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Redback A 2548, Operating Manual, Page: 9 / 12

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Redback A 2548 Operating Manual Download Page 9

Controls and Functions

17. MAIN L/R knob/MUTE switch

Use the knob to adjust the volume of audio signal sent to the powered speakers or a powered amplifier 
connected to the MAIN OUTPUT jacks (balanced / unbalanced). MUTE: Press to mute all audio output 
to the MAIN OUTPUT jacks. (You can still hear the master mix audio in connected headphones through 
PHONES).

18. Input level knobs

Set the volume so it’s balanced between each channel i.e. no source is overpowering the others:
• Adjust the volume of the guitar input or other mono source connected to CH2 INST.
• Adjust the volume of the keyboard input or other stereo or mono source connected to CH3-CH4.
• Adjust the volume of the computer input via the USB PLAYBACK terminal.

Note: The sound input from the computer via the USB 2.0 terminal can only insert into the 
mixer audio before the PHONES and MAIN L/R output volume level control knobs. See mixer 
block diagram (Figure 4)

19. USB TO COMPUTER (USB 2.0 Terminal)

This terminal allows you to connect a computer to the mixer, in effect making the mixer function like an 
external USB sound card. When connected, the computer will supply power to the mixer, and also allow 
audio to be sent between the computer and the mixer (USB PLAYBACK).  The USB PLAYBACK input 
cannot be sent back to the computer for recording i.e. this mixer does not have LOOP-BACK feature!  
But it does take the sum of the analogue channel mix audio (Left and Right) back via the USB 2.0 
terminal to the computer, where it can be recorded on compatible audio software. Each input control 
(CH1-4) on the mixer sets that channel’s volume in the sum of channels mix that is then uploaded to 
the PC via the USB Interface.

Caution: Do not connect any device to the USB 2.0 terminal that is not a personal computer 
or tablet. Please read the safety precautions for the USB power adapter or USB mobile 
battery that you are using. Use a power source and cable that can supply power via a USB 
male type B plug based on the following USB standards; Output Voltage: 4.8V to 5.2V and 
Output Current: 0.5A or greater.

Summary of Contents for A 2548

Page 1: ...annel Mixer With USB Output Effects www redbackaudio com au Note Please read this manual thoroughly to get the most out of the product and ensure long term trouble free use Keep this manual for future reference www altronics com au ...

Page 2: ...es Ultra compact design Powered via USB USB Stereo Input Output Mixer functions like an external soundcard for computer connectivity Windows Mac OSX compatible works with most software drivers e g Audacity Cubase 4 Input Channel Mixer 2x Mono 1x Stereo with L Mono Balanced or Unbalanced Fader level control on CH1 input XLR TRS Combo socket Phantom Power 48Vd c on CH1 for condenser mics 3 Band EQ L...

Page 3: ...nob MUTE switch 8 CH2 INST Guitar INPUT jack BAL UNBAL 9 INPUT INST LINE LINE INST HI Z Impedance switch 10 CH3 CH4 input line jacks 6 35mm or 1 4 BAL UNBAL Figure 1 11 MAIN OUTPUT Monitor jacks BAL UNBAL 12 PW power on LED 13 PHONES output jacks 6 35mm 3 5mm 14 MIC TO CH1 input jack 3 5mm 15 OUTPUT LEVEL meter SIG CLIP 16 PHONES volume knob 17 MAIN L R volume knob MUTE switch 18 INPUTS level knob...

Page 4: ...flashes when the input audio volume is at its loudest 3 PAD 20dB switch Turning the switch on will attenuate the sound input to CH 1 If you hear distortion or the CLIP LED lights frequently despite the GAIN knob being turned fully to the left then turn PAD on Note Slide the fader to minimum before toggling the PAD switch on and off Otherwise a noise spike may be produced 4 PHANTOM POWER Switch 48V...

Page 5: ...ly connecting an instrument with high output impedance to the CH2 INST unbalanced mono input jack such as an electric guitar or bass Release this switch when connecting a regular line level unbalanced mono instrument to the CH2 INST phone socket CAUTION When operating this switch use an unbalanced cable with phone plugs for connecting devices to CH INST and turn all output controls such as the MAI...

Page 6: ...MID HIGH CLIP 6DB FADER FX MAIN_L MAIN_R FX MAIN_L MAIN_R FX CH2 INST LINE INST HI_Z SIG LEVEL MAIN_L MAIN_R CH MIX_L CH MIX_R CH3 CH4 INPUT SIG LEVEL MAIN_L MAIN_R USB_REC_L USB AUDI STEREO IN USB POWER FX MAIN_L MAIN_R POWER 48V MAIN_L MAIN_R AD DA DC DC CONV Figure 4 Mixer Block Diagram ...

Page 7: ...ELAY MUTE LEVEL MAIN MIX_L MAIN MIX_R MUTE CLIP SIG MAIN LEFT MAIN RIGHT PHONES OUTPUT PHONES HEADSET PHONES LEVEL MAIN OUTPUT LEVEL USB_REC_R SIG LEVEL PLAYBACK_L PLAYBACK_R IO INTERFACE NPUT OUTPUT 5V 48V GND VCC VDD DC AC C VERTER ...

Page 8: ...sets 14 MIC TO CH1 Headset Microphone input plug For connecting a 3 5mm microphone plug for your headset The unbalanced mic s audio input is sent to CH1 pre EQ Pre Fader 15 OUTPUT LEVEL meter SIG CLIP If the sound level sent to the computer via the USB interface exceeds 3dBu SIG green LED will turn on If the level reaches 3dB before clip level 6dBu CLIP red LED will light up To send the appropriat...

Page 9: ...TO COMPUTER USB 2 0 Terminal This terminal allows you to connect a computer to the mixer in effect making the mixer function like an external USB sound card When connected the computer will supply power to the mixer and also allow audio to be sent between the computer and the mixer USB PLAYBACK The USB PLAYBACK input cannot be sent back to the computer for recording i e this mixer does not have LO...

Page 10: ...vel Knob Signal LED 3dB Level Knob Output Channels MAIN L R Out 1 PHONES 2x Stereo includes HEADSET phones 3 5mm 1x Stereo Effects 2x2 point L R LED meter CLIP SIG DC 5V 500 mA via USB Max 2 5W 124 x 40 x 157 mm 0 67kg Stereo Input Output USB Audio Class 2 0 like external sound card to PC Sampling Frequency Max 48KHz Bit Depth 16 Bit Connector Type B Signal LED 3dB Playback LEVEL Knob Stereo ADC T...

Page 11: ...erent Using the device while condensation is present can cause damage Avoid setting all equalizer controls and faders to their maximum setting Depending on the condition of the connected devices doing so may cause feedback and potentially damage the speakers Do not apply oil grease or contact cleaner to the faders Doing so may cause problems with electri cal contact or fader motion When turning on...

Page 12: ... R A number must accompany the goods to effect the repair d Altronics will pay the return freight to the customer where the warranty claim has been accepted e Please quote the R A number in any correspondence to us 2 FOR OVER THE COUNTER PURCHASES to make a warranty claim please return the goods to us in any of our stores with a copy of your proof of purchase tax invoice a Upon leaving the goods a...

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