I want an amp that is not speaker dependent.
Impossible.
However you can make a speaker pretty much independent of amplification by making it "active". In this case, the speaker includes the amp in the design process. This type design will playback whatever signal it is given just as it has been designed to do - so what you hear differently between one source/preamp and another will be entirely due to the difference in source/preamp. Studios like active speakers for this reason...plug them into a source signal and you hear the source unaffected by power amp/load interaction...a major variable is removed and a degree of precision/consitsency/translatability is added.