In short do the "Bolero Test" with your source directly connected to the poweramp.
And go with Arthur Salvatore's 2 closing statements:
1/ "In short, if you need an active line stage because your source is not up to the task of driving the amplifier(s), then...
Any good active line stage, from any era, will improve the sonics in some obvious and clear manner"
2/ "Alternatively, if your source is up to the task of driving your amp(s), then...
No active line stage, no matter how good it is, will ever equal the sonics of your direct connection (or an equivalent passive)"
Cheers George
And go with Arthur Salvatore's 2 closing statements:
1/ "In short, if you need an active line stage because your source is not up to the task of driving the amplifier(s), then...
Any good active line stage, from any era, will improve the sonics in some obvious and clear manner"
2/ "Alternatively, if your source is up to the task of driving your amp(s), then...
No active line stage, no matter how good it is, will ever equal the sonics of your direct connection (or an equivalent passive)"
Cheers George

