Tascam PA-20 MKII User manual

Dual Power Means Added Flexibility
For stereo nearfield monitoring, the PA-20 MKII pumps
25 watts per side of continuous power forflatresponse,
accurate reproduction all through the audible spec-
trum, from 20 Hz to 20 kHz. Total Harmonic Distortion
is minimized to 0.05%. For higher-rated speakers and
high-powered mono applications, the PA-20 MKII is
easily converted to deliver 50 Watts into 8 ohms. Just
switch to bridged BTL (Balanced Transformerless)
mode with one rear panel switch, and reconnect the
speaker wires. Sound quality is still almost faultless,
at 0.008% Total Harmonic Distortion.
Protects Speakers Against Damage
The PA-20 MKII features multiple, resettable electronic
protection circuits to guard against destructive turn-on
transients, output overload, DC offsets and output
shorts. Bright LEDs on the front of the unit light up
whenever the protection circuits are engaged, so that
on-going problems can be identified and rectified.
• BTL indicator lamp ensures you know whether
you’re in stereo or bridged mono mode
• Protection mode lamp lights whenever PA-20 MKII is
protecting your speakers are getting during power-
down and voltage irregularities
• Control input sensitivity (and indirectly, how much
signal your speakers are pumping) with one control
• Accepts balanced XLR or 1/4" input jacks
• Connect your speaker wires for stereo or bridged
mono use
• One switch toggles between 25W stereo and 50W
BTL output
PA-20 MKII
DUAL POWER AMPLIFIER
page 1 of 2
Every recording or project studio needs at least
one set of nearfield monitors for critical listening.
And so, every studio needs to power them with
a reliable, clean-sounding power amp that won’t
add distortion to the incoming signal. The
TASCAM PA-20 MKII fills the bill with reliable,
high-performance audio power amplification for
nearfield studio monitoring and other low-level
sound reinforcement applications. With its dual
power, switchable stereo/mono design, it excels
in control room and recording booth applica-
tions, whether it’s powering single speakers,
stereo pairs or bridged series.
Like every TASCAM product, the PA-20 MKII is
built to last, and provides years of trouble-free
service. It combines a rugged power transformer
and quality semiconductor circuitry with a con-
vection-cooled heatsink that dissipates heat
during marathon listening sessions.
Accepts Balanced &
Unbalanced Input
For maximum flexibility, the PA-20 MKII is equipped
with both XLR balanced and RCA unbalanced input
connectors, so it accepts signal from any commonly
used studio equipment. The back-panel inputs are
optimized for+4dBm and -10 dBV levels, respectively
,
minimizing gain staging to a single, front panel sen-
sitivity control. Nearby are well-labeled speaker wire
terminals that make it easy to correctly set up for
mono or stereo use. Setup is fast, easy and problem
free.
Front Panel-PA-20 MK II
PA-20 MK II DUAL POWER AMPLIFIER
POWER PHONES
INPUT
MIN MAX
POWER PROTECTION BTL
• ••
I
I
I
I
I
I
I
I
I

SPECIFICATIONS
Output power at 8 ohms, (1 kHz)
25 Watts minimum RMS per channel in stereo mode,
both channels driven
50 Watts minimum RMS in BTL (monophonic mode)
Total Harmonic Distortion
0.05% (25 Watts, 8 ohms, Stereo mode)
0.008% (50 Watts, 8 ohms, BTL mode)
Intermodulation Distortion:
Less than 0.2%, 70 Hz : 7 KHz (4:1)
Frequency Response
20 Hz to 20 kHz, +0/-1 dB at rated power output
Damping Factor:
80 minimum, 8 ohm load, 20 Hz to 20 kHz
Input Impedance and Sensitivity:
-10 dBV (0.3 V RMS) for rated output,
15 kohm unbalanced at RCA input
+4 dBu (1.23 V RMS) for rated output, 40 kohm
balanced at XLR input
Hum and Noise: 85 dB below rated output
Minimum Load
Impedance: 8 ohms per channel,
Stereo mode
8 ohms, BTL mode
Protection Circuits: DC balance voltage protector
Electronic output power
overload protector
PA-20 MKII
DUAL POWER AMPLIFIER
page 2 of 2
Semiconductor
Complement: 9 transistors, 7 diodes,
2 integrated
circuits, 3 LEDs
Power Requirements: 115/230 volts, 50/60 Hz, AC
switchable, 9 Watts at idle, 90
Watts at rated output
Weight: 9-14/16 lbs. (4.5 kg)
Specifications and features subject to change without
notice or obligation.
0 dBV is referenced to 1 volt RMS
0 dBu is referenced to 0.775 volt RMS
B BALANCED UNBALANCEDA (BTL)
INPUTS
(BTL)
A
B
MODE SPEAKERS
BTL MONO
STEREO BTL (MONO)
+B–
–+
–A+
115V
Rear Panel-PA-20 MK II
For more information about other TASCAM
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