Tones played simultaneously on two speakers. If the speakers are "in phase," the sound localizes perfectly between them. If they are "out of phase" (wired backward), the sound becomes diffuse, hollow, and lacking in bass. Subwoofer Crossover Tests:
is a relic of a bygone era, but it remains a functional and essential tool for legacy systems. The Ultimate 5.1DD DTS Surround Test-DVD - -R.K...
: Often preferred by audiophiles, DTS is less compressed than Dolby Digital, supporting higher bit-rates of up to Tones played simultaneously on two speakers
A hidden killer of audio quality is "out of phase" speakers (positive and negative wires crossed). This disc includes tests where a voice announces "In Phase" and "Out of Phase." If your speakers are wired incorrectly, the audio will sound hollow, thin, or like it is coming from inside your head rather than the speaker. It is a critical diagnostic tool that saves hours of troubleshooting. Subwoofer Crossover Tests: is a relic of a
Features for balancing speaker levels and ensuring proper phase for each of the five full-bandwidth channels (Front Left, Center, Front Right, Surround Left, Surround Right) and the Low-Frequency Effects (LFE) channel.
: A competing format known for higher bitrates (up to 1.5 Mbps vs. Dolby's 448 kbps on standard DVD), which many audiophiles prefer for its perceived depth and detail. Secrets of Home Theater and High Fidelity Typical Contents of a Surround Test DVD A "Test-DVD" of this nature generally includes: Channel Identification