feedback

[wellREDman]

was just reading the review of the v4's feedback capabilities and it made me wonder

when i was starting out i did loads of stuff with feedback, including a particularly memorable session with 2 mx50's wired in three different ways !!!

but then there was a discussion on eyecandy which seemed to suggest that feedback was damaging to mixers , and my beloved hama started acting a bit weird about then, so i stopped

but it got me wondering, now that the community is much larger and mature, does anyone have a definite answer as to whether doing feedback stuff can harm yr mixer?

[vjTranceKoder]

...from what I know, to have a feedback loop W/O ANYTHING in the loop (i.e a VCR introducing content or any other source) is dangerous. For example, if you plug the output of the V4 DIRECTLY to one of the inputs of the V4--I've been told this is when damage can occur. But say the output is going into a TV and a CAMERA pointed at the TV (output) is feed to the V4's input--it should and will be fine. I use feedback quite a bit so have been concerned about this issue in the past as well. From my experience, I've had NO problems whatsoever using the indirect methods for feedback. In fact, I can't think of a scenario right now that would make me worry.

An interesting note is that if you DO use your TV for feedback effects, you'll most likely ruin that TVs tube. I know I ruined mine:D

[robotfunk]

why should any standard in or output behave differently than that from another machine? did it many times on lappy, feedbacking in/out s-vid in flowmotion , good fun

[holly]

I did it. V4 is still working just the same as ever.

[mondo]

ditto
but nowadyas we try to avoid direct feedback output to input on the mx50 just in case

[michaelheap]

i wish some one could pin down this damage issue? i dont beleive that any damage can occur to the mixer itself, and i dont *beleive* that damage can occur to a projector (fill me in here ive never seen it happen)

i beleive this confusion occurs because of Illegal colours, this is to do with broadcast colours on NTSC, rather than damage.

[syzygy]

Another possible source of confusion is that in the audio world, feedback definitely can cause problems with certain equipment. Keep amplifying a signal in a feedback loop and you could potentially create a harmfuil signal.

Now, I wouldn't recommend attaching the output of a distribution amplifier to it's own input but in a video mixer, you shouldn't hit the ever increasing amplification issue. Video mixers all use digital processining internally, so the inputs will be put through some processing before being output and will thus be mapped to a certain range of values.

Presumably each video mixer is sending out a valid video signal from its output when it is displaying an input that is itself a valid video signal. (If not then the mixer is faulty) So where can the damage occur?

I can believe that feedback could lead to non-broadcast legal colours being produced, as most mixers won't correct non broadcast colours from a source.

Has anyone actually experienced damage from feedback?

Dan.

[SDNA]

I'm not sure but I think damage is caused where feedback creates
a sustained peak this is probably more relevant in analogue equipment i.e.. old tube cameras and TV sets this would cause burn on the tube phosphor or over heating components I would be cautious about using anything that doesn't cap the gain I think VCRs do this hence problems with macrovision

B warned I'm probably talking out my arse:nod:

[LEVLHED]

Please send me a V4 to torture :`oi!poke: :spank: :whip: :cry: :grrr: :kiss: :thumbs: :`oi!poke: with a sound PAL sync/feedback thrashing...
I'll see what its made of:)

[mondo]

:lol: :lol: :lol: :lol: :lol:
best use of new smileys award goes to lelvhed
respect:-worthy:

[videoteque]

This rumour was possibly invented by some VJ who uses feedback a lot...

This way s/he took out the competitors... ;-P:lol: