How do i hook up a Mmats dhc1400.5 amp?
If they're dual 2 ohm, then http://i81.photobucket.com/albums/j230/sparky3489/PARALLEL-SERIES.jpg will result in a 2 ohm load. If they're dual 4 ohm, then the above link will result in a 4 ohm load or http://i81.photobucket.com/albums/j230/sparky3489/DUAL-PARALLEL.jpg will result in a 1 ohm load from dual 4 ohm. Each sub should be half (or more) the watts RMS of the amp at the required impedance (ohms). Something to consider...this is an example... To calculate the current draw of an amplifier, multiply the number of channels by the RMS watts per channel (a 2 channel amp rated at 500 watts RMS per channel would be 1000 watts). Double it to account for amplifier inefficiency (1000 watts X 2 = 2000 watts), then divide by the average output voltage of an alternator, 13.8 volts (2000 divided by 13.8 = 145 amps). Since the average music signal requires about 1/3rd of the average power in a test tone, divide by 3 (145 amps divided by 3 = 48 amps). This is an average approximation of current draw and it can go higher. So I would gather between *48 and 72 amperes for this example. The alternator of a: compact car is about 35 amps mid-sized car is about 65-75 amps SUV is about 145 amps Calculate 40% of the amperes of the alternator you have now. This is the average current the car uses when running. Add this number to the approximate average current draw (*48) of the amps you calculate, and you will come up with the mimimum average current required to power the audio system and vehicle. If the number you come up with is the same as what your alternator supplies, you need to take no action. For more info on enclosures and other tips, see my site http://spkrbox1.spaces.live.com
Wiring two 8 ohm outdoor speakers?
Do you know what you get when you wire a 240 Watt amp to a 200 Watt speaker and turn it up? A blown speaker! That's right, a blown speaker. Keep the volume below 6 out of 10 and the speaker will be fine hooked up one per channel or paralleling them with other speakers. Don't connect them in series with each other or other speakers you may have or you may create a matching problem for the amp's finals. I hope this will help you get sound instead of static;-) Good luck!
If I have two 400 watt RMS subwoofers what size amp do I need? How can you tell?
Probably 800 watts at half the rated ohms of one speaker. Your amp must be able to push 800 watts at, say, 2 ohms if these are 4 ohm speakers or 800 watts at 4 ohms if these are 8 ohm speakers.It will say on the speakers what the impedance in ohms is.Get an amp that is specified with 800 watts or over, at an ohm rating that is SAME or UNDER…half the ohm rating of one of those speakers.That's the answer here's a short ramble:Almost inevitably you will be running the two speakers in parallel. Whether you have two outputs on your power amplifier; or if you go into one speaker then go out from that speaker to the next; the connection you don't see inside the speaker with in and out or inside the amp is a parallel connection. Parallel connections divide the impedance (ohms.) It takes a bigger amp to handle lower impedance, because lower impedance is lower AC resistance. Lower resistance means more amps flowing for the same output voltage. More amps requires a beefier output section. The actual equation for total speaker ohms of speakers wired in parallel is:Total ohms = 1/((1/ohms#1)+(1/ohms#2))…If you put in a third speaker there would be another similar term in the denominator, (1/ohms of speaker #3). More speakers, lower ohms…The amp will say what the watts and ohms are on the back, or at least in the manual it will tell you what it can handle. Be at or below the ohms, and above the watts.
Door speakers dont work but subwoofers do?
Give a little more detail about your system. Are your door speakers amplified by the radio or an external amplifier? Are the twelves powered by an external amplifier? What radio and amplifiers are you using? Give us the entire layout. There are far to many possibilities to give an accurate answer based on what you have given. edit: Sounds like you could be right about the factory amp. I have no idea what the input voltage range is for the amp's inputs; maybe a local shop could help you with that one. Now how about a model number for that amp and JVC radio? Also, tell us how the subs are wired to that amp?