Advertisements Excellent!!! This is surely a strange problem. It will be interesting to find what is actually at the root of it. If you cascade two two way splitters that will result in approx 7-7.5db of attenuation. Cascading splitters leaves open outputs which really should be terminated to minimize signal leakage and potential interference. However, it should work ok for testing. Instead of a bunch of 6db's you might want to get 3db's and get a bit better fine tuning capability.