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The MPX filter eliminates remnants of the 19-kHz stereo carrier and 38-kHz subcarrier signals which may impair the operation of the Dolby NR system. Be sure to turn on the DOLBY NR switch since the MPX filter will not function otherwise. Monitoring the Recorded Sound Monitoring the Recorded Sound As this unit has three separate heads for recording, playback and erasure, you can check the quality of a recorded sound by comparing it with the input source signal. To listen to the input source signal, press the MONITOR button to turn on the SOURCE indicator. To listen to the sound recorded on the tape, press the MONITOR button to turn on the TAPE indicator. Comparing the recorded sound with the sound source While recording, use this monitoring function to check that there is no distortion due to excessive level settings or sound degradation due to head contamination. MONITOR setting Signal flow SOURCE Band Playback head Recording head SOURCE The source signal can be monitored. REC LEVEL TAPE MONITOR LINE IN LINE OUT HEADPHONES TAPE Band Playback head Recording head The recorded signal can be monitored. REC LEVEL MONITOR SOURCE LINE OUT LINE IN HEADPHONESTAPE What Is the Dolby HX PRO System? The Dolby HX PRO system provides precise bias control during recording to reduce distortion and improve linearity in the high-frequency range. The result is recorded sound that is highly faithful to the original. Since the HX PRO system operates only during recording, the same high- quality sound is produced even during playback on other tape decks. The HX PRO system is independent from the Dolby NR system and is unaffected by the Dolby NR setting. Calibrating the Bias Current and Recording Level Although the ATS (Automatic Tape Selection) system in Follow the procedure below to calibrate the bias current and your unit sets the appropriate equalization characteristics recording level. and bias current for each tape type, you may be able to obtain even better results by doing the bias current and recording level calibration function described below. Adjusts the recording level within a range of about ±3 dB Adjusts the bias current within a range of about ±20 % BIAS – + CALIBRATION REC LEVEL – + 1 Insert a cassette with the side to be recorded facing outward. 13 2 4 5POWER >ON BALANCE L R • CALIBRATION COUNTER RESET MEMORY PAUSE P REC MUTE R REC rp 0 · ) 0 AMS ) MPX FILTER ON OFFO o REC LEVEL 0 1 2 3 4 5 6 7 8 9 10 • • • • •• • • • • OFF DOLBY NR B C • • • MONITOR •S POWER REC LEVEL – + • BIAS – + • HEADPHONES § EJECT § EJECT COUNTER RESET MEMORY PAUSE P REC MUTE R REC rp 0 · ) 0 AMS ) MPX FILTER ON OFFO o OFF DOLBY NR B C • • • MONITOR •S POWER BIAS – + • § EJECT CALIBRATION REC LEVEL – + • 2 • • 2 Press CALIBRATION. The peak level meters for adjusting the bias and recording level appear in the display window. CALIBRATION 3 Press r , then P or · to turn on the recording test tones. Notes •You cannot monitor the sound during the calibration operation. •It takes 2 to 3 seconds for the test tone level to stabilize. v or Playback level for a 400-Hz signal Playback level for an 8-kHz signal v REC r PAUSE P · TYPE L H REC CAL 9 9 Bias calibration Choosing the proper bias current for a tape ensures minimum distortion and flat frequency response. Lowering the bias current boosts high-frequency response, but also results in higher distortion. Raising the bias, on the other hand, reduces distortion, but also dampens high-frequency response. You thus obtain proper bias when the bias current and high-frequency response are well balanced. BIAS Bias Bias reduced increased (high-–+ (high frequency frequency Bias reduced (.) Bias increased (+)Outputlevel in dB Frequency in Hz response response boosted) suppressed) •By changing the bias, you can tailor the response to your liking, for example by slightly emphasizing the upper or lower end. •The frequency response of metal tape is much less affected by changes in the bias current than other tape types, and in some cases is uneffected. The adjustment range of this deck (about ±20 %) may therefore not be wide enough to allow adjustment for all tapes. Recording level calibration Even when the recording level is adjusted correctly, a tape with low sensitivity will result in a low playback level. The REC LEVEL calibration control allows you to compensate for sensitivity differences among tapes to equalize both recording and playback levels. This is especially important when using the Dolby NR system, since the system is most effective when recording and playback levels are the same. Inserting a Blank Space During Recording — Record Muting 4 Adjust BIAS until both meters indicate equal playback levels. A low reading on the upper meter indicates a high bias current. A high reading on the upper meter indicates a low bias current. An equal reading on both meters indicates the proper bias current condition. v v TYPE L H REC CAL 9 9 TYPE L H REC CAL 9 9 BIAS – + BIAS – + TYPE L H REC CAL 9 9 The bias cur...