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I have mine on an APC backup UPS. The benifits of a UPS is that they protect from surges, regulate voltage in brownout situations, and also provide filtration. You can get a small one for $100-$150. I have my Helix, 2 JBL EON 610s, laptop, wireless, and any other goodies on my rig all connected to the UPS. A 1500vA model should be plenty to run a basic Helix/FRFR rig like mine.

Sounds like maybe a hardware issue that is temporarily resolved with a reboot (when you changed rooms).

Put in a send block anywhere in your signal chain that you want sent to your amp/cab, and plug in your amp/cab to the appropriate send in the back of Helix. FOH is just your two XLR outs. Done.

You may not have as many questions as you may think if you have experience with tube amps and "analog" effects. Lots of questions come from the "bedroom" players that don't understand amps, tubes, effects, cabinets, mics, etc... I think you will be pleasantly surprised. You've already got a great monitor, so you are in good shape. Enjoy!

All effects color or shape (attenuate/boost) the sound at certain frequencies, that is why you are getting some "zing" with the trem. Another thing to keep in mind if you find yourself getting buried in the mix: don't run stereo, run mono. If you are adding a stereo trem at the end of your chain, the "zing" you are hearing may sound great by yourself, but will get you further buried in your band setting. Running a mono signal chain out to your PA will help you punch through. Stereo is great if you can get your entire audience to sit in a particular spot in front of your PA, but most of them are not sitting in the sweet spot, and are missing a lot of your sound.

Google Translate to English... Good morning, I have a problem between the pedal of the Line 6 Helix and my Marshall Jcm 2000 head, the problem is that by connecting the channel changer cable from the pedal to the head, it makes me change the channel but it triggers a crazy background sound, the same noise even if I connect the pedal cable off. I have already checked the foot pedal and it is working, the headset using its or any other single pedal switch works properly without noise. I tried with mono stereo cables and other but there is no noise going on. I would like to ask if there is someone else who has a Helix pedal and headed Marshall Jcm 2000 finds the same problem. Thank you Enzo

Yes, sounds like a subtle optical tremolo at the end of the chain. I prefer my trems in between the amp and cab models though. Definitely not a "rock my guitar tone world" kind of game changer for me. If the OP has an issue with his speaker, it won't matter what effects he is using and at what point in the signal chain.

Good grief...

It is simple to use if you have a solid knowledge base of amps, cabinets, effects, mics, etc... and you are reasonably tech savvy. You can also make it very complicated. 1/2 step down, not reliably. I would recommend trying to change your setup (string height, truss rod adjustment, etc... $), different string gauges ($$), or a bass/neck with a slightly different scale length ($$$$).

Is your speaker set for "line" level, and is your Helix XLR outs set for "line" level? After checking those two things, turn the master volume on Helix all the way up, and turn the volume on your speaker 1/2 way up. What does it sound like after that? If you put your ear to the speaker, can you tell if you have any sound coming out of the tweeter?

they all create fantastic tones, but the Helix interface is fantastic. My 10 year old daughter can navigate it with ease. Sometimes I just play and then tell her what to change and she does it on the fly for me.

Good deal. Keep it simple at first concentrating on just tone (amp/cab) at first. The tones are there, sometimes it takes a little tweaking.

Yes, what did you try? Cable, a different guitar..

^SO MUCH THIS^ "Sizzle" also comes from overdrive/distortion pedals. Those circuits are designed to clip (or distort, that's why it is called distortion) the signal. That sizzle becomes a lot more apparent on Helix because of the full range nature of the system (stock cabs have no low/high cut by default). It is even more apparent when you are just playing at home and not in the mix with a band. To get rid of harshness of the sizzle, you must do what Glenn mentioned and dial in your preset to better approximate the frequency range of the cabinet model you are trying to reproduce. You can do that with the high cut at the cab model, or put in an eq after the cab to get a steeper high cut.

I've tried downloading and trying a few. Didn't really like any of them. I build all of my presets from scratch.

If you back up your system and restore the backup, there is no "dialing back in" required. That is the beauty of digital. You can put your saved presets on ANY Helix unit, and you have exactly the same tone.

Be sure to check the obvious (guitar cable, change to a different guitar), then open a support ticket with Line 6 and they will take care of you.

What are you playing your tracks from?

You might try the HD500 forum.

That is all there is.

Exactly what routing scheme are you trying to accomplish? Keep in mind, the Helix is a guitar/bass rig and is not intended to be an all encompassing mixer/router for the studio/live environment. All of those inputs and outputs are designed for instruments, effects, and connecting to mixers/amps/DAWs.

If you have it registered at Line 6, it's two years. You are good.

Yes, you can.

Make Modelers Great Again.

Bravo for the transparency sir! And bravo for going above and beyond what normal warranty work involves.