Royer Mod Mod?

[PhilGood]

I built 3 of the Royer Mods. One was an MXL 2001 and 2 were MXL V67's. I really wanted to see how they compare to really high end mics, so I loaned them to a friend who has a pro studio here in L.A. I asked him to tell me if they were any good and how they rated. He fell instantly in love with them and asked if I would make him a pair. He also asked if there was a way to add a -15db pad to them. Does anyone know how I would do that? It should be just adding the right resistor and a switch after the capsule, right?

 

[Marik]

It should be just adding the right resistor and a switch after the capsule, right?

No. It should be a capacitor right after the capsule, switchable to ground.

 

[crazydoc]

SW1 and C1 in this schematic, courtesy of Flatpicker, I think. I assume the amount of attenuation is a ratio of the capacitance of C1 and the capsule, so to be accurate you'd have to know the capacitance of the capsule. Alternatively, you could measure the output of the mic and switch in different capacitances until the desired amount was attained.

 

[PhilGood]

SW1 and C1 in this schematic, courtesy of Flatpicker, I think. I assume the amount of attenuation is a ratio of the capacitance of C1 and the capsule, so to be accurate you'd have to know the capacitance of the capsule. Alternatively, you could measure the output of the mic and switch in different capacitances until the desired amount was attained.

Hmmm... I think I got it. A small value capacitor from the diaphram to ground before the first cap(.1uF in my case). Does this just drain some of the voltage before the tube? The type of capacitor is going to be important as well, right? Polystyrene, Polypropylene, NO ceramic? Does it matter?

Does this schematic also mean if I want to add a highpass filter, I add a switch, capacitors and resistors before the last output capacitor? (following the same circuit) I'm assuming the lower the capacitor value, the more bass is cut.

Aarrgh! I always get it backwards.