Tascam Stereo Amplifier PA 30 User Manual

9A09572800  
»
PA-30  
Dual Power Amplifier  
OWNER’S MANUAL  
 
IMPORTANT SAFETY INSTRUCTIONS  
1) Read these instructions.  
2) Keep these instructions.  
3) Heed all warnings.  
• Do not expose this apparatus to drips or splashes.  
• Do not place any objects filled with liquids, such as  
vases, on the apparatus.  
4) Follow all instructions.  
5) Do not use this apparatus near water.  
6) Clean only with dry cloth.  
• Do not install this apparatus in a confined space such  
as a book case or similar unit.  
• The apparatus draws nominal non-operating power  
7) Do not block any ventilation openings. Install in  
accordance with the manufacturer's instructions.  
8) Do not install near any heat sources such as  
radiators, heat registers, stoves, or other apparatus  
(including amplifiers) that produce heat.  
from the AC outlet with its POWER switch in the off  
position.  
9) Do not defeat the safety purpose of the polarized or  
grounding-type plug. A polarized plug has two blades  
with one wider than the other. A grounding type plug  
has two blades and a third grounding prong. The wide  
blade or the third prong are provided for your safety. If  
the provided plug does not fit into your outlet, consult  
an electrician for replacement of the obsolete outlet.  
10)Protect the power cord from being walked on or  
pinched particularly at plugs, convenience receptacles,  
and the point where they exit from the apparatus.  
11) Only use attachments/accessories specified by the  
manufacturer.  
12) Use only with the cart, stand, tripod, bracket, or  
table specified by the manufacturer, or sold with the  
apparatus. When a cart is used, use caution when  
moving the cart/apparatus combination to avoid injury  
from tip-over.  
13) Unplug this apparatus during lightning storms or  
when unused for long periods of time.  
14) Refer all servicing to qualified service personnel.  
Servicing is required when the apparatus has been  
damaged in any way, such as power-supply cord or  
plug is damaged, liquid has been spilled or objects have  
fallen into the apparatus, the apparatus has been  
exposed to rain or moisture, does not operate normally,  
or has been dropped.  
TASCAM PA-30 3  
 
Summary of Operating Precautions  
• Do not use the PA-30 if the power cord appears  
frayed or broken.  
• Do not spill liquids into or on the PA-30 chassis. If  
the chassis becomes wet, allow it to dry thoroughly  
before reconnecting the unit.  
If an outlet appears to require repairs, consult a  
qualified electrician - and don't use it. An improperly-  
wired outlet may present a serious shock hazard.  
For reference, Figure 1 shows the characteristics of a  
properly wired US standard three-prong wall outlet.  
• Allow sufficient space at the top, and bottom of the  
PA-30 to permit a flow of cooling air. Keep the unit  
away from radiators or others that produce heat.  
• Never connect the PA-30 outputs to a battery, power  
supply or other voltage source. Do not short the  
output hot terminals together.  
120 VAC  
• The minimum allowable load impedance on each  
PA-30 output is 8 ohms in stereo mode or BTL mode.  
Connecting loads of lower impedance will result in  
current limiting and/or activation of the protection  
circuits.  
Neutral  
Earth  
Hot  
0 ohms  
• Before operating the PA-30, be certain that the  
MODE switch is set in accordance with the desired  
0 Volts  
0 Volts  
operational  
mode  
and  
output  
connection  
120 VAC  
configuration (see the 'BTL Operation' section of this  
manual, page 9).  
• Any unauthorized internal modification to the PA-30  
will invalidate the warranty, and may result in  
hazardous conditions. Refer all servicing to a TEAC  
authorized TASCAM service center.  
• Connect the PA-30 only to properly wired AC outlets.  
Make certain that the voltage is correct for the  
version of the unit that you are using (110 to 120  
volts at 60 Hz for domestic USA).  
Figure 1. Standard wall Receptacle  
Voltage Conversion  
Be sure to unplug the power cord from the AC outlet  
before repositioning the voltage converter switch.  
AC Power Connection  
1) Locate the voltage selector on the rear panel.  
The PA-30 requires a reliable source of single-phase  
power at 110 to 120 volts AC, 60 Hz (domestic US  
version). It has a two-prong, ungrounded AC cord, and  
may be connected to either two-prong or three-prong  
outlets.  
2) Using  
a
flat-bladed screwdriver, set to the  
appropriate 120 V or 230 V position according to  
your area.  
If you have any doubt about the wiring of the outlet that  
you wish to use, it is wise to test it before making  
connections. Simple plug-in testers are available from a  
variety of electronics and hardware stores.  
Figure 2. Voltage Selector  
4 TASCAM PA-30  
 
Features  
Figure 3. PA-30 FRONT PANEL  
If the Protection indicator lights when the PA-30 is  
first switched on, turn the Power switch OFF and  
recheck all of your connections before resetting  
power.  
1. POWER Switch and Indicator  
A two-position rocker-type switch controls power to  
the unit. Depressing the upper surface of the switch  
turns the amplifier on; depressing the lower surface  
turns it off. The green LED Power indicator will light  
whenever the unit is on and is connected to a properly  
functioning source of power.  
3. BTL Indicator  
The orange LED BTL indicator will light whenever the  
MODE switch (on rear panel) is in the 'BTL (MONO)'  
position.  
2. PROTECTION Indicator  
The red LED Protection indicator remains off  
whenever the PA-30 is turned on and is operating  
normally.  
If an overload, short circuit, DC offset or other problem  
triggers the internal electronic protection circuitry, the  
unit shuts down and the Protection indicator lights.  
Once the PA-30 is turned off and the fault condition is  
cleared, the Protection circuit will automatically reset,  
and normal operation can be resumed (provided that  
the fault has not damaged the unit).  
4. INPUT LEVEL Control  
A single rotary variable attenuator sets the input  
sensitivity of the PA-30 Amplifier. The degree of  
attenuation varies from zero loss (maximum  
sensitivity) at the 'MAX' position to infinite loss at the  
'MIN' position.  
5. PHONES Jack  
This Tip/Ring/Sleeve 1/4" phone jack accommodates 8  
ohms or higher impedance stereo headphones.  
TASCAM PA-30 5  
 
Features  
Figure 4. PA-30 REAR PANEL  
If the MODE switch is not correctly set, damage to the  
6. INPUTS (A & B, XLR & RCA Type)  
loudspeakers or to the PA-30 may result. For a  
complete explanation of use of the MODE switch,  
consult the section on 'BTL Operation' on page 9 of  
this manual.  
Two input connectors are provided for each channel:  
one RCA (phono) jack and one XLR-type female  
connector. Either connector may be used on a given  
channel, but both connectors for a single channel  
should not be used simultaneously.  
Both inputs present a high impedance, and cause no  
appreciable loading to source outputs. Input sensitivity  
is –10 dBV (0.3 volt RMS) at the RCA inputs, and +1.3  
dBu (0.9 volt RMS) at the XLR inputs, for rated output  
(with Input Level control at maximum). Pin  
assignments are as follows:  
8. SPEAKERS (A & B)  
A pair of color-coded locking terminals is provided for  
output connections to each channel of the PA-30. They  
will accommodate stripped bare wire, or tinned wine  
ends. The minimum allowable load impedance for each  
output is 8 ohms.  
The actual output connection configuration will vary  
depending upon the mode of operation selected and  
the number and type of loudspeakers used. Please  
refer to the sections on 'BTL Operation' and 'Output  
Connections' before making connections to the PA-30  
outputs.  
XLR-type  
RCA-type  
Pin I = common  
Pin 2= 'high'(+)  
Pin 3= 'Iow'(–)  
Shell= common  
Tip = 'high'(+)  
Virtually any line-level source may be connected to  
these inputs. (Refer to the 'Connection and Installation'  
section for further details.)  
9. Mains Power Cord  
The inlet for AC power to the PA-30 is a two-prong  
ungrounded plug (rear panel mounted). The PA-30  
requires 120/230 volts AC at 50/60 Hz. It draws 8 watts  
at idle, and 130 watts at full rated output.  
7. MODE switch  
A single two-position slide switch (on rear panel)  
selects  
either  
monophonic  
BTL  
(Balanced  
Transformerless, also known as 'bridged', with switch  
set to BTL) or stereo operation (with switch set to  
STEREO).  
6 TASCAM PA-30  
 
Connection and Installation  
Input Connections  
Before making connections to the PA-30 signal inputs,  
find the nominal output level of your signal source (this  
information is usually given in the Specifications  
section of the instruction manual). Equipment  
operating at –10 dBV should be connected to the RCA  
(phono) inputs, while +4 dBm equipment will operate  
best if connected to the XLR-type inputs. (Low-level  
signal such as an electric guitar or phonograph  
cartridge will require an external preamplifier.)  
Components that operate at –10 dBV normally feature  
either RCA or 1/4-inch phone output connectors,  
presenting an unbalanced (two-connection) drive.  
Standard connecting cables and adapters may be used  
with such equipment. If you are making your own  
cables, refer to Figure 5 for wiring details.  
From Source Equipment  
To PA-30 RCA Input  
Figure 5. Connections to the PA-30 –10 dBV Input  
Professional +4 dBm components, on the other hand,  
may feature either 1/4-inch phone or XLR-type output  
connectors, presenting either an unbalanced or a  
balanced drive. In some cases, standard microphone  
cables may be used for such equipment; in others,  
special cables or adapters may be required.  
to this figure when determining the types of cables and  
adapters to use in connecting to the PA-30 XLR inputs.  
Take care to observe the polarity conventions indicated;  
input polarity reversals may cause acoustical phase  
cancellation, resulting in unnatural sound.  
Figure 6 shows the recommended wiring configu-  
rations for a few standard +4 dBm output types. Refer  
From Source Equipment  
To PA-30 XLR Input  
(Two-Conductor Shielded Cable)  
Balanced  
Note: if source is pin 3 "hot"  
reverse pins 2 & 3  
(Single-Conductor Shielded Cable)  
Connect to pin 1  
Unbalanced  
if required by source output  
Note: if source is pin 3 "hot"  
reverse pins 2 & 3  
Figure 6. Connections to the PA-30 +4 dBm Input  
TASCAM PA-30 7  
 
Connection and Installation  
Output Connections  
Each channel of the PA-30 will drive a minimum load  
impedance of 8 ohms. Connecting a load of lower  
impedance will result in current limiting and may  
trigger the Protection circuits to shut down the  
amplifier.  
combined to obtain an optimum load impedance.  
Figure 8 shows what happens to the net load impedance  
when multiple loudspeakers are connected in various  
ways. (In all cases, it is assumed that all speakers in a  
given system have the same impedance.)  
Figure 7 shows a normal stereo-mode connection of  
two individual speakers to the PA-30 outputs. When  
making loudspeaker connections, always be sure to  
maintain correct polarity; if you wire the speakers out  
of phase with one another, you will get acoustical phase  
cancellations.  
There are two basic methods for connecting multiple  
speakers to a single amplifier output: series connection  
and parallel connection. Loudspeakers connected in  
series present a higher net impedance than any single  
unit alone. Parallel connection, by contrast, lowers the  
net load impedance. Sometimes, the two methods are  
Generally, only parallel connection is used in  
professional audio, for two fundamental reasons. First,  
if one of the speakers in a parallel system fails, the  
others will still function. (Remember those old  
Christmas lights that all went out the minute one bulb  
failed? They were connected in series.) Second, parallel  
connection results in a lower net impedance. The closer  
the load impedance gets to the allowable minimum for  
the amplifier, the more efficiently is the amplifier's  
power capability used, since the lower load impedance  
draws more current from the output stage.  
Figure 7. Typical Stereo Output Connection  
Each Unit  
4 OHMS  
8 OHMS  
16 OHMS  
Two In Series  
8 OHMS  
Three In Series  
12 OHMS  
Four In Series  
16 OHMS  
16 OHMS  
32 OHMS  
24 OHMS  
32 OHMS  
48 OHMS  
64 OHMS  
Each Unit  
4 OHMS  
8 OHMS  
16 OHMS  
Two In Parallel  
(2 OHMS)  
Three In Parallel  
(1.33 OHMS)  
(2.66 OHMS)  
(5.33 OHMS)  
Four In Parallel  
Four In Series/Parallel  
(4 OHMS)  
(1 OHM)  
(4 OHMS)  
(2 OHMS)  
(4 OHMS)  
8 OHMS  
8 OHMS  
16 OHMS  
Note: Impedances shown in brackets are  
too low for the amplifier. Do not use three  
loudspeaker configurations.  
Figure 8. Connecting Multiple Loudspeakers  
8 TASCAM PA-30  
 
BTL operation  
The PA-30 rear panel includes a switch that selects  
either normal stereo mode or a special mode termed  
BTL (Balanced Transformerless). The setting of this  
switch determines the maximum power available to the  
load from the PA-30, and also decisively affects how  
the load is connected to the amplifier. This section  
explains the BTL mode, and describes how to use it.  
The voltage across the load is thus effectively doubled  
– which doubles the power.  
Notice there is a crucial difference between BTL mode  
and what is normally termed 'mono' in the HiFi world.  
When we select 'mono' on a HiFi preamp or integrated  
amplifier, what we intend - and what we get - is the  
same signal from both speakers with the same polarity.  
It is very important to understand the distinction  
between this and BTL mode, because if two speakers  
are connected to the PA-30 in a normal stereo  
configuration and the MODE switch is set to 'BTL', the  
system still works but the two speakers are out of  
phase. This will cause acoustical cancellations at low  
frequencies, resulting in poor sound quality. In rare  
cases, it can even cause a woofer to blow out!  
Theory of Operation  
BTL mode (also called 'bridged' mode) uses both  
channels of the PA-30 to form a single monophonic  
amplifier with significantly higher power capability. If  
your loudspeakers can handle the increased power,  
BTL mode will give you more headroom - resulting in  
undistorted reproduction of program peaks and  
significantly greater 'punch' from your system.  
When the MODE switch is in the 'BTL (MONO)'  
position, only the Channel A input is active; the  
Channel B input is disabled, and signals present at  
either of the Channel B input connectors are ignored by  
the amplifier. The signal at the Channel A input is  
amplified and sent to both outputs of the PA-30, but the  
polarly of Channel B is reversed with respect to  
Channel A. In other words, the two channels are  
intentionally out of phase.  
The single load (remember, BTL is a monophonic, or  
single-channel, mode) is wired across the two channel  
output 'hot' (red) terminals, and the black output  
terminals are left unconnected. The minimum  
allowable load impedance is 8 ohms (not 4 ohms, as is  
the case in stereo mode), and the available power to the  
load is 50 watts continuous (at 8 ohms).  
BTL mode is electrically identical to push-pull  
transmission at line level (the signal level is simply  
much higher): the two channel outputs deliver the same  
absolute signal voltage, but with opposite polarities.  
So, when the Channel A output is at +10 volts, for  
example, the Channel B output is at –10 volts. The  
difference between the two (which is the total voltage  
across the load) is then 20 volts.  
Connections  
Before changing the position of the MODE switch or  
making any input and output connections, turn OFF the  
PA-30. To select BTL operation, move the MODE  
switch to the 'BTL (MONO)' position.  
Figure 9 illustrates the connections for BTL mode. The  
input signal is connected to the Channel A input, using  
either the –10 dBV (RCA) or the +4 dBm (XLR)  
connector. The Channel B input is left unconnected.  
The load is connected across the two output 'hot' (red)  
terminals, and the black terminals are left unconnected.  
Be sure to observe correct output polarity: Channel A is  
positive, and Channel B is negative. Note that the  
minimum permissible load impedanoe in BTL mode is  
8 ohms.  
Connecting loads with a lower impedance will result in  
current limiting, and may trigger the Protection circuits  
to shut down the amplifier.  
NO CONNECTION TO BLACK TERMINALS  
Figure 9. BTL Mode Connection  
TASCAM PA-30 9  
 
Specifications  
Output power at 8 ohms, (1 kHz):  
30 Watts minimum RMS per channel in stereo  
mode, both channels driven. (0.05% THD)  
60 Watts minimum RMS in BTL (monophonic)  
mode. (0.08% THD)  
Protection Circuits:  
DC balance voltage protector; electronic output  
power overload protector  
Semiconductor Complement:  
9 transistors, 8 diodes, 2 integrated circuits,  
3 LEDs.  
Total Harmonic Distortion (1 kHz):  
0.05% (30 Watts 8 ohms, STEREO)  
0.08% (60 Watts 8 ohm, BTL)  
Power Requimments:  
120/230 volts, 50/60 Hz, AC switchable;  
Intermodulation Distortion:  
8 Watts at idle, 130 Watts at rated output.  
Less than 0.2%, 70Hz: 7kHz (4:1)  
Weight:  
Frequency Response:  
4.5 kg net; 5.5 kg in shipping carton.  
20 Hz to 20 kHz, +0, 1 dB at rated power output.  
Physical Dimensions:  
Damping Factor:  
2.1" (54 mm) high, 19" (482 mm) wide, 10.9" (276  
80 minimum, 8 ohm load. 20 Hz to 20 kHz.  
mm) deep.  
Input Impedance and SensItivity:  
–10dBV (0.3 volt RMS) for rated output, 15 kohm  
unbalanced at RCA input.  
NOTES:  
Specifications subject to change without notice.  
0 dBV is referenced to 1 volt RMS.  
0 dBu is referenced to 0.775 volt RMS.  
+1.3 dBu (0.9 volts 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.  
10 TASCAM PA-30  
 
MEMO  
TASCAM PA-30 11  
 
»
PA-30  
TEAC CORPORATION  
Phone: (0422) 52-5082  
3-7-3, Nakacho, Musashino-shi, Tokyo 180-8550, Japan  
TEAC AMERICA, INC.  
Phone: (323) 726-0303  
7733 Telegraph Road, Montebello, California 90640  
5939 Wallace Street, Mississauga, Ontario L4Z 1Z8, Canada  
Campesinos 184, Col. Granjes Esmeralda. CP 09810, Mexico DF  
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Oeverkruid 15, NL-4941 VV Raamsdonksveer, Netherlands  
106 Bay Street, Port Melbourne, Victoria 3207, Australia  
Via C. Cantù 11, 20092 Cinisello Balsamo, Milano, Italy  
Printed in China MA-0761  
TEAC CANADA LTD.  
Phone: 905-890-8008 Facsimile: 905-890-9888  
TEAC MEXICO, S.A. De C.V  
Phone: 5-851-5500  
TEAC UK LIMITED  
Phone: 01923-819699  
TEAC DEUTSCHLAND GmbH  
Phone: 0611-71580  
TEAC FRANCE S. A.  
Phone: 01.42.37.01.02  
TEAC BELGIUM NV/SA  
Phone: 0031-162-510210  
TEAC NEDERLAND BV  
Phone: 0162-510210  
TEAC AUSTRALIA PTY.,LTD. A.B.N. 80 005 408 462  
Phone: (03) 9644-2442  
TEAC ITALIANA S.p.A.  
Phone: 02-66010500  
 

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