SPM 650 MANUAL - Chord Electronics
Contents
1. SPM 650 POWER AMPLIFIER MANUAL OPERATING INSTRUCTIONS INSTALLATION Your amplifier should be positioned to ensure a free flow of air over the rear heat sink and through the upper and lower grilles When driven continuously at well above average listening levels the temperature on the heat sink may exceed 50 C This is not a fault but an indication of the need for adequate ventilation Please ensure that the IEC mains lead is correctly terminated UK EUROPE Brown LIVE Black USA CANADA Blue NEUTRAL White Yellow Green EARTH Green THE SPM 650 MUST BE EARTHED AT ALL TIMES VIA ITS OWN MAINS LEAD FAILURE TO DO THIS MAY BE HAZARDOUS CE This unit complies with EN 50081 1 amp IEC 801 2 It has come to light that in some European countries a hum may occur if Pre and Power Amplifiers are connected to mains wall sockets which do not have an earth Please ensure that if this is the case the pre and power amps are connected via a multi way mains block which contains an earth point at each socket outlet This is to ensure that the chassis metalwork of each item is connected together and Chord Electronics Limited firmly recommend that an earthing method for the building is implemented lt gt lt gt REAR PANEL The two gold plated phono style connectors and XLRs are pre amplifier inputs Please connect these last with the amplifier switched off Right Left G ela 1 Mains Right Input2. Left Balanced Balanced Input Right Left Input Pin I Earth Input Input Pin 1 Earth Pin2 ve Phono Phono Pin2 ve Pin 3 ve Socket Socket Pin 3 ve q o 1 OPERATION When the amplifier is connected to the mains the LED immediately above the power switch will indicate red standby When switched on this LED will change to illuminate green operational There will be a delay of about 12 seconds before the output signal is fed to the loudspeakers this is to allow the amplifier to stabilise In the event of a major overload or a short circuit across the output of any channel the green power on LED will indicate trip by fading and immediately re illuminating to red standby mode The amplifier will shut down automatically and it should then be switched off When the fault condition has been rectified the amplifier can be switched on and will power up as normal A minimum period of eight seconds must be allowed to elapse between switching off and switching on again This is to allow the power supply protection circuitry to re set itself There are no user serviceable parts in your SPM 650 It should only be serviced by Chord Electronics Limited or their expressly approved Service Agents CARE AND CLEANING The SP
3. driven DYNAMIC HEADROOM 200W rms per channel into 8 360W rms per channel into 40 1 KHz 10 cycles on 90 cycles off FREQUENCY RESPONSE 8 OHMS 1dB 0 2Hz to 46KHz 3dB 0 1Hz to 77KHz FREQUENCY RESPONSE 4 OHMS 1dB 0 2Hz to 39KHz 3dB 0 1Hz to 75KHz SIGNAL TO NOISE RATIO Better than 103dB A weighted two thirds power CHANNEL SEPARATION Better than 95dB PRE AMPLIFIER INPUT CONNECTION 2 x gold plated fully balanced XLR sockets 2 x gold plated custom phono sockets unbalanced 20V square wave DIMENSIONS Standard 420mm w x 355mm d x 88mm h Made in England by Chord Electronics Limited The Pump House Farleigh Bridge Farleigh Lane East Farleigh Kent ME16 ONB United Kingdom Tel 44 0 1622 721444 Fax 44 0 1622 721555
4. M 650 requires no special care other than common sense Spray window cleaner clear type may be used if first sprayed on to a soft cloth to remove surface blemishes such as finger marks from the metal casing Never spray directly on to the amplifier and never use abrasive cleaning materials use only a lint free soft cloth as described SERVICE INFORMATION WARNING The power supply components within this amplifier 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 NEW TECHNOLOGY Much of what Chord has achieved is the result of using innovative leading edge technology For example we believe that we are unique in using the technique of dynamic coupling of the power supply rails Whatever transient demand is presented to the amplifier stages the positive and negative rails remain in perfect equilibrium with each compensating for the demands made on the other This means that power delivery is always balanced and free from ground loop modulation distortion This combined with enormous reserves of instantly delivered precisely controlled power is what makes the SPM 650 sound so effortless The power supply rails operate well above that which most amplifiers can accommodate This and other advanced technique
5. s enables the ultra high frequency low ESR power supply to store a great deal more energy far more efficiently Clipping is virtually impossible Furthermore compared to other amplifiers of a similar power rating the SPM 650 weighs in at a mere 9Kg Another new technique is used to protect the amplifier against overload internal and external short circuits The output signal path is totally free of any fuses or sound degrading resistive components often employed for overload sensing The SPM 650 is designed to surpass the highest European safety and electromagnetic interference standards The amplifier sections are also highly sophisticated designs that make the most of the best high voltage lateral structure MOSFETs available 2 x 300 watt devices per channel Combining the subtlety and musicality of a good valve design with the punch and accuracy of state of the art solid state products The result is a sliding bias class A B design with all drive circuitry operating in class A At usual listening levels most of the music will be reproduced in class A Chord s no compromise design philosophy means there is no better built amplifier Individually hand crafted it is constructed to aerospace standards from the circuit boards up Chord Electronics Limited SPECIFICATIONS SPM 650 POWER AMPLIFIER UTPUT POWER 130W rms per channel 0 05 distortion into 8Q 170W rms per channel into 4Q 200W rms into 20 Thermal limitation only 1 channel
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