Can I Run 3 Sets Of Speakers On A 4 ch. Amp?
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From: Central Jersey
Do you know of a good 2ohm 6.5 inch speaker?
Last edited by 1sweetglide08; Feb 19, 2012 at 07:08 PM.
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From: Central Jersey
Not sure if the ARC KS 125.4 will fit under the fairing on top of the radio very well. Please comment if anyone has tried using this amp under the fairing.
6th Gear
Joined: Dec 2007
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From: Texas
Soooo... Has anyone an opinion on a PBR 300x4 running Infinity 612 Marine speakers in Front And two sets of Infinity 6912 6x9's in each custom lid on a 14 SGS? Not looking for competition, just something that looks different and sounds nice.
Last edited by sapperKT; Mar 24, 2015 at 09:19 PM. Reason: Adds
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From: Ga.
No, definitely not happening, the 4 channel amp is not capable of powering that set up, and is only stable at 4 ohms.
Tourer
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From: U S of A
Yes you can. It's exactly what I would do in your situation. You will not loose any volume. If anything the amp might run a bit hotter. Whoopity doo. 
On the output side of your amp just wire the right side fairing and lower speaker together then the left side fairing and lower speakers together... then use your other channel to run the lids. Now if you were trying to do this with subs you would have a different issue. I'm dialing in my PBR 300x4 right now. This amp has a **** ton of power. I'm just under 5 on the gain.
On the output side of your amp just wire the right side fairing and lower speaker together then the left side fairing and lower speakers together... then use your other channel to run the lids. Now if you were trying to do this with subs you would have a different issue. I'm dialing in my PBR 300x4 right now. This amp has a **** ton of power. I'm just under 5 on the gain. HD Forum Stories
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Road Warrior
Joined: Oct 2008
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From: Rosamond, Cali
If the amp is rated for 4 ohms impedance per channel, there are 4 channels, and you have 3 pairs of speakers, then…
Two channels will be wired with 4 ohm speakers.
For each of the other two channels, you can either wire two, 2-ohm speakers in series, or you can wire two, 8-ohm speakers in parallel. Either combo will provide 4 ohms impedance, matching the amp. (You can run an amp channel with a speaker-load rated at greater than rated speaker impedance, with a reduction in volume versus running it at rated impedance; but I wouldn't personally run an amp channel with a speaker-load at less than rated impedance due to concerns for heat and/or longevity. The optimal situation, impedance-wise, is to match the speaker equivalent impedance to that of the amp).
Keep in mind you are splitting the power on the two-speaker channels such that half the channel power goes to each speaker. This is in contrast to the channels that have one speaker which has the full power of the channel. How this plays out in terms of volume from each speaker might or might not be satisfying to you. You'll have to see.
Two channels will be wired with 4 ohm speakers.
For each of the other two channels, you can either wire two, 2-ohm speakers in series, or you can wire two, 8-ohm speakers in parallel. Either combo will provide 4 ohms impedance, matching the amp. (You can run an amp channel with a speaker-load rated at greater than rated speaker impedance, with a reduction in volume versus running it at rated impedance; but I wouldn't personally run an amp channel with a speaker-load at less than rated impedance due to concerns for heat and/or longevity. The optimal situation, impedance-wise, is to match the speaker equivalent impedance to that of the amp).
Keep in mind you are splitting the power on the two-speaker channels such that half the channel power goes to each speaker. This is in contrast to the channels that have one speaker which has the full power of the channel. How this plays out in terms of volume from each speaker might or might not be satisfying to you. You'll have to see.
Last edited by AlanStansbery; Mar 25, 2015 at 05:03 AM.
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From: Ga.
The 300x4 is only rated at 4ohm per channel. It is not safe to run the amp in this configuration. If you want to run a 6 speaker setup with the 300x4, you should wire the 4ohm 6x9 to the rear channels, then purchase a couple sets of 2ohm speakers and wire them in series to the front channels.
No matter what was posted in the quote you added, that amp does not have a ton of power. It barely makes its rating, I have installed a few of them and benched 4 of the installs, and while they are fine amps, the 4 channel is not suited for what he wants to accomplish, unlike its brother the RF 2 channel amp (which almost always surpasses its rating). He should choose a different amp, or use the 300x4 for two sets of speakers and get a 300x2 for the others.
If the amp is rated for 4 ohms impedance per channel, there are 4 channels, and you have 3 pairs of speakers, then
Two channels will be wired with 4 ohm speakers.
For each of the other two channels, you can either wire two, 2-ohm speakers in series, or you can wire two, 8-ohm speakers in parallel. Either combo will provide 4 ohms impedance, matching the amp. (You can run an amp channel with a speaker-load rated at greater than rated speaker impedance, with a reduction in volume versus running it at rated impedance; but I wouldn't personally run an amp channel with a speaker-load at less than rated impedance due to concerns for heat and/or longevity. The optimal situation, impedance-wise, is to match the speaker equivalent impedance to that of the amp).
Keep in mind you are splitting the power on the two-speaker channels such that half the channel power goes to each speaker. This is in contrast to the channels that have one speaker which has the full power of the channel. How this plays out in terms of volume from each speaker might or might not be satisfying to you. You'll have to see.
Two channels will be wired with 4 ohm speakers.
For each of the other two channels, you can either wire two, 2-ohm speakers in series, or you can wire two, 8-ohm speakers in parallel. Either combo will provide 4 ohms impedance, matching the amp. (You can run an amp channel with a speaker-load rated at greater than rated speaker impedance, with a reduction in volume versus running it at rated impedance; but I wouldn't personally run an amp channel with a speaker-load at less than rated impedance due to concerns for heat and/or longevity. The optimal situation, impedance-wise, is to match the speaker equivalent impedance to that of the amp).
Keep in mind you are splitting the power on the two-speaker channels such that half the channel power goes to each speaker. This is in contrast to the channels that have one speaker which has the full power of the channel. How this plays out in terms of volume from each speaker might or might not be satisfying to you. You'll have to see.
Did you see that he wanted to run two sets of 6x9 infinity speakers and a set of 6.5" 612's? So no matter how you wire it, the amp does not have the power to sufficiently supply that set up, I mean if we're just saying yes it can be done, because it can, then, he might as well run 8 sets of speakers off of that amp, because that can be done also. I don't understand giving someone that needs advice and information, an answer that might lead him to try something that just won't be satisfying to anyone, most likely. I mean, "volume from each speaker might or might not be satisfying to you. You'll have to see.", I can't see anyway, that the components he wanted to use could be made to work in a "satisfying" manner to anyone. The choices would be, a) two sets of 6x9's - well underpowered now, and drowned by the fairing speakers that have been almost perfectly matched to their power source, or b) the 6.5's and one set of 6x9's - so now you have a set of 6x9's in a lid that half the time you can't even tell if they are working, because they are being powered by half of the power that the 6x9 beside it is using, and the speakers in front of you are now, just getting by.
So, I still say my original answer is the correct one, no, definitely not, not that set up anyways.