Hi David,
It's important here to distinguish boundary from other barrier techniques.
For boundary mics the direct and reflected sounds that combine at the
reflective surface give several dB of wanted free gain. For other
barrier techniques, like a Jecklin Disk, an absorptive surface is
ideal to reduce unwanted phase cancellation between direct to the mic
and reflected off the barrier sounds.
-John Hartog
--- In Secomb's <> wrote:
>
> Hi all
> There have been a variety of DIY projects that have been floating
> around. Which material that is used is essential component of any such
> project. I have been under the assumption that harder and smoother the
> material, the greater the sound would be reflected. To me Rich making
> a cube array with wood made sense but a softer material such as high
> density foam will result in less sound reflected towards the mic.
The
> concept of emphasising a particular range of frequency is interesting.
> A little while ago, a mouse pad was used as a Jenklin disk (I think).
> Again a softer material with a slight texture will give less dB when
> compared to wood for instance .
> With those more experienced in sound recording is there a rule of thump
> what are the reflective properties of a variety of material that is
> used in DIY projects. It appears not only the degree of sound that is
> reflected to consider, the tonal quality is also important.
>
> David
>
>
>
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