Matrix, unless you sense a slight loss of dynamics and/or softening or absence of low frequencies, you are driving yr amp ok.
The matter of impedance "matching" Jeffreybehr refers to applies in cases where you need to transfer max energy -- in which case you need the same impedance (typically 600ohm). You're transfering voltage.
On the subject of hi freq reproduction: equip that can play say 100kHz +-0,1db is useful for its apparent speed, not because we can hear those freq. It just shows how linear a reproduction can be across a wide freq band. As an example, my amp specs 100kHz 0,1db/500kHz 3,1db 2MHz -12db. It's not quite linear; the losses accelerate as you go up.
The matter of impedance "matching" Jeffreybehr refers to applies in cases where you need to transfer max energy -- in which case you need the same impedance (typically 600ohm). You're transfering voltage.
On the subject of hi freq reproduction: equip that can play say 100kHz +-0,1db is useful for its apparent speed, not because we can hear those freq. It just shows how linear a reproduction can be across a wide freq band. As an example, my amp specs 100kHz 0,1db/500kHz 3,1db 2MHz -12db. It's not quite linear; the losses accelerate as you go up.