62 DAA2 & DAX — P/N 53265:A1 8/24/2011
DAX Digital Audio Amplifiers DAX Installation
Each backup terminal block contains two sets of terminals. One set may be used for “backup in”
applications, the other set for “backup through” applications.
One-to-One Backup Using BDA-25/70V
Figure 3.21 shows the installation of a BDA-25/70V backup digital amplifier onto the primary amplifier.
Should the amplifier portion of the DAX fail, all its messages will still be played by the BDA as
programmed.
Figure 3.21 One-to-one Backup Using BDA-25/70V
One-to-One or One-to-Many Backup Using DAX
BKUP1and BKUP2 terminals on the DAX may be used to connect a backup amplifier to one or
more primary amplifiers.
One backup DAX may be used to back up as many as 31 primary DAX amplifiers. All primary
amplifiers backed by the same backup amplifier must each be wired in the same style or
combination of styles; for example, all wired Class A, or all wired Class B, or all wired with one
Class A and two Class B circuits.
NOTE: In Style 4 wiring arrangements of the DAL (digital audio loop), it is recommended that the
backup amplifier be located closer to the DVC than the primary DAX amplifiers on the DAL.
Each DAX acts as a repeater for the digital audio signal. If a primary amplifier falls off-line, the
backup will not receive the signal if it is further down the DAL chain.
DVC
DVC
DAX Backup
DAX Backup
DAX Primary
DAX Primary
Recommended
Not Recommended
1. Attach four standoffs
at locations indicated.
2. Align BDA
over standoffs.
Attach with four
screws.
3. Attach power
harnesses
(included with
BDA):
Power and Control
Harness
Connections
BDA
DAX
• J1 on BDA to J6 on DAX
• J2 on BDA to J7 on DAX
J2
J1
J7
J6
2. Align BDA
over standoffs.
Attach with four
screws.
3. Attach power
harnesses
(included with
BDA - refer to
Figure 4.4 on
page 70):
• J1 on BDA to J6 on DAX
• J2 on BDA to J7 on DAX
NOTE: Each backup terminal block contains two sets of terminals. One set may be used for
“Backup In” applications, the other set for “Backup Through” applications.
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