LessLoss FirewallPrice: $4686

Website: www.lessloss.com

Colin said: The Firewall is an ultra-high-performance device that makes everything about my system sound substantially better and nothing worse. It’s not inexpensive, but it will surely find a home with those who are sure they’ve found the right amplification, source, speakers, and cables, but can’t help wondering if there isn’t something more to be had from them. It’s a pretty safe bet that the LessLoss Firewall will prove to them that there is something more -- and perhaps a lot more than they might think possible.

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Read the Ultra Audio review.

The gist: Expensive but, according to Colin, worth it.