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Great sound at home (UMC22 → Edifiers), dreadful/boxy through rehearsal PA – mono output issue?

robcubbonrobcubbon
in Hardware

I’m running Loopy Pro on an iPad through a Behringer UMC22.

At home the setup is:

iPad → UMC22 → Edifier powered speakers (stereo) – although doing everything mono through Loopy, no panning.

At home, it sounds absolutely fantastic, clear, full, balanced. Very bassy.

For rehearsal I’m doing:

iPad → UMC22 → Output 1 (L) mono → either:

Direct to PA line input

or

Through a DI Box into a mic input

In both cases the result is terrible: Extremely boxy and Dull

Direct Monitor is OFF.
+48V off.
Output level is healthy but not clipping.

Is there something about summing to mono from Output 1 (L) that could cause tonal collapse?

Should I be doing something specific in Loopy ?

Is the UMC22 mono output known to behave oddly?

It sounds amazing in my room. Through the rehearsal PA it collapses into something boxy and unpleasant. (I'll attach photos of the PA in the rehearsal place. Yes, it isn't great but the sound there was sooo bad I think that the next time I gig in a place with a PA, they're gonna kick me out!

I feel like I’m missing something simple.

Any advice appreciated!

Comments

  • robcubbonrobcubbon

    Sorry, the forum doesn't seem to want to upload photos today. The mixing desk in the rehearsal studios was a Phonic MU 802, if that means anything to anyone. :)

  • wimwim

    @robcubbon said:
    Sorry, the forum doesn't seem to want to upload photos today. The mixing desk in the rehearsal studios was a Phonic MU 802, if that means anything to anyone. :)

    You might need to reduce the size of some photos.

  • uncledaveuncledave

    Just guessing, but you may have a stereo effect in your processing chain. Do the Loopy Pro meters show any difference between the channels? If so, the difference in phase shift (delay) between the channels could affect this when summing the channels. It might be better to just output one channel.

  • robcubbonrobcubbon

    @uncledave I'm kinda new to stereo. (I'm used to going to gigs, plugging a mic and a guitar (with an amp sim) into a PA and going for it.)

    However, here I don't think I have any stereo effects on my iPad/Loopy Pro. I have Loopy Pro with mic and guitar playing live from the Loopy Pro inputs. The Loopy Pro sounds are either recorded at home. The Behringer interface only has one TLS input and one mic input. Also in Loopy Pro I have samples. But however I record or play the sounds, they sound great at home on my Edifier speakers and terrible in a PA.

    The Behringer interface can connect to the PA, either thru a TLS (mono) guitar cable, from the Left (1) Output to a TLS input on the mixing desk. Or I can put the Left (1) Output thru a DI Box and send that to a microphone input on the mixing desk. Both ways sounded terrible.

    I hope that answers your question.

  • robcubbonrobcubbon

    @uncledave said:
    Do the Loopy Pro meters show any difference between the channels?

    On the mixing desk in Loopy Pro, the two levels move up and down simultaneously.

  • robcubbonrobcubbon


    thanks @wim

    Here are the photos, if it helps.

  • rototomrototom

    that mixer seems to have seen better days ;)

    what if you monitor the phones output of the mixer with headphones?

    if you connect another soundsource to the mixer, does it sound good?

  • robcubbonrobcubbon

    @rototom yeah, it's a kinda old place ... sorry, I didn't bring my phones and I didn't connect anything else to the PA.

    I've jammed there before with friends and it wasn't great.

    There's a better rehearsal room I could go to but it's a bit further away from my home.

    A friend just told me I could try running 2 x TLS cables from the back of the Behringer interface into 2 inputs in the PA is a good idea.

  • uncledaveuncledave

    Hmmm. The Line input to the Phonix MU 802 can be balanced (TRS) or unbalanced (TS). The Behringer UMC22 outputs are unbalanced (TS) only. Are you definitely using a mono guitar cable (TS) when connecting to the mixer Line input?

  • robcubbonrobcubbon

    @uncledave said:
    Are you definitely using a mono guitar cable (TS) when connecting to the mixer Line input?

    Yes, it was a normal mono guitar cable.

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