.uk dhole23
Date: Sat Jul 26, 2008 5:54 am ((PDT))
"but apparently XLR to TRS cables weren't available"
Annoyingly the fr-2le line input is unbalanced and thus not trs.
dave
Dan Dugan wrote:
>
>
> lilyplants wrote:
>
> > Dan,
> > are you saying that gina had an external mic preamp between her mics
> > and both mic
> > inputs to use all the amplification from the external mic preamp or
> > add to the FR2-LE pre
> > amp?
>
> To add to it. My exclamations referred to the incorrect connection of
> the preamp's line output to the recorder's mic inputs. That connection
> almost guarantees either a noise or an overload problem. The Fostex
> has line inputs, but apparently XLR to TRS cables weren't available to
> connect up the preamp properly. But I don't think she needed a preamp
> at all.
>
> > Secondly, are you saying you used your external mic preamp for one
> > channel and the FR2-
> > LE mic pre amp for the 2nd channel?
>
> Yes.
>
> > And that the results were that you got an equal gain
> > from both mics with that configuration?
>
> Equal gain when the channel with the preamp on it had its gain trimmer
> (the tiny knobs) all the way down, and the channel with the mic
> directly into it had its gain trimmer all the way up.
>
> The important part of the experiment was listening to see whether
> there was significantly more noise on one side or the other. Didn't
> seem like it, but as I said we didn't really finish the job by
> listening in a quiet place.
>
> > If that's true, I don't see why you have to turn the gain (volume?)
>
> Same thing; engineering vs consumer vocabulary. Volume controls are
> gain controls. But "gain trimmers" are usually in the feedback loop of
> the preamp and don't go silent at the minimum position. Also gain
> trimmers usually have a big jump in gain at the maximum position. So
> they are designed to be set rather than moved a lot.
>
> > all the way up to get
> > enough levels to read.
>
> What level you see on the meter will depend on the sensitivity of the
> mic, and how loud the sound is. The Fostex doesn't have a lot of extra
> gain, but it has enough for quiet soundscapes with reasonably
> sensitive mics.
>
> The FR-2LE has two gain trimmers and a master record level control.
> You could also call it a master fader.
>
> Running the trimmers all the way up isn't a problem. Inexperienced
> people hear the big jump in gain when they approach the maximum and
> think "whoa, that's too noisy." But when you turn the gain up, you
> turn the headphones down and all is well.
>
> Getting started: set the master at 2:00. Hold your left mic at arm's
> length and talk to it in a normal conversational voice while adjusting
> that channel's gain trimmer so that the meter reads about -5dB. Put
> your two mics together and adjust the other channel so the sound in
> the headphones is right in the middle of your head. Cut three little
> tape triangles to mark the positions of the knobs. Voila, you're
> balanced and calibrated to 70dBSPL =3D 0dBFS, +/- 5dB. That setting will
> work for 99% of soundscapes.
>
> > Sorry, I'm new at this (had to look up MP-2).
>
> We're here to help.
>
> -Dan Dugan
>
>
|