Το ηχείο είναι μια ανανέωση του θρυλικού Studio Monitor Met 7 σχεδιασμένο από τον Dick Sequerra το 1977.

Η φιλοσοφία πίσω από το Catheram Seven δεν διαφέρει από τον «πρόγονο» του Sequerra Met 7, τα τεχνικά συστατικά είναι ίδια αλλά τα υλικά και τα  στοιχεία του καινούρια. Από την καλωδίωση έως τους πυκνωτές, ακόμη και η κατασκευή της καμπίνας που πια είναι από MDF. Η περίεργη «τάπα» εμπρός από το μεγάφωνο μιντ-γουφερ, που καθορίζει την εμφάνιση του ηχείου, επιτρέπει στην ευθυγράμμιση των κέντρων ακουστικών των μεγαφώνων, εξασφαλίζοντας έτσι την επιθυμητή χρονική συνοχή.

H εξαιρετικά στενή μπάφλα, όπως και το πίσω μέρος του ηχείου, δεν έχουν αιχμηρές άκρες, ενώ το πλάτος του είναι ίσιο με το μιντ-γούφερ. Η μεταλλική γρίλια που προστατεύει το μιντ-γούφερ αυξάνει την αισθητική του ηχείου, ενώ το φινίρισμα Vesmaflex προέρχεται από την αυτοκινητοβιομηχανία. Αυτό είναι πολύ ανθεκτικό στις γρατζουνιές και είναι εύκολο να καθαριστεί μ’ ένα υγρό πανί.


Πρόκειται για ένα ηχείο δύο δρόμων ακουστικής ανάρτησης, με γούφερ 5,1 ιντσών κώνου πολυπροπυλενίου, σασί από μαγνήσιο και ανάρτηση από ελαστικό. Το τουίτερ των 1,3 ιντσών έχει μαλακό θόλο με διπλά δακτυλίδια και κεντρικό κυματοδηγό. Ο μαγνήτης του είναι νεομυδίου. 

ο ηχείο παρουσιάζει εμπέδηση 6Ω, ελάχιστη 4,5Ω, αντέχει 70W και έχει ευαισθησία 87dB. Το βάρος του είναι 3,6 κιλά.

Project Seven

Dick Sequerra’s Met 7 is unquestionably one of the cornerstones of mini-speakers. Conceptually it is the opposite of LS3 / 5a, and it is like Mr. Hyde to Dr. Jekyl.

Dick Sequerra, known for his tuners Marantz 10 and Sequerra Model 1, began his electro-acoustic adventure in the late 1970s, founding the Pyramid Loudspeaker Co. The first model is the Metronome One (the names Pyramid and Metronome refer to the shape pyramidal and / or metronome of the first models), a 4-way with 15 “woofer, a 6.5″ mid-bass, a 4.5 “mid-high and a 2″ cone tweeter, the whole 90 cm high , with a 65X39 cm base. The second model, from 1977, is the Two + 2W, an “Aztec” pyramid with a lower module (2W, 70X43X63 cm) with a 12 “woofer and an upper 3-way pyramid, independent if desired (Model Two: 8″ woofer) , midrange 4.5 “and 2″ cone tweeter, 31X20X45 cm). The Model Two + 2W is completed by the fabulous T1 ribbon tweeter in ’78, a tweeter so special that it replaced the Decca Ribbon in Mark Levinson’s latest HQD systems, making it HQS. The T1 being very expensive, Dick developed the HF1 ribbon tweeter to meet the demand of many audiophiles, one of the very popular systems of the era was the HF1 + Dahlquist DQ10 system + Janis subwoofer.

In fact, the HF1 cabinet is the “egg” from which the Met 7 is born … In fact, Dick Sequerra, recycling the cabinet of this ribbon tweeter, to create an economical speaker, the Met 7 (5 “woofer and the usual 2 ”tweeter), which by far surpasses the previous Pyramid models in fame. From the Met 7 comes the modular system “Futuresonics” which completes the Met 7 at the bottom and top with the Met 8W subwoofer (12 “woofer) and the Met 9 super tweeters (front / rear double belt) or HF1. The Futuresonics system, in its late 70s version, delight many audiophiles also in Italy, and the Met 7 of that era, used on its own, has qualities well above its price and those who own a pair, rarely if they separates … ..

At the “golden age” almost always dark times follow in the subsequent history of the Met 7. The Met 7 MkII, a 6.5 “woofer and 2″ “sun-blinded” tweeter, has never really convinced the lovers of the “real” Met 7. Similarly, the Futuresonics MkII was questionable (Met 8 MkII woofer, Met 9 MkII horizontal ribbon tweeter and “line source” Met 10).
To criticism Dick responded with the “Signature Model One System”, a $ 28,000 Futuresonics. The midrange module (= Met 7 MkII) loses the cave around the tweeter and buys a Corian cabinet, the tweeter module becomes again a T1 + Met10-4 etc…. Obviously, such a system was not for everyone and was derived from it the NFM-1 nearfield monitor (the central module of the Signature Model One, but with an MDF cabinet instead of the very expensive Corian) for $ 1500.
With the 7.7 MkI model, a Met 7 “comme-il-faut”, a 5 ”woofer and a“ true ”Met 7 dimension is suddenly born again, this is perhaps the best Met 7 ever made, very rare and very cheap (800 USD) . The following versions MkII and MkIII always with a 5 “woofer, which are also” comme-il-faut “, but these additional versions are caused by problems with the supply of the 7.7″ MkI 5 “woofers, rather than by real ones improvements.  
Unfortunately with the 7.7 MkIV we return to a 6.5 “woofer and more important dimensions and in fact we can speak rather of an updated NFM-1, ditto for the Met 7.7MkV … ..
The Metronome 20 opens a new chapter apart, and marks the return to the pre-Met 7 pyramid shape at a much less popular price (5000 USD).

What makes the Met 7 such a special object? 
Sequerra’s electro-acoustic philosophy puts the emphasis on the correct temporal behavior of its diffusers, with much attention to the diffraction phenomena (hence the pyramidal shape of the origins). 
In the case of the Met 7, the front is limited to the dimensions that allow the literally “hair” of the 5 “woofer and the 2″ tweeter, with a “step” power factor correction of the woofer. These truly minimal dimensions of 13.5X19.5X23 cm make falling in love immediate … .. 
The filtering is strictly of the first order “minimum phase”, to respect the wave form of the musical signal to the maximum.
It should be noted that Sequerra uses exclusively cone tweeters (apart from the tapes of course), supporting their superiority over the classic “domes”. It is very difficult to blame him, given the advantages in terms of dispersion control as a function of diffraction thanks to the typical behavior of cones that concentrate radiation, by hand-to-hand which increases the frequency, in the center of the cone, instead of in the periphery (the cones are distinguished by a very low listening effort).

The Caterham Acoustics Seven slavishly incorporates the ingredients of the original Met 7 with only an update of the components (the drivers are direct descendants of those of the origins) with slight improvements in the quality of the wiring and of the capacitors. The cabinet is in MDF instead of the very cheap original chipboard, finished in scratch-resistant Vesmaflex. The system of power signaling LEDs has been eliminated for sound reasons. And an absolutely no-compromise product, despite the low price. And a no-marketing product (a tweeter cone in the 21st century?) And also no-design (small yes, but beautiful?). Like an automotive Caterham Seven, it has only one goal, to give pleasure of “racing” listening, like the driving pleasure of its namesake.

The Caterham Acoustics Seven will give the best to small, inexpensive, integrated audiophiles, like no other speaker in its price range, gracefully managing the color and limits of such electronics. There are no upward limits to transistors or valves (except for an attention to not having excessive powers). Obviously it can be completed with a supertweeter and an “ad-hoc” subwoofer.

Posted under: Aliante (προιόντα), Νέα/Ανακοινώσεις

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