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Outputs When the Helix XLR outputs are subjected to phantom power, the output level is decreased. Do not try and connect your Helix to a mixer, interface, or PA system that supplies phantom power (48v) to the Helix XLR outputs. The workaround is to use the 1/4" outputs instead. If your setup requires XLR usage and phantom power cannot be avoided, we've seen some customers have success with a phantom power suppressor. Input When using the XLR input with a microphone, do not "hot swap" the cable. Do not have the 48v phantom power engaged when plugging in an XLR cable. It's best practice to plug in the cable with a mic attached to the other end, then go into Global Settings>Ins/Outs and turn on the Mic Phantom Power. Make sure to disengage the 48v before unplugging the cable as well.

The Helix is designed for the user to set up a number of signal flow combinations. It allows for unique situations that would normally be extremely difficult to set up in real life. They can now be easily arranged within the unit. For further reading, make you also check out the Helix manual section on Serial vs. Parallel Routing and Moving Split & Merge Blocks. View the Helix manual here Having said that, you can also get some un desirable results if you're not careful with how you set up your routing. These can include phasing issues, volume drop, or noise floor increase. *Notes about Inputs and outputs · 1/4" Returns are unbalanced. · All Helix outputs (main outs and Sends) are impedance balanced, so you can plug a TRS cable and go to another device balanced input and profit from some common-mode noise cancellation. . When the Helix outputs are set to line level, they are +4dBU nominal with approximately 15dB of headroom. When set to instrument level, they -10bBu. Or more simply, they are 20Vpp max input/output. Noise floor increase due to the introduction of Sends and Returns When using the Helix sends and returns the noise floor can be increased. This is due to the number of A/D converters now used in the signal chain. Most of the increase is negligible. However, it can become more noticeable if the sends/returns are placed in front of a high gain amp model such as the PV Panama (Peavy 5150) due to its inherent high noise floor. This phenomenon occurs on the Pod HD series as well. . Potential latency issues due to the introduction of Sends and Returns This is another one that you won't notice in most situations, but could arise given certain circumstances. The tiny amount of latency introduced from another set of A/D converters is impossible to hear on it's own. An issue could occur if you merge that pathway back with another serial pathway that wasn't going through that send/return. The millisecond delay may cause some undesirable phasing. Below I have pictured a signal path that might yield poor results. If you move the merge block before the Send/Return, then it would eliminate any potential phasing issues. Using Helix Hardware as an interface to record When using the Helix as an interface with a DAW, the signal routing can get a little confusing and it might become difficult to balance levels for monitoring. The typical set up would be guitar into Helix, then Helix to computer via USB. You would then monitor from the headphones, 1/4" or XLR outputs. Given that setup, the guitar and the DAW's playback are sharing the same monitoring. If you have the guitar going into the DAW and then back out, you will hear your guitar twice. You can mute the DAW's return of the guitar track to avoid this. Also, in this case the volume knob will control the total output making it tougher to balance the sound of the guitar and the DAW's playback. Try setting the volume knob to only control the feed you're monitoring, and it will no longer control the USB feed to your computer. You can also try making the playback volume adjustment from the DAW. Using Helix Hardware as an interface to record with Helix Native The above signal flow still applies, but a new level of complexity is added. Since the hardware is no longer processing the guitar, you can't mute your guitar tracks return feed, because you'll want to hear it. What works best is the set up the Helix with a blank preset, and then change the output block to your desired USB output. That way, the only thing you're hearing from the Helix is your DAW's return. Auto Impedance Switching With the Helix family, the default setting for the guitar input is auto impedance. The impedance will be determined by the first block in the signal chain. Even if the first block is bypassed, the impedance setting from that effect block will determine the input signal level. This automatic impedance will change the input volume and tone, this is most apparent with guitars that have passive pickups and are directly connected to the guitar in of Helix. Distortion Pedal Volume Drop Sometimes when adding a distortion/fuzz pedal, your signal volume drops. Here's a link to a great article written by our sound designer Ben Adrian that can explain in detail what's occurring. Although the article is written to describe what happens in the analogue world, it's affect can be experienced within the Helix and it's digital models. Distortion Pedal Volume Drop (and how hard diode clipping works)

There's lots input and output options with the Firehawk line. Here's a breakdown. First let's look at what's the same on both units. USB port for updating firmware and use as an I/O interface. Variax input for any Line 6 Variax guitars 1/4" Stereo headphones (This will cut the speaker off on the 1500) 1/4" Stereo out XLR Stereo out 1/4" Stereo FX Send and Return Bluetooth Wireless for use with the Firehawk Remote app and any other Bluetooth streaming device Firehawk FX unique: 9VDC input for use with the DC3g power supply 1/4" jack for use with a outboard expression pedal (compatible with Line 6 EX1 and Mission Engineering EP1-L6) Firehawk 1500 unique: IEC power cable jack FBV cable jack for use with FBV 3 or FBV MKII MIDI in and out/thru Check out the Midi implementation chart in the manual for details XLR+1/4" Stereo Combo jacks with Gain Adjustment Knob. This is to be used with any source that you want the 1500 to be a FRFR stereo monitor. Like a Pod, Helix, or even an iPhone to play music.