I realy forgot about BAT -- they have either balanced or SE outputs in their regular configuration. Placette has also balanced out versions and I would recommend to stay with one output device either balanced or SE.
In order to take the most advantage of having passive preamp please MEASURE before you build!
Find out an output level of your CD-player with manufacturer or user manuals and sencitivity, input impedance of your amplifier. You have to have +-1V above the input sencitivity of your amplifier for uncompromised dynamics.
For example if your input sencitivity is 1V and the output of your CD-player is 1.5V then you'll most-lilely need extra 7dB of voltage gain and have to avoid using passive preamp.
There is a decibel conversion table you can check at http://www.testeq.com/charts/decibels.lasso
In order to take the most advantage of having passive preamp please MEASURE before you build!
Find out an output level of your CD-player with manufacturer or user manuals and sencitivity, input impedance of your amplifier. You have to have +-1V above the input sencitivity of your amplifier for uncompromised dynamics.
For example if your input sencitivity is 1V and the output of your CD-player is 1.5V then you'll most-lilely need extra 7dB of voltage gain and have to avoid using passive preamp.
There is a decibel conversion table you can check at http://www.testeq.com/charts/decibels.lasso