In a nutshell

Nagra IV-S, first designed for stereo music recording, was quickly taken up by movie production. Two-track recording allows to separate boom track from radio mike track, "in" from "off", playback from sync sound, etc. It is then possible to make up for mishaps that may have occurred during recording. Excellent microphone preamps, large dynamic range, high quality filters and limiters, two-needle level display, sturdiness and reliability, great autonomy, all this has made Nagra IV-S number one on production sets, radio studios and concert halls, long after the release of field digital recorders.
The Nagra IV-S has been replaced by DAT for economic reasons: sound dailies must be transferred to DAT in order to maintain TC continuity (mirror DAT); ¼" sound tape cost is three or four times DAT cost. Nevertheless, many American and European sound mixers manage to impose Nagra IV-S on productions in spite of an entirely digital post production chain.
Pilot signal (50/60 Hz), from internal quartz, frequency-modulates a RF carrier laid between the two audio tracks. Pilot signal can therefore be recorded afterwards with no prebias activation and without damage to recorded audio signals.

This product is commonly named:

Nagra IV-S, Nagra IVS, Nagra IV.S, Nagra 4-S, Nagra 4S, Nagra 4.S, IV-S, IVS, IV.S, 4-S, 4S, 4.S

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Technical specifications

2 pistes analogiques sur bande magnétique largeur 6.35 mm, type EMTEC SM468, non réversible. Vitesses (cm/s) : 9.5, 19, 38, 38 NagraMaster. 4 têtes (contrôle après bande), limiteur intégré débrayable. 5 filtres coupe bas différents agissant sur les 2 pistes. Modulomètre (-8 dB mod. = 0 dB VU), générateur de référence 1 kHz.


2 entrées analogiques symétriques niveau micro (48 V. Ph., 12 V. Ph., -12 V. Ph., 10 V. T, Dyn 200 Ohms, Dyn 50 Ohms) XLR3F x 2.
2 entrées analogiques en courant niveau ligne asymétriques, Tuchel 7 pts.


2 sorties ligne asymétriques (Zs > 5 kOhms), bananes x 4.
2 sorties ligne asymétriques (Zs > 5 kOhms), Tuchel 7 pts.
1 sortie casque avec sélecteur d'écoute.

Sync & Time Code

Signal pilote 50 Hz, inscription en MF entre pistes L & R, généré par quartz interne. Appareil synchronisable en lecture (playbacks) sur le quartz interne (QSLS externe) ou sur un signal 1 V./50 Hz externe (ATN).

Power & Dimensions

Alimentation interne par accus NiCd 1.2 V./LR20 (charge par ATN + PAR) ou par 12 piles LR 20 1.5 V. Autonomie en continu env. 7 h. Alimentation secteur externe 110/220 V.AC, réf. ATN II, puissance consommée env. 5 W.
Dimensions 32 cm x 22 cm x 11 cm. Masse 6.4 kg avec piles et bande.

Manufacturer's documents