Mission 780 Argonaut
2-way reflex loudspeaker system (1984-85)
The 780 Argonaut is a brand new Mission product. It is important to point out at this stage that by the nature of its design the Argonaut presents amplifiers with both complex and difficult loads.
That is to say, the characteristic impedance at certain frequencies can drop to around 3.5 ohms and even though the phase shift angles are kept to a minimum and for the most part the impedance is purely resistive, nevertheless this can present problems for ordinary amplifiers.
This means that only exceptionally well designed amplifiers should be used to drive the Argonauts otherwise the sound quality will be poor and the amplifier could suffer damage. Many good British and American amplifiers, however, are designed to deal with such loads and all Mission designed amplifiers, including the little Cyrus I, are perfectly capable of driving the Argonauts.
The Argonauts are truly exceptional speakers unmatched by any other model at any price.
Firstly, for 2.83V of input a single Argonaut produces approximately 94dB of output measured at 1 metre.
Secondly, whereas speakers of such sensitivity always lack deep bass, the Argonauts are extremely well extended in low frequencies.
Thirdly, whereas nearly all ultra high efficiency speakers use light paper for their cone material and suffer the associated colourations, the Argonaut uses modern polymer based engineering materials and has no significant audible or measured colourations or distortions.
The whole speaker is manufactured from MDF rather than conventional chipboard and the walls are visco elastically damped.
Type: 2 way, 3 driver loudspeaker system
Frequency Response: 30Hz to 20kHz
Recommended Amplifier: 50 to 200W
Crossover Frequency: 1700Hz
Bass: 2 x 215mm homopolymer cone
Tweeter: 1 x 25mm polyamid super ellipse
Enclosure: 55 litre, bass reflex
Finish: walnut, black ash, grey
Dimensions: 950 x 260 x 320mm
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