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70
840W har en kontrolbusindgang/-udgang, der
giver forstærkeren mulighed for elektrisk at
modtage umodulerede kommandoer fra
fjernbetjeningen (positiv logik, TTL-niveau) og
loope dem til en anden enhed efter behov. Disse
styringskommandoer genereres typisk af systemer med
specialinstallationer (flerrumssystemer) eller IR-fjernmodtagersystemer.
Kontrolbusstikkene har farvekoden orange.
Der er endvidere indbygget en IR-emitterindgang, så modulerede IR-
fjernbetjeningskommandoer kan modtages elektrisk af forstærkeren.
Kommandoer på denne indgang betjener kun forstærkeren og loopes
ikke demoduleret via kontrolbusudgangen.
Derudover reagerer enheden på ‘direkte’ IR-styringskoder samt
skiftekoder til visse funktioner for at forenkle programmeringen af
systemer med specialinstallationer. Specielle direkte On/Off- og Mute-
kommandoer er tilgængelige via 840E-forforstærkerens fjernbetjening
og bruges til indlæring i C.I.-systemer på følgende måde:
1. Tryk på knappen Standby/On, og hold den nede. Fjernbetjeningen
genererer først standby-kommandoen (skift). Hold knappen nede.
Efter 12 sekunder genereres en 'forstærker On'-kommando. Hvis
knappen holdes nede i yderligere 12 sekunder, genereres en
'forstærker Off'-kommando.
2. Tryk på knappen Mute, og hold den nede. Fjernbetjeningen genererer
først mute-kommandoen (skift). Hold knappen nede. Efter 12
sekunder genereres en 'mute On'-kommando. Hvis knappen holdes
nede i yderligere 12 sekunder, genereres en 'mute Off'-kommando.
Disse kommandoer genkendes af 840W-enheden via IR-
emitterindgangen.
En komplet kodetabel til dette produkt findes på Cambridge Audios
website:
www.cambridge-audio.com
Anvendelse af specialinstallationer
(Custom Installation – C.I.)
IR Emitter
In In Out
Control Bus
Effekt – Stereo/Mono 200 W pr. kanal 8 ohm
350 W pr. kanal 4 ohm
Effekt – Bridged Mono 500 W 8 ohm
800 W 4 ohm
THD (uvægtet) < 0,001 % @ 1 kHz
< 0,005 % 20 Hz – 20kHz
Frekvensgang 5 Hz – 80 kHz -1dB
Signal/støjforhold (ref 1 W/8 ohm) > 90 dB (uvægtet)
Følsomhed Stereo eller Mono =
(ved 200 W 8 ohm) 1,5 V omdr./sek. ubalanceret
1,5 + 1,5 V omdr./min. balanceret
Bridged Mono =
0,775 V omdr./sek. ubalanceret
0,775 V + 0,775V omdr./sek. balanceret
Input-impedans Balanceret input 38 kOhm
Ubalanceret input 68 kOhm
Dæmpningsfaktor > 125 ved 1 kHz
Trigger In 5-12 V AC eller DC
Trigger Out 12 V DC, 100 mA
Strømforbrug Maksimalt 2400 W
Aktiv (intet signal) < 180 W
Standby < 5 W
Dimensioner (H x B x D) 148 x 430 x 365 mm
(5,8 x 16,9 x 14,4”)
Vægt 19,1 kg
Tekniske specifikationer
10


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