HOW I DID THE DEEP
BASS AND LFE TESTS
First, for those beginners who may be reading this, there are 2 types of
bass signals that may be directed to your main speakers and your
sub-woofer. The first is Deep Bass which is normally present in music, and
the second is LFE (Low Frequency Effects). This is the .1 channel in a 5.1
surround system. According to Dolby Labs, the LFE channel delivers
bass-only information (less than 120 Hz) and it's purpose is to supplement
the overall bass content of the program or to ease the burden on the other
Source: Discwasher Home Theater Setup Disc - Silver Edition (DVD)
Signal: PCM 96 kHz/24 Bit Hi-Res stereo and 48 kHz/16 Bit were tested with
the same results.
Song: Blues for Danny
Front speakers set to Large: No bass was directed to SW (sub-woofer).
Front speakers set to Small: Bass was directed to SW.
Results: The 563 handles PCM from DVD in the same way it handles regular
CD and MP3 music.
PCM Deep Bass test - 20 Hz to 80 Hz tone (pink noise) - stereo
Front speakers set to Large: No bass was directed to SW (sub-woofer). Full
bass in main speakers.
Front speakers set to Small: Bass was directed to SW. Faint bass in main
Results: The crossover frequency seems to be 100 Hz. The 80 Hz signal sent
to the Small main speakers was several decibels down.
Dolby Deep Bass test - 20 Hz to 80 Hz tone (pink noise) - stereo
Same results as the PCM test.
Dolby Digital 5.1 and DTS (5.1) LFE
Results: The LFE signal went only to the SW regardless of speaker size
Source: Avia - Chapter 7 Reference Tones - Dolby Digital 5.1
Low Frequency Sweep (Deep Bass) from 200 Hz to 20 Hz.
Large L, C, R, Small Rears: No bass was directed to the SW in the L &
R channels, but bass was directed to the SW in the C and Rear channels.
Large L, R, Small C and Rears: No bass was directed to the SW in the L
& R channels, but bass was directed to the SW in the C and Rear
Small L, C, R, Rears: Deep Bass was directed to the SW in all channels.
Large L, C, R, Rears: Deep Bass is NOT directed
to the SW from any speaker.
The only thing unusual here is that the 563 didn't seem to care if the C channel
was set to Large or Small if the Rears were set to Small. It directed C channel
Deep Bass to the SW in each case.
NOTE: For those who want to use an external ICBM for Bass
Management, set ALL speakers to Large.
Low Frequency Sweep - LFE - 100 Hz to 20 Hz
Results: Regardless of speaker size settings, only the SW was active with the
Low Frequency Pink Noise (Deep Bass) - 6 Channel Pan - Dolby Digital 5.1
Large L, C, R, Small Rears: No bass was directed to the SW in the L & R
channels, but bass was directed to the SW in the C and Rear channels.
Small L, C, R, Rears: Bass went to each speaker and was directed to the SW in
Results: This test reconfirms the results of the other tests. In each speaker
setting, sound pressure remained constant indicating that Bass Management is
working as intended on my system.
DVD-Audio and SACD
Billy Joel "An Innocent Man" stereo SACD
Steely Dan "Everything Must Go" DVD-A, Stereo 192 kHz/ 24 Bit
Results: With each title, regardless of speaker size setting, the SW was active.
The 563 handles Deep Bass and LFE material pretty much the way you'd expect it
to. The only surprises are that it treats the Center channel as a Small speaker
(even when it's set to Large) if your Rear speakers are set to Small. Also, if
you have the SW turned off, LFE is not directed to your main speakers.
Regardless of this, the system works very well. Of course, like any player, the
Bass Management only works when you are using the Analog output on the DV-563A.
When watching a DVD movie or listening to CDs or MP3s, most people will probably
use the Digital output of the 563 and Bass Management would then be handled by
your AV Receiver.