With cables, interconnects and power cords, things can get really tricky, to such an affect where you can spend a fortune on the finest cables and still it's not quite right. What I've found is that quite often far too many people ignore the importance of basics. With basics, I'm referring to AC mains distribution and AC mains wiring with dedicated CB's at the mains board. Once this is done, only then will any good quality cables work just about right.
I've seen some lofty gear with high powered monoblocks being plugged into cheapo plastic power boards that you can get at Kmart for $20... c'mon seriously?
Then, I've seem some other lofty gear being plugged into power boards, power conditioners and them using multi-plugs to accommodate other devices simply because they ran out of AC outlets .. c'mon.
So first and foremost, please get those AC mains outlets sorted out with a good quality power boards then you're going in the right direction.
Over the decades I've used various types / brands from Chord, Monster, Van Den Hull, Audio Quest, Audio Note, Cardas, DH Labs, Kimber, MIT, and a few others I can't even recall. They're highly system dependant and will enhance certain things to great affect. OTOH certain cables and types of wiring materials can even slow down certain aspects of a system. So, I've always looked for something that offers the highest levels in transparency, speed and detail, and something that gets out of the way. Is far more neutral and far less coloured than the source gear itself! There are certain recordings that are overly done, boosted in certain frequencies and with certain types of cables, these areas are further enhanced, so people think they're great but in fact it's a bit artificial, and not so natural.
Once you get hold of good quality recordings then that's the best start! Trying to preserve this quality recording as the original signal passes along the chain and onto the speakers in its purest form, is so crucial it can either make or break a system's overall performance.
One cable brand that I've found to be consistent with utmost Fidelity to the core, and every model of theirs is simply stunning as you go up the chain but it gets so damn pricey that sometimes I think this company is nuts! I've seen how they work and it takes something like 8hrs just to make 1 meter.
So I managed to settle with what I can afford and installed a full cable loom of the same brand within the same series, ending up with a higher grade connection on the speaker cables, since this is where the signal ends.
That brand is Nordost and I've found them to be truly worth when making the connection.
Cheers, and enjoy those fine tunes!
RJ