That Audioquest NRG-2 is about the minimum I would suggest for a DIY project. The Audioquest NRG-4 and NRG-5 cables are much better. The NRG-5 actually has the best copper but it is 14awg. The NRG-4 still has very excellent copper, but it is larger at 13awg. All of my cables are Audioquest NRG-4 that have been chopped and terminated with Furutech FI-28 rhodium plugs. Each one is pretty much a $400-450 investment, but I think it will outperform many other manufactured cables that are a lot more. The NRG-4 and NRG-5 cables are more expensive, of course.
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You don't necessarily have to replace the IEC inlet on the Marantz. You can if you want, but you really have to look inside to see what the stock inlet is like. Sometimes they are attached/mounted directly on a circuit board and you cannot do anything with this. If it's a standard inlet with wires attached via clips, you can replace it. Furutech makes several IEC inlets and some have a built-in filter. I would recommend the rhodium, as gold-plated will increase the warmth and roll off the highs on the Marantz.
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The fuse is something that you only have to buy if it blows. It does not require any sort of maintenance. However, stock fuses are not always the best sounding. I recommended the Hi-Fi Tuning silver fuses because the Marantz is so warm and needs all the "silver" you can get to increase the speed and resolution. Of course, if you want to see how the Marantz sounds "stock", that's totally fine. You might feel just fine with the sound. If you do get the fuse, be aware that it has a 12-14 day burn in (you need to keep the Marantz turned on 24 hours a day for about 2 weeks). The fuse will go through all sorts of changes, from sounding bright/harsh in the midrange to very warm/mushy.
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I will also agree with caphill that you should NOT get any Rotel amp that is a Class D circuit. They will sound weak and anemic and will not have bass impact or be engaging at all! The normal Rotel Class AB amps are very excellent, however.
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You don't necessarily have to replace the IEC inlet on the Marantz. You can if you want, but you really have to look inside to see what the stock inlet is like. Sometimes they are attached/mounted directly on a circuit board and you cannot do anything with this. If it's a standard inlet with wires attached via clips, you can replace it. Furutech makes several IEC inlets and some have a built-in filter. I would recommend the rhodium, as gold-plated will increase the warmth and roll off the highs on the Marantz.
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The fuse is something that you only have to buy if it blows. It does not require any sort of maintenance. However, stock fuses are not always the best sounding. I recommended the Hi-Fi Tuning silver fuses because the Marantz is so warm and needs all the "silver" you can get to increase the speed and resolution. Of course, if you want to see how the Marantz sounds "stock", that's totally fine. You might feel just fine with the sound. If you do get the fuse, be aware that it has a 12-14 day burn in (you need to keep the Marantz turned on 24 hours a day for about 2 weeks). The fuse will go through all sorts of changes, from sounding bright/harsh in the midrange to very warm/mushy.
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I will also agree with caphill that you should NOT get any Rotel amp that is a Class D circuit. They will sound weak and anemic and will not have bass impact or be engaging at all! The normal Rotel Class AB amps are very excellent, however.