I had pretty much settled in to needing two RR-77s, until several days ago when Andy Quint asked about pictures with a AR QR-8 placed on it. I found such a picture in the 6moons' review and posted it for him. I then thought that I had not tried it and so might just do so. I really wondered why the QR-8 was put inside the RR-77. It was put on the plastic bottom of the unit, and it seemed to me that it would make no difference whether it were on the top or bottom. Nevertheless, I put it inside. I did this in the early afternoon and was then out until 8 that evening, when I did some listening, having forgotten that I put the QR-8 on.
Frankly, I wondered what was wrong with my amp. The singers were all 20' behind the instruments on the left and right sides. I put off trying to resolve this that night. Only later did I recall that I had put the QR-8 within the RR-77, but I thought certainly that cannot be the problem. I thought this because I had always thought that the RR-77 gave a nice improvement but not of the magnitude that the QR-8 could have killed it.
The next day I removed the QR-8 and bingo I was back in business. The RR-77 does have that big an impact as can the QR-8s on it. Once earlier I had experienced such a dreadful impact of the QR-8s, when I put one into the drawer of my cd player. I have experience very great improvements using the QR-8s, however, especially in the center of the wall behind my speakers and in the center of the windows behind my speakers.
My biggest conclusion, however, was that you really need to work with the Acoustic Revive RR-77 to maximize its benefits. I had just concluded that I needed two and that they both needed to be as close to 5 feet off the floor as possible. Wrong! Five feet is a starting point, the minimum. Also IMHO they cannot be close to the walls. Both of mine are more than two feet from the walls and largely centered on the front and back ends of the room. I wish the RR-77s had a tripod threaded base so that I could experiment further with distance into the room as well as with height. I have found that changes as small as 1 inch in height in the front unit made a difference.
Having seen explanations of how these things work, I wonder about having one right above me in my listening room. My wife is tolerant and already thinks I am nuts, but doing that might be a bridge too far.
All I am trying to say here, is that these units and also QR-8s are very powerful and that trial and error is the only way to optimize them.
