DACS PPA

£128.40 Inc. VAT

Towards the end of 2006 we redesigned the DACS OKM PPA to make the PPA 2.

The new unit uses a THAT low noise transistor array and provides a comparable output level to the A3 adaptor by giving a small amount of amplification. The old unit provided an output level around 12dB lower than the A3, which meant that in quiet surroundings mic amp noise and hum picked up from stray fields by the transformers became significant. The old unit performs best in high sound pressure level situations.

Available on back-order

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Description

DACS PPA is a Phantom Power Adapter designed to work with Soundman’s OKM II Binaural Microphones

Towards the end of 2006 we redesigned the DACS OKM PPA to make the PPA 2.

The new unit uses a THAT low noise transistor array and provides a comparable output level to the A3 adaptor by giving a small amount of amplification. The old unit provided an output level around 12dB lower than the A3, which meant that in quiet surroundings mic amp noise and hum picked up from stray fields by the transformers became significant. The old unit performs best in high sound pressure level situations.

The new unit is still powered by the Phantom power from the mixer or recording device, but is much less susceptible to hum fields due to the transformer-less design.

Tests were done with a pair of OKM mics in our studio using the A3 adaptor, the old PPA and the new PPA 2. It became evident that the new design was very sensitive to rumble, so it was changed slightly to provide a gentle roll off at low frequencies, and then matched the A3 better. ( A3 in flat position) The frequency response is flat from above 20k to 60Hz (-3dB) and -10dB at 20Hz. This was virtually the same as measured on the A3 in its “flat” position, and better than the old transformer coupled PPA

If ultra LF is required a custom unit could be made with larger value coupling capacitors as in the initial design. This would give a -3dB point of 6Hz for the PPA 2, but handling and wind noise from the OKMs are then very apparent.

The signal handling capability and noise performance of the PPA 2 are virtually identical to the A3 adaptor, but being phantom powered it needs no battery. Also the outputs are on balanced XLR rather than unbalanced mini jack, so can be plugged directly to industry standard mic inputs.