Eek. Three splices and you expect it to work properly? Every
time you splice a wire you loose 2-4db per splice.

Huh? If every splice in a wire had a resistance of a few ohms, our houses
would burn down. Think about the number of splices between you and the
power generating plant.

A soldered splice has no more resistance than an unbroken wire. A good
tight solderless splice can also be very good.

If you are losing 2 to 4 dB per splice, adopt a different splicing
technique! Or are you thinking of VHF cables where there is an unavoidable
impedance mismatch? That doesn't apply at audio frequencies.