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Discussion Starter #1
Now that I have your attention, I need a little help. 1998 27ft Ultimate Warlock v bottom. I have installed 8 Polk Audio DB650 6.5 coaxial speakers throughout the boat. I have an Alpine MRVF340 4 channel amp. I would like to not have to buy another 4 channel amp so can I hook my 8 speakers into the 4 channel amp some way without hurting either component?

I also have an Alpine amp MRD M500 mono that I am going to use to power a set of subs. Nothing fancy just some needed bass. A couple of 10's maybe 12's. What would work well for this?

Im not looking for a competition quality just some decent sound on the water.

Please feel free to fire away:)devil
 

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The HMFIC
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yes you can just split the single line from the amp close to the speakers. you will loose the ability to balance and fad properly if your into that. the proper way obviously would be to add another amp but if that is not in your budget then you will accomplish what you want by splitting each line. i would also turn down the apms output just a tad just in case the extra four speakers want to overheat the current amp and put it into temp shut down mode. on really hot days ive had my amps shut down once or twice but i installed a small fan in the area my amps are and have not had a single problem since. by the way you can get another amp for less than 180 if you shop at the right place.
 

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Discussion Starter #3
Yeah But I paid 180.00 for both of these:D and I still need to get the subs. What I am really asking is calculations. If I hook the speakers in series what will the amp see or if I hook it in parallel what does the amp see. It is 2 ohm stable and the RMS wattage looks close, I just need the formula.
 

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series

Yeah But I paid 180.00 for both of these:D and I still need to get the subs. What I am really asking is calculations. If I hook the speakers in series what will the amp see or if I hook it in parallel what does the amp see. It is 2 ohm stable and the RMS wattage looks close, I just need the formula.
IMHO
series=8ohm (perferred) run cooler less power but should be fine
parallel=2ohm amp will get hotter put out more power not worth it
 

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because ur speakers are coaxial u can make one set of wires feed two speakers.. U will also improve the sounds quality.. pos from the amp goes to one speaker.. Neg from the amp goes to the other.. Then u take a wire and connect the remaining pos and neg from the speakers together.. this puts them in series and lowers the oms.. improving sounds quality.. Now ur 8 speakers only use 4 wires which will hook right up to ur amp..
 

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Most car audio amps are rated at 4ohms for there output. If you series the speakers and go to 8ohms, you've effectively cut the output in half. IE, amp is rated at 100 watts a channel, now its 50. If you parallel the speakers the amp will see a 2ohm load. You'll have to check your amps specs to make sure the amp will run at that impedence. Most modern amps will without a problem. Depending on where you've located your speakers(are they all located in the back or are some in the cabin) you can still use your fader. 2ohm loads will generate more heat, but if ventilation is good its probably not an issue.
 
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