The R in that equation is the input impedance of what you are plugging the TS lead into, as I understand it. What do you think the output and input impedances are if you are running out the KPAs TS output into a mixer or amplifier?
600 -> 10k maybe? It's too low for capacitance to be of concern. A passive guitar -> amp would be around 5k -> 1M.
R = source impedance in your calculation. You have to put brackets on it, btw 
1/(2pi x Zout x Capacitance)
TS cables act as an RC filter - they low pass the signal, just like a guitar lead plugged into an amp, pedal or interface. The longer the cable and the higher the capacitance per meter the cable has, the more the treble roll off. ( roll off freqency is 1/2 pi RC where C is the cable capacitance and R is the input impedance).
Not really. With a high impedance source, like a passive pickup, cable capacitance will create a low pass filter...but that's not the case in this scenario.
The differences the OP heard is likely either lack of level matching, or the mic preamp colouring the signal.
Did you use the same outs for the FOH and the IEM mix?
I guess so, but want to make sure.
Yeah, his IEM mix was sent from an aux on the FOH console.
I'm suspecting a badly tuned PA/room or some other bad processing on your guitar's path through the console.
If you need all of those simultaneously, I'd do this:
Stereo: XLR's
Mono amp + dry guitar: S/PDIF
Leave all outputs at 0. The Apollo should manage the line output of the Kemper....Or, does the Apollo in fact accept line input on its XLR connection? If not, you'd need XLR to TRS cables, or just use T(R)S. Or use XLR and attenuate the Kemper's output 
I personally use the same rigs for all of my guitars. I tread them exactly the same way I do may amp and pedal board.
My comment was on changing between guitar and active bass
I would love to have an input-auto-adjustment.
When I switch from guitar to an active bass I often forget to change the input parameters (which aren’t intuitive for me).
Would be great not to have a need to think about that. ?
I don't get it....Do you use the same presets on both? Input can be set per preset.
I left Pro Tools some years back because of the subscription costs. And because Logic Pro offered so much more on the creation side of the process (instruments, sounds etc).
For Mac users, Logic is a no brainer
Yes this is what I mean with +10db from the preamp I get -8db with TRS cable.
Why not use XLR with line in?
Can you use the XLR inputs at line level on that interface? If not, I'd just use TS cables. Or XLR to TRS cables if your interface has balanced jack inputs.
Ok I found it. It says mic gain 0-60 and Line gain -10 - 50db. Even like that I'll have +10db gain which will make it -8db at max. Which still is strange to me. The V-twin mesa preamp would peak the line input at its maximum volume.
No...minus 10 dB to plus 50 dB for your line inputs. Meaning you'd have to dial 10 dB up from that to get to 0 dB.
Or did you mean you did exactly that and got peaks at -8 dBFS? That would mean just 8 dB of headroom in both units, which is more than high enough...
You can't drag a guitar tube preamp into the equation It's a very different thing. And it's not like higher voltage out = better quality.
Display MoreYes I use the line ins in my audio interface, with XLR I get much more volume than TRS cables.
Perfect match is to be at -18 to -12 db? My interface (audient sono) has gain controls from 0-10 in the manual it says:
The Gain controls allows to set the amount
of input gain anywhere between 0 and 60dB
which is more than enough for even the
quietest of microphones.
I have it at 0. Where did you find that the range is from -10 to +50?
And for scarlett 2i2 it's from -4 - 46db
It said -10 to +50 for line input on Audient's page. So when you have the knob at 0 you may in fact be attenuating 10 dB?
Ok guys I used an xlr cable from Main output and the volume increased like 20db. This might be the normal I guess. But why does the volume decreases dramatically when I connect the kemper through a TRS cable?
No, the XLR outputs are 6 dB hotter, and you are now likely hitting the mic preamp on your interface.
Unless you can actually chose line level for the XLR inputs on your interface, just use the TS outputs.
Both your interface and the Kemper has 0 dBFS at +16 dBu. Should be a perfect match. I see that your interface has gain control from -10 to +50 for line level. Sure you don't have it set to -10?
Have you seen the TV series LOST? Because I am now in it.
I have Kemper Main Outs using TS cables to my Interface. I have my Kemper main output volume level at -12db. If I raise it to max at 0.0db then my signal will clip inside my DAW... but then all I would have to do is lower the gain knobs on my interface to compensate to get the signal to fall back into the (-12db to -6db) recording range. Vice-versa on this if I lower main output level down to -66db (before infinity).
So what is the optimal main output db to go into DAW to get optimal tone, or is the optimal tone there no matter the signal strength?
It's just a matter of analog gain staging. Avoiding unnecessary gain/attenuation. It's not a good idea to attenuate the Kemper's output...just to bring it back up by adding gain on the next stage (interface).
If possible, leave the Kemper output at 0 dB (no attenuation) and don't add gain (noise) at the interface.
I assume that 0.0db would be the same level as 0db on your meter in DAW which would leave no headroom and begin to clip. A recording level of (-12db to -6db) is ideal in DAW, and would correspond to the Kemper Output settings (as pictured above) to be set at (-12db) not at 0.0db. Can someone confirm this to be true?
No, that's not how it works. The pad in the Kemper is intended for live use, when you more often than not go into mic preamps on the console. When recording you more often than not go into an interface set to line level, and you should not need to attenuate the output of the Kemper.
Kemper's XLR outputs have 0 dBFS at +22 dBu. The jack outputs at +16 dBu.
Let's say the interface is calibrated to +18 dBu = 0 dBFS for line inputs. -10 dBFS inside the Kemper will then end up as -6 dBFS through the interface when using XLR outputs and -12 dBFS when using XLR's.
Display MoreYes to all rigs it is the same. Output led goes slightly red only when I increase the amp volume section. Monitor out or Main out same results.
E.g.
To Valve switch is off. I just used Mic/Line2 which gives the same results. I also used my Scarlett 2i2 to compare. At Line input with preamp at 0 and kemper output at max it gives me -12db. At Instrument input it gets too loud.
-12 dBFS is a good level. No need to record hotter than that.
You can increase the rig volume level if you absolutely want a louder output going into the Sonos. The Kemper will max out at +16 dBu. I do not know what input level equals 0 dBFS on the Sonos.
I recommend leaving the RIG VOLUME at 0dB
You mean AMPLIFIER volume, no...? I'd think RIG volume is intended for balancing rigs?
Ok guys the amp volume was set to 0db. I increased it to 12 db and now I get more output volume. My max signal is -6db now. Is this the normal output volume?
Thank you for your answers guys you're really helpful
Something seems off. You shouldn't need to increase volume in the amplifier block.
How does Kemper's output led behave when you play hard? Does it go beyond green?
Does your issue with the level apply to all rigs?
Why do you use Monitor Out for recording, and is there a difference when using Main Out?
With master volume at 10 monitor volume at page 2 is 0db. [email protected]#!
Then something is attenuating the signal on its way to the output.
You should see a healthy, strong green on the Kemper's output led while playing. Do you?
What's the rig volume set to?
Is the Amplifier attenuated? (Long press on AMPLIFIER)
What happens if you bypass all 8 stomp and efx slots?
Does it distort with gain at minimum on the AC20?
With a narrow peak, the wah engaged may sound weaker but the strong peaks will still distort the amp input.
What are you recording? Processed or direct? (What source is the Monitor Out set to?)
There's nothing called "Main Monitor"....You mean "Main Out", right? As long as the output you're using is not attenuated, you're good.
Hola quisiera saber si kemper tiene algún tipo de auto wah wah?
Saludos.
Sí, el Kemper tiene muchos tipos de wah. Aquí hay una grabación de auto-wah que grabé hace muchos años. ¡Espero que el motor de traducción me haya servido bien!
¡Saludos!
Display MoreI've got the two recommended by Kemper. The DUnlop for volume and the Mission Engineering for wah.
Works great hooked up directly to the KPA. Not so with the Rocktron.
Cheers,
Mats N
And both of them has a minimum around 40-50...?
