2ohm and 4ohm? can someone explain - Road Glide Forums
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post #1 of 31 (permalink) Old 02-20-2016, 07:57 AM Thread Starter
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2ohm and 4ohm? can someone explain

I'm currently looking at doing a speaker upgrade on my 13 roadglide with the stock head unit. Looking at different brands of speakers (sooo many ) and I get confused big time on all the speaker lingo. I'm wanting a good quality speaker that will plug and play with the HK head. But, I also want a speaker that will run good off that but also will have the capabilities to to pushed by a AMP later on. The 2 and 4 ohm thing seems to be the biggest thing I run into and have no idea which I need.

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post #2 of 31 (permalink) Old 02-20-2016, 08:14 AM
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The stock speakers are 2ohm. Using 4ohm speakers, you'd see a little less output from the stock head unit...unless you were using multiple speakers on each side, wired in parallel. (four total) In that case, two four ohm drivers would result in a 2ohm load.

If you just want a two speaker set up, go with the 2ohm drivers and look for a power handling capacity that would be more than any amp you might add later on.
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post #3 of 31 (permalink) Old 02-20-2016, 08:26 AM
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I found this online article to be helpful when I was choosing my setup Series Parallel Speaker Impedance As posted earlier, HK is 2 ohm, go 2 ohm but make sure your speaker choice can handle the watts a future amp would drive.


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post #4 of 31 (permalink) Old 02-20-2016, 08:47 AM
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Ohms is resistance.... so ( without an amp ) a 4 ohm speaker will output 50% LESS than a 2 ohm speaker with your HK head unit that is rated at 2 ohms output.

That being said.. adding 4 ohm speakers to your system will cut the output in half

Next... if you just add 2 ohm speakers now....keep in mind that if you plan on adding an amp later on, ensure the amp is 2 ohm stable and not just rated at 4 ohms or you will have issues. Just throwing this out there for insight later on.
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post #5 of 31 (permalink) Old 02-20-2016, 09:05 AM Thread Starter
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Originally Posted by RGUrider View Post
I found this online article to be helpful when I was choosing my setup Series Parallel Speaker Impedance As posted earlier, HK is 2 ohm, go 2 ohm but make sure your speaker choice can handle the watts a future amp would drive.
Exactly what I needed to know. So the J&M 7.25s that's 2omh and rated to handle 140+watts would be good?
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post #6 of 31 (permalink) Old 02-20-2016, 09:26 AM
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Exactly what I needed to know. So the J&M 7.25s that's 2omh and rated to handle 140+watts would be good?
They will work and certainly sound better than stock. That being said, a set of Kappa 62.11s are also 2 ohm, but are way cheaper (can easily find them for just over $100) and will more than hold their own very well with the far more expensive JM. (If you haven't looked around much, it's a love/hate with JM)

FWIW, just adding speakers will only wet your appetite and you won't be happy for long. You can go with the Kappa's, a fosgate pbr 300x2 amp, and install kit and have way better sound than stock for about $300 total.

PS: Once you get an amp, it doesn't matter what the HU is rated at, you just need the amp to be stable at the same ohm rating as your speakers. You'll find that most of the better amps are 2/4 ohm stable, and most of your better speakers are the 4 ohm variety.

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post #7 of 31 (permalink) Old 02-20-2016, 09:45 AM Thread Starter
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They will work and certainly sound better than stock. That being said, a set of Kappa 62.11s are also 2 ohm, but are way cheaper (can easily find them for just over $100) and will more than hold their own very well with the far more expensive JM. (If you haven't looked around much, it's a love/hate with JM)

FWIW, just adding speakers will only wet your appetite and you won't be happy for long. You can go with the Kappa's, a fosgate pbr 300x2 amp, and install kit and have way better sound than stock for about $300 total.

PS: Once you get an amp, it doesn't matter what the HU is rated at, you just need the amp to be stable at the same ohm rating as your speakers. You'll find that most of the better amps are 2/4 ohm stable, and most of your better speakers are the 4 ohm variety.
Thanks man, ill check em out

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post #8 of 31 (permalink) Old 02-20-2016, 09:55 AM
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Thanks man, ill check em out
I forgot to add that you will also need adapter rings to fit the bigger speakers in the stock hole. You can still add those and be out the door for around $300 with an amp. If you care about FM reception the pbr won't interfere.

The pbr/kappas is probably the best bang for the buck setup available that keeps FM reception. The only problem with audio is the addiction. Once you get a taste it's hard not to want more.
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post #9 of 31 (permalink) Old 02-20-2016, 10:12 AM
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I believe that most marine grade speakers are 2 ohm and don't buy any speaker that is not marine grade because the speakers will get wet when washing the bike or riding in the rain.
I got off the extra money and went with J&M products which can be bought at less $ at some J&M dealers than you can get them from J&M direct even with the 10% forum discount J&M offers.
I believe that in most cases you get what you pay for and J&M is top quality and if you get the J&M 7.25 speakers then get the rokkers.
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post #10 of 31 (permalink) Old 02-20-2016, 10:39 AM Thread Starter
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Are the kapps marine grade? I'm with ironmark on wanting whatever I get to be marine grade

2013 FLTRX, stage 1 w/vance and hine power duals and rinehart slipons, TTS mastertune and some other odds and ins. Long ways to go
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