Digital Voice Research NRGSUB 800 User manual

COMPACT ACTIVE SUBWOOFER
800 W RMS MOSFET POWER AMPLIFIER
ELECTRONIC STEREO CROSSOVER
AUDIO PROCESSOR
ELECTRONIC LIMITER
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USER’S MANUAL
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DESCRIPTION
The NRGSUB 800 is a very compact and innovative subwoofer that can ensure an absolute
sound quality in any use conditions.
It incorporates a powerful and reliable 800 Wrms power amplifier with MOS-FET technology desi-
gned for making a dynamic and clear sound, along with a music quality without equal.
The dynamics of trasducer is maximized by the AUDIO SIGNAL PROCESSOR and the ELEC-
TRONIC LIMITER and it at the same time protected from signal peaks and distorsion wich
could compromise its lenght.
Thanks to the trasducers quality, the high technological content of its incorporated power
amplifier, the
NRGSUB 800 meet the strict demand of PA system as bass frequency reinforce-
ment system.
On the top of the cabinet there is a top hat on which insert a standard stand for acoustic speaker.
USE OF BALANCED INPUTS
NRGSUB 800 inputs are BALANCED 3 poles XLR CANNON type.
Balanced connection is studied to have a better rejection against the noise that wires (if very long)
takes from external interferences.
Most of professional audio equipment have balanced outputs, you can use however non balanced
connection with mono JACK (or 3 poles CANNON with pin 3 connected to pin 1) the NRGSUB
800 will work normally, but it will be more sensitive to external interferences.
LINK outputs are paralleled with inputs, so they are balanced/sbalanced like the inputs.
XOVER outputs are always BALANCED type.
USE OF CROSSOVER AND
LINK / XOVER OUPUTS
Internal crossover can be utilized in STEREO mode; connecting the two inputs L - R and their out-
puts, or in MONO mode; connecting only the R (MONO) input and its relative outputs (see fig.1).
The crossover outputs can be LINK or XOVER types;
• LINK OUTPUT is nothing else that the paralleled input signal, it can be used to give the save signal
to another speaker system.
It can be used to have a reinforcement on bass frequency, the speaker system connected to the
LINK output will reproduce the full range of frequency. If the speaker system does not can handle
bass frequency or you hear dangerous distorsions, is preferred to use XOVER output.
• XOVER OUTPUT allows to exclude from the output signal all bass frequency range (< 125 Hz).
It can be used to have the best sound clearness and an higher sound pressure in the mid/high fre-
quency. The sound system connected to the XOVER ouput will reproduce only the mid/high fre-
quency range (> 125 Hz).
To have an higher sound pressure in bass frequency, is preferred to use LINK output.
USE OF INPUTS LEVEL
Volume knob adjust the input level of the two inputs and control only the subwoofer level,
the
volume of LINK and XOVER outputs are unchanged.
Is preferred to use this control to have the right compromise between the bass frequency genera-
ted from subwoofer and the rest of sound system.
The sound level can vary, it depend of the type of sound systems and connections (balanced/sbalan-
ced - link/xover).
The internal electronic limiter will always protect the loudspeaker and the amplifier from dangerous
input signal levels.
USE OF KEY GND-LIFT:
Switch for the electrical separation between the ground circuit and the earth circuit; in the
“ ” position, the input signal ground is electrically disconnected from the earth circuit, in the
event the speaker develops a buzz, this position provides for opening the “ground rings,” that
are often the cause of such interference. In the “ ” position,
the input signal ground is electrically connected to the device's earth circuit.
USE THE GROUND LIFT FOR BALANCED SIGNALS ONLY.

DESCRIPTION OF REAR PANEL AND CONNECTIONS
1) Power supply 230 Vac 50 Hz
2) Power switch with lamp (0 -1)
3) Protection fuse
4) Balanced line input LEFT
5) Balanced line output LEFT - LINK (without crossover cut)
6) Balanced line output LEFT - XOVER (with crossover cut)
7) Balanced line input RIGHT or MONO
8) Balanced line output RIGHT - LINK (without crossover cut)
9) Balanced line output RIGHT - XOVER (with crossover cut)
10) Input level adjutment (L+R)
10) Key GND-LIFT
0
MAX
INPUT LINK OUT XOVER OUT GND-LIFT
INPUT LINK OUT XOVER OUT SUB LEVEL
RIGHT
mono
LEFT
E
N
E
R
G
Y
XOVER OUT 125 Hz
XOVER SUB 125 Hz
POWER
ON/OFF
AC-IN
230 Vac/50 Hz
Rear panel up Rear panel down
4 5 6
789
10
1
3
2
NOTE: In case of internal amplifier over-
heating, the heat-protection turn off the
system, when the temperature return to
normal level, automatically the protection
turn on again the system.
If the input signal level is higher than +10
dB the electronic limiter lose his effect.
Input level higher than +10 dB can
damage the speaker system.
0
MAX
INPUT LINK OUT XOVER OUT GND-LIFT
INPUT LINK OUT XOVER OUT SUB LEVEL
RIGHT
mono
LEFT
E
N
E
R
G
Y
XOVER OUT 125 Hz
XOVER SUB 125 Hz
NRG 250
NRG 300
NRG 400
STEREO MODE: 1 SUBWOOFER + 2 ACTIVE SPEAKERS
MONO MODE: 1 SUBWOOFER + 1 ACTIVE SPEAKER for CHANNEL
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L
NRG 250
NRG 300
NRG 400
L
R
RL
L
Connect to
RR ((MMOONNOO))
INPUT
Connect like
LLcchhaannnneell
CCoonnnneeccttttooLLIINNKKoorrXXOOVVEERROOUUTTooff RR
((MMOONNOO))cchhaannnneell
CCoonnnneeccttttooLLIINNKKoorrXXOOVVEERROOUUTTooff
RR ((MMOONNOO))cchhaannnneell
MIXER
MIXER
NRG 250
NRG 300
NRG 400
R
NRG 250
NRG 300
NRG 400
R
0
MAX
INPUT LINK OUT XOVER OUT GND-LIFT
INPUT LINK OUT XOVER OUT SUB LEVEL
RIGHT
mono
LEFT
E
N
E
R
G
Y
XOVER OUT 125 Hz
XOVER SUB 125 Hz
0
MAX
INPUT LINK OUT XOVER OUT GND-LIFT
INPUT LINK OUT XOVER OUT SUB LEVEL
RIGHT
mono
LEFT
E
N
E
R
G
Y
XOVER OUT 125 Hz
XOVER SUB 125 Hz
Fig. 1
11

DATI TECNICI CASSA ACUSTICA
TECHNICAL SPECIFICATION AMPLIFIER
TECHNICAL SPECIFICATION STEREO CROSSOVER
PROTECTION
Type Bass-Reflex
Built-in amplifier 800 Wrms
Frequency response 29-125 Hz
Sensitivity (1w/1m) 101 dB
Electronic Crossover 125 Hz - 24db/oct
Low frequency woofer 1 x 18"
Input connectors 2 x XLRM
Output connectors 2 x XLRM Flat/2 x XLRF Xover
Dimension (H x W x D) 530 x 695 x 560 mm
Net weight 38 Kg
Type AB class mosfet with audio signal processor
Output power 800 W R.M.S. / 4 Ohm
THD 0,1 % at 1 Khz
Frequency response 20 - 50.000 Hz
Input sensitivity 0 dB
Input impedance 10 KOhm
Type: Electronic - low noise - stereo
Cut frequency:
125 Hz - 24 dB/oct.
Inputs: Balanced - 2 x XLRF (stereo/mono)
Outputs: Balanced - 2 x XLRF Flat + 2 x XLRF Xover 125 Hz
Electronic limiter on the input signal (max +10 db)
Protection fuse on power supply (1 x 4AF)
Double protection fuse on power amplifier (2 x 8AF)
Self-resetting thermal fuse on transformer and power amplifier
CODEM MUSIC S.r.l. - Via G.Pierini, 13 - 61100 PESARO - ITALY
Tel. [phone] - Fax [phone]
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