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<blockquote data-quote="quackhead" data-source="post: 7797459" data-attributes="member: 573547"><p>man, I was just giving you examples of what is out there. There was another thread here today by someone who bought a HiFonics 1200 watt BRZ and set it up to run 4ohms at 450 watts. They could not understand why it didn't sound any louder than the Rockford Fosgate 500.1Bd 500 watt amp that made 200 watts@ 4 ohms they replaced.</p><p></p><p>I am just trying to tell you that you get what you pay for and it could cost you alot more in the long run. If you are on a tight budget and are serious about a true 1200 watts+, just to match those subs...think about this:</p><p></p><p>lets say a $300 amp rated at 1200 watts @1ohm with a 90% efficiency rating at 4 ohms, @14.4v. To get the power at 1ohm, you can realistically expect a reduction in efficiency down into the 70% margin, say 70%.</p><p></p><p>1200/.70= 1714 watts in...that is 514 watts sent to the heat sink to make the 1200 watts.</p><p></p><p>1714/14.4 = 119 amps required</p><p></p><p>Look at a amp that produces the same 1200 watts at that 90% efficiency at 4 ohms @14.4v:</p><p></p><p>1200/.90= 1333 watts in...that is 133 watts sent to the heat sink to make the 1200 watts.</p><p></p><p>1333/14.4= 93 amps required</p><p></p><p>That is a 26 amp difference in current required at 1ohm vs. 4ohms to produce the same 1200 watts. I am not saying all amps are created equal, but do remember, you get what you pay for...I almost forgot to mention adding in the expected jump from 1% thd+ @4ohms to 10% thd+ at 1ohm in some cases of cheaper designs.</p><p></p><p>Even at 93 amps system requirement, you are advised to perform the big 3 electrical wiring upgrade and possibly an upgraded battery up front.</p><p></p><p>As I said, a person looking to build a system from the ground up should</p><p></p><p>A) Determine the sound quality they wish to achieve.</p><p></p><p>B) Decide what power they want that will fit the mounting space they have and provide the most efficient and quality sound.</p><p></p><p>C) Determine electrical upgrades that will be required to continuously provide the power chosen</p><p></p><p>D) Choose subs that can handle the chosen amplifier power output and meet the space and sound quality requirements.</p></blockquote><p></p>
[QUOTE="quackhead, post: 7797459, member: 573547"] man, I was just giving you examples of what is out there. There was another thread here today by someone who bought a HiFonics 1200 watt BRZ and set it up to run 4ohms at 450 watts. They could not understand why it didn't sound any louder than the Rockford Fosgate 500.1Bd 500 watt amp that made 200 watts@ 4 ohms they replaced. I am just trying to tell you that you get what you pay for and it could cost you alot more in the long run. If you are on a tight budget and are serious about a true 1200 watts+, just to match those subs...think about this: lets say a $300 amp rated at 1200 watts @1ohm with a 90% efficiency rating at 4 ohms, @14.4v. To get the power at 1ohm, you can realistically expect a reduction in efficiency down into the 70% margin, say 70%. 1200/.70= 1714 watts in...that is 514 watts sent to the heat sink to make the 1200 watts. 1714/14.4 = 119 amps required Look at a amp that produces the same 1200 watts at that 90% efficiency at 4 ohms @14.4v: 1200/.90= 1333 watts in...that is 133 watts sent to the heat sink to make the 1200 watts. 1333/14.4= 93 amps required That is a 26 amp difference in current required at 1ohm vs. 4ohms to produce the same 1200 watts. I am not saying all amps are created equal, but do remember, you get what you pay for...I almost forgot to mention adding in the expected jump from 1% thd+ @4ohms to 10% thd+ at 1ohm in some cases of cheaper designs. Even at 93 amps system requirement, you are advised to perform the big 3 electrical wiring upgrade and possibly an upgraded battery up front. As I said, a person looking to build a system from the ground up should A) Determine the sound quality they wish to achieve. B) Decide what power they want that will fit the mounting space they have and provide the most efficient and quality sound. C) Determine electrical upgrades that will be required to continuously provide the power chosen D) Choose subs that can handle the chosen amplifier power output and meet the space and sound quality requirements. [/QUOTE]
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