Very strange HP Passive network for TAD 4001

[TADonly]

The following High-Pass passive network for TAD 4001 use a 2.7uF capacitor. Any one know the effects of this capacitor? Thanks in advance.

 

[soongsc]

This is normally used to reduce HF impedance so that high frequency is balanced. Just a guess!

Any other comments?😕

 

[Feyz]

Likely to lift the upper end

 

[GM]

Greets!

Right, this is a HF bypass cap to 'lift' up the HF to counteract the shelving due to the series resistance. Standard CD horn EQ.

GM

 

[TADonly]

Thanks GM,Feyz,Soongsc!!
Is there any formula to calculate the frequency where lifting begin and the values of capacitor?

 

[soongsc]

I would recommend using a simple SPICE program to do some simulation, and just look at the results.