User's Manual - Certon Audio
Contents
1. User s Manual for Certon M21 Power Amplifier CLIP PROT a a Certon Ce rton Certon M21 User s Manual Safety Instructions e Do not use near water e Do not expose to rain or moisture A lightening bolt triangle e Clean only with dry cloth e Do not block ventilation is used to alert the user of e Do not place on a soft surface the risk of electric shock e Do not operate near a heat source or in a confined area An exclamation point e Do not use with a damaged power triangle is used to alert the cord user of an important e Use main plug to disconnect from operating or maintenance power grid instruction e Do not remove cover Ce rton Certon M21 User s Manual Getting Started Thank you for purchasing the Certon M21 monaural power amplifier The M21 features patent awarded technology for achieving powerful high fidelity sound from a small enclosure The M21 is typically used in a stereo or multi channel set up Each channel requires its own power amplifier Simply connect each M21 in a set up to its respective loudspeaker The M21 has loudspeaker output binding posts that accept bare wire banana plugs or forks Pay attention to the polarity of the loudspeaker Make sure the wires are firmly attached and are not short circuiting the outputs of the amplifier Connect the RCA type phono or XLR input of the M21 to the audio output of your pre amplifier home theater processor or other simila2. all wires Attach the loudspeaker cables to the positive and the negative loudspeaker binding posts 2 of the M21 Pay attention to the phase In general the positive terminal of the loudspeaker should be connected to the positive binding post of the amplifier and the negative terminal of the loudspeaker should be connected to the negative binding post of the amplifier Tightly secure the terminals The M21 is non inverting Do not short circuit the loudspeaker terminals Protection circuitry within the amplifier will protect the unit from most overload conditions but short circuits may seriously harm your M21 It is recommended not to use loudspeakers with a nominal impedance of less than 4 ohms N It is advised not to use highly capacitive loudspeaker cables as this reduces the phase margin of the amplifier and may potentially cause failure M21 has both RCA type and XLR inputs Attach an RCA type or XLR signal cable between the audio input 3 4 of the M21 and your pre amplifier home theater processor or corresponding unit The RCA type connector offers unbalanced operation while the XLR connector offers balanced operation Be sure to put the toggle switch 5 in its appropriate position N Do not connect both RCA type and XLR cables simultaneously as this may harm your pre amplifier home theater processor or corresponding unit Be sure not to connect the audio input of the M21 to a line output Doing so may cause damage to you
3. ay require servicing by a qualified technician Do not repeatedly reset the M21 without taking consecutive action to try to resolve the problem with DC offset as this may subject the amplifier to unnecessary stress In the event of loud thumps clicks or pops from the loudspeaker at reset do not proceed but seek assistance from a qualified technician There is a heat switch inside the enclosure The heat switch protects the amplifier against excessive and potentially harmful temperatures that may result e g from loud listening for prolonged periods at elevated ambience temperatures When the heat switch trips the amplifier turns off As soon as the temperature is safe again the amplifier is ready to be turned on again Specification 2 8 kg 6 2 1b
4. dicator blinking e g less than a second apart or a steady light is generally indicative of extensive clipping that may seriously harm your loudspeakers Subjecting your loudspeakers to extensive clipping may void warranty A low wattage amplifier like the M21 is more prone to clipping than a high wattage amplifier and may thus be more harmful to loudspeakers at a specific loudness than a high wattage amplifier Immediately turn down the volume or halt playback in the event of a frequently blinking or steady clip indicator light Maintenance It is recommended to use a dry non abrasive cloth to clean the amplifier Do not use detergents or other strong chemicals to clean your Certon M21 amplifier Ce rton Certon M21 User s Manual N There are no user serviceable parts inside the enclosure Opening the cover exposes high voltage surfaces that may cause electric shock Your Certon M21 has a DC protection circuit through which DC faults are detected In the event of a malfunction within the unit or in another component of your audio system that leads to a DC offset the M21 shuts down A LED indicator 11 indicates that a DC fault has occurred This may be a single event or a persistent condition Try to reset the amplifier by turning it off and then back on If the problem persists try a different pre amplifier or completely turn off the pre amplifier and reset the M21 once more If this does not rectify the problem your M21 m
5. r audio equipment Make sure the audio source toggle switch in the back is in its corresponding position Attach the power cord to the power inlet of the amplifier and to a power grid outlet Turn on the power switch at the back of the M21 and press the on off push button on the front panel Your M21 should be ready for operation in a few seconds in which case a steady light from a LED on the push button would indicate this cani adi ase Ce rton Certon M21 User s Manual Controls CLIP PROT T Di Certon D D RIS NM D I S S EE LI RAR AUDIO INPUT AU Lit H C C OUTPUT Certon MODEL MX SLRIAL HO UE sf RISCOF FT FSTRI RADE DO SOT OFCN NO UZER SERVICEABLE FARIS INSIDE tal On off mains switch 5 Bal unbal Switch 9 On off push button Loudspeaker terminals 6 Trigger in 10 Clip indicator RCA audio input 7 Trigger out 11 Protection indicator XLR audio input 8 Power inlet Ce rton Certon M21 User s Manual Installation Place the M21 on a stable surface The unit has a self resetting heat switch however N Do not place the amplifier on a thick cloth or carpet as ventilation would be obstructed Do not place in a confined area Clearance should be allowed for heat dissipation on the top and sides of the enclosure N The M21 is equipped with a mains power switch 1 at the back of the unit During installation keep the power switch in the off position Firmly attach
6. r loudspeakers and your hearing Ce rton Certon M21 User s Manual M21 has a 12 VDC trigger input 6 and output 7 You may daisy chain several amplifiers Simply connect a trigger output of one unit to a trigger input of another unit Doing this enables all units to be powered up by control from your pre amplifier home theater processor or corresponding unit Attach the power cord between the power inlet 8 of the amplifier and a power grid outlet Turn the power switch at the back of the M21 to the on position Operation Your Certon M21 is now responsive to a 12 VDC signal on the trigger input 6 and to the actuation of the on off push button 9 on the front of the unit Either or both take the M21 out of stand by mode provided there is no fault condition The unit should be ready for operation within a few seconds A blinking operation mode indicator at the center of the push button indicates that the unit is starting while a steady light indicates that the unit is ready for use Removing the 12 VDC signal and or pressing the on off push button again takes the amplifier back to stand by mode When the unit switches on or off a discrete click pop or chirp may be heard in the loudspeaker This is normal for the M21 because of the absence of a relay in the audio signal path The amplifier has a clip indicator 10 The clip indicator is an instrument to determine an operating condition called clipping Frequent clip in
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