Vifa
PL14WJ-09-08 + Vifa XT25TG-30-04
Compact bookshelf
monitor
Copyright 2009 © Troels Gravesen
Go to d'Appolito version
 
Download pdf data sheets on drivers:
Vifa PL14WJ09-08 - - Vifa XT25TG30-04
The PL14WJ09-08 is
to my ears one of the most smooth sounding 5"
drivers ever made and no wonder it has been a steady
driver in the Tymphany program for years and years. Due
to cone geometry, coating and suspensions, it's got an
even response all up to 7-8 kHz, allowing simple
crossover construction. It's not particularly efficient,
but the result is decent bass response down to 50 Hz in
suggested cabinet. With a Qt = 0.36, it's a perfect
driver for box simulation. Overall system sensitivity is
around 84-85 dB/2.8 volts.
The XT25TG tweeter is a well-proven tweeter too, so no
further comments on this driver.
Box Calc.
Volume will be slightly reduced from drivers, bracing,
port and crossover, but even with
11 liter volume port dimensions can be maintained without
change to overall performance.
You may produce a higher cabinet to reduce depth from
adding volume to the bottom of the
cabinet. Maintain placement of drivers with regard to
upper edge of cabinet.
Crossover
Parts list for the 2-way system.
Finished crossover.
Measurements
 
Left: SPL of drivers
in cabinet without crossover. Right: Merged SPL from
final system @ 2.8 volts/1 meter distance.
 
Left: Point of
crossover is 3.4 kHz. Right: Final system impedance.
Minimum is 4 ohms at 600 Hz.
d'Appolito version
Copyright 2009
© Troels Gravesen
 
Appetite for more PL14s? Here's a d'Appolito version.
Cabinet
Use vent 50 (ID) x 65 mm to produce port tuning ~48 Hz.
Crossover
Suggested crossover components.
Measurements
.jpg) .jpg)
Left: SPL of drivers mounted on shown front panel.
Right: SPL from finished system @ 2.8 volts, 1 meter
distance. Blue = minimum phase.
.jpg) .jpg)
Left: Blue = inverted tweeter polarity. Right: System
final impedance.
Tweeter attenuation/R1011: 0R (red), 0R47 (green), 1R0
(blue). Take your pick!
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