What’s New: <\/strong><\/p>\n 10 Jan 2019: adding Sony TC-K777 (MK1 – Sendust head), Nakamichi 680ZX, Alpine AL85<\/p>\n 09\u00a0Dec 2017: adding Technics RS-B905, Aiwa Excelia XK-009, Pioneer CT-93, Pioneer CT-S830S charts;<\/p>\n 01\u00a0Oct 2017: adding YAMAHA K-1020\u00a0chart;<\/p>\n 28 Aug 2017: adding TEAC V-7000 chart;<\/p>\n 27 Aug 2017: \u00a0adding a Nakamichi ZX7 chart;<\/p>\n \n<\/blockquote>\n \u00a0 \u00a0T<\/strong>he frequency response of the playback channel is important for sound signature of every cassette deck. The standard was not properly followed on some early cassette decks. The IEC Prague 1981 is the last standard, defined the frequency response of the magnetic flux. Some early Nakamichi decks were very close to the final standard and the Nakamichi did not changed their playback frequency response. Nakamichi noticed the error in the early DIN measurement method used by BASF and Philips. The final effect after the correction on IEC-1981 is that the high frequency recording flux was reduced and the tape does not saturate on low speed. The correction of head loss is made in the playback amplifier. The following measurement were done using standard IEC-1981 test tape. This tape follows the last recommendations for the frequency response of the playback channel.<\/p>\n AIWA\u00a0<\/strong>brand models: Excelia XK-009 AKAI <\/strong>brand models: GX-67, GXC-709D, GX-F91 Alpage & Alpine\u00a0<\/strong>brand models: AL-300, Alpine AL85 Dual\u00a0<\/strong>brand models: C844 Denon\u00a0<\/strong>brand models: DRM-710 Hitachi\u00a0<\/strong>brand models: D5500, D3300M, D-E99 JVC\u00a0<\/strong>brand models: KD-A3 Nakamichi\u00a0<\/strong>brand models: Dragon, ZX7, BX-300E, DR1, DR3, CR-3E, 480, 680ZX Onkyo\u00a0<\/strong>brand models: TA-2350 Pioneer\u00a0<\/strong>brand models: CT-A7, CT-95, CT-93, CT-S830S Sony\u00a0<\/strong>brand models: TC-K55, TC-K790ES, TC-K909ES, TC-K777MK1, TC-K777ES (MKII), TC-KE500S Tandberg\u00a0<\/strong>brand models: TCD-3014A Revox\u00a0<\/strong>brand models:\u00a0B710 MK2 Yamaha\u00a0<\/strong>brand models: KX670, KX1200, K1020 The newly tested Yamaha KX1200 show full compatibility with the current IEC standard. Some of the measurement of the machine are interesting.<\/p>\n We tested the signal to noise ration on the following conditions: reference +4dB=250nWb\/m=550mV (at line out), without using a-weighted filter. The machine shows the following results:<\/p>\n Position Normal (Type I) on play without a tape into the cassette holder:<\/p>\n Position Normal (Type I) with erased Fuji DR:<\/p>\n Position High (Type II – chrome) with erased Quantegy 472:<\/p>\n Note that this readings are based on the criteria of reference level corresponding to 250nWb\/m\u00a0(not to 3% third harmonic distortion), also there is no weighted filter. We also measure the frequency response of the recording chain based on high level (for flat response) and -3 dB at 21kHz. The results show:<\/p>\n Now the same tapes with -3dB roll off at 21kHz:<\/p>\n The measured Wow&Flutter was about 0,035-0,04% WRMS, corresponding to JIS. KX1200 is one of the interesting models, because of its non standard low frequency time constant in PB amp EQ. The standard define 3180uS but this model uses 2700uS. That reduces the boost in the low frequency PB amp, and that fact is due the self low-frequency boost in the amorphous PB head (maybe due to the contour effect). As can be seen, the resulting PB frequency response is flat down to 31Hz. The very low frequency roll off at about 20Hz is compensated in the recording chain, where there is a low frequency boost applied in the chain of the low-frequency filter before the rec-amp buffer.<\/p>\n Teac\u00a0<\/strong>brand models: V-8000S, V-7000, V850 Technics\u00a0<\/strong>brand models: RS-B905, RS-B85,\u00a0RS-B965
\n![\"Aiwa](\"https:\/\/lab2104.tu-plovdiv.bg\/wp-content\/uploads\/2015\/12\/Aiwa-Excelia-XK-009.jpg\")
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