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1. Service Agents 14 frequently asked questions about the MEZZO 50 or MEZZO 140 the amplifier is on and the switches are on but there is no sound coming out Have you pressed the correct output from your pre amplifier the sound is vague and ill defined Check that both loudspeakers are connected correctly ve to ve or red to red and ve to ve or white to white on both sides there is a buzzing sound coming from the loudspeakers The system may not be properly earthed or the interconnect cables may be running near to mains cables I have connected my 3 channel amplifier to my processor and the main left and right out of my AV processor in to my hi fi but there is very little sound coming out of the left and right speakers Have you set the volume on your stereo pre amplifier to the correct gain to match the other channels in the system 15 162. post red post MEZZO 50 MEZZO 50 power amplifier power amplifier left right left ft output output 2 pre amplifier DAC 64 phono stage CD BLU Transport Bridged mono connections for the MEZZO speakers left output right output left output right output red post red post red post red post MEZZO 50 outputs MEZZO 50 power amplifier power amplifier balance Y ba NVa Y lead PRIMA pre amplifier SYMPHONIC DAC 64 phono stage op BLU Transport Bridged mono connections for the MEZZO using the PRIMA 10 speakers left outputs red and white posts right outputs red and white posts MEZZO 50 power amplifier pre amplifier DAC 64 phono stage op BLU Transport Normal stereo connections for the MEZZO automatic bridged mono mode on the MEZZO 140 To run Mezzo 140 as a bridged mono amplifier run an interconnect balanced XLR or RCA phono XLR recommended from the preamp output to the right input on the Mezzo Select phase switch DOWN on the right input and phase switch UP on the left input The right speaker terminal is now the positive and the left speaker terminal is now the negative The bridged amplifier is now phase inverting in line with other Chord amplifiers To run the amplifier non inverting reverse the phase switches so that right is UP and left is DOWN 12 everyday use of the MEZZO 50 or MEZZO 140 ph
3. the mains cable into the power connector of your Choral product and the male end plug of the mains cable into mains wall socket or mains extension socket Earth Mains Connector Mains Switch Live Neutra Mains connector and ral oh powering up Press the bottom part of the power switch labelled I powering down Press the top part of the power switch labelled O connecting your MEZZO 50 or MEZZO 140 You need to connect the outputs from your pre amplifier to your power amplifier and then connect your power amplifier to your loudspeakers There are two pairs of inputs You can connect to either the XLR or RCA outputs but not to both types at the same time All connections should be made with the power turned off connecting to your power amplifier using XLR style inputs Use XLR style connectors to connect the Right output from your pre amplifier to the Right balanced input the Left output from your pre amplifier to the Left balanced input connecting to your power amplifier using unbalanced RCA style inputs Use RCA style connectors to connect the Right output of your pre amplifier to the Right input phono socket the Left output of your pre amplifier to the Left input phono socket connecting your loudspeakers Connect a pair of loudspeakers to the Left and Right outputs on the MEZZO Each output on the MEZZO has a red and white connection that should be connected to colour matched termi
4. ase switching you can choose the phase of the signals that are sent to your loudspeakers to account for varying speaker configurations There are two phase shift toggle switches on the MEZZO one for each output The diagram on the page 28 shows these two switches When the switches are in their UP position the signals that are at the outputs are inverted by 180 degrees When the switches are in their DOWN position the signals at the outputs are non inverted with no phase shift automatic shutdown 1 If there is a major overload or short circuit the MEZZO will detect this and shut down automatically and the amplifier will go into bounce mode When in bounce mode the visible interior of the MEZZO will flash with blue illumination The MEZZO should then be switched off immediately at the mains 2 When the fault has been rectified the power amplifier can be switched on and will power up as usual You should wait at least two minutes before turning the amplifier on again at the mains to allow the power supply protection circuitry to reset itself 13 maintenance of the MEZZO 50 or MEZZO 140 cleaning To clean finger marks and other blemishes from your amplifier spray clear glass cleaner onto a soft lint free cloth and then use the cloth to gently clean your amplifier servicing There are no user serviceable parts in your Chord amplifier and it should only be serviced by Chord Electronics Limited or their expressly approved
5. ich contains an earth point at each socket outlet This is to ensure that the chassis metalwork of each item is connected together 2 We recommend that an earthing method for your building is implemented 3 Use the connecting points on your Chord unit and connect to an available earth point safety warnings It is important that your equipment is earthed at all times via its own mains lead Failure to do this may be hazardous The power supply components within the units are designed to be operated at lethal voltages and energy levels Circuit designs that embody these components conform with applicable safety requirements Precautions must be taken to prevent accidental contact with power line potentials Do not connect grounded test equipment This unit complies with EN 50081 1 and IEC 801 2 Caution The BLU employs a laser that emits both visible and invisible radiation Removal of the top cover or tampering with any of the enclosed electronics may result in exposure to hazardous levels of laser radiation that could cause eye damage To prevent injury this product should be returned for qualified service to Chord Electronics Ltd There are no user serviceable parts within any Chord Electronics Choral product Unauthorised tampering or dismantling of this product will invalidate the warranty and could cause injury mains connection The mains connector of your Choral product is at the back of the unit Plug the female end socket of
6. ier on one channel only I e output 1 left channel and output 2 left channel Plug these into the balanced inputs on the first MEZZO Switch the right channel phase switch to its up position and the left channel phase switch to its down position Plug one loudspeaker across the red speaker terminals only one red post is on the left output and one red post is on the right output This will now be bridged Repeat the process with the second MEZZO for the right channel making sure all the connections and switch settings are identical as for the left channel Connect the output 1 right channel and output 2 right channel of the pre amplifier to the balanced inputs of the second MEZZO Again switch the right channel phase switch to its up position and the left channel phase switch to its down position As before connect the second loudspeaker across the red speaker terminals only bridging using the PRIMA pre amplifier If you are using a PRIMA pre amplifier in your system you need to bridge two MEZZO power amplifiers using two balanced Y leads as the Prima has only one balanced output So you need to feed both channels of one MEZZO amplifier with the same signal 1 e either right or left You only use the two red terminals when bridged So Right Red remains as is and Left Red becomes Right return or Black in the case of most speaker cables speakers left output right output left output right output red post red post red
7. nals on your loudspeakers Note The WBT rhodium plated 4mm speaker binding posts will accept 4mm banana plugs WBT 0645 or WBT 0644 or 6mm spades WBT 0680 Making connections using bare wire 1s not recommended RIGHT PHASE SWITCH LEFT PHASE SWITCH PUSH RIGHT INPUTS LEFT INPUTS RIGHT OUTPUTS LEFT OUTPUTS Connections on the MEZZO manual bridged mono connections for your MEZZO 50 There are two main ways that your MEZZO can be connected to loudspeakers One is the normal stereo configuration as assumed on the previous page See page 32 for a diagram The other way to connect your MEZZO to loudspeakers is the bridged mono configuration See page 30 for a diagram bridged mono configuration using existing Chord pre amplifiers other than the PRIMA The bridged mono configuration allows two separate power amplifiers to be used in a system each feeding a separate loudspeaker In this manner each power amplifier only carries the signal for the left or right channel of audio This ensures that cross talk distortion or interference that may normally occur between the left and right channels is completely eliminated Please note that Chord equipment is designed to the highest possible standards available so if this bridged mono configuration is not adopted and a normal stereo configuration is used you will still be experiencing audio quality of the highest standard Take two balanced outputs from the pre amplif
8. welcome Thank you for buying a Chord Electronics product Before you start to enjoy using your Chord Electronics product please take a couple of minutes to read how to connect your audio equipment and loudspeakers to your Chord Choral product and how to maximise your listening experience user guide for power amplifiers MEZZO 50 Pages 6 15 MEZZO 140 Pages 6 15 background We want you to be confident using your new Chord Electronics product You are probably an audiophile with extensive knowledge of audio equipment However you may not be So in the following section we explain a few basics to help you get started or get you back up to speed if you are a little rusty connecting your equipment Chord amplifiers are supplied with and designed to be connected using balanced inputs The interconnecting cables you use will depend on the available input and output sockets on your other equipment We have installed unbalanced inputs on all Chord equipment thus enabling you to mix Chord Electronics and other manufacturer s equipment Balanced inputs carry twice the strength of signal of unbalanced inputs and are able to be fed down long lengths of cable with less deterioration of signal They are also less prone to interference than unbalanced inputs Balanced inputs have three pins and use Neutric XLR style connectors Pin 1 is earth pin 2 is positive and pin 3 is negative Unbalanced inputs use RCA phono connectors
9. which are gold plated with teflon high performance dielectric insulators for optimum performance speakers MEZZO 50 OR 140 Amplification power amplifier PRIMA Switching and pre amplifier level control DAC 64 phono stage analogue conversion Source BLU CD Transport Basic system diagram when setting up To ensure that your Chord product works efficiently and safely please pay particular attention to the following issues ventilation Your Chord product should have at least 5cm of clear space all around it to ensure a free flow of air at all times We do not recommend that you place your Chord product directly on a carpet as this can damage the equipment through blocked ventilation mains lead and plug All Chord equipment comes supplied with the correct mains lead and plug This should be used at all times if you need to fit a plug for UK Europe Connect the blue wire to the neutral terminal Connect the brown wire to the live terminal Connect the yellow green wire to the earth terminal if you need to fit a plug for US Canada Connect the white wire to the neutral terminal Connect the black wire to the live terminal Connect the green to the earth terminal earthing issues in Europe In some European countries a hum may occur if your processor is connected to mains sockets that do not have an earth If this is the case please ensure that 1 Your equipment is connected via a multi way mains block wh
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