Understanding amps?
I cant ever seem to figure amps and wiring out. I thought i understood but may have confussed myself.
Ok If u have 2 dual 4ohm subs and your wiring up to a mono amp would wiring it to 1 ohm load be the most efficient or 4 ohms? \ Next same subs. Rated for 400 watts RMS each. Would a 500 mono amp be enough? Or would u want to run an 800 or more? 
Also what amps can be wired to .5 ohms?

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i would choose the 800 watt amp. 
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You have two subs that are 400W, 4 ohm each, each dual coils. To hook them up to a mono amp, you need to wire them in parallel. This will drop the effective impedance to 1 ohm.
Look at the specifications for the output power of your amp at 1 ohm. If the amp is rated for 800W at 1ohm, then you will be providing 400W to each sub. If the amp is rated for 500W at 1 ohm, then you will be providing 250W to each sub. 
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/ I didnt realize not all monos could handle the 1 ohm. thanks all makes since 
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So pretty much i had my last setup all wrong?
(1) Dual 2ohm wired to a mono block that didnt do 1 ohm. had one positive to the opposing negative and the other two run to the amp. thats a 4ohm load and gives less watts. had a 500 watt RMS sub on a 600 block and wasnt giving it enough watts with this setup Correct??? 
The question I have is what subs do you have? And if you already have an amp, what amp is it.
A 1 ohm load WILL produce more power, but the efficiency of the amplifier falls off dramatically, and it will also require more current. Here is an example...with a twist. The Arc Audio 500.1. The reason is you can download the tech sheet on the amplifier and it gives you the efficiency rating at the ohm load it is receiving, but this amp does the same power at 1 AND 2 ohm, and does not lose much more power at 4 ohm, yet the efficiency of the amp, and the current draw is much, much better. Power output @ 4 ohms 450 watts RMS @ 44 Amps 75% eff. Power output @ 2 ohms 600 watts RMS @ 65 Amps 68% eff. Power output @ 1 ohm 600 watts RMS @ 78 Amps 53% eff. Now if you notice the current draw, on a stock charging system, at 1 ohm, the amp WILL NOT produce 600 watts. It would be more around 475500 (VERY rough guess, could be more) because it is doubtful your car would be running more than 60 amps to power ALL your electronic systems. The amp is also rated to do this at 14.4 volts, so that, of course, is when the vehicle is running at optimum, not at idle, when the battery is only 12.312.6 volts (more or less, on a good battery) Arc amps are a bit underrated though. When tested the output is usually 3050 watts more. So you get more for your money. Sorry I am so biased, but it is good to use them for a reference as I am very familiar with the product. lol. 
ok lets forget what i had i already sold it.
Im getting a rockford fosgate p3 shallow. It is one thats preloaded. comes in the rockford marked box. It has been prewired for 4ohms. The speaker is a dual 2 ohm. 400 watts rms. I was going to get it and get a Punch 500.1. Then rewire for 1 ohm since it only buts out like 200 watts at 4 ohms. and the sub cant be wired to 2 ohms. 
http://www.arcaudio.com/productpdf/KS_mono_manual.pdf
Read page 2 of the PDF file. It answers alot of your questions as well. :D 
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You could run 2 of them at 2 ohms, because 4 and 4 parallel equals a 2 ohm load.:eek: 
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Im sorry but the earlier response was the only thing i found on page 2 referring to what were talking. " let the professional do it" 
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Doing my best bro, bare with me. 
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I do thank you though for the help. keep it coming though i like knowledge. 
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Not sure we are looking at the same thing. http://www.rockfordfosgate.com/produ...en_US&p_status= 
You are correct sir. We never discussed what size, so I just assumed it was the 10.
Yeah, I would want AT LEAST 600700 watts rms. My apologies again. HAHA. 
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