power.so when you think about what subs to put on an amplifier, you look at it&#039;s power ratings.&nbsp; assume a monoblock sub amp is rated for 250W @ 4 ohms and 500W @ 2 ohms.&nbsp; from the manufacturer ratings you can see that this amp can power a 4 ohm load or a 2 ohm load safely.&nbsp; it can also power loads between 2 and 4 ohms, and loads greater than four ohms.&nbsp; &nbsp; another common amp is a multi-channel amplifier in which you bridge two channels into one.&nbsp; many amps have a 4 ohm minimum requirement when bridged, though some can run lower impedance loads.</blockquote>

[QUOTE="keep_hope_alive, post: 7345069, member: 576029"] you are correct in your math, but incorrect on some terms. some quick basics: ohms are a unit of measure for resistance and impedance. resistance is just as the name implies - the resistance to work. resistance is a DC term, impedance is an AC term. both resistance and impedance are measured in ohms. we deal with impedance in audio when talking about speakers because the signal is AC. relationship between ohms, voltage, current, and power: [IMG]http://images.the12volt.com/12voltimages/ohmtable.gif[/IMG] amplifiers have a MINIMUM ohm requirement, not maximum. there is no maximum ohms requirement for subs, high impedance from I=V/R you can see as resistance decreases, current increases (if voltage remains constant). amplifiers basically do two things, they increase voltage and they source current. high voltage and high current = high power. so when you think about what subs to put on an amplifier, you look at it's power ratings. assume a monoblock sub amp is rated for 250W @ 4 ohms and 500W @ 2 ohms. from the manufacturer ratings you can see that this amp can power a 4 ohm load or a 2 ohm load safely. it can also power loads between 2 and 4 ohms, and loads greater than four ohms. another common amp is a multi-channel amplifier in which you bridge two channels into one. many amps have a 4 ohm minimum requirement when bridged, though some can run lower impedance loads. [/QUOTE]

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