Nady Systems Musical Instrument PRM 400 User Manual

O W N E R ’ S M A N U A L  
PRM-400  
6 Channel Powered Mixer  
with Internal DSP Effects  
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WARNING  
An equilateral triangle enclosing a lightening flash/arrowhead symbol is  
intended to alert the user to the presence of uninsulated dangerous  
voltagewithin the products enclosure which may be of sufficient  
magnitude to constitute a risk of electric shock.  
ATTENTION: RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR  
An equilateral triangle enclosing an exclamation point is intended to alert  
the user to the presence of important operating and service instructions in  
the literature enclosed with this unit.  
IMPORTANT SAFETY INSTRUCTIONS  
When using this electronic device, basic precautions should always be taken, including the following:  
1. Read all instructions before using the product.  
2. Do not use this product near water (e.g., near a bathtub, washbowl, kitchen sink, in a wet basement, or near a  
swimming pool, etc.).  
3. This product should be used only with a cart or stand that will keep it level and stable and prevent wobbling.  
4. This product, in combination with headphones or speakers, may be capable of producing sound levels that  
could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or at a  
level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult an  
audiologist.  
5. The product should be positioned so that proper ventilation is maintained.  
6. The product should be located away from heat sources such as radiators, heat vents, or other devices  
(including amplifiers) that produce heat.  
7. The product should be connected to a power supply only of the type described in the operating instructions or  
as marked on the product. Replace the fuse only with one of the specified type, size, and correct rating.  
8. The power supply cord should: (1) be undamaged, (2) never share an outlet or extension cord with other  
devices so that the outlet’s or extension cord’s power rating is exceeded, and (3) never be left plugged into  
the outlet when not being used for a long period of time.  
9. Care should be taken so that objects do not fall into, and liquids are not spilled through, the enclosure’s  
openings.  
10. The product should be serviced by qualified service personnel if:  
A.  
B.  
The power supply cord or the plug has been damaged.  
Objects have fallen into, or liquid has been spilled onto the product.  
C. The product has been exposed to rain.  
D. The product does not appear to operate normally or exhibits a marked change in performance.  
E.  
The product has been dropped, or the enclosure damaged.  
11. Do not attempt to service the product beyond what is described in the user maintenance instructions. All  
other servicing should be referred to qualified service personnel.  
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FEATURES  
The PRM-400 is compact desk console or rackmountable 200W/channel stereo powered mixer with 16 built-in selec-  
table preset DSP echo and reverb effects and a comprehensive mixer section with extensive routing capability. The  
PRM-400 is a versatile audio tool that combines exceptional flexibility and performance, and is ideal for many small  
venue/live sound reinforcement applications.  
Superior audio performance with low noise and powerful,  
full-spectrum transparent audio and natural sounding selec-  
table echo/reverb effects  
High quality sealed pots with center detents (EQ, EFF,  
PAN)  
Tape In and Record Out RCA jacks with Tape level control  
6 mono balanced XLR mic and balanced 1/4line inputs,  
trim controls and switchable 20dB pads, 3-band EQs, Peak  
overload LEDs, Aux, Effects and Pan controls  
Built-in DSP (Digital Sound Processor) for ECHO  
(REVERB) with 16 selectable preset level and echo inter-  
vals and separate Repeat control, Effects Return and both  
individual channel and master mix Effects Send controls,  
master Effects fader, separate effects PFL monitoring, and  
numeric LED display  
Aux/Monitor switch allows the PRM-400 to be used as  
either a stereo main (FOH) or a mono main and monitors  
powered mixer  
Stereo power amplifier delivers 200W/side @ 4 Ohms. Fan-  
cooled, bipolar amplifier design for longest life and maxi-  
mum reliability.  
Headphone output with separate volume adjust  
PFL control for each channel allows headphone monitoring  
independent of channel volume  
Dual 7-band master graphic EQ (with bypass switch) can  
be used in stereo or mono for main and monitor EQ  
Switchable global 48V phantom power  
Dual 10-segment LED meter for L/R main and PFL  
Erasable area above all faders for notations  
Internal AC supply with 115/230V select switch  
Road-tough all steel construction. Rack ears supplied.  
Aux Send and Aux Return with Aux Send and Aux Return  
controls  
Six 1/4TRS inserts allow independent connection of  
effects devices for each mono channel  
Dimensions & Weight: 16x 17x 6(406 x 432 x 152  
mm), 27.8 lbs (12.6 Kg)  
Stereo Master inserts with Pre EQ and Post EQ 1/4TRS  
jacks  
60 mm faders on all channels and master L/R and Effect  
bus mix for precise level control  
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INSTALLATION  
To ensure years of enjoyment from your NADY AUDIO PRM-400 powered mixer console, please read this manual thoroughly  
before using the unit.  
1. INSPECTION  
Your NADY AUDIO PRM-400 was carefully packed at the factory in packaging designed to protect the units in shipment.  
Before installing and using your unit, carefully examine the packaging and all contents for any signs of physical damage that  
may have occurred in transit.  
[Please note: Nady Systems is not responsible for shipping damage. If your unit is damaged, do not return to Nady, but  
notify your dealer and the shipping company (if shipped to you) immediately to make a claim. Such claims must be made by  
the consignee in a timely manner.]  
2. RACK MOUNTING  
Enclosed in the shipping box you will find a rackmount kit. If you want to make your PRM-400 a rack mixer, remove the  
screws from the side panels and use them to attach the rack ears.  
(Note: The rack ears are supplied as “left” and “right” and must be attached as such.)  
3. SETUP AND OPERATION  
Parts of the unit can become very warm during use. This is normal during operation. Care should be taken to ensure that  
there is enough space around the unit for cooling (at least 12or 30cm). Do not place the PRM-400 on high temperature  
devices such as power amplifiers, etc., or the unit may overheat in operation. Also, do not place the unit on speakers as this  
may cause them to move and/or fall due to speaker vibrations.  
Although the units chassis is shielded against radio frequency (RF) and electromagnetic interference (EMI), extremely high  
fields of RF and EMI should be avoided.  
The PRM-400 has an internal power supply and is designed to operate from an external AC source. Power requirements  
for electrical equipment differ from area to area. Be sure to confirm that the voltage selected by the voltage selector switch  
on the back panel is proper for your area (120VAC/60 Hz or 230VAC/50Hz) per the information below:  
Europe (except UK): 230V, 50Hz  
UK and Australia: 240V, 50Hz  
USA and Canada: 120V, 60 Hz  
For other areas, please check with local authorities.  
When ready to operate, plug the AC cord into the power source. Make sure that the unit is turned off before connecting to  
the AC power source to avoid possible loud transients which can damage your speakers or your ears, especially when mon-  
itoring with headphones. Set the noted controls to the positions indicated below to further minimize the chance of undesired  
noise when first powering up your PRM-400 :  
LEVEL FADERS (11,27A,27B,28) ................................................................................................................SET TO MINIMUM  
HI, MID & LOW EQ’S (6) AND PAN CONTROLS (9)..................................TURNED TO THE CENTER DETENT POSITION  
AUX , EFF CONTROLS & PHONES LEVEL CONTROLS (7,8,36) ..........TURNED COMPLETELY COUNTERCLOCKWISE  
ALL OTHER CONTROLS SHOULD ALSO BE TURNED COMPLETELY COUNTERCLOCKWISE.  
Power up the unit as noted in Power Connections, Indicators, and Switches (Section 3e in CONTROLS AND  
CONNECTIONS).  
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CONTROLS AND CONNECTIONS  
1. CHANNEL INPUT SECTION  
which are usually added to the dry signal, dynamic process-  
(1) MIC INPUT  
ing is normally applied across an entire signal. Here an Aux  
Send would be inappropriate. Instead, the signal is intercept-  
ed somewhere along the channel, fed through the dynamics  
processor and/or EQ, then returned to the console at the  
same point where it left. The insert point is normalized, i.e.,  
the signal is only interrupted when a plug is plugged into it.  
The insert jack is located post EQ in the channel and is con-  
figured as: Tip = send, Ring = return, Sleeve = ground. The  
Insert can also be used as a channel direct output by sending  
the signal from the ring. To use the Insert as a direct output,  
insert a 1/4phone plug halfway into the Insert jack so the tip  
of the plug connects with the ring of the insert jack. The jack  
will click into place when the connection to the ring is made.  
The Mic input is an elec-  
tronically balanced XLR  
type designed to accept  
signals from any bal-  
anced low impedance  
(Low Z) microphone. To  
accommodate condenser  
microphones, this input is  
also equipped with  
+48VDC phantom power  
globally switchable to all  
XLR input jacks with the  
Phantom Power switch  
(23) on the master  
(1)  
(2)  
(3)  
(4) TRIM  
Section of the front panel.  
Dynamic or ribbon-type  
microphones do not  
require phantom power-  
ing. It will be necessary to  
The trim control adjusts the input sensitivity (channel gain) of  
the Mic and Line inputs on the input channels. This control  
can be adjusted to accommodate input signals from a wide  
variety of sources, from the high outputs from keyboards or  
drum machines to the small signal outputs of microphones.  
The trim control adjusts the input sensitivity from -20dB to  
-60dB with the -20dB Pad  
adjust the channel gain with the input Trim control (4) and/or  
Pad switch (5) to achieve a nominal operating level. The  
XLR jack is configured for: Pin1 = ground, Pin2 = positive (+),  
Pin3 = negative (-).  
switch (5) in the OUT  
position, and -40dB to 0dB  
(4A)  
with the pad in the IN (but-  
ton depressed) position.  
The best balance of S/N  
[Note: The Mic inputs are more sensitive than the Line inputs.  
Also, do not connect mics with the phantom power switched  
on, as indicated by the Phantom Power On LED (24) in the  
Master Section of the front panel. Never use unbalanced mic  
cables with the Phantom Power switched on. Never short the  
+48VDC to ground, as that can cause serious damage to  
your mixer. Also, turn down the Stereo Master faders (27A,  
27B) to prevent possible sharp transient noise from damaging  
the speakers when turning the phantom power on or off.]  
(4)  
and dynamic range will be  
achieved if you adjust the  
TRIM control on each  
channel separately so that  
the Peak Indicator LED  
(4A) for that channel lights  
(5)  
occasionally.  
(2) LINE INPUT  
(4A) PEAK LED INDICA-  
TOR  
The Line input is designed to accept balanced or unbalanced  
line-level signals such as those from keyboards, drum  
machines, or samplers. There is enough gain available on the  
line input to accept even lower level signals, such as those  
from an unbalanced microphone or guitar output. Use the  
Trim control (4) and/or Pad switch (5) to adjust for the  
desired level. If a balanced signal is to be connected to the  
line input, then a 1/4TRS (stereo) phone plug should be  
wired for: Tip = positive (+), Ring = negative (-), Sleeve =  
ground.  
The Peak LED illuminates  
when a channel is going  
into overload. It detects  
the peak level after the EQ  
and will light at approxi-  
(6)  
mately 5dB before clipping  
to warn that the signal is  
approaching overload. You  
do not want the Peak LED  
to light except very inter-  
mittently during a take or a  
mix. If it does light persist-  
ently, reduce input gain  
with the TRIM control (4)  
or PAD (5).  
(Note: Only the Mic or the Line input of a given channel can  
be connected at one time. Never connect both simultaneously  
to the same channel.)  
(3) INSERT  
All 6 channels are equipped with insert jacks to connect  
external signal processors such as compressors, noise reduc-  
tion systems, or effects devices to the individual input chan-  
nels. Insert points are useful for adding dynamic processing  
or equalization to a channel or the mix. Unlike reverbs, etc.,  
6
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CONTROLS AND CONNECTIONS  
(5) PAD  
The key to successful equalization is to avoid excess. Too  
much equalization on the input channels will result in a mix  
that is smeared together with nothing specifically defined.  
During rehearsals, experiment with the equalizer controls on  
various instruments, vocals and combinations of these mixed  
together to become familiar with various equalizer settings.  
This control attenuates the  
input signal -20dB when  
set to the IN (button  
depressed) position.  
(7)  
(8)  
(6) EQUALIZER CON-  
TROLS  
(7) AUX (POST) SEND CONTROLS  
All input channels are fit-  
ted with a three-band EQ.  
All three bands have up to  
15 dB of cut and boost,  
with a center detent for  
off. The frequency  
response is flat when all  
three EQ knobs are in the  
center detent position. The  
upper and lower shelving  
controls have their fre-  
quencies fixed at 12 kHz  
and 80 Hz respectively.  
The midrange control has  
a peaking response at  
2.5KHz (Q fixed at 1  
The Aux send controls are mono and post-EQ and pre-fader  
and the signal level sent to the AUX bus will be unaffected by  
the channel fader setting. This configuration is ideal for  
almost all monitoring purposes, for example, for a separate  
stage monitor mix in live performances or a studio room mon-  
itor in recording applications, such as for a headphone cue  
system.  
(9)  
(8) EFF (EFFECTS) CONTROLS  
The EFF control are mono, post-EQ and pre-fader and the  
signal level sent to the EFFECTS bus will be unaffected by  
the channel fader setting. These controls adjust the level sent  
by each channel to the internal DSP (Digital Sound  
Processor). (See also Digtal Echo Effects Function and  
Operation)  
(10)  
octave). The channel EQ  
is a valuable feature of the  
mixer as it allows the user  
to control the tonal charac-  
teristics of each instrument  
separately. For example,  
boosting the LOW can fat-  
ten the sound and add  
punch to the bass or  
drums; the MID control  
can be used to define the  
midrange or bring out the  
vocals; and adjusting the  
HIGH control can provide  
a crisp sounding high end.  
Another very important,  
yet often overlooked tech-  
nique is to use the EQ to  
subtract from the mix.  
(9) PAN  
The Channel Pan positions the output of the channel in the  
stereo field of the main mix. Its constant-power design  
ensures there are no level discrepancies whether a signal is  
hard-panned, center-stage, or somewhere in between.  
(10) PFL SELECT SWITCH  
The PFL (pre-fader listen) switch enables monitoring the sig-  
nal of any channel(s) selected (button depressed) at nominal  
levels through the headphone output. The signal is post EQ  
and independent of channel fader position. Selecting the PFL  
never interrupts the main stereo out or the AUX sends.  
(11)  
(11) CHANNEL FADER  
The channel faders determine the output signal level to the  
Master Mix Left, Right busses. They offer a smooth logarith-  
mic taper for optimum control of the signal, more often asso-  
ciated with much more expensive consoles.  
Cutting the HIGH control  
can reduce unwanted hiss  
during multi-track record-  
ing, while attenuating the  
MID or LOW can eliminate  
feedback in a live perform-  
ance or clear up a muddy sounding mix. Cutting away the top  
and bottom, then pushing up the Gain is equivalent to mid  
range boost!  
[Note: Always reset a channel’s input Gain (or external  
device’s output level) after altering the amount of mixer equal-  
ization cut or boost applied.]  
7
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CONTROLS AND CONNECTIONS  
2. MASTER SECTION  
(17)  
(13)  
(16)  
(12)  
(14)  
(15)  
(18)  
(22) 7 BAND MASTER MIX GRAPHIC EQUALIZER  
(25) EQ BYPASS SWITCH  
(26) AUX/MON SELECT SWITCH  
a. AUX Send/Return Function and Operation  
(13) AUX RETURN  
(31) AUX RETURN CONTROL  
(14) STEREO MASTER INSERTS-PRE EQ  
The Aux Return jack enables a convenient input to the left  
and right Master Mix busses. If you connect a signal to the  
Return jack, the Aux Return will operate in mono and the sig-  
nal will be routed to the Aux Return Control (31) and then  
mixed into the left and right Master Mix bus. The Aux Return  
is multi-functional. It may be used for returning the outputs of  
effect units such as Tape Returns from a multi-track recorder,  
or as extra instrument inputs such as from a MIDI keyboard.  
(15) STEREO MASTER INSERTS-POST EQ  
The final Master Mix is output directly to the Main Speaker  
outputs (42). These L/R outputs provide 200W at 4 ohms for  
powering P.A. speakers rated for this power or more. Channel  
A and B parallel outputs allow multiple speaker setups. You  
can also access this Master Mix by utilizing the send function  
of the Stereo Master Inserts (see below). The Record Out  
(17) jacks output the Master Mix post-Stereo Master faders  
(27A, 27B) and are pre-Master EQ (22) and pre-Stereo  
Master Inserts (14,15). These outputs are RCA jacks, and  
designed primarily for inputs to tape recorders, etc.  
(12) AUX SEND  
(30) MASTER AUX SEND CONTROL  
The Aux Send jack is the unbalanced output for the signals  
from the Aux bus. It is pre-fader. This signal can be sent to  
the input of an effects processor, multi-track recorder, or used  
for any other line-level auxiliary purpose, such as monitor  
feeds. The Aux Send level is adjusted by the channel Aux  
Send controls (7) and the Master Aux Send control (30).  
When the Aux/Mon switch (26) is in the depressed IN posi-  
tion, the Aux send also functions as the mono output of the  
Master Right Channel bus. (See also Master Mix Function  
and Operation below)  
The output level routed to the Speaker outputs and REC out-  
puts is determined ultimately by the setting of the Stereo  
Master faders (27A, 27B). The Master Mix (signal on the  
L/R main busses) is the sum of the signals routed from all the  
channels and also the inputs from the EFFECTS and AUX  
busses and the TAPE Input (16). The level input from the  
Tape In (16) is adjusted with the Tape In Level control (29).  
The level of signal routed to the Stereo Master faders  
(27A,27B) from DAT, tape decks, CD players, etc., input to  
the Tape Input (16) is determined by the setting of the output  
volume control of the audio device being connected and the  
Tape In Level Control (29), so care must be taken in adjust-  
ing these levels so as to achieve proper balance in the final  
mix and to prevent overload distortion. The 10-stage LED  
Output Meter (19) can be used to maintain proper levels in  
the master mix.  
b. Master Mix Function and Operation  
(42) MAIN SPEAKER OUTPUTS  
(16) TAPE INPUTS  
(29) TAPE IN LEVEL CONTROL  
(17) REC OUTPUTS  
(27A,27B) STEREO MASTER MIX FADERS  
(19) LED OUTPUT METER DISPLAY  
8
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CONTROLS AND CONNECTIONS  
The PRM-400 is equipped with a 7-  
(20)  
(21)  
band Stereo Graphic Equalizer  
(22), allowing final tonal adjustments  
on the Master Mix. This master EQ  
is post-Stereo Master faders  
(27A,27B) so you must exercise  
care in the proper use of these EQs  
for best overall sound [see also  
INPUT SECTION, (6) EQ above].  
The EQ Bypass switch (25) can be  
used to add or eliminate the Stereo  
EQ from the Master Mix (button  
depressed=EQ bypassed).  
(19)  
(19A)  
(24)  
Further processing of the Master  
Mix can be done by utilizing the  
stereo Master Inserts (14,15). The  
PRE EQ insert (14) inserts a signal  
from an outboard processor, as  
desired, between the Stereo Master  
faders (27A,27B) and the Stereo  
Graphic Equalizer (22), while the  
POST EQ insert(15) inserts it POST  
EQ and before the PRM-400 internal  
power amp. The insert points are  
normalized, i.e., the signal is only  
interrupted when a jack is plugged  
into it. The insert jacks are config-  
ured as: Tip = send, Ring = return,  
Sleeve = ground.  
(23)  
(25)  
(26)  
(22)  
The Inserts can also be used as  
Master Mix pre or post-EQ direct  
outputs by sending the signal from  
the ring. To use an insert as a direct  
output, insert a 1/4phone plug  
halfway into the insert jack so the tip  
of the plug connects with the ring of  
the insert jack. The jack will click  
into place when the connection to  
the ring is made. Such outputs can  
thus serve as feeds for external  
amplifiers or recording devices, for  
example.  
(27A)  
(27B)  
The Aux/Mon Select switch (26)  
can be used to switch between nor-  
mal stereo L/R to dual mono opera-  
tion, such as for powering separate  
mains and monitor speakers with  
the PRM-400. The UP position is for  
stereo operation as described  
(28)  
above, and the DOWN (depressed)  
position enables dual mono opera-  
tion as follows: The Left speaker  
output is a mono mix of both the  
Left and Right signals as controlled  
9
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CONTROLS AND CONNECTIONS  
by the Channel faders, and the Right speaker output is the  
signal controlled by the Channel AUX controls (7).  
Therefore the Main speakers, for example, can be controlled  
by the individual Channel faders (11) and the Left Master  
fader (27A), and the Monitor speakers by the Channel AUX  
controls (7) and the Right Master fader (27B). In this  
mode, any Master EQ (22) or Effects (8,28,32) selected on  
the EFECTS bus will be output on both the Left and Right  
Speaker outputs. The Left and Right Master inserts (14,15)  
operate individually on either channel as in normal stereo  
operation.  
(29)  
(30)  
(31)  
c. Digital Echo Effects Function and Operation  
(20) EFFECTS DISPLAY  
(21) ECHO EFFECT SELECT BUTTONS  
(32) EFFECT SEND  
(33) EFFECT (ECHO) REPEAT  
(34) EFFECT PAN  
(35) EFFECT PFL  
(28) EFFECT FADER  
The built-in DSP (Digital Sound Processor) offers 16 different  
preset level and echo intervals selectable by the Echo Effect  
Select UP/DOWN buttons (21). Press either button to scroll  
in either direction through the 16 presets. The numeric  
Effects Display (20) will indicate which of the 16 effect pre-  
sets has been selected. The DSP processes the signal on the  
EFFECTS bus, which is the sum of the 6 individual channel  
inputs controlled by the EFF control (8). The EFFECT SEND  
control (32) adjusts the level of the signal on the EFFECTS  
bus fed to the DSP. The EFFECT (ECHO) REPEAT control  
(33) adjusts the number of repeats of the echo effect selected  
with the UP/DOWN buttons (21) and the EFFECTS fader  
(28) controls the signal level sent to the Master Mix busses.  
The output of the DSP is sent proportionately to the Left and  
Right Master Mix busses as adjusted by the EFFECT PAN  
control (34). The EFFECT PFL button (35) can be  
depressed to monitor the pre-EFFECTS fader (28) DSP out-  
put through the Monitor Headphones jack (37).  
(32)  
(33)  
(34)  
(35)  
d. Monitor Function and Operation  
(37) HEADPHONES OUTPUT  
(36) PHONES LEVEL CONTROL  
(18) MONO MONITOR OUTPUT  
The PRM-400 allows you to monitor the Stereo Master Mix or  
any signals selected by the channel PFL (10) or EFFECTS  
PFL (35). The signal level is adjusted with the Phones Level  
control (36) and routed to the Headphones (37) output. The  
Phones Output (37) will feed headphones and is a 1/4TRS  
jack, wired: tip = left signal, ring = right signal, sleeve =  
ground. (Note: Use only headphones with an impedance  
>50or you may experience some distortion.)  
If desired, this output can also be connected instead to an  
amplifier and speakers for control room or stage monitoring.  
The MONO Monitor Out Jack (18) is another useful output  
which can be used to feed a signal to a monitor amp or other  
mixer. The signal on this output is taken from the AUX bus  
(36)  
(37)  
10  
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CONTROLS AND CONNECTIONS  
(38)  
(40)  
(42)  
(39)  
(41)  
BACK PANEL  
The PRM-400 is fused for your (and its own) protection. If a  
fuse blows, disconnect the AC cord, and replace the fuse  
with a 6.0A (5x20mm, 250V) type, available at electronics  
stores or through your dealer. If the fuse blows continuously  
upon replacement, unplug the unit and refer to qualified per-  
sonnel for servicing before further use.  
and is pre the master AUX send control (30). When the  
AUX/MON switch (26) button is depressed, this output  
serves as the monitor output for the Right bus (see also  
Master Mix Function and Operation).  
e. Power Connection, Indicators, and Switches  
(39) AC POWER CORD  
(23) PHANTOM POWER SWITCH  
(38) MAIN POWER SWITCH  
(24) PHANTOM POWER ON LED INDICATOR  
When using condenser mics, +48VDC can be switched glob-  
ally on or off to the XLR mic inputs for all six channels (also  
see INPUT SECTION, MIC INPUTS). When this switch is in  
the ''ON'' position (button depressed), the Phantom Power  
On LED Indicator (24) will light, and +48VDC will be provid-  
ed between pins 2 and 3 of all the Mic input XLR connec-  
tors. If you dont need phantom power, be sure to turn this  
switch to the ''OFF'' position.  
(40) 115/230VAC POWER SELECTOR SWITCH  
(19A) POWER ON LED INDICATORS  
(41) FUSE HOLDER  
Check the power source for the voltage (115VAC or 230VAC)  
in your area and switch the Power Selector switch (40) to  
select the proper voltage. Once you have connected the AC  
power cord (39) to the AC power source, switch on your  
mixer with the Power On switch (38). The Power ON LED  
Indicators (19A) will light up. Allow 1 minute after powering  
up for the system to reach equilibrium before setting input  
gains and other levels. You can leave the PRM-400 on all the  
time. It is conservatively designed, so heat build-up isnt a  
problem even in 24-hour-a-day operation. Theres nothing that  
will burn out or get used up. Alternatively, you can just plug  
every unit in your total system into a Nady Power  
[Note: It is safe to connect balanced dynamic mics or line  
level devices even if this switch is on, but connecting unbal-  
anced devices or devices whose transformers are center-  
grounded will cause hum or malfunctions. Shorting the  
+48VDC can also damage your mixer. Also, turn down the  
Stereo Master faders (27A, 27B) to prevent possible sharp  
transient noise from damaging the speakers when turning  
the phantom power on or off.]  
Conditioner PCL-800/810/815 or a good quality power strip,  
for one-button turn-on.  
11  
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CONNECTIONS  
This NADY AUDIO powered mixer uses 4 different types of audio connectors for the various input/output connections: (1) XLR  
balanced; (2) 1/4” TRS phone jacks for balanced, unbalanced, stereo, or in/out inserts; (3) 1/4” TS unbalanced;  
(4) RCA pin unbalanced  
Figures  
1. Balanced XLR input/output connections  
2. Stereo headphone connection with 1/4" TRS  
plug  
MICROPHONE INPUTS  
GROUP & MIX OUTPUTS  
3. 1/4" mono (TRS) plug used as unbalanced  
input/output  
2
1
1
2
Ground (Screen)  
3
3
4. 1/4" stereo (TRS) plug used as balanced  
input/output  
Cold  
(Out of Phase Signal)  
5. 1/4" TRS plug used as Insert Send/Return  
6. RCA pin plug for unbalanced input/ouput  
Hot  
(In Phase Signal)  
Socket (female)  
Plug (male)  
1.  
HEADPHONES  
UNBALANCED USE OF  
MONO 1/4” PLUGS  
BALANCED USE OF  
STEREO 1/4” PLUGS  
Tip =  
Left signal  
Tip =  
Signal  
Tip =  
hot (+ve)  
Ring =  
Right signal  
Ring =  
cold (-ve)  
Sleeve =  
Ground/Shield  
Sleeve =  
Ground/Shield  
Sleeve =  
Ground/Shield  
Tip  
Ring  
Tip  
Tip  
Ring  
Sleeve  
Sleeve  
Sleeve  
Strain relief  
clamp  
Strain relief  
clamp  
Strain relief  
clamp  
2.  
3.  
4.  
1/4” STEREO PLUG USED AS INSERT SEND/RETURN  
RCA PIN PLUG  
TIP  
SLEEVE  
Ground (Screen)  
Send to External  
Device  
Strain relief clamp  
Sleeve =  
Ground  
(Shield)  
Pin =  
Signal  
Ring  
Sleeve  
Tip  
RING  
Return from External Device  
5.  
6.  
12  
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SPECIFICATIONS  
1. POWER OUTPUTS (R.M.S)  
200 Watts (35W + 35W) /4x 2  
0.1% (T.H.D) @ 1KHz  
9. HEADPHONE OUTPUTS  
40mW x 2  
10. PROTECTION  
TURN ON MUTING .................................................... ~ 1 SEC  
TURN OFF MUTING ..................................................INSTANT  
2. TOTAL HARMONIC DISTORTION  
Main Amp 0.05% @1KHz  
Mic Ch ~ Main Amp 0.1% @1KHz  
11. VU METERS  
10-segment LED x 2  
3. FREQUENCY RESPONSE  
± 3dB, 20Hz ~ 20KHz @ 1W/4(Speaker Output)  
± 3dB, 20Hz ~ 20KHz @ +4dB/10(Mixer Stereo Output)  
12. PHANTOM POWER  
+48VDC, globally selected  
4. INPUT LEVEL SENSITIVITY  
MIC CH ..........................................................................-60dBv  
LINE CH ........................................................................-40dBv 13. POWER REQUIREMENTS  
TAPE IN ........................................................................ -40dBv Voltage Selectable......................115VAC/60Hz, 230VAC/50Hz  
AUX RETURN .............................................................. -20dBv  
EFF SEND .................................................................. -20dBv  
EFF RETURN .............................................................. -20dBv 14. POWER CONSUMPTION  
600W  
5. HUM & NOISE  
-80dB ("A" FILTER)  
15. FUSE  
115VAC Operation ......................................6A, 5x20mm, 250V  
230VAC Operation......................................3A, 5x20mm, 250V  
6. REMAINING NOISE  
-85dB ("A" FILTER)  
16. DIMENSIONS (W x H X D)  
16x 17x 6(406 x 432 x 152 mm)  
7. INPUT CHANNEL EQUALIZATION  
MIC, LINE, & PHONO INPUTS:  
EQ  
17. WEIGHT  
HIGH (Shelving) ......................................10KHz / ±15dB 27.8 lbs (12.6 Kg)  
MID (Bell)................................................2.5KHz / ±15dB  
LOW (Shelving)..........................................60Hz / ±15dB  
8. MASTER MIX EQUALIZATION  
7 band (63Hz, 150Hz, 400Hz, 1KHz, 2.5KHz, 6.4KHz,  
15KHz) +/-12dB  
The specifications above are correct at the time of printing of this manual. For improvement purposes, all specifications for this unit,  
including design and appearance, are subject to change without prior notice.  
13  
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BLOCK DIAGRAM  
14  
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SERVICE FOR YOUR NADY AUDIO PRODUCT  
(U.S.) Should your NADY AUDIO product require service, please contact the Nady Service Department via tele-  
phone at (510) 652-2411, or e-mail at [email protected].  
(International) For service, please contact the NADY AUDIO distributor in your country through the dealer from  
whom you purchased this product.  
DO NOT ATTEMPT TO SERVICE THIS UNIT  
YOURSELF AS IT CAN BE DANGEROUS  
AND WILL ALSO VOID THE WARRANTY.  
NADY SYSTEMS, INC. • 6701 SHELLMOUND STREET, EMERYVILLE, CA 94608  
Tel: 510.652.2411 • Fax: 510.652.5075 • www.nadywireless.com  
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