Frequently Asked Questions

Is it possible to use an OSIX suspension for different microphones?  page top

Not really. Each suspension is optimized for a precise configuration. A bad adaptation results in two principal disadvantages:

  1. If the microphone is too long and/or too heavy for a suspension (Neumann KMR 81 in a OSIX 2 for example), the vibratory insulation is certainly very good, but the firmness of the microphone mounting is definitely too flexible (much "swing"). Moreover, the insulators being very easily solicited (important movements), the risk of break increases appreciably.
  2. If the suspension is too stiff for the microphone (Sennheiser MKH 50 in an OSIX 3-60 for example), the firmness is excellent, but the vibratory insulation is not maximum.

In both cases, the axis of the support (pole) risk to be badly placed for a good balance of the microphone.

Lastly, if the diameter of the microphone is too small, the strap gripping force can be insufficient to ensure a correct security of the microphone in the cradle.

Are the OSIX suspensions fragiles?  page top

"To be good, a suspension cannot be in wood"

The materials used are resistant, but the need for flexibility, lightness and compactness imposes some precautions:

  - The plastics are not breakable, even with extreme temperatures, but it is preferable not to use solvents for their cleaning.
  - The foam rubber (EPDM) resists well to tears, but it's better to avoid too intense or repeated frictions.
  - The insulators are made of stainless metal, with an elastic limit higher than a simple "piano wire", but it is necessary to avoid them too strong and repeated elongations to prevent any risk of folding or break. First models of OSIX prototypes were equipped with protective bumpers, but those harmed the effectiveness and increased the obstruction of the suspension.

For all these reasons, it is recommended to take care of suspensions OSIX, in particular at the time of transport. Carrying cases are being studied, but it is difficult to propose solutions adapted to all situations.

Is there any need for a low cut filter when using an OSIX suspension?  page top

Yes there is, as any other suspension.

OSIX ones hardly filter the audible bass frequencies, but produce increased infra bass frequencies. Except for any aesthetic choices, the ideal is a steeply sloping filter (min. 12dB/oct.) but there is no need to have a high value cut off frequency. Attention should be given to the filters on the microphones themselves as they do not often respect this rule ! As an exemple, the integrated filter of the Sennheiser MKH 50 microphone is quite "soft". Audible bass are reduced, but it is not really effective for infra bass. In that case, it's better to activate one of the filters normally fitted in a mixer or a recorder. In the contrary, the first filter of the Schoeps CMIT is perfectly adapted, and it's not necessary to use an extra filtering.

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