Cables and interconnects are highly controversial subjects and easily end up in a stew of religion and science. I recall someone mailing me about his speaker cables first reaching full potential after 300 hours of burn-in. This is way after I have left the party! Trying out new cables I always go back after a couple of weeks to my former cables to hear if I miss something.
What I've had to realise over time is that I have discarded cables and interconnects due to my system not being good enough for revealing its qualities and trying the same thing at a later stage all of a sudden became an improvement in level of transparency, because level of transparency is usually what we're after.
The cables and interconnects seen below is what I use for the time being. This is in no way a recommendation and you may find alternatives that better suit your taste, but I have found these to be a good compromise between cost and performance. In fact cables made from these components will cost you a fraction of some ready-made "super" cables.
I do believe there are differences between cables and interconnects, but we need good gear to hear the difference between two interconnects going from e.g. your preamp to the power amp. Maybe we have severe bottlenecks somewhere else in our system that just doesn't allow us hearing so. There's always the risk that a smooth and easy-on-the-ear cable in fact covers deficiencies in the overall chain of components. If the cable is edgy and aggressive, maybe it's because your system is so and the cable is only a bit more "hifi".
For speaker cable
and speaker internal cabling I use PTFE insulated silver plated
copper. I know you can find people stating these are rubbish and you
need this or that, but there's no other way than try it out for yourself.
Some supplier links are shown, but please do not ask for links to suppliers of all the components used below because I haven't kept them. Use google, eBay and the usual suppliers of hifi paraphernalia, e.g. http://www.hificollective.co.uk/components/wire.html. Many of the things you can buy at e.g. hificollective you can find cheaper on eBay, but it takes time to find the dealers and I have to say I'm amazed from what hificollective has managed to put together over the years; quite a range of products. Highly recommended, fast delivery.
I use these for connecting the midrange/tweeter cabinets to the crossover in my larger speakers. With 7 mm spades held firmly in place by the terminal block screw I doesn't get any better - and it costs nothing. I would like to use these for my amps and speakers in general, but I don't due to convenience. I swap gear a lot and banana plugs are faster. They are now available from Jantzen Audio in gold plated quality. They come with four or two connections.
For mid and tweeter internal cabling I use Jantzen Audio 16 AWG silver plated copper with PTFE insulation.
Tone arm cable
For my turntable I used to make my own cables, but I found these on eBay, made by a guy in Aberystwyth, Wales, and the price was right. Pure silver wires and really nice work. 131 £. I once stayed in Aberystwyth for a night on a Wales holiday week. I love this town and I like these cables just as much.
I found this in Munich at the High End show and it find it ridiculous. Behind the wall most likely standard 1.5 sqmm installation cables - and then this monster. I don't say it doesn't work - but if it does, it works as a filter. I've never heard fancy power cords to improve my system, but I'm open for suggestions - - -
Next I bought four power chords, SUPRA LoRad SPC, 3 x 2.5 mm≤. For the workshop system I bought Supra shielded cable, 3 x 1.5 mm^2, and Supra plugs and made the cables myself - which really didn't save me a lot of money.
Now - for the first time - my hifi appliances are grounded and did it all help? It did. In particular in the treble range. Less smear, more smoothness and transparency. I'm not done with this - and I would like to borrow a true power conditioner like the P S Audio Regenerator and hear what it does. Damn... they're expensive. If it works, I'll buy one.