600 ohm attenuator frequency all over the place

[kambo]

i hooked up a 600 ohm variable attenuator to ez1290 output,
when i pull down more than 4-5 db at the output, frequency response goes crazy ?

any idea,

cheers
kam


edit: oops, sorted, it was connected to passive summing, with one CH active, that was changing the Z,

 

[ruffrecords]

Wired up wrong??

Cheers

Ian

 

[kambo]

Wired up wrong??

that what i was thinking too...
then realized i was testing through passive summing mixer as gain make up... only with one channel...
i suppose it was messing with impedance of mixer!
connected direct and its working