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For best performance, always use "first-surface" mirrors in your
Tip
rear-projection installation (as opposed to conventional,
"second-surface" mirrors with the reflective surface behind a transparent
substrate such as glass or acrylic).
First-surface mirrors provide a strict reflection without the "ghosting"
effect seen with a second surface mirror, where a faint secondary
reflection could be observed coming from the front surface of the glass.
Due to its extraordinarily high level of video processing performance, the DHD Controller
may distribute video signals with a perceptible level of audio latency. In order to easily
solve this issue, Runco recommends using the DHD Controller with a high-quality audio
receiver that has the ability to effectively synchronize audio and video signals.
Most mainstream audio receiver/switchers have the ability to synchronize the audio and
video to the Advanced Television Systems Committee (ATSC) prescribed tolerances.
According to the ATSC, the sound program should never lead the video program by more
than 15 milliseconds, and should never lag behind the video program by more than 45
milliseconds.
In addition, many video displays and A/V receivers introduce additional latency that needs
to be compensated for during the installation.
Table 3-5 shows the amount of possible audio latency given different signal input timings.
Table 3-5. Possible Audio Latency for Various Input Timings
Input Timing
480i
480p
576i
576p
720p/50
720p/60
1080i/25
1080i/30
1080p/24
1080p/50
1080p/60
Q-1500d Series Installation/Operation Manual
Possible Audio Latency (milliseconds)
133
83
160
100
100
83
160
133
125
80
67
29
Installation
Audio/Video
Synchronization Issues
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