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Old 12-09-2017, 04:22 PM
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Rockford Fosgate Amp / Rokker XT Series Speakers

Hey gang. For one of my winter projects I am adding an amp to the bike.
I put J&M Rokker XT Series speakers in the fairing a few years ago (part number 40-453). I just purchased the ROCKFORD FOSGATE PBR300X4 4-CHANNEL AMPLIFIER 300W RMS and the install kit. I noticed in another forum today that this amp is spec'd for 4 ohm set up and the Rokkers are 2 Ohm. Am I screwed? Is there a way to use these together?

I also have two Boom speakers on my quick release tour pak with quick connect. If I can use the amp with the Rokkers should I set up the amp for 4 speakers or just use it as 2 channel on the fairing speakers?

Thanks in advance for your help.
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Old 12-09-2017, 04:52 PM
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Rockford Fosgate Amp / Rokker XT Series Speakers

Running 2 ohm speakers with a 4 ohm amp runs the risk of damaging the amp. Technically you could run front and back in series turning them into 4 ohm but that would be a pain and the rokkers prolly wouldn’t sound very good. J&M build their stuff so it doesn’t play well with others.
If you want to keep those particular speakers you’re better off with a J&M amp. Or there are tons of good and not too expensive speaker options that pair well with the RF amp.

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Old 12-09-2017, 05:09 PM
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Just noticed you said the rear are boom and not another set of rokkers. Pretty sure they are 4 ohm so previous option won’t work. I’d buy 4 matched speakers to go with the new amp.


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Old 12-09-2017, 08:29 PM
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You can fool around with adding inline resistors but Toe has the best idea.

Find a set of speakers that are matched to the amp. You'll be better off in the long run.
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Old 12-10-2017, 12:38 AM
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The suggestion to have all the components match is a good one. I have a J&M set up for my Street Glide that I'm getting ready to pull out. So far I've blown up two sets of J&M Speakers. One set of 7 1/4 and a set of 7 1/4 Rokkers. I'm using the J&M amp as set from them and everything is matched in terms of impedance. I don't listen to the thing at overly high volume yet their stuff isn't holding up well. My winter project is to pull the amp and Rokkers and send them back to J&M for warranty and install a set of Boom Audio speakers and no amp. Tired of blowing speakers.
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Old 12-10-2017, 12:12 PM
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Thanks BT, Inspector and Dinero!

I guess I'll pull the Rokkers and put in some 4 ohm speakers. Can you guys recommend speaker? I only see Kickers and Polk. Are there HD Booms! in 4 ohm for the fairing? Are they any good?

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Old 12-10-2017, 01:48 PM
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Originally Posted by IRONMAN View Post
Thanks BT, Inspector and Dinero!



I guess I'll pull the Rokkers and put in some 4 ohm speakers. Can you guys recommend speaker? I only see Kickers and Polk. Are there HD Booms! in 4 ohm for the fairing? Are they any good?





I prefer the Polks but speakers are pretty subjective. Not a fan of the boom at all. Biketronics is always a good source as well. Give them a call and see what they recommend.


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Old 12-10-2017, 06:36 PM
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Biketronics amp and biketronics titan II speakers here. Hard to beat their quality and customer service.

Lifetime warranty too.
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Old 12-12-2017, 03:11 PM
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Okay. I ordered two Polk 4 ohm speakers and will install them and the amp this weekend.

One other question: I have the two speakers on the tour pak that is a quik disconnect tour pak with a quick disconnect speaker wire connector coming from the head unit going to the tour pak speakers.
Is it okay to set the RF amplifier up as 4 channel even though the tour pak speakers will sometimes not be connected?
Should I just set the amp (Rockford Fosgate PBR300x4) switch to 2 instead of 4 and just run the fairing speakers off the amp?

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Old 12-12-2017, 03:44 PM
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Either way will work but it seems to me that you may give up a little sound quality set up as 2 speaker only when the tour pack is connected and set up as a 4 speaker when it is disconnected.

At my age, either probably pays a whole lot better than I can hear so it may not matter. I think you are just going to have to try the various combinations to see if they matter to you.
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Old 12-26-2017, 08:52 PM
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Well, I installed the Punch 4 channel amp and put Polk DB651 (6.5") on the front and DB522 (5.25") on the tour pak. I set the amp per instructions. The rear speakers sound amazing with a lot of volume and great sound. The fairing speaker volume is kind of weak and the sound quality, not so great.
I would think the DB651's would better. Any ideas on what might be causing this/how to get the fairing speakers to sound as good as the rear in volume and sound quality?

Oh, Happy New Year fellow Doofs!!!!!

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Old 12-27-2017, 06:58 PM
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Is there a fader control not adjusted correctly?
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Old 12-27-2017, 07:27 PM
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I adjusted the fader to all front, all back, then middle. The rear speakers are definitely way louder.
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