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Dual Cabinet Phase Issues


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About 2 weeks ago, I contacted L6 about an issue in Pod Farm 2.  When using a dual channel preset with an identical amp, and selecting two different speaker cabinets, there are some phase issues with the cabinet sims.  Some combinations are almost 180 degrees out of phase in fact.  After talking to L6 about it, they thanked me for the info, but stated they wouldn't be updating Pod Farm 2 with anything to adjust this.  As a result, you must record your dual tone as two tracks and use a phase correction plugin to rotate the phase for coherency in some cases, unless the phased sound is what you're going for.


In Pod Farm 2 the Digital Delay only goes down to 20 ms, and the channel delay option in the mixer only affects the DI signal, not the signal with effects.  So it has to be compensated for externally.


An example of this is a patch with an Angel P-Ball (the amp shouldn't matter) with the 4x12 Line 6 cabinet and the 2x12 Class A-30 cabinet, both using a 57 On Axis.  Pan them hard left and right.  Record a stereo track, then look at the waveform and see that one is pretty much inverted in polarity vs the other.  Summing them to mono leaves a very thin and comb filtered sound.  A phase rotation plugin can bring back the bass properly.


I just purchased a Pod HD500X, and am curious if the same issue applies here... 


Is there a way to compensate for this in the Pod? 



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nothing official...


but as far as I know there are at least 2 ways (never tested by myself):


1) - there is a pre-amp under the EQ FX category called Vintage Pre which give the possibility to invert the signal polarity, but you must be careful to not send a too hot signal into it to not get unwanted additional distortion..




2) - an old forum member called meambobbo has devised a system to get phase corrections between cab pairs:

       meambobbo phase correction


I was aware of the polarity switch.  That'd work for the example I provided, but probably not well for other combinations.


I considered doing the work meambobbo has done.  I'm really glad you just saved me several hours of work!  lol


Sounds like we need to convince L6 to add a phase rotation knob on the mixer for each channel for a proper solution.

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..also a more capable digital delay with values even below 20 ms would suffice IMO..


IdeaScale is the place to ask for new features to L6..


if none already posted there the above idea and you can vote for it, you can propose it..

but even if taken into consideration is much more likely to be implemented in Helix than into the HD (not more developed)


Didn't find one on IdeaScale so I submitted this:


Please spread the love!

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voted for your idea!!.. even if frankly I'm not holding my breath to see other ideas implemented into the HD..




BTW while we are at it, why don't give an up-vote to my "New Cab IRs model pack for the POD HD series" old idea??


one note:

pleased to have discovered just now that also the L6 product manager "Digital Igloo" up-voted it!!.. does it mean that I have to hope??..


noooo!!... it is more likely that tomorrow I look out the window and it's full summer :o :rolleyes:



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