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post #1 of 37 (permalink) Old 11-22-2013, 07:09 PM Thread Starter
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Amp ordered

Okay I ordered the RF 300-4 are there any plug and play harnesses for that to make it an easier install? Any help Ideas where to mount this sucker would be great...Dumb question. anyone have any wiring diagrams to wire 2 jm 2ohm speakers in for a four ohm amp? I know...I know...


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post #2 of 37 (permalink) Old 11-22-2013, 08:43 PM
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I hate to be the one to break the news to you, but if you plan on running J&M speakers, unless you have 8 or running 4 in series of 2 channels, you bought the wrong amp.

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post #3 of 37 (permalink) Old 11-22-2013, 09:27 PM
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Originally Posted by dbell66253 View Post
I hate to be the one to break the news to you, but if you plan on running J&M speakers, unless you have 8 or running 4 in series of 2 channels, you bought the wrong amp.

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Nah he can run the 2 2 ohms stereo of the front or rear channels and leave the other two for expanability. Just make sure you keep the gains down or you risk blowing them.

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post #4 of 37 (permalink) Old 11-22-2013, 10:00 PM
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Nah he can run the 2 2 ohms stereo of the front or rear channels and leave the other two for expanability. Just make sure you keep the gains down or you risk blowing them.
PBR 300x4 is not two ohm stable. This won't work.


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post #5 of 37 (permalink) Old 11-22-2013, 10:55 PM Thread Starter
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If I wired the 2 front in a "series" wouldn't that make 4ohm? If it's wired in parallel that would be 1 ohm..correct?


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post #6 of 37 (permalink) Old 11-22-2013, 10:59 PM Thread Starter
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http://www.eminence.com/support/wiring-diagrams/

Wiring Configuration for 2 Speakers in Series
Wiring two speakers in series
Two 2 ohm speakers = 4 ohm load
Two 4 ohm speakers = 8 ohm load
Two 8 ohm speakers = 16 ohm load

four in a series with four 2 ohm off two channels....only issue is not sure if it will have enough power...Ya'll think i would be better off with the 300x2? May only be putting out 40w per speaker?


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post #7 of 37 (permalink) Old 11-23-2013, 02:42 AM
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If you're going to be using 4 speakers in series (2 each side), and planning to have spare outputs left, the 300◊4 will be ok, but the speakers will be well under powered. IMO I would try to more closely match the RMS of the speakers and amps. I don't know what your budget or expansion plans are, but I think there are better ways to go, as stated in all threads, there are a lot of different opinions.

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post #8 of 37 (permalink) Old 11-23-2013, 04:45 AM
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PBR 300x4 is not two ohm stable. This won't work.


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They also said they werent stable under 4 ohm mono in the past models and guess what, I have PERSONALLY ran them down to 1 ohm. The only reprocussion that came of it was that it got hotter faster.

In the OPs case it wont matter as he is only running 2 speakers and not going to crank the gains (they are never to be ran over 3/4 gain)

OP- Whether you run the 300x4 or the 300x2 you will be fine at 2 ohm stereo. The only added bonus you will have with the 4 channel is, if you decide you want lower speakers or lid speakers you will be able to add them. If your real worried about it, go with a different set of speakers that are 4 ohm.

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post #9 of 37 (permalink) Old 11-23-2013, 06:33 AM
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Originally Posted by dbell66253 View Post
If you're going to be using 4 speakers in series (2 each side), and planning to have spare outputs left, the 300◊4 will be ok, but the speakers will be well under powered. IMO I would try to more closely match the RMS of the speakers and amps. I don't know what your budget or expansion plans are, but I think there are better ways to go, as stated in all threads, there are a lot of different opinions.

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X2...matching the componets is critical. not so much the brands but the format in which they are designed to perform. For the best BANG for the $$$ match your componets. Go look at the offerings the MC stereo companies are selling, it will help you understand what formats work best together, then go find your best deal on one of these formats.
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post #10 of 37 (permalink) Old 11-23-2013, 08:52 AM
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They also said they werent stable under 4 ohm mono in the past models and guess what, I have PERSONALLY ran them down to 1 ohm. The only reprocussion that came of it was that it got hotter faster.

In the OPs case it wont matter as he is only running 2 speakers and not going to crank the gains (they are never to be ran over 3/4 gain)

OP- Whether you run the 300x4 or the 300x2 you will be fine at 2 ohm stereo. The only added bonus you will have with the 4 channel is, if you decide you want lower speakers or lid speakers you will be able to add them. If your real worried about it, go with a different set of speakers that are 4 ohm.
Well it's good that you were able to run the amp outside of the manufacturer's specifications but I wouldn't recommend it especially when you are running it at high volume for hours at a time on road trips. As DBell mentioned, in a series configuration the speakers would be well under powered.

OP, good luck with whatever you choose.


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