TI Information – Selective Disclosure SLOU
PurePath™ Smart Amp User Manual (TAS5766M/68M)
49
A.4 Parallel Drivers in the Same Box (analog crossover)
A speaker cabinet with a bass driver and a tweeter is supported by employing excursion
protection exclusively to the bass driver. The analog crossover frequency is assumed to be high
enough such that the tweeter is not damaged by excursion. Thermal protection may be
employed to the bass driver or the tweeter – whichever driver has the worst-case thermal model.
To determine the worst case, both bass and tweeter drivers need to be characterized thermally.
The driver that results in the lowest power handling (as shown in the SOA) should be used for
thermal protection. If the result is too conservative, the bass thermal model could be used.
However, the tweeter may not be protected for sinusoidal signals which would require
stress/reliability tests by the customer.
Electro-mechanical Characterization
•
Connections
– Remove the crossover
network and connect the bass driver directly
to the L+/L- (TEST) outputs of the
Learning
Board
.
•
Bl
- Enter the mass placed at the bass driver
when prompted.
•
Sd
– Enter the diaphragm area of a bass
driver.
•
Sp (if applicable)
– Enter the total port or
passive radiator area as measured.
•
In-box SPL for Passive Radiator
– Follow
the steps in the wizard.
Bass Driver Thermal Characterization
•
Connections
– Bass driver to the L+/L-
(TEST) outputs of the
Learning Board
.
Tweeter Thermal Characterization
•
Connections
– Tweeter to the L+/L- (TEST)
outputs of the
Learning Board
.
Tuning
•
Connections
– Reconnect the crossover
network for both cabinets.
o
Left Channel Speakers to the L+/L-
(TEST) outputs of the
Learning
Board
.
o
Right Channel Speakers to R+/R-
outputs of the
Learning Board
.
OR
OR
L
R
L
R
L
R
