Based on my experience with both a dedicated line and a Niagara 5000, I'd recommend the 5000. I noticed no difference in sound quality after installing a dedicated line. However, including other tweaks I've made, I'd say the effects are cumulative and beneficial, but nothing compares to the 5000, which provided instant gratification. The 5000 I borrowed was completely burnt in, but I found it sounded its best, after being turned on for 48 hours. I recommend the 5000.