--- In "Avocet" <> wrote:
>
> > I'm thinking of buying a used mic from a local store and wondered if
> > there's a way of running it through some tests to make sure it's fit
> > and fully functional.
>
> Myles,
>
> In a store, fully functional, no. If it's cheap take a risk, if not
> make a take-back agreement as you can't really put a mic through its
> paces in a store. You will also need to take a listening device and
> with powered mics one with suitable power.
>
> Quick checks:
>
> Intermittent faults: Move the mic around while listening to the output
> to see if there are crackles or fizzing. Shake it gently to see if
> anything is loose inside. If it has been dropped, insist on a
> take-back agreement, but it could easily have survived OK. If it's not
> pretty, you could get a bargain price.
>
> Sensitivity: This can vary widely between types of mic, but electret
> mics can lose sensitivity with time.
>
> Directional mics should have a clear dead area, but a hypercardioid
> will have back lobes but should be low at rear side areas.
>
> Sound: Water or heat damage can distort the diaphragm or cone, which
> should be obvious. You can only check the bass and treble ends in a
> store to see if they are there. Turn the listening volume down and see
> if it takes loud noises without distortion.
>
> Noise is the most critical and impossible or check in an active store,
> but if you hear a hiss in a store, forget it.
>
> David
>
> David Brinicombe
> North Devon, UK
> Cogito cogito ergo cogito sum - Ambrose Bierce
>
Thanks very much David. Much appreciated.
Myles
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