TP-Link RX-7-248 User Manual

Operating Instruction Manual

TOA MIXING CONSOLE

Model RX-7-164, RX-7-248, RX-7-328

TOA ELECTRIC CO., LTD.

KOBE, JAPAN

Contents

Precautions .................................................. 2

General Description ............................................ 3

Features ....................................................... 4

Specifications & Characteristics

Input & Output

Level

Diagrams & Characteristics

IPM-7

GFM-7 (Group/Foldback Module).......................... 11

GEM-7

PGM-7

PHM-7 (Phones Module)....................................... 14

TBM-7

PSM-7 (Power Supply M odule)................................ 16

Meter

RPS-7

General

(Input

(Group/Echo

(Program

(Talkback

Panel

(Power

Information

Specifications

Module)

(RXM-7-25,

Supply

.......................................

Module)

Unit)

...................................

RXM-7-35,

using

...............................

................................

Diagrams ....................

................................

...................................

RXM-7-43)

..................................

the

mixing

console

................

...............

Function

Connection

Connection Examples

Module

Dimensional Diagrams (RX-7-164, RX-7-248, RX-7-328,

RXM-7-25, RXM-7-35, RXM-7-43, RPS-7).................... 35

Block Diagram............................................... 42

Details

Replacement

............................................

Examples I ......................................

II ..................................... 32

........................................

— 1 —

Precautions

1. Power Supply Unit (RPS-7)

The RPS-7 is separate from the console.

If the power switch on the RPS-7 is turned "on" without a connection between the

RPS-7 and the board using the accessory cable packed in the RPS-7, power is not

supplied to the board. The power switch must be "on" after the connection is made.

2. Power Supply

The RPS-7 is designed to operate on local AC (50/60Hz) mains, ±10%.

3. Fuse Replacement

The front panel of the RPS-7 is provided with a fuse holder for the AC line. Replace

only with the Identical Type and Value Fuse.

4. XLR (Cannon) Connector

The connectors are wired in such a manner that pin 1 is ground (shield), pin 2 is cold

(low, minus), and pin 3 is hot (high, plus).

5. Phantom Power Supply

Each RX-7 incorporates a 48V DC Phantom Power circuit. If phantom power is

required, the phantom power Master Switch on the rear panel of the Power Supply

Module should be "on", and the phantom power switch on the front panel of each

Input Module for which phantom power is required should be "on". When using

phantom power, avoid connecting unbalanced microphones or connecting other equipment for which the output transformer center tap is grounded.

6. Description of components and functions

Various descriptions are used by different manufacturers, depending on each

manufacturer's standards. In our Operating and Instruction Manual, explanation of

components and functions is made according to our usage for terminology.

— 2 —

General Description

TOA's RX-7 is a modular 16, 24 or 32 input channel, 4 group output, 4 to 8 program

output mixing console. It is designed to meet a wide variety of requirements in

professional sound reinforcement and recording applications. It is well designed to withstand the rigors of "on the road" use. Modular construction assures versatility in functions, reliability and serviceability.

There are three "standard" models of RX-7 consoles. The RX-7-164 has 16 input

channels, 4 group outputs and 4 program outputs, and consists of the frame/case, power supply unit, and modules, as follows.

16 IPM-7 (Input Module)

2 GFM-7 (Group/Foldback Module) 2 GEM-7 (Group/Echo Module)

2 PGM-7 (Program Module)

1 PHM-7 (Phones Module)

1 TBM-7 (Talkback Module)

1 PSM-7 (Power Supply Module)

1 RXM-7-25 (RX-7-164 Frame/Case)

1 RPS-7 (Power Supply Unit)

The RX-7-248 has 24 input channels, 4 group outputs and 8 program outputs, and

consists of the following modules, frame/case, and power supply unit.

24 IPM-7 (Input Module)

2 GFM-7 (Group/Foldback Module)

2 GEM-7 (Group/Echo Module)

4 PGM-7 (Program Module)

1 PHM-7 (Phones Module)

1 TBM-7 (Talkback Module)

1 PSM-7 (Power Supply Module)

1 RXM-7-35 (RX-7-248 Frame/Case)

1 RPS-7 (Power Supply Unit)

The RX-7-328 has 32 input channels, 4 group outputs and 8 program outputs, and

consists of the following modules, frame/case and power supply unit.

32 IPM-7 (Input Module)

2 GFM-7 (Group/Foldback Module) 2 GEM-7 (Group/Echo Module)

4 PGM-7 (Program Module)

1 PHM-7 (Phones Module)

1 TBM-7 (Talkback Module)

1 PSM-7 (Power Supply Module)

1 RXM-7-43 (RX-7-348 Frame/Case)

1 RPS-7 (Power Supply Unit)

All modules are usable for all RX-7 series consoles.

— 3 —

Features

INPUT MODULE

1. Phantom Power ON/OFF switch.

2. TRIM gain control offers extremely convenient operation when used in

3. MID-EQ is peaking equalization, and its center frequency can be set by a

4. Two foldback control knobs for the 2 foldback busses. One is Pre-fader and the

5. Two echo control knobs for the 2 echo busses. One is Post-fader and the other is

6. Channel ON/OFF pushbutton provides quick connection or disconnection of the

7. DIRECT OUT delivers a signal taken directly from the input module, bypassing

conjunction with INPUT LEVEL switch.

continuously variable frequency control knob.

other is associated with the PRE-POST selector switch for additional effects.

associated with the PRE-POST selector switch.

incoming signal to the mixing busses. The associated green LED illuminates when the channel is connected to the mixing busses.

the pan pot and group assignment switches. This output is provided for direct

routing to a tape recorder track.

8. ACCESSORY SEND/RECEIVE jacks permit inserting a signal processing device into the signal path, or can be used to re-route the signal in special applications.

9. PEAK indicator LED turns on when the input signal reaches l0dB above nominal,

to warn the operator to adjust the input sensitivity.

GROUP/FOLDBACK and GROUP/ECHO MODULES

1. AUX INPUT (Group/Foldback Module) and ECHO IN (Group/Echo Module) are

both balanced (transformer-isolated), with Low, Mid and High-EQ provided for

both types of inputs.

2. ACCESSORY SEND/RECEIVE jacks are located on the rear of the modules for inserting signal processing devices.

3. Group On/Off pushbutton allows rapid punch-ins and punch-outs for temporary

killing of an output without disturbing the mixed level.

4. Foldback (FB) MASTER and ECHO SEND controls adjust each output's level

individually.

5. Peak indicators turn on the warn the operator when the signal level reaches l0dB

above nominal.

— 4 —

PROGRAM MODULE

1. Group 1, 2, 3 and 4 controls pick up the signal from the four group out busses and assign them to the program output. The program output is therefore suitable for

feeding the signal to the house sound system.

2. Program On/Off pushbutton determines whether the individual program output signal is to be fed to the rest of the sound system or other equipment.

3. Peak indicator for detecting overload condition.

4. Program channel mixed signal can be monitored through headphones by phones

selector switches (L and/or R) prior to feeding the signal to the rest of the sound

system or other equipment.

PHONES MODULE

1. Foldback 1 or 2, Echo 1 or 2, Program L and R, Air Monitor L and R can be monitored through headphones by a cluster of selection switches.

2. Air Monitor L and R inputs are provided with PHANTOM power ON/OFF switch.

3. L and R monitor output jacks are located on the rear for monitor loudspeakers

(power amplifiers).

TALKBACK MODULE

1. Oscillator/Pink noise Generator includes 400Hz, 1kHz and 10kHz sine wave signals and pink noise for signal tracing, tape machine alignment, sound system setup or trouble shooting purposes.

2. These signals can be fed to all mixing busses except the cue buss.

— 5 —

Specifications & Characteristics

GENERAL SPECIFICATIONS RX-7-164, RX-7-248 AND RX-7-328

Frequency Response (Measurement of source impedance 150

ohms)

+0dB, -0.5dB; 50Hz to 20kHz +0dB, -2.0dB; 20Hz to 30 kH z

Total Harmonic Distortion

Less than 0.5% at +4dB* output at 1kHz

Hum and Noise (20Hz to 20kHz, input termination of 150 ohms,

Input Level Switches at -60dB, Input Trim at 0)

-128dB* Equivalent Input Noise

-130dB* Equivalent Input Noise, IHF A weighted

-64dB* (68dB S/N) Group Out, Group and one Input Fader

at nominal level

-64dB* (68dB S/N) Program Out, PGM Master and Group controls at max. level, all Group Faders and one Input Fader

at nominal level

-64dB* (68dB S/N) FB Out or Echo Send, FB Master or Echo Send control and one FB or Echo mix control at nominal level

Maximum Voltage Gain

84dB CH IN to Group Out

84dB CH IN to Program Out

84dB CH IN to FB Out 94dB CH IN to Echo send

20dB AUX IN to Group Out

20dB ECHO IN to Group Out 10dB SUB IN to Group Out

Equalization (CH IN, AUX IN, ECHO IN)

LOW 100Hz Shelving (±15dB maximum)

MID 200Hz to 5kHz, variable Peaking (±15dB maximum)

HIG H 10kHz Shelving (±15dB maximum)

High Pass Filter

12dB/octave roll off switchable for 3dB down at 60Hz or

120Hz

Oscillator/Generator

Switchable sine wave at 400Hz, 1kHz and 10kHz (1.0%

Total Harmonic Distortion at +4dB* output) or pink noise.

Inputs and Outputs

See accompanying tables of Input Characteristics and

Output Characteristics.

Crosstalk

-60dB at 1kHz, input to output

VU Meters (0VU = +4dB* output)

RX-7-164

4 large, illuminated meters; switchable for Group or Program 3 smaller, illuminated meters; switchable for 2 Foldback or 2 Echo and CUE or TB

RX-7-248

4 large, illuminated meters for Group

4 large, illuminated meters, switchable for Program 1—5,

2—6,

3 smaller, illuminated meters; switchable for 2 Foldback or 2 Echo and CUE or TB

RX-7-328

4 large, illuminated meters for Group

4 large, illuminated meters, switchable for Program 1—5,

2—6,

6 smaller, illuminated meters for 2 Foldback, 2 Echo, CUE and TB

Peak Indicators

LED built into each input turns on when the pre-Fader level

reaches 10dB above nominal. LED built into each Group, FB, Echo and Program Out turns on when the output level reaches 10dB above nominal.

Phantom Power

48V DC is applied to balanced input transformers for

powering condenser microphones.

Finish

Black panel, rosewood trim, padded armrest

Dimensions (W× D×H)

RX-7-164

40-3/8" × 32-3/8" × 13-7/8" (1026 × 822 × 353 mm) RX-7-248

55-5/8" × 33-1/4" × 15" (1412 × 843 × 382 mm)

RX-7-328

66-5/8" × 32-3/4" × 15" (1691 × 833 × 382 m m)

Weight

RX-7-164; 78kg (171 pounds) RX-7-248; 109kg (240 pounds) RX-7-328; 138kg (303 pounds)

Power Consumption

RX-7-164; 120VA maximum

RX-7-248; 145VA maximum RX-7-328; 170VA maximum

Accessory

Talkback Microphone

3—7,

and 4—8

— 6 —

*0dB is referenced to 0.775V RMS

Input & Output Specifications

Connection

INPUT

1—16, 1—24,

1—32

AUX IN 1 & 2

ECHO IN

1&2

SUB IN 1-4

AIR

MONITOR

L&R

TALK BACK

ACCESSORY

(RCV)

IN PUT 1—16,

1—24

1—32

GROUP 1—4

RX-7 INPUT CHARACTERISTIC

Level

Switch

-60dBm

-40dBm

-20dBm

**All XLR connectors are floating (balanced) and transformer-isolated.

Actual

Load

Impedance

1.2k ohm s

1.7k ohm s

2.5k ohms

4.5k ohms

20k ohms

*0dB is re ferenced to 0.775V RMS.

TRS phone jacks are unbalanced.

Sensitivity is the level required to produce a nominal output of +4dB (1.23V), or th e specified nominal output

level if other than +4dB.

For Use

With

Nominal

50 to 600

ohms mics or

lines

600 ohm lines

50 to 600

ohms mics

10k ohms

lines

Sensitivity*

-80dB (0.08mV)

-60dB (0.78mV)

-40dB (7.8mV)

-16dB (123mV)

-6dB (390mV)

-70dB (0.25mV)

-80dB (0.08mV)

-16dB (123mV)

-6dB (390mV)

Nominal

B (0.78mV) to -30dB (25mV)

-60d B ( 7.8mV ) t o -10dB (250mV)

-40d B (78mV) to +10dB (2.5V)

-20d

B (1.23V)

+4d

+4dB (1.23V)

-70dB (0.25mV) to -40dB (7.8mV)

-60 dB (0.78mV)

+4dB (1.23V)

Input Level*

MAX. Before Clip

-26dB (39mV) to +4dB (1.23V)

-6dB (390mV) to +24dB (12.3V) +14dB (3.9V) to +24dB (12.3V)

+24dB(12.3V)

+24dB (12.3V)

-36dB (12.3mV) to -6 dB (390mV)

-26dB (39mV)

+24dB (12.3V)

Connector**

XLR-3-31

type

XLR-3-31

type

XLR-3-31

type

XLR-3-31

type

TRS

Phone Jack

RX-7 OUTPUT CHARACTERISTICS

Connection

GROUP OUT 1—4 PROGRAM OUT 1—4 or 1—8

F.B. OUT 1 & 2

ECHO SEND 1 & 2

T.B.

OUT

ACCESSORY (SEND) INPUT 1—16

1—24

GROUP 1—4

CH IN

(DIRECT OUT) PHONES OUT

(L&R)

(HEAD) PHONES

1—32

*0dB is referenced to 0.775V RMS.

**All XLR connectors are floating (balanced) and transformer-isolated.

TRS phone jacks are unbalanced except headphone jacks, wired Tip=Left, Ring=Right, Sleeve=Common

Actual Source Impedance

80 ohms

110 ohms

For Use With Nominal

POWER SUPPLY UNIT (RPS-7) SPECIFICATIONS

AC Line Voltage

AC mains 50Hz or 60Hz

DC Output Voltages

±21.5V (for amplifier circuit) 1.8A

+12V ( for relay and LED's) 2.7A

+48V (for phantom power) 0.17A

+6V (VU meter lamps) 1.6A

Power Consumption

170VA maximum

600 ohm Lines

10k ohm Lines

8 ohms or higher impedance lines

Dimensions (W×D×H)

21-1/8" × 14" × 7" (538 × 355 × 179 mm)

Weight

18kg (40 pounds)

Accessories

Power cord Umbilical cable

— 7 —

Output Level*

Nominal

+4dB (1.23V)

-10dB (2 50mV)

MAX Before Clip

+24dB (12.3V)

+10dB(2.5V)

Connector**

XLR-3-32 type

TRS Phone Jack

TRS Phone Ja ck

TRS Phone Jack

Level Diagrams

Characteristics Diagrams

EQUALIZER CURVES

(Fig.

FILTER CURVES

(Fig.

— 8 —

Input Module (IPM-7)

1. XLR type INPUT connector is balanced, transformer-isolated and accepts low impedance

sources from -60dB to +10dB. Prope r adjustment of both the INPUT LEVEL Switch and

TRIM Knob make it possible to provide the optimum setting for each input.

2. GROUND (GND) LIFT Switch is for Pin 1, which makes it easy to avoid ground loops

that are often caused in connection with other equipment and that may induce hum noise. Sliding the ground lift switch from the NORMAL position to the LIFT position cuts

ground loops and may reduce hum noise. For most applications it should be set to the

NORMAL position.

3. ACCESSORY SEND/RECEIVE (ACCESSORY) jacks are unbalanced with an impedance

of 10k ohms and a nominal level of +4dB. These jacks allow inserting signal processing

devices into the signal path. The regular signal path is interrupted at the RCV jack by

inserting a plug into it.

4. DIRECT OUT jack is unbalanced with an impedance of 10k ohms and a nominal level of

+4dB. The jack delivers the signal prior to the pan pot and bus assign switches.

5. PHANTOM power switch permits the user to supply 48V DC through the input connector

to a condensor microphone. If phantom power is required, the phantom power master

switch on the rear panel of the Power Supply Module must be ON before the phantom

power switch on each Input Module is turned ON.

6. PHASE switch reverses the polarity of the incoming audio signal. At "N" (normal)

position, Pin No. 3 of the XLR connector is hot and Pin No. 2 is low. At the "R" (reverse) position, Pin No. 2 is hot. Slide the phase switch to the appropriate position to match the

polarity of the source. Polarity can often be intentionally reversed to eliminate leakage

from adjacent microphones or to create special acoustic effects.

7. INPUT LEVEL switch has 3 settings, -60dB, -40dB and -20dB at the "0" position of the

TRIM knob. Adjust the input level switch, depending on the output level of microphones

or associated equipment.

8. TRIM knob varies the gain of a head-amplifier and provides a continuously variable

control of gain in the range of 0 to —30dB from the input level switch position. It permits

optimum setting of the input channel gain and provides good S/N ratio when used in

conjunction with the INPUT LEVEL switch. Another use of the trim knob is to allow

every input fader to be in a horizontally straight line with proper adjustment of the trim

knob.

9. EQUALIZER consists of three frequency ranges. The HIGH and LOW shelving type

equalizers provide 15dB of boost and attenuation at 10kHz and l00Hz, respectively. The

MID equalizer employs peaking type equalization which provides 15dB boost and

attenuation. The MID-EQ center frequency can be easily set at any frequency between 200Hz and 5kHz by use of a continuously variable frequency setting knob. The "0"

position of each equalizer provides flat response.

10. EQUALIZER IN/OUT switch puts the input signal either in circuit or out of circuit of the

equalizer. The OUT position provides flat response no matter what the position of the EQ

controls.

11. HIGH PASS filter switch provides flat response when OFF, but can be set to cut the

frequency response either below 60Hz or below 120Hz at a 12dB/octave rate.

12. FOLDBACK knobs provide for two independent foldback mixes. The No. 1 foldback knob mixes the signal pre-fader, but the No. 2 foldback knob is associated with the Pre-Post fader selector switch which permits its mix to be either Pre or Post fader.

(Fig.

— 9 —

13. Echo knobs provide for two independent echo mixes. The No. 1 echo knob mixes the signal post-fader, but the No. 2 echo knob is associated with the Pre-Post fader selector switch.

14. PAN POT adjusts the relative output level (balance) to the four mixing busses. It is

operated in conjunction with the group assign pushbuttons to put the desired level of output signal adjusted by the pan pot onto the mixing busses selected by the group assign

pushbuttons. Any selection of the four group assign pushbuttons applies some level of the

output to the related mixing bus, according to wherever the pan pot is situated. Panning to

the center position provides equal output to any of the four mixing busses selected by the

group assign pushbuttons. The following illustration indicates details on the

combinations available of the group asign switches and the pan pot.

(Fig.

4 )

15. GROUP ASSIGN (GROUP) pushbuttons apply the output to any combination of the four

mixing busses.

16. CHANNEL ON/OFF (CHANNEL) pushbutton connects or disconnects the input signal to the mixing busses. The green LED illuminates when the channel is "on".

17. PEAK level indicator turns on when the post-EQ and pre-fader signal level reaches 10dB

above nominal.

18. FADER travel continuously varies the channel level to the four mixing busses. It affects the channel's Foldback 2 and Echo 2 bus sends when the respective Pre-Post selector switches are set at the "post" position and also affects the echo 1 bus sends. The nominal level is "0" position. The fader travel is calibrated in dB and assures very smooth

operation.

19. CUE pushbutton assigns the post-EQ, pre-fader signal to the cue bus for monitoring with headphones, monitor speakers, and/or the cue VU meter. A separate cue VU meter is provided on the RX-7-328, but the cue and talkback VU meter is combined and is switchable on the RX-7-164 and RX-7-248.

— 10 —

Group/Foldback Module (GFM-7)

1. AUX INPUT connector (XLR type) is balanced, transformer-isolated. The nominal level and impedance are +4dB and 600 ohms respectively.

2. GROUND (GND) LIFT switch is for pin 1, which is used to avoid ground loops that are often caused in connection with other equipment and that may induce hum. Sliding the ground lift switch from the NORMAL position to the LIFT position cuts ground loops and may reduce hum. For most applications it should be set to the NORMAL position.

3. ACCESSORY SEND/RECEIVE jacks are unbalanced and their nominal level and impedance are +4dB and 10k ohms, respectively. They provide the ability to insert signal processing devices into the signal path for special applications. The regular signal path between the group mixing bus and group out is interrupted at the RCV jack by inserting a plug into it.

4. SUB INPUT connector (female XLR type) is balanced, transformer-isolated. Its nominal level and impedance are +4dB and 600 ohms, respectively. This connector is useful for cascade connection with another mixer to expand the input capacity.

5. GROUND (GND) LIFT switch is for pin 1 of the Sub Input connector.

6. FOLDBACK PEAK level indicator LED turns on when the foldback output signal level reaches l0dB above nominal.

7. FOLDBACK MASTER control adjusts the output signal level of FB OUT on the rear of the

frame.

8. EQUALIZER for AUX INPUT consists of the following three equalizers HIGH 10kHz ±15dB boost/cut shelving type MID 200—5kHz variable ±15dB boost/cut peaking type LOW l00Hz ±15dB boost/cut shelving type Flat frequency response is provided at "0" position of each equalizer.

9. EQUALIZER IN/OUT switch permits the equalizer to be either in circuit or out of circuit.

10. GROUP ASSIGN pushbuttons apply the AUX input to any of the four group mixing busses.

11. AUX INPUT master control adjusts the level of the signal to be fed to the group mixing busses.

12. CUE pushbutton assigns the signal (pre AUX INPUT master control) to the cue bus for monitoring with headphones, monitor speakers, and/or the cue VU meter. A separate cue VU meter is provided on the RX-7-328, but the cue and talkback VU meter is combined and is switchable on the RX-7-164 and RX-7-248.

13. GROUP ON/OFF pushbutton connects or disconnects the signal to the GROUP out and

group out bus. The adjacent green LED illuminates when the group out is "on".

14. PEAK level indicator turns on when the group output signal level reaches l0dB above

nominal.

15. GROUP FADER TRAVEL is calibrated in dB and insures very smooth operation. The

fader controls the level of the signal to be fed to the group out and group out bus.

16. CUE pushbutton assigns the pre group-fader signal to the cue bus for monitoring with

headphones, monitor speakers, and/or the cue VU meter. A separate cue VU meter is provided on the RX-7-328, but the cue and talkback VU meter is combined and is switchable on the RX-7-164 and RX-7-248.

(Fig. 5)

— 11 —

Group/Echo Module (GEM-7)

1. ECHO IN connector (XLR type) is balanced, transformer-isolated. The nominal level and

impedance are +4dB and 600 ohms, respectively.

2. GROUND (GND) LIFT Switch is for pin 1, which is used to avoid ground loops that are

often caused in connection with other equipment and that may induce hum. Sliding the

ground lift switch from the NORMAL position to the LIFT position cuts ground loops and

may reduce hum. For most applications it should be set to the NORMAL position.

3. ACCESSORY SEND/RECEIVE jacks are unbalanced and their nominal level and

impedance are +4dB and 10k ohms, respectively. They provide the capability to insert

signal processing devices into the signal path for special applications. The regular signal

path between the group mixing bus and group out is interrupted at the RCV jack by

inserting a plug into it.

4. SUB INPUT connector (female, XLR type) is balanced, transformer-isolated. Its nominal

level and impedance are +4dB and 600 ohms, respectively. This connector is useful for cascade connection with another mixer to expand the input capacity.

5. GROUND (GND) LIFT switch is for pin 1 of the Sub Input connector.

6. ECHO SEND PEAK level indicator turns on when the echo send output signal level

reaches l0dB above nominal.

7. ECHO SEND master control adjusts the output signal level of ECHO SEND output on the

rear of the frame.

8. EQUALIZER for ECHO IN consists of the following three equalizers HIGH 10kHz ±15dB boost/cut shelving type

MID 200—5kHz variable ±15dB boost/cut peaking type

LOW l00Hz ±15dB boost/cut shelving type

Flat frequency response is provided at "0" position of each equalizer.

9. EQUALIZER IN/OUT switch permits the equalizer to be either in circuit or out of circuit.

10. GROUP ASSIGN pushbuttons apply the ECHO input to any of the four mixing busses.

11. ECHO IN master control adjusts the level of the signal to be fed to the group mixing

busses.

12. CUE pushbutton assigns the signal (pre ECHO IN master control) to the cue bus for

monitoring with headphones, monitor speakers, and/or the cue VU meter. A separate cue

VU meter is provided on the RX-7-328, but the cue and talkback VU meter is combined

and is switchable on the RX-7-164 and RX-7-248.

13. GROUP ON/OFF pushbutton connects or disconnects the signal to the GROUP out and

group out bus. The adjacent green LED illuminates when the group out is "on".

14. PEAK level indicator turns on when the group output signal level reaches l0dB above

nominal.

15. GROUP FADER TRAVEL is calibrated in dB and insures very smooth operation. The

fader controls the level of the signal to be fed to the group out and group out bus.

16. CUE pushbutton assigns the pre group-fader signal to the cue bus for monitoring with

headphones, monitor speakers, and/or the cue VU meter. A separate cue VU meter is

provided on the RX-7-328, but the cue and talkback VU meter is combined and is switchable on the RX-7-164 and RX-7-248.

(Fig. 6)

— 12 —

Program Module (PGM-7)

Each program module incorporates two program output channels (programs A and B) and

each program channel can be controlled independently.

1. PROGRAM OUTPUT B connector (XLR type) is balanced, transformer-isolated. The nominal level and impedance are +4dB and 600 ohms, respectively. The program output B signal is derived from one of the four group out busses.

may reduce hum. For most applications it should be set to the NORMAL position.

3. PROGRAM OUTPUT A connector (XLR type) is balanced, transformer-isolated. The

nominal level and impedance are +4dB and 600 ohms, respectively. The program output

A signal is derived from one of the four group out busses.

4. GROUND (GND) LIFT switch is for pin 1, which is used to avoid ground loops that are often caused in connection with other equipment and that may induce hum. Sliding the ground lift switch from the NORMAL position to the LIFT position cuts ground loops and

may reduce hum. For most applications it should be set to the NORMAL position.

PROGRAM OUT "A" SECTION

5. GROUP 1, 2, 3 and 4 controls pick up the signal from the four Group out busses, and

assign them to this program output channel.

6. PROGRAM MASTER control adjusts the overall mixed signal level of any four Group

signals assigned to this channel.

7. PROGRAM ON/OFF pushbutton connects or disconnects the program signal to the

program output connector. The green LED illuminates when the program out is "on".

8. PEAK level indicator turns on when the program output signal level reaches l0dB above

nominal.

9. PHONES selector switches assign the program signal of this channel to the phones

module. The switches allow for the selection of L (left) and/or R (right) of the phones

output. If the program output is required for monitoring via headphones, the program

monitoring button on the phones module must be ON.

PROGRAM OUT "B" SECTION

Functions on program out B section are the same as the Program out A.

10. GROUP 1, 2, 3 and 4 controls

11. PROGRAM MASTER control

12. PROGRAM ON/OFF pushbutton

13. PEAK level indicator

14. PHONES selector switches

(Fig.

— 13 —

+ 30 hidden pages