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a/d/s/ 334im Installation Manual
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6 15amplifier requirementsa note on power handlingEach 3-series speaker system requires a minimum of 20 Watts per channel to achieve reasonablelistening volumes in a moving automobile without clipping the amplifier. a/d/s/ recommends150 Watts per channel as a maximum so as not to exceed the thermal or mechanical limitationsof the speaker system. Any amplifier between 20 watts and 150 watts per channel may beused. If you choose to use an amplifier with more power than 150 Watts be very careful, youcan damage the speaker system if played too loud.All a/d/s/ loudspeakers will produce reasonable volume levels in the automotive environmentusing moderate amplifier power. However, the use of a low powered amplifier to try and attainvery high volume levels can lead to overdriving the amplifier. This will generate high distortionlevels which can easily damage loudspeakers, even when the amplifier’s rated power is farbelow the maximum rated power of the loudspeaker.As a rule, do not turn the volume up above the point where you hear distortion on musicalpeaks from either an overdriven amplifier or mechanical noise from an overstressed speaker. Forthe best performance and reliability, select an amplifier with slightly more than the maximumpower you are likely to need to generate the desired volume levels. This margin of reservepower will ensure that the amplifier will not attempt to deliver more than its design allows.Warning: Excessive sound pressure level can permanently damage your hearing. The maximumvolume levels attainable with a/d/s/ speakers, combined with high-power amplification, mayexceed safe levels for extended listening. When listening at high volume levels always usehearing protection or turn it down!mounting locationsThere are many possible choices of mounting locations. The automobile factory locations willusually dictate the speaker mounting position.controls and connectionstweeter level controlThe three position switch in the crossover box labeled low mid high adjusts the relative volumeof the tweeter with respect to the midrange. The mid position is referenced as equal outputfrom the midrange and tweeter. The hi position offers 3dB more output from the tweeter. Thelow position is 3dB less output.Adjust this control to your listening preference.troubleshootingsymptom probable cause remedyno output source or amplifier not turned on check source or amplifier and fix asneededaudio input not connected or no check RCA connections and signaloutput from source integrity, fix or replace as neededprotection circuit activated turn down volume. Protection will selfresetspeaker wires not connected check speaker wires and fix or replace asneededaudio cycles on and off speaker damaged check system with known workingspeaker and fix or replace as neededthermal protection engaged check that amplifier has adequateventilation check speaker impedanceloadLoose or poor audio input check RCA, power and speakerconnections and fix or replace as neededdistorted output preamp volume set too high. check volume of preamp and adjustexceeding maximum capability appropriatelyof amplifier.Impedance load to amplifier too low check speaker impedance load, if below1 ohm rewire the speakers to achieve ahigher impedanceshorted speaker wires check speaker wire connections and fix orreplace as neededspeaker not connected properly check speaker wiring and fix or replace asneeded. refer to the speaker wiringsection of this manual for detailedinstructionsspeaker damaged check system with known workingspeaker and fix or replace as neededpoor bass response speakers wired with wrong polarity check speaker polarity and fix as neededcausing cancellation at low frequencieslack of stereo separation speakers wired with wrong polarity. check speaker polarity and fix as neededstereo / bridge switch set to bridge set switch to stereo positionpositionspeaker connected across wrong check that the speaker wires are notoutput terminals connected to the bridged terminals andfix as neededsource set to mono check source and adjust controls asneededanalog and digital systemsone progress waywilmington, ma 01887usaIf you want to consult the factory, write or call our customer service department:Customer Service Departmentanalog and digital systems, inc300 wildwood avenuewoburn, ma 01801ph 781.729.1140fax 781.729.3535 |
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