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About feffa86

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    Tromsø, Norway

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  1. feffa86

    Hosa CDL-313 S/PDIF-AES Interface

    https://www.rane.com/note149.html It's not that I didn't think it wouldn't work, or couldn't have tried. IF (BIG if) you know that either the transmitter or the receiver is transformer coupled and the interconnect distance is short then a simple resistor divider will match the impedances and change the level as shown in Fig. 1. This is the AES3id recommended network for creating a 12-dB pad (4:1 voltage divider) and converting the AES3 110 ohm balanced output impedance into 75 ohms for driving the AES3id input. Therefore an average output level of 4 volts will be reduced to 1 volt. Since this exceeds the max allowed for S/PDIF, use the values shown in parenthesis to create an 18-dB pad (8:1 voltage divider) producing 0.5 volt output for the same 4 volts input. (Other average AES3 output voltages require different resistors -- consult AES3id for value graph). Transformers make the best passive impedance matchers, plus provide the benefits of ground isolation, high-frequency rejection, DC blocking and short-circuit protection. Impedance matching is easily handled by selection of the appropriate turns ratio (1.21:1 for 110-ohm to 75-ohm -- it's the square of the turns ratio for impedance) and careful attention to winding details allow wideband high-frequency transformers (you need ~12.5 MHz). The best and safest converter includes the transformer. If you are not sure about the transformer isolation of the equipment interfacing, use a store-bought impedance matching transformer that comes complete with connectors and a separate resistor voltage divider network as shown in Fig. 2. This T-network is a 75-ohm:75-ohm bi-directional attenuator. The attenuation is a little less than that of Fig. 1 for the same (assumed) 4-volt AES3 input because the transformer reduces the voltage level by a factor of 1.21:1 (down to 3.3 volts) as well as matching the impedances. If you're still reading, the point is, the box takes care of a number of signal integrity issues that I would have to learn and understand a bunch of stuff i'll never use for anything but this single conversion in my rig to overcome. It cost the same as about two mogami cables, I have about 10 of those in my rig. I didn't want "works", I wanted "optimal solution". :P It has active electronics, so it kinda works like a line isolator with respects to ground. I haven't yet done any latency tests but S/PDIF and AES have the same kind of data code for the sound. The difference is header data. So there's nothing being converted. Maybe header data is being stripped. It makes no sense that there's any latency induced by the design. I can't tell a difference before or after, but presumably there's a couple ms less lag in my signal. There, at the very least, is no more lag than there used to be. It is a known fact that AD/DA causes a bit of hissing noise. So there's a tiny amount less hiss in my setup. I'm not sure I even have a noise floor any more.
  2. feffa86

    Hosa CDL-313 S/PDIF-AES Interface

    RCA S/PDIF and XLR AES cables have different resistances. I was assured by people more knowledgable than me that that was sub-optimal. So I got this box finally. The power adaptor doesn't work in the EU, but I was able to get a universal wall wart at a regular all supply store and that worked just fine. Eventually I'll get a better one, like maybe the iFi iPower. I falsely assumed the 9V DC input would accept guitar pedalboard power supply cables, but it didn't. It's a smaller type of plug. So it works just as advertised. Kemper S/PDIF out goes into the box and an AES cable goes into the Helix AES/EBU input. The Helix picks up the signal fine and everything works as expected. One less AD/DA round in my rig now. Too bad the Helix can't run both S/PDIF and AES at once or I could eliminate one more. I just realized, since I'm already using my 1/4" main Left output to feed the Kemper, I now have two extra FX loops available in the Helix with this box. That's another reason to shell out the 100 I didn't even consider.
  3. feffa86

    New Speaker Models?

    Co-sign, hoping there's something in the pipeline for the Powercab+. I'm using two Powercabs in stereo through L6 link and when I connect either one of them to the computer through USB I can only record the channel going to that speaker and not both channels. I think someone affiliated with Line 6 said that's a bug, so hoping that'll get fixed too.
  4. feffa86

    Hosa CDL-313 S/PDIF-AES Interface

    I have the Helix rack version. I just checked, you're right, it's not an L6 link input, it's an AES/EBU input. I can't use the Helix S/PDIF input because in the global settings, you have to set "Digital" to either "AES / EBU" or "S/PDIF" and one disables the other. I have two Powecab Plus' that I run from the L6 link output (which even gets expanded upon in the next firmware patch) so that's why I have to use the AES / EBU input. I've done some reading, and AES / EBU and S/PDIF may be cross-compatible or it may not. Some times it is, some times it isn't. There's the sound data and some header data, and depending on the header data, the receiving unit may or may not be able to interpret the signal. Also, the resistance is different in S/PDIF and AES / EBU cables which seems to make a difference if I am to trust people more experienced with these kinds of crossovers than me. I think a custom made AES / SPDIF cable is an untidy solution, and like I said, research seems to suggest it could end up not even working. I'm not sure there actually is a digital-digital conversion with this box, I think the box just does something to the header data. I don't really exactly know what it does, but I know it's meant for interfacing exactly like the way I'm trying to do. Different units with different I/Os. I may be a little off, maybe you don't call it header data, I didn't graduate in this, but that's the jist of what I found out. I can interface ANY unit with only S/PDIF outs to my Helix. Or my Helix to ANY unit that only has S/PDIF inputs, while using my Powercabs. That's the worth of the box. If it ends up causing a mere 1ms lower total latency in my rig that'll be an added bonus, and I know it'll have an effect on the tiny amount of hiss I do get with the Kemper noise reduction set to off. I am already using standard 1/4". That's what I want to not do, if possible.
  5. feffa86

    Hosa CDL-313 S/PDIF-AES Interface

    I'm looking at this: https://hosatech.com/products/digital-audio/s-pdif-interfaces/cdl-313/ I'm wondering if anyone's tried to use this with the L6 link input on the Helix. Does it work? I want to feed my Helix an S/PDIF signal from a Kemper. I've read about S/PDIF to AES/EBU and understand that some times it works and some times it doesn't, and it's kinda down to the implementation of the standards in a given device. I'm just trying to see if anyone already tried it before I go ahead and do so myself. I'm trying to bring the number of AD/DA conversions in my rig down.
  6. feffa86

    Helix and other equipment

  7. feffa86

    USB IN 1/2 Destination: Lacking AES/EBU option!!

    I have also posted a suggestion that's, imo, closely related to this one. It's already in review but I'm posting it here nonetheless: https://line6.ideascale.com/a/dtd/Add-a-Digita-output-option-in-the-global-settings/948742-23508
  8. feffa86

    Ear Pain after switching to Digital

    I'm sure the world of plugs is huge and uncharted, could you link to yours? If they work for you that's a good bet imo, I want to try it.
  9. feffa86

    Helix Bug Reports

    You can control check that by doing a spectral analysis on a computer and comparing on/off. It will visually show you the exact cut off point. Im on vacation or I'd check it for you.
  10. feffa86

    Ear Pain after switching to Digital

    You're probably running a high and low cut filter on your preset. Where is your high cut set? High frequency harshness is amplified exponentially the more volume. It has a name. The something-muncher-effect. Lol, something to that effect. Just a thought but if your answer is "12k" that can be a factor. If you've already got this stuff under control, disregard my post :)
  11. feffa86

    Helix To Powercab+ Via L6 Link

    I don't actually think you are experiencing an issue. Before I get into details, why are you changing between L6 link and XLR? Why do you need the volume of the 2 (XLR and L6 link) to be consistent? I didn't grasp that from your post. Why don't you use L6 link only, forget about the difference and live happily? I don't see where you would ever be swapping between the two. XLR is hotter than 1/4". L6 link is digital. Are you running your signal into the PC+ through L6 link with all volume knobs and sliders at 100% and experiencing that the sound out of the speaker isn't loud enough? I don't understand the issue. I run my Helix into two Powercab+. I use L6 link. If I were to send XLR to a mixing desk and use a PC as a monitor, I would control the monitor volume and the sound guy would control the XLR feed with their mixer - theirr volume wouldn't be consistent anyhow. My PC+s are LOUD. My signal path is estimately somewhat properly gain staged so my PC+ input would clip if I increased it. So yeah, describe your problem as you experience in subjective terms and it'll be easier to help. But L6 link and XLR can have varying output volumes. That's not a fault.
  12. feffa86

    Current status on L6-Link, midi and a PC+?

    Have you submitted a ticket or ideascale suggestion or anything about this? This sounds like a bug. I've never tried panning amps left right like that but I have also never experienced any bleed-through while panning stuff in general, and I always play stereo, so are you sure it's not a fault in your Helix device? Like 100%, have talked to customer service about it and they told you "nah, it's a bug on our end" kind of sure? If not, you should. I'll be doing some tests on my side as well but like I said, I some times have a friend over and we jam on each our guitar, with each our speaker, and I've never noticed anything suggesting what you described, which is why I'm asking.
  13. feffa86

    PC+ Loud Pop when switched off?

    I'm not trying to be rude, but I was feeling kinda devilish, so I was about to respond "yeah, there's a hidden setting in the options menu called "No Pops When Turning Off" but it can only be accessed by a specific button press sequence." But no, you wrote the solution in your question. :P Mine does the same, I have two.
  14. Hey. I'm running my Helix into two Powercab Plus' using L6 Link. I am trying to find a way to use one of them as my USB interface instead of the Helix, and I am facing some difficulty. I'm not sure there is a fix for this, but I'm just hoping someone has a suggestion I haven't tried. So when I connect one of the Powercabs (the left one) to the computer and choose it as the main sound device in windows, I go into Reaper and it shows up as an ASIO device in the preferences menu. I can then set up the first and last inputs and outputs, and both sound channels (left and right) show up in the list. I set it up so that the track I've created records from a stereo input, left and right. When I try to record, I am only getting a mono recording of whatever's in the left channel. Is there any way to set this up so that one of the two Powercabs can feed the whole stereo signal to my computer? I am assuming if I disconnect the second Powercab, that's what would happen, there's no way to have it work that way while both are connected?
  15. feffa86

    Current status on L6-Link, midi and a PC+?

    What exactly do you mean, and how will 2.8 fix that? If you split a path, put different amps on each path, and hardpan the outputs to left and right, you're not getting different amps in each Powercab?