Post by rascalaudio on Jun 5, 2014 22:25:08 GMT -6
For anyone racking up some PM1000 channels, or using a PM1000 for summing, etc., here is a simple EQ mod that makes these oddball EQ's much more musically useful.
Here is the EQ section of the schematic:
And the component layout of the EQ section on the pcb:
The components you're concerned with are the cluster of caps and resistors immediately above the 180mH inductor at the middle/top of the component layout picture.
Change the 270R resistor to 390R
Change the first 330R to 472R
Change the next 330R to 604R
Change the 150nF cap to 1u2 (all film caps)
Change the 68nF to 180nF
Change the 33nF to 20nF
Change 47nF to 33nF
The 150R resistor is unchanged.
Your new EQ points will now be: LF = 100Hz shelf (unchanged), Mid = 350Hz, 1k2, and 5k, peaking, HF = 12k shelf. And for the mid band the Q is wider now too, making the EQ much more musical rather than simply corrective.
Enjoy,
Joel
Here is the EQ section of the schematic:
And the component layout of the EQ section on the pcb:
The components you're concerned with are the cluster of caps and resistors immediately above the 180mH inductor at the middle/top of the component layout picture.
Change the 270R resistor to 390R
Change the first 330R to 472R
Change the next 330R to 604R
Change the 150nF cap to 1u2 (all film caps)
Change the 68nF to 180nF
Change the 33nF to 20nF
Change 47nF to 33nF
The 150R resistor is unchanged.
Your new EQ points will now be: LF = 100Hz shelf (unchanged), Mid = 350Hz, 1k2, and 5k, peaking, HF = 12k shelf. And for the mid band the Q is wider now too, making the EQ much more musical rather than simply corrective.
Enjoy,
Joel
