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  • JBL PRX618S-XLF

    I've played one gig with my new PRX-XLF sub. It was a decent-sized room for a class reunion. It had plenty of thump even though we didn't get a proper sound check, like I would have preferred.

    Tomorrow, we are playing in a much-smaller bar. So, I'm planning on only using the XLF and not my other HPR151i sub.

    I was wondering, however, how the XLF sub works when there is only one channel being used. The manual states that it sums a stereo signal into a mono signal.

    However, if I plug into the left channel only, am I getting only half of the power? The manual doesn't mention this.

    Even if I'm running a mono output from my mixer into the sub, should I use an XLR splitter to send the signal into both channels of the sub?

    Thanks
    mike

  • #2
    You are only getting half the signal, but you are most likely not running anything through the sub that requires a stereo signal anyway. Just plug the XLR into the left input.

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    • #3
      Does that also mean I'm getting half the power, too?

      Comment


      • #4
        Even if I'm running a mono output from my mixer into the sub, should I use an XLR splitter to send the signal into both channels of the sub?


        No. If you are running stereo then you should use both inputs to sum the stereo channels into the sub. If you are running mono, it doesn't matter. Either way you can still get full power out of your subs.

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        • #5
          I run with 2 XLFs. Each one only gets 1 input. I still get full volume, or output SPL if you will, out of each box (if I am understading your question correctly).
          <div class="signaturecontainer">Good judgment comes from experience, and a lot of that comes from bad judgment. -Will Rogers<br><br><a href="http://facebook.com/SpitShineRocks" target="_blank">http://facebook.com/SpitShineRocks</a></div>

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          • #6
            One side of the amp will not mean half the power (non-bridged mode). Amps are rated per channel so, for example, 800 watts per channel will be delivered to each output. If you are asking if 800 watts per channel is the same as 1600 watts...and using only one side means 800 watts or half the power, it really isn't that simple. Just use one side and you will be fine.
            <div class="signaturecontainer"><b><font size="2">&quot;The music business is a cruel and shallow money trench, a long plastic hallway where thieves and pimps run free, and good men die like dogs. There's also a negative side.&quot;</font></b> - <i>Hunter S. Thompson</i><br />
            <br />
            Band promo shots on railroad tracks were cool in 1981...<img src="http://img3.harmony-central.com/acapella/ubb/facepalm.gif" border="0" alt="" title="facepalm" class="inlineimg" /></div>

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            • #7
              Thanks, everyone. That's what I was hoping to hear.

              I bought an XLR splitter, so I plan on running from the mixer to the sub. From that, the output of the sub to the XLR splitter, and then into each top.

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              • #8
                Dasiy chain the tops. Mixer, to sub xlr input, sub xlr output with xover engaged, to one high box XLR input, xlr output to other high box xlr input.

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                • #9
                  I will if I have a long enough XLR cable to connect the tops. I'm running low on long XLR cables for this weekend.

                  mike

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                  • #10
                    Your splitter idea should work too. But I'm going to join this discussion from a slightly different angle.

                    If you liked your sound last week, I'd set up the same way tomorrow. It's only one extra cab.

                    You just never know. I don't know how many times I wish I had brought that other sub when I've cut down to just one.

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                    • #11
                      Just to throw this out there, the first gig we used the XLF, we were thinking it wasn't a whole lot of bass relative to what we were expecting, but we ran in mono with daisy-chained tops. The second show we ran in full stereo, plugged into both sides of the XLF, and the difference was noticeable. There were a lot of factors that changed -- it was a completely different venue for example -- but we swear there's a difference between plugging into the left-only and chaining the tops, and plugging in both inputs and running the rig stereo, even with everything panned center.
                      <div class="signaturecontainer"><font size="1">How about a mother****************ing crocodile pit instead of those titty ****************s !</font><br />
                      <br />
                      <br />
                      <font size="1"><i>Last edited by Jazz Ad on 06-20-2004 at 09:08 PM</i></font></div>

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                      • #12
                        Your splitter idea should work too. But I'm going to join this discussion from a slightly different angle.

                        If you liked your sound last week, I'd set up the same way tomorrow. It's only one extra cab.

                        You just never know. I don't know how many times I wish I had brought that other sub when I've cut down to just one.


                        The other sub will be in the truck. This place is kinda weird in that on one side, we have a thin wall that separates the band area from the bathrooms. The other side has a bunch of electronic dart boards and kitchen cabinets/counters. Cutting down on one sub would make it a bit less-cramped.

                        My plan is to put the sub to the left, then both tops next to each other, but angled out just a bit.

                        I'm not really sure how I'm going to do it, until I get there and have some time to think about it.

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                        • #13
                          Just to throw this out there, the first gig we used the XLF, we were thinking it wasn't a whole lot of bass relative to what we were expecting, but we ran in mono with daisy-chained tops. The second show we ran in full stereo, plugged into both sides of the XLF, and the difference was noticeable. There were a lot of factors that changed -- it was a completely different venue for example -- but we swear there's a difference between plugging into the left-only and chaining the tops, and plugging in both inputs and running the rig stereo, even with everything panned center.


                          This will be easy enough for me to test. I can quickly run a stereo signal to the sub, then switch it out for a mono signal.

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                          • #14
                            This will be easy enough for me to test. I can quickly run a stereo signal to the sub, then switch it out for a mono signal.


                            Why wouldnt you do it like this anyway?

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                            • #15
                              We run in mono. Why bother with another, long XLR cable run when there is no need?

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