The Pleiades filters seem to be a very easy, effective and high quality sound way to compensate for the Fletcher-Munson curves, voice effort curves etc.
So using the right cutoff frequencies flat frequency responce to listener's brain at the desired listening intensity may be achieved.
The Pleiades filters are just inductors in parallel with the signal output. The low cut filter is made by the inductor and the preceding driving output impedance.
There is nothing in series with the signal output we want to process.
They can be easily made by winding Magnetec Nanoperm ring cores.
The slope is only 6dB per octave.
Many filters can be made (the cutoff frequency according to the number of turns squared) and each one dialed in by a rotary switch. Slopes can be adjusted by connecting a valuable series resistor to the coil. Is this hiw the MD421 filter operates?
Even less filters can be used if parallel combinations of them are switchably arranged, see other Euroelecron post.
For gentle high frequency cut, capacitors in parallel or inductors in series can be used and if needed variable resistors in a similar way.
As we know from legendary vintage EQs inductors sound great on audio production.
Pleiades filters are 1st order (described by 1st order differential equations), gentle slope and sound great, natural and transparent.
No comments:
Post a Comment