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RESTEK EXTRACT Testbericht in Hifi vision April 1992

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Testbericht der Mono Endstufen RESTEK EXTRACT in der Zeitschrift Hifi Vision vom April 1992

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RESTEK EXTRACT Testbericht in Hifi vision April 1992

  1. 1. ie sehen genauso aus wie ihre riesigen Brüder, die HIFI VISION-Referenz-End- stufen Restek Exponent, sind nur viel kleiner. Tragen die Großen in Anspielung auf den Sitz ihres Herstellers den Spitznamen „Kasseler Ber- ge", so möchte man die Klei- nen sofort „Kasseler Zwerge" taufen. Spaß beiseite, den Hessen ist es mit ihren Newcomern sehr ernst. Deren Name ist Programm: Extract. Sie sollen gleichsam das aufwendige Konzept von Ex- ponent und Extent (Tests in HIFI VISION 4/1990 und 9/1991) eine Ebene tiefer mit gleicher Konsequenz fortset- zen. So besitzt die konzen- trierte Ration ebenfalls die blau erstrahlende Leistungs- anzeige, von einem verchrom- ten, dicken Metallrahmen ein- gefaßt. Wie ihre Vorbilder sind die Extracts als Mono-Blöcke ausgelegt, können also in un- mittelbarer Nähe der Laut- sprecher plaziert werden. Auf seiner Rückseite be- herbergt jeder Verstärker Schalter, die bei Bedarf der Light-Show den Saft abdre- hen, zwischen der Cinch-Buch- se und einem zusätzlichen symmetrischen XLR-Eingang wählen oder den Lautsprecher- Ausgang stillegen. Über ein Potentiometer läßt sich die Empfindlichkeit der Extract auf jede Vorstufe einpegeln. Auch im Innern der small blocks wird deren Verwandt- schaft zu Extent und Expo- nent deutlich. So besitzt jeder einen kräftigen Ringkerntrafo, der stabile Spannungsverhält- nisse auch unter extremer Belastung sicherstellen soll. Um eine gegenseitige Beein- flussung der einzelnen Bau- gruppen auszuschließen, ver- fügen Eingangs-, Steuer-, Trei- ber- und Endstufe über sepa- rate Stromversorgungen. Die
  2. 2. Treiberplatine, die unmittel- bar vor den Leistungstransi- storen sitzt, entspricht in Schaltung und Bestückung praktisch jener der eine Num- mer größeren Extent. Signale verstärkt die End- stufe mit bis zu 248 Watt Dau- erleistung an vier Ohm. In der kleinen Brust der Extract schlägt also ein kräftiges Herz, das auch wirkungsgradschwa- che Boxen ausreichend mit Saft versorgt. Im Falle einer Übersteuerung zeigt die rote „Peak"-Leuchte auf der Front an, daß es jetzt genug ist. Der Lautstärke-Abstand zwischen der Dauerleistung und selbsterzeugtem Rau- schen und Brummen beträgt 72 Dezibel, ein Wert, der störungsfreie leise Passagen garantiert. Die relativ geringe Eingangsempfindlichkeit von 2,2 Volt für Vollausteuerung wurde von Restek absichtlich so niedrig gewählt, um etwai- ges Eigenrauschen des Vorver- stärkers unterhalb der Hör- schwelle zu halten. Dessen Lautstärkeregler muß einfach nur etwas weiter aufgedreht werden als im Verbund mit sensibleren Endstufen. Auf dem rückwärtigen Bedienfeld befinden sich neben dem Cinch- und XLR-Eingang auch Schalter, die das Display ver- dunkeln, den Lautsprecher-Ausgang lahmlegen oder die Ein- schaltautomatik aktivieren, sowie ein Eingangspegelregler Das Innere der Extract ist mit hochwertiger Elektronik geradezu vollgestopft. Eingangs-, Steuer-, Treiber- und Endstufe besitzen separate Stromversorgungen Im Hörraum übernahm der vom Naim CD-Spieler NA CDS/NA CDP angefeuerte Burmester-Vorverstärker 808 MK 3 diese Aufgabe, während die T230 der westfälischen Boxenschmiede T+A den Ein- satz der Extract zu Gehör brachte. „Typisch Restek", lautete der spontane Kom- mentar eines Zuhörers, und das war ganz und gar nicht ab- fällig gemeint. Denn die Ex- tract verfügt über Klang-Tu- genden, die bereits den groß- spurigen Typen Extent und vor allem Exponent die Sym- pathien der Redakteure si- cherten. Auffälliges Markenzeichen des musikalischen Extract- Angebots war sein forsches Auftreten. Vor schwierigen Aufgaben, etwa dem komple- xen ersten Titel aus Thom Ro- tellas CD „Without Words", schreckten die Glimmer-Twins nicht zurück. Dessen Sound- menü aus tiefen, straffen Bäs- sen, knallhartem Schlagzeug, quirliger Gitarre und allerlei feinen Details als Würze be- reiteten Resteks kleine Qua- der ausgesprochen schmack- haft auf. Im Vergleich zur wirklich prima klingenden Rotel RHB- 10 (Test in HIFI VISION 2/1991, Referenz in der Ober- klasse) wirkten die Kasseler noch aufgeweckter und staffel- ten Instrumente besser in der Tiefe. Gerade wenn die Harry James Big Band ihr „Corner Pocket" anstimmte, erschien die Rotel-Darbietung etwas flach, gleichzeitig aber tonal sehr geschlossen, während die Extract besonders in den obe- ren Mitten zu einer helleren Abbildung neigte. Besonders Stimmen wurden dadurch mit einem leicht kühlen Hauch versehen. Gegen die Project Four- teen von Sphinx, die eine Klas- se höher residiert, schlugen sich die Resteks ebenfalls sehr wacker. Konnten sie in puncto Dynamik, Straffheit, Spritzig- keit und räumlicher Abbil- dung mit dem ungleich teure- ren Konkurrenten gleichzie- hen oder ihn teilweise sogar übertrumpfen, arbeitete die Sphinx einfach lässiger und verströmte dadurch den Ein- druck genau jener Souverä- nität, die Spitzen-Endverstär- ker auszeichnet. Aus diesem Grund ent- schloß sich HIFI VISION, der Restek Extract den alleinigen Referenzstatus in der Ober- klasse zu gewähren - quasi nur noch einen winzigen Schritt von der nächsten Stufe ent- fernt. Und im Clan der Restek- Boliden hat die kleine Extract ein gewichtiges Wörtchen mit- zureden. Matthias Böde

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