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Sub Ohm setting

Discussion in 'Audio & Video' started by PWMDMD, Apr 4, 2020.

  1. Apr 4, 2020 at 1:20 PM
    #1
    PWMDMD

    PWMDMD [OP] New Member

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    Last edited: Apr 4, 2020
  2. Apr 5, 2020 at 11:47 AM
    #2
    DCB500

    DCB500 New Member

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    Just make sure to match it to the amp setting, that’s all you would need for it to work but I would go with the lower resistance/impedance
     
  3. Apr 5, 2020 at 11:49 AM
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    PWMDMD

    PWMDMD [OP] New Member

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    That's why I think 4-ohms is better. The amp puts out 200W RMS at 4-ohms and 350W at 2-ohms. The maximum RMS rating for the speaker is 200 watts. Just wanted to be sure my rationale was solid?

    My guess is James had me select 2-ohms with the stock JBL system because it was so underpowered. After the install I just didn't think about this until yesterday....
     
  4. Apr 5, 2020 at 12:02 PM
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    DCB500

    DCB500 New Member

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    Well yes, after looking at the SUB specs, given that the sub is max 200 rms then you would probably need to do 4ohm to avoid pushing too much power to that sub.
     
  5. Apr 5, 2020 at 12:43 PM
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    PWMDMD

    PWMDMD [OP] New Member

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    Yeah that did the trick...actually sounds better at higher volumes since I'm not over powering it now...lol
     
  6. Apr 5, 2020 at 12:54 PM
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    DCB500

    DCB500 New Member

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    Nice!
     
  7. Apr 5, 2020 at 6:27 PM
    #7
    PWMDMD

    PWMDMD [OP] New Member

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    Now I'm really confused! James just got back to me and said it should still be set for 2-ohms??? It's not that I doubt him, I just want to understand. The amp puts out 350W RMS @ 2-ohms and 200W RMS @ 4-ohms and the MAXIMUM RMS for the speaker is 200W??? I also think it sounds better as the bass is crisper at higher volumes at 4-ohms. Doesn't the 4-ohm setting seem to be a natural choice?

    Just trying to understand his rationale...I don't know if there's some weird rule-of-thumb for ported vs sealed subs enclosures that explains it or something like that...I just don't want to fry my sub.
     
  8. Apr 5, 2020 at 7:22 PM
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    Stainlesst

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    he stating you will have more head room and less strain on the amp basically you just turn the gain down to match the output for the sub. sealed boxes are going to take more power to match the output, ported are going to need less power because the sub doesn't have as much "box rise" resistance. that sub is 200 watts rms not max, 800 watts is the max. you would be just pushing the rms rating for that sub at 4 ohms but if that is the way you like the sound then more power to ya it is all about what fits you best.
     
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  9. Apr 5, 2020 at 7:27 PM
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    PWMDMD

    PWMDMD [OP] New Member

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    I guess what I'm asking is am I going to damage the sub running 350W RMS to it? The amp gains were set with a DD1 without any speaker load so the gain for the sub is just a little below where distortion was detected. I have no way of setting the gain based on the resistance of the sub speaker....at least no way I know of at this moment.
     
  10. Apr 5, 2020 at 7:33 PM
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    DCB500

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    There is less resistance at 2 OHMs which is why I said that earlier to set it that way if you had the choice. If you set the gains for the sub then you should be fine and with less resistance it’s probably better for your amp.
     
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  11. Apr 5, 2020 at 7:33 PM
    #11
    Stainlesst

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    yeah if it is set properly with the dd1 you should be set for the proper gain at the amount of power you are giving it from the amp. this is why you are getting better handling at higher volumes because you are not sending clipped signal to the sub. i say go with it. are you running any dsps or crossovers? i dont think you will blow that sub on 350 watts rms.
     
  12. Apr 5, 2020 at 7:38 PM
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    PWMDMD

    PWMDMD [OP] New Member

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    System has the stock JBL HU--->DSR1--->Kappa 5

    Thank you! Makes sense...
     
  13. Apr 5, 2020 at 7:40 PM
    #13
    Stainlesst

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    ok cool you dont want one over powering the other. (mids and highs to strong or weak)
     
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  14. Apr 5, 2020 at 7:41 PM
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    Pudge

    Pudge Super Secret Elite Member #7

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    When I had my JBL sub running on the stock amp James said leave it set to 2 ohm. When I got my JL amp he couldn't stress it enough that I HAD TO SWITCH IT TO 4 OHMS. Maybe he was just confused about you having a new amp? Set it to 4. Not only will the 2 ohm setting risk blowing your speaker, it's also bad for the amp. Just do 4.
     
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  15. Apr 5, 2020 at 7:47 PM
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    PWMDMD

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    This was my email: "Originally, I had the JBL Club WS1000 set to a resistance of 2-ohms when I first installed it into the stock JBL system. Now that it’s running off the Infinity Kappa 5, do I need to change it to 4-ohms to get the RMS to match the amp? "

    This was Jame's response: "No sir 2 ohms off thekappa"

    Hence my confusion.....
     
  16. Apr 5, 2020 at 7:59 PM
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    Pudge

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    Must be something about that specific amp. He was adamant about 4 ohms for my JL amp
     
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  17. Apr 5, 2020 at 8:03 PM
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    Stainlesst

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    the JL amps are power restricted they put out the same power at both ohm loads but when it is an option the 4 ohms will have less a strain on the amp and they are underrated at most.
     
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  18. Apr 5, 2020 at 8:03 PM
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    PWMDMD

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    Well between the matched specs, ported box requiring less power, better sounds and the fact that I can't set the gain using 2 or 4 ohm resistances...I'm going to keep it 4 ohms unless someone here provides a logical reason why I shouldn't. Thank you everyone!
     
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  19. Apr 5, 2020 at 8:29 PM
    #19
    Stainlesst

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    that sounds good i highly doubt you will be putting any strain on that amp or sub on that setting just dont turn bass boost on lol...
     
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  20. Apr 6, 2020 at 5:03 AM
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    Twinky

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    Either setting will be safe. You could have a 1000 watt amp as long as you set your gains accordingly.

    You're going to increase the gain until you hear the sub start to distort, and then back it back down just a bit. Only difference will be that you will have to increase the gain a tad bit more on 4 ohm mode than you would if it was set on 2 ohm mode.

    I'd set it for 2 ohm for a couple reasons.
    1, less gain will be needed.

    2, your sub can safely handle burst of power that are more than its rated for. Music is dynamic so it actually rare for an amp to send the full amount that your gain levels are set at. Then there's box and impedence rise to account for ect...

    3, you also will be getting more power on your other 4 channels if I read the specs correctly. They are kinda confusing on how they list it.
     
    Last edited: Apr 6, 2020
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