Mission 770 Freedom
2-way reflex loudspeaker system (1984-85)
We are confident that the 770 Freedom is a worthy successor to our legendary 770. Our objective in replacing the 770 was to improve on that model in certain specific areas.
Firstly, we wanted to ensure that the frequency range was even more extended. Secondly, our design team felt that the bass response could be tighter and with greater transient attack. Thirdly, we wanted to increase the available headroom so that at high power levels the system did not go into saturation. Finally, we wanted to increase efficiency for the era of digital master tapes.
For the mid/bass drive unit a brand new cone was developed made of an advanced homopolymer material impregnated with certain minerals (the formula not being made public by Mission) to offer optimum mass, rigidity, Q and sonic opaqueness - a further advance on polypropylene.
The voice coil is manufactured using high temperature aluminium former and is carefully ventilated to increase power handling. The motor system is exceptionally powerful for the amount of magnet we have used and this has been achieved by careful geometric design of the pole piece which in turn is brass plated. This arrangement results in minimal magnetic flux wastages into stray fields.
The driver is assembled into a sophisticated rigid magnesium diecast chassis. The high frequency unit is carefully designed for extreme power and exhibits exceptional power / frequency response linearity and no major saturation at high levels. It is further oil cooled to avoid temperature related performance aberrations and for increased saturation thresholds.
The cabinet construction is based on Mission's unique multi-folded geometry ensuring rigidity for low frequency transient attack without coloring the very open and transparent mid band. The cabinet walls are visco elastically damped to control and attenuate resonances and minimise stray acoustic output to ensure minimal acoustic phase distortion.
The Freedom's low frequency behaviour is totally unusual for a reflex loudspeaker and this has been achieved by careful integration of the drive unit Qs in relation to the 37 litres of internal volume and the use of the Mission resistive reflex port.
The Freedom is a powerful expression of Mission's experience and technology. Subjectively, and when used in conjunction with good quality ancillary equipment, the results are exhilarating and most realistic.
Type: 2 way, 2 driver loudspeaker system
Frequency Response: 35Hz to 20kHz
Recommended Amplifier: 30 to 150W
Crossover Frequency: 1900Hz
Bass: 1 x 215mm homopolymer cone
Tweeter: 1 x 25mm polyamid super ellipse
Enclosure: bass reflex
Finish: walnut, black ash, grey
Dimensions: 620 x 260 x 320mm
If you have any problems opening files please read the download FAQ. All files are provided under strict licence and reproduction without prior permission or for financial gain is strictly prohibited.
If you have additional documentation please consider donating a copy to our free archive.