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Mission 737 Renaissance by betty

Specifications

Earlier versions of Mission 737R with Silver Baffle and Vifa/Audax Tweeters

Later versions of Mission 737R with Dark Grey Baffle and Mission 19mm Tweeter

Size (H,W,D)

54cm (21in) x 26cm (10in) x 32cm (13in)

Weight

9.5kg (21lb)

Frequency response (3 dB)

40 Hz - 20kHz

Low frequency roll-off (-6 dB)

35Hz

Sensitivity

88 dB (1W/1M)

Background

The speaker's unique selling point was its innovative polypropylene drive unit, which was the latest version of that pioneered in the Freedom model (but by the mid-80's superseded in the 770 Freedom itself). Mission was the first licensee in the world for the British patent for polypropylene as a loudspeaker cone material and a large part of the Renaissance's sonic character derives from it, notably the airy, open midrange.

Design

The cabinet employed a transverse folded construction (the top, bottom and sides had 45-degree mitred faces, with the back and the baffle separate). Despite a substantial internal volume the loudspeaker was stand mounted. Purpose-designed stands made of vinyl covered particle board fitted into slots in the speaker's base.

The period of this loudspeaker's manufacture coincided with a trend throughout the product range for unusually substantial front baffles. In the case of the Renaissance this took the form of 25-millimetre (0.98in) thick MDF, which was a comparatively novel material for loudspeaker enclosures at the time. The disproportionate thickness of the front baffle was not common at the time (most loudspeaker enclosures used the same material, normally a less dense type of fibre board than MDF, for the entire enclosure). In many ways this was a forward-looking approach as a considerable number of contemporary loudspeaker designs adopt this principle.

The various versions of the 737 Renaissance, aside from comparatively minor cosmetic details (and the provision of bi-wiring in the last model), differed significantly only in the type of [[tweeter]] employed. The first versions, circa 1984, used a 25-millimetre (0.98in) ferrofluid cooled soft dome unit made by Vifa. Slightly later versions (circa 1985/6) used a then-popular Audax TW025A0 25-millimetre (0.98in) doped fabric dome tweeter (which is still in production today). In both cases the front baffle of the speaker was finished in a dimpled silver colour with either 'Mission 737' or Mission Renaissance' printed in black between the mid/bass driver and reflex port. The last version (circa 1986 onwards) used Mission's proprietary 19-millimetre (0.75in) ferrofluid cooled polymer dome tweeter. Along with the provision of bi-wiring, the front baffle on these models was a dark matt grey colour, with the word 'Renaissance' printed (usually in red, but sometimes in white) between the mid/bass driver and reflex port. See illustrations above.

The high quality polypropylene bass/mid driver was the 737's main technical feature. Not only did the system derive a sizable part of its sonic character from this device but it also derived its name. "After many years of evolutionary refinements the most advanced version of the 770 drive-unit is now designed into the 737 Renaissance. The Renaissance was called as such because really it was the latest, most highly developed version of the original 770 Freedom (specifically the Mk III Freedom) in everything but its name; the 770 Freedom itself had undergone 'revolutionary' changes and was now positioned above its stablemate.

Mission described the innovative drive unit as follows: "The cone membrane for this model offers a unique combination of rigidity, Q, lightness, and acoustic obaqueness. The drive unit is manufactured into an esoteric die-cast magnesium chassis to improve rigid coupling. The acoustic properties of the cone are such that they do not allow for internal reflections or standing-waves to come out of the cabinet and reach the listener out of phase.

Reviewers for HiFi Choice Magazine noted the 'surprisingly energetic bass performance' and the ability of the woofer to sustain 500 watts of peak input (bass guitar) . At the time, many contemporaries were unable to withstand more than 20 watts. The semi-transparent polypropylene woofer cone is terminated by a substantial inverted natural rubber surround, and it has a large black domed dust cap. The speakers are internally wired with proprietary 4-millimetre (0.16in) speaker cable.

A stylistic as well as performance-related aspect of the design was the use of a cellular port instead of the more simplistic 'tunnel port' (through which one could clearly see any acoustic wadding inside). The principle of the cellular port design is to reduce any undesirable acoustic affects of turbulence.

Sound

The design was commended for its excellent mid-range clarity, which was felt to be natural and airy sounding, however, some reviewers regarded the system as a little bright sounding, others that the bass was slightly bloated. Nevertheless, it was certainly a popular model with owners, who regarded it as a very powerful sounding loudspeaker with excellent bass extension and a crystal clear quality to the reproduction with good stereo. This is a popular model even to this day, with second hand examples achieving comparatively high prices.

Later Models

The Mission 737 Renaissance occupied a place in the top half of a product range that included the award winnin Mission 70 speaker, the Cyrus 1 amplifier, the DAD7000 CD player and the 774LC tonearm. With the dawn of the 1990s the 737's became the floor standing 763's. The Renaissance and 737 labels have not been applied to any of Mission's speaker systems since, although polypropylene drive units are now widespread. In historical terms, the 737 Renaissance was the peak of development for the original 770 Freedom.

See Also

Mission Leading Edge Loudspeaker

Mission 707 Loudspeaker

Mission Freedom Loudspeaker

Mission Argonaut Loudspeaker

References

^ Mission Electronics (1987). The Human Touch [Product Brochure]. Cambridge: Mission Electronics Group.

^ Mission Electronics (1987). The Human Touch [Product Brochure]. Cambridge: Mission Electronics Group.

^ Mission Electronics (1987). The Human Touch [Product Brochure]. Cambridge: Mission Electronics Group.

^ Colloms, M. (1980). Hi-Fi Choice No 21 Loudspeakers(4). London: Sportscene.

^ Sinclair. I. R. (2000). Audio & Hi-Fi Handbook. Oxford: Newnes.

^ Colloms, M. (1980). Hi-Fi Choice No 21 Loudspeakers(4). London: Sportscene.

^ Mission Electronics (1992). The Human Touch [Product Brochure]. Cambridge: Mission Electronics Group.

Categories: Loudspeakers

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