Wed, Sep 04, 2019 12:19pm
therealdjabthrash wrote:WrongWayKid wrote:Greetings from Russia, comrades!...)
I have a stupid question:
Will it be safe to use Speaker Out with Fx Loop of an amplifier?
Preamp->CabM Input ->CabM Speaker Out-> Fx Loop Return
Parallel path: CabM DI Out -> Mixing Desk
It seems nobody has answered this question yet, which is far from stupid actually, and it seems that this specific configuration is not mentioned in the user manual or elsewhere.
I have the exact same question, because i want to use a CAB M the same way : in between the preamp and the poweramp (which means : in the FX loop), to be able to get :
1) my dry preamp sound to my power amp (and then to my actual cabinet)
2) my "Torpedo-ed" CAB M output (= dry preamp sound going through the CAB M poweramp + miking sim) to my mixing desk
Is it possible to use the "speaker out" of the C.A.B M as a thru jack output, even if it outputs a preamp signal that goes to the poweramp, instead of outputting a poweramp signal (speaker out) to a speaker (which is the normal case) ?
In other words :
- this "speaker out" of the C.A.B M was originally designed as a THRU in between a poweramp and an actual cab...
- ... but can it be used as a THRU in between a preamp and a poweramp (which would be way more useful in my case) ?
If so, i guess a regular instrument cable can be used (instead of a speaker cable) ?
Looking at the Block Diagram and the Technical Data of the current user manual makes me think that this is possible (and that this THRU jack output is labelled and advertised as a "speaker output" only because nobody considered using it between a preamp and a poweramp), but i need to be 100% before i buy a C.A.B. M and use it this way
Sun, Sep 29, 2019 7:27am
Mon, Sep 30, 2019 2:32am
Thu, Oct 03, 2019 10:39pm
Mon, Oct 28, 2019 8:42am
guillaume_pille wrote:Hi all,
because the SPEAKER out cannot be buffered, the ground of whatever you connect there will be connected to the ground of CAB M and your previous device (a preamp).
It may work and you will not break anything, but it's possible that you experience ground loops doing that. In that case, a DI (with isolation transformer) may be necessary.
When you connect a cabinet on that output, because the cabinet is a floating ground, you have no issue.
guillaume_pille wrote:Just to be sure i understand this right, did you mean that to make sure i have no ground loops in my case, i would need to put a DI in between the "preamp out" and the "CAB M input" ?
You won't necessarily have an issue, but in that case a DI can help. It's worth trying it anyway.Also, let's suppose i skip the "inserting a DI" (to prevent ground loops issues) part, I have a hard time seeing the difference (in terms of ground loops issues) between :
- inserting a regular fx pedal (say a delay pedal) in the fx loop of my amp (which is something lots of people do, and do not seem to have a specific ground loop issue this way)
- inserting a CAB M in the fx loop of my amp
If the CAB M is just connected in and out to your amp, no difference. But if you plug it to your amp on one side, and then into a mixer, a soundcard, another distant device with a different grounding, things can get funny.
guillaume_pille wrote:The problem is not with the DI out, it's about connecting the ground of multiple products via the CAB M, which is what you do by using the THRU not for its original purpose.
The ground lift can help, but sometimes it's not enough, it depends on how the noise travels and where it takes its source. That's the case for EVERY product. And if the noise happens because you use the THRU, well, the ground lift on the DI out is useless...
If you don't want to take the risk, do not buy it.