I received a Marantz 6005 a few days ago and have been auditioning it since then. I've also auditioned, over the last four weeks, the Yamaha RX-V667, Marantz SR5005, Denon 3310, Pioneer 1120, and Onkyo 808. So how does the 6005 compare to the others? Here are my thoughts:
Sound Quality: No surprises here. Having loved the sound quality of the 5005, the 6005 performed equally as well. As noted in a prior post, I had never listened to anything powered by a Marantz prior to auditioning the 5005, having previously used either Denon or Yamaha receivers. There's just something special about the Marantz sound that sets it apart from the others. It has a full-bodied, life-like sound that gives it a pleasing depth and range. Perhaps this is what others refer to as "warm." Whatever it is, it's absolutely wonderful. I'd rank (subjectively) the Onkyo and Yamaha second and third, respectively, in the sound quality department, with Denon and Pioneer bringing up the rear.
Video Quality: As noted in a prior post, the 5005 seemed to add a slight purple tinge to video images. The 6005's higher quality ABT chip appeared to fix that shortcoming, with no noticeable degradation in video quality (whether it improved the quality, I couldn't discern). By comparison, the Onkyo 808 appeared to give images a slightly greener hue.
GUI: The 6005 also overcame the 5005's GUI shortcomings. While the 5005 had a black & white on screen display that didn't overlay on images, the 6005 has a much easier to use color GUI that overlays. While the 6005's GUI isn't quite on par with Yamaha's (which has the best GUI I've encountered), I really have no complaints.
Remote: The 6005's remote is essentially the same as the 5005's, with a small LCD window at the top that indicates the source being controlled. It won't win any awards, but certain third party remotes are clearly much better than any stock remote provided with a receiver.
Other Features: I encountered no issues when plugging in my iPhone to the USB connection. Worked just fine. And if looks are important, the Marantz's understated, brushed aluminum facade is nothing short of classy.
Overall, I rank the Marantz 6005 as the best receiver I've auditioned. And after enduring a range of comments from my wife regarding why I have been purchasing so many receivers, the 6005 will also be the last receiver I'll audition for at least the next few years. This one's a keeper. Granted, the 6005 doesn't win any awards in the value department and it was the only receiver where I paid full price. But I confidently believe it is worth it.