Pulse RMX112 User Manual

12 CHANNEL LINE MIXER

Model: RMX112

INFORMATION ON WASTE DISPOSAL FOR CONSUMERS OF ELECTRICAL & ELECTRONIC EQUIPMENT. When this product has reached the end of its life it

must be treated as Waste Electrical & Electronic Equipment (WEEE). Any WEEE marked products must not be mixed with general household waste, but kept separate for the treatment, recovery and recycling of the materials used. Contact your local authority for details of recycling schemes in your area.

12 CHANNEL LINE MIXER

IMPORTANT!

Please read this manual carefully before operating this unit for the first time and retain for future reference.

CONTENTS

TROUBLESHOOTING

Symptom

Likely Cause

No sound

Speaker not connected to active AC power

Verify that the speaker is connected and that the circuit is on.

No sound, speaker is connected to working

AC power but won't

come on

Speaker power cable is faulty or improperly connected.

Blown fuse

*Re-seat the power cable at both ends. *Substitute a known-good power cable.

No sound

Speaker comes on

Signal source (mixer, Amp instrument) is not sending

*Check that the signal LED indicators are lit. *Verify that the tape or CD is playing. *Use headphones to verify that the instrument is actually sending

an audio signal.

*Disconnect and re-seat signal cables. *Replace the suspected cable with a known-good cable.

No sound with

microphone

connected to MIC /

LINE input

Microphone requires phantom power

The EON does not supply phantom power. Switch to a dynamic microphone, use a battery powered microphone (if possible), use an external phantom power supply for condenser type microphones.

Excessive input signal, trying to exceed the capabilities of the speakers

*Reduce the output level of the source. *Turn down the level controls on the speaker. *Use additional EON speakers.

Lots of hiss in sound.

Mixer controls are at

very low settings

Improper gain structure

Hum or Buzz

Improper A/C gr

ounding,

ground

loops

Excessively long unbalanced cable run

Improper system gain structure

*Use the balanced outputs (if available) of your mixer or source

equipments to drive your EON speakers.

*Use the "DI" (direct injection) box to convert unbalanced

equipment output to a balanced output.

Signal

distorted and very loud, LIMIT light is lit most of the time

01 SAFETY RELATED SYMBOLS

02 WARNING

03 IMPORTANT SAFETY INFORMATION

INTRODUCTION

CONTROL ELEMENTS

INSTALLATION & CONNECTION

BLOCK DIAGRAM

TECHNICAL SPECIFICATION

TROUBLESHOOTING

Power not switched on

Switch on the power and verify that the power LED is on.

Reduce the INPUT level controls and increase the output level of your source devices.

Faulty cables & connections

*Make sure that the MIC/LINE switch is in the LINE

(disengaged) position.

*Reduce the level settings on the speaker. Review the manual

for your mixer and adjust the controls as needed.

*Input sensitivity (gain). *Channel faders. *Master faders.

*"Lift" audio ground using XLR/F to XLR/M adaptor on one end. *Re-route audio cables away from AC power and lighting cables.

What to do

*Check fuse and replace with the same type and specification.

SAFETY RELATED SYMBOLS

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

The symbol is used to indicate that some hazardous live terminals are involved within this apparatus, even under the normal operating conditions.

The symbol is used in the service documentation to indicate that specific components shall only be

replaced by the component specified in the documentation, for safety reasons.

Protective grounding terminal.

Alternating current/voltage.

CAUTION: Describes precautions that should be observed to prevent danger of the apparatus.

WARNING

Power Supply

Ensure the source voltage matches the voltage of the power supply before turning the apparatus on.

Hazardous live terminal.

ON: Denotes that the apparatus turns on.

OFF: Denotes that the apparatus turns off, because of using the single pole switch, be sure to unplug the AC power to prevent any electric shock before you proceed with your service.

WARNING: Describes precautions that should be observed to prevent the danger of injury or death to the user.

This product should not be placed in municipal waste and should be

eated as Waste Electrical &

Electronic Equipment (WEEE).

Unplug this apparatus during lightning storms or when unused for long periods of time.

External Connection

The external wiring connected to the output hazardous live terminals requires installation by an instructed person, or the use of ready-made leads or cords.

Do not Remove any Cover

There are some areas with high voltages inside, so to reduce the risk of electric shock, do not remove any cover if the power supply is connected. The cover should be removed by qualified personnel only. There are no user serviceable parts inside.

Fuse

To prevent a fire, be sure to use fuses with a specified standard (current, voltage, type). Do not use a different fuse or short circuit the fuse holder. Before replacing the fuse, turn off the apparatus and disconnect the power source.

Protective Grounding

Be sure to connect the protective grounding in order to prevent an electric shock before

turning on the apparatus. Never cut off the internal or external protective grounding wire or disconnect the wiring of the protective grounding terminal.

Operating Conditions

Do not expose to rain or moisture. Do not immerse the appliance in water or any other liquids.

Impedance

Equalizer

Crosstalk

Main Mix Section

Dielectric Strength

Insulation

Resistance

Power supply

Physical

Microphone Input

All Other Input

All Other Outputs

High

Mid

Low

Adjacent Input

Input to Output

Line output

MIC output, MONO output

Max output

Noise (Bus noise)

Between Live+Negative Earth

Between Live+Negative IN/OUT Terminal (Positive+Negative) Between Live+Negative Earth (A Voltage of 500VDC)

Between Live+Negative IN/OUT Terminal (Positive+Negative) (A Voltage of 500VDC)

Main voltage

Dimension (WxDxH)

Weight

1.4k Ohms

10k Ohms or greater

120 Ohms

±15 dB @ 12 kHz

±12 dB @ 2.5 kHz

±15 dB @ 80 Hz

≤-82dB @ 1KHz (CH level at max, EQ at MID, MAIN level and other at min, SW at line)

≤-70dB @ 1kHz (Ch1-6); ≤-68 dB @ 1KHz (CH7-12)

0 dBu (±2dBu) Balanced (CH level & MAIN & EQ at MID, other at min, SW at line) 0 dBu (±2dBu) Unbalanced, 1/4" Jacks (CH level & MAIN & EQ at MID, other at min, SW at line)

+21 dBu Blanced/Unbalanced, 1/4" Jacks

≤-83dB @ 20Hz~22KHz (channel & MAIN level & EQ at MID, other at min, SW at line) 1500VAC at Test, Frequency 50/60Hz, Leakage Current: 5mA for 1 minute 3000VAC at Test, Frequency 50/60Hz, Leakage Current: 5mA for 1 minute

>2MΩ

>4MΩ

220~240VAC/110~120VAC ~ 50/60Hz or 24VDC

483x195x44mm

Net: 2.9kg

12 CHANNEL LINE MIXER

IMPORTANT SAFETY INFORMATION

Read these instructions.

Follow all instructions.

Keep these instructions.

Heed all warnings.

Only use attachments/accessories specified by

the manufacturer.

Power Cord and Plug

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 a replacement of the obsolete outlet.

Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles and at the point where they exit from the apparatus.

Cleaning

When the apparatus needs cleaning, you can blow off dust from the apparatus with a blower, or by using a clean, dry cloth.

Do not use this appliance in the immediate

surroundings of a bath, a shower or a swimming pool.

Install in accordance with the manufacturer's instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus, including amplifiers, that produce heat. Do not block any ventilation openings.

No naked flame sources, such as lighted candles, should be placed on the apparatus.

Don't use any chemicals, abrasives or solvents such as benzol, alcohol, or other fluids with very strong volatility and flammability for cleaning the apparatus body. Clean only with dry cloth.

Servicing

Refer all servicing to qualified personnel. To reduce the risk of electric shock, do not perform any servicing other than that contained in the operating instructions, unless you are qualified to do so.

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.

The mains plug is used as the disconnect device and shall remain readily operable.

TECHNICAL SPECIFICATIONS

Mono channels (CH1-CH6)

Microphone Input

Frequency Response

Distortion (THD&N)

Sensitivity

Max. Input

Maximum Voltage Gain

SNR( Signal to Noise Rate )

Phantom power(Mic Pin2/Pin3 & Pin1)

Line Input

Frequency Response

Distortion( THD&N)

Sensitivity

Max. Input

Stereo channels(CH7/8-CH11/12)

Line Input

Frequency Response

Distortion (THD&N)

Sensitivity

Max. Input

Maximum Voltage Gain

SNR (Signal to Noise Rate)

Electronically Balanced, Discrete Input Configuration

≤0.03% at 1kHz

-40dBu

-19dBu

60dB CH MIC INPUT MAIN OUT (XLR,balanced)

50dB CH MIC INPUT REC OUT (Unbalanced)

60dB CH MIC INPUT MIC OUT (Unbalanced)

60dB CH MIC INPUT MONO OUT (Unbalanced)

≥103dB

Electronically Balanced

20Hz to 22kHz, +/-2dBu

≤0.03% at 1kHz

0 dBu

+21 dBu

20dB CH MIC INPUT MAIN OUT (XLR,balanced)

10dB CH MIC INPUT REC OUT (Unbalanced)

20dB CH MIC INPUT MIC OUT (Unbalanced)

20dB CH MIC INPUT MONO OUT (Unbalanced)

Electronically balanced

≤0.03% at 1kHz

+10dBu

+21dBu

10dB CH MIC INPUT MAIN OUT(XLR,balanced)

0dB CH MIC INPUT REC OUT(Unbalanced)

4dB CH MIC INPUT MONO OUT(Unbalanced)

≥103dB

Input

Channels

12 CHANNEL LINE MIXER

20Hz

to 22kHz, +/-2dBu

+18V~+21V with switch control

Maximum Voltage Gain

20Hz to 22kHz, +/-2dBu

BLOCK DIAGRAM

INTRODUCTION

12 CHANNEL LINE MIXER

The RMX112 is a professional compact mixer preamplifier. The RMX112 offers a smooth, accurate, natural and open sound from this apparatus, ideal for gigs, recording and fixed PA installations.

The RMX112 12 Channel Line Mixer is easy to operate, but we advise you to go through each section of this manual carefully in order to get the best out of the RMX112.

FEATURES

The RMX112 mixer preamplifier is designed for professional application with the following features:

• MONO channels

• 6 combo inputs

• MIC, MIC with phantom power, LINE switch selector

• Low-distortion MIC pre-amp with high dynamic range, balanced XLR and TRS input jacks

• Phantom power on each MIC input channel

• CH level control, signal LED to indicate input signal

• MIC I priority mute potentiometer

• Stereo channels

• CH 7/8, CH 9/10, CH 11/12 RCA inputs

• Input level control, input signal LED

• Stereo line output, balanced XLR for mixing left/right output

• MONO output and level control

• MIC out for monitoring CH1-CH6 output and MIC/LINE SWITCH control, level to change output

signal

• STEREO REC OUT, RCA for mixing L/R out

• 3-band EQ for low, mid, high

• Master level controls the main output level, output signal LED

• 4-segment signal level metres, using mater level to control LINE OUTPUT signal

• Switchable AC220-240V or DC24V operating voltage

GETTING STARTED

• Check the AC voltage available in your country before connecting your RMX112 to the AC socket.

• Be sure that the main power switch is turned off before connecting to the AC socket.

• You should also make sure that all input and output controls are turned down in order to avoid

damage to your speaker and avoid excessive noise.

• Before turning on the RMX112 you should connect it to a power amplifier and turn on the mixer BEFORE the power amplifier. Once you have finished your working session, turn the mixer off AFTER the power amplifier.

• Before disconnecting the RMX112, always turn off the power switch.

RMX112

CONTROL ELEMENTS

1. MIC INPUT VOLUME KNOBS

MIC channel 1 has priority over other MIC input channels. This function can be disabled by adjusting the MIC priority knob at the back of the unit. Adjustment of high gain may distort the original signal, but if it's too low, it may cause insufficient signal. Trim each channel individually by fixing the main output to a certain level while turning off other channels. Repeat this step and mark the level at each knob to avoid constant sound setup. The rotary knobs for microphone inputs 1 to 6, 7/8, 9/10,11/12 are for adjustment of input signal levels. In setup, adjust this gain to the optimum level according to the required output level. Different channels may have different input sources (i.e. condenser or dynamic MIC, etc).

2. SIGNAL LED

The presence of the input signal is indicated at this LED. The strength of input signal shall determine the brightness of the LED indicators.

3. MIC/LINE SWITCHABLE BUTTON & MIC CONTROL KNOB

The "MIC/LINE SWITCHABLE" button is used for selecting the MIC out or LINE out. When the button is pressed, only CH1-CH6 have output from MIC out. The MIC volume knob is activated (at present MIC 1 has no priority). The volume can be adjusted by rotating the knob to increase/decrease the MIC output level. But LINE out has no output (this function is used for monitoring the MIC out from CH1-CH6). When the button is released, all out have signal output except MIC out.

4. EQUALIZER

The RMX112 is equipped with 3-band mid sweep EQ: LOW, MID & HIGH.

- LOW

This is the bass control. It is used to boost male voice, kick-drum or bass guitar. Your system will sound much bigger than what it is. The gain range goes from -15dB to +15dB with a centre frequency of 80Hz.

Sleeve=Ground/Screen

Tip=Signal

Sleeve=Ground/Screen

Ring=Return Signal (Connected together)

To Channel Insert

To Tape or FX Input

'Tapped' Connection Direct Output Lead

(Enables the Insert to be used as a Direct

Output while maintaining the channel signal flow)

Sleeve

Sleeve=Ground/Screen

Ring=Return Signal

Tip=Send Signal

To Channel Insert

To Processor Input

To Processor Output

Ring

Tip

Y-Stereo lead for insert connection

(To be used when the processor does not employ a single jack connection for the In/Out connections)

FRONT PANEL

12 CHANNEL LINE MIXER

5.MONO

The level control knob sets the level of mono output signal, ranging from - to +10 dBu.

6.L/R LED METER

The LED meter indicates the level of input signal. A clipping indicator is also supplied.

7.MASTER

This knob is used for adjusting the LINE output level. To avoid over amplification, it's recommended that this level is set properly. It is advisable that the gain be set to minimum when powering the system as well as shut down as this can eliminate a sudden signal burst to your system.

8.POWER SWITCH & LED INDICATOR

This switch controls the power for the unit. When the unit is switched on, the LED will light up. The unit is also provided with a 24V DC backup power supply.

9.MOUNTING EAR

The mounting ear is adopted to easily install the unit on the rack.

This connector is meant for the connection of the supplied power cord. Please check the voltage accepted by the unit and the voltage available from AC sockets before connecting the unit to the Mains.

ome Final Tips on Wiring Configuration

ou can connect unbalanced equipment to balanced inputs and outputs. Simply follow these schematics.

Strain Clamp

Sleeve

Tip

Ring

Sleeve=Ground/Screen

Ring=Right Signal

Tip=Left Signal

Use for Headphone

1/4" Stereo (TRS) Jack Plug

Strain Clamp

Sleeve

Tip

Sleeve=Ground/Screen

Tip=Signal

Use for Mono Line In, Mono 1/4"Jack Plugs

1/4" Mono (TS

) Jack Plug

Strain Clamp

Sleeve

Tip

Ring

Sleeve=Ground/Screen

Ring=Return Signal

Tip=Send Signal

Use for Inserts Points

1/4" Stereo (TRS) Jack Plug

2=Hot(+)

3=Cold(-)

1=Ground/Screen

Use for Balanced Mic Inputs

(For unbalanced use, connect pin 1 to 3)

3-pin XLR Male Plug

(seen from

soldering side)

2=Hot(+)

3=Cold(-)

1=Ground/Screen

Use for Main output

(For unbalanced use, leave pin 3 unconnected)

3-pin XLR Line Socket

(seen f

rom soldering side)

PHPH PH PH PH PH

12 CHANNEL LINE MIXER

-MID

This is the midrange control. It provides -12dB to +12dB boost or cut with a centre frequency of

2.5kHz. It can affect most fundamental frequencies of all musical instruments and human voice.

-HIGH

This is the treble control. You can use it to get rid of high frequency from a human voice. The gain range goes from -15dB to +15dB with a centre frequency of 12kHz.

REAR PANEL

10. AC INLET with FUSE HOLDER

Application Example (2)......Lecture Hall/ Conference Room

12 CHANNEL LINE MIXER

11. DC POWER SUPPLY

The RMX112 preamplifier can also operate using 24V DC power supply. When both the AC and DC source is connected, it shall operate using AC main, whereas the DC supply shall only be consumed whenever the former fails.

12. LINE OUT

These stereo outputs are supplied with the XLR jacks, delivering signal output from all input sources.

13. MONO OUT

This 1/4" phone jack is unbalanced TRS connector. It can be regarded as a sum output of the left and right of MAIN MIX.

14. MIC OUT

This 1/4" phone jack is unbalanced TRS connector used for microphone output.

15. REC OUT (PHONE JACK)

These unbalanced RCA jacks are to be connected to recording media such as cassette tape recorder.

16. LINE INPUTS

Double-line inputs (RCA connectors for stereo music sources). The left and right channels are combined, resulting in a single mono signal that can be directed to one or two the audio outputs.

17. LINE/MIC/PHANTOM POWER SWITCH

This switch is used for selecting the LINE, MIC or phantom power (+18~21V). Push the switch to left, the input enters into LINE mode; put the switch in the middle position, the +18V phantom power come into force; and push the switch to right, the input becomes MIC mode.

18. MIC/LINE INPUTS

These balanced/unbalanced combo connector are used for the MIC/LINE signal input.

19. MIC 1 PRIORITY POTENTIOMETER

The muting circuitry activates in the presence of a signal from Mic 1. This potentiometer determines the mixing level of the Mic or line input signals, with signals of priority

channels. Adjusting it to the minimum shall cut off all other inputs when a signal is present in the priority channel

(Mic 1), whereas setting it to the max shall allow the free mix of all signals including priory input. Some applications shall not require this feature, such as in the hall of prayer, thereby to bypass the circuitry, adjust the level to the maximum.

The above schematic shows a simple setup for sound reinforcement in lecture theatres and

conference rooms.

Note that the priority mute is set to minimum to allow the free mix of signals from all channels.

Application Example (1)......Paging System

INSTALLATION AND CONNECTION

PL.

E PA

SEL

NE 1

.A.

AUX IN

PUT

STE

D S/

OVL-

D S

B S

T P

Reco

E VE

INP

NPU

T 1

MONITOR SP

EAKER

HP HP

MONO OUT

12 CHANNEL LINE MIXER

The above schematic illustrates a setup for a basic uninterrupted paging system.

Note that the priority mute level potentiometer is adjusted to the maximum to allow the mute feature to be fully active. This level can be adjusted midway or so, if it is to allow a paging to be made with background music audible at lower volume. Other equipment such as an amplifier changeover, back up batteries etc. are not shown, which may be required according to the building design requirements.

Not paying enough attention to the input signal level, to the routing of the signal and the assignment of the signal will result in unwanted distortion, a corrupted signal or no sound at all. You should follow the following procedures for every single channel:

1. By connecting mics or instruments, make sure that the power of all your system's components, including the preamplifier is turned off. Also, make sure that all of the input and output controls of your preamplifier are turned down. This will avoid damage to your speakers and avoid excessive noise.

2. Properly connect all external devices such as mics, mixers, speakers and effects processor.

3. Turn on the power of any peripheral devices, then power up the mixer. Note: the power amplifier or powered monitors shall be turned on after the RMX112 and turned off before the RMX112.

4. Set the output level of your RMX112 or the connected power amplifier properly.

5. Set HI, MID and LOW EQ controls to the middle position.

6. While speaking into the mic (or playing the instrument), adjust the channel level control to maintain good headroom and ideal dynamic range.

7. You can shape the tone of each channel by adjusting the equalizer controls as desired.

CONNECTION

12 CHANNEL LINE MIXER

DAT or TAPE

REC

ORDER

POW

AMPLIFIER

POWER AMPLIFIER

OR SPEAKER

Significant Difference of Unbalanced / Balanced Connections

• In an unbalanced system, only one conductor carries the useful signal while the other is ground.

• Cables that run over a distance may act as an antenna picking up radiation from AC sources or from

dimmers as well as other noises. As there are no out of phase signals in the cabling, the noise signals shall superimpose with useful audio signal.

• If the signal level is rather small, they will be amplified as a lot of signal; thereby humming etc. is heard together with audio signal.

Note: The effects of radiation would not be diminished.

• This could be a huge issue if the cable is run over a long distance, which crosses with other cabling, like a dimmer system, for example.

• Noise may appear in a balanced system, but at a much lower magnitude compared with an unbalanced system.

• Microphones that generate amplitude in millivolts require a better signal carrying method i.e. a balanced system.

• Signals produced are out of phase with each other and when reaching the op-amp, one conductor shall be positively amplified, while the other inverted.

• Noise that doesn't have polarity shall be cancelled at the op-amp output. Therefore the useful signal is amplified twice while the noise is subdued.

For an understanding of how the works can be easily illustrated, see the diagram below:

The Proper Cabling - Ground Looping

It is important that the mains power is connected to your equipment with earth and the power system has a proper earthing. When hum exists, it is possibly due to poor grounding connection of your system. There should only be one ground point in the entire system.

Pin 1 of XLR source equipment should be connected whereas at the destination, the pin is dismantled. This shall eliminate grounding loop due to connections of signal ground and power ground. A looped cable resembles an antenna picking up hum and other electromagnetic radiations. Although earthed equipment may cause mains hum, disconnecting signal screen is a preferred choice as it has resistance rather than earth ground.

Pulse RMX112 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual