Marantz 4270 stereo receiver

frekvences.
Izskatīšu dažādus man izdevīgus maiņas variantus, tai skaitā pret augstākas klases audio tehniku ar defektiem, kā arī 21. gadsimta skandām. Īpaši interesē Bowers&Wilkins.
Atrodas Valmieras centrā, reizi nedēļā iespējams saņemt Rīgā. Par atsevišķu samaksu varu piegādāt arī citviet Latvijā.
Specene:
Connections

Number of inputs:
Phono: 2.2 mV / 47 kOhm
Aux: 150 mV / 100 kOhm

Tape Play 1, 2: 150 mV / 100 kOhm
Main In:
Number of Outputs:
Tape Rec 1, 2: 1 V / 47 kOhm
Pre-Out: 1 V, 900 Ohm
Headphones 1, 2: (6,3mm jack)
4 speaker pairs

Technical Data

Audio

Output power (at harmonic distortion)
Stereo: 2x 70 W / 0.3 % Quadrophony: 4x 40 W / 0.3 %

Attenuation factor: 45
Frequency response: 7 - 70'000Hz
Signal-to-noise ratio:
Stereo channel separation:
Tone control:
Bass: ±10dB at 50Hz
Mids: ±10dB at 700Hz Treble: ±10dB at 15kHz

Loudness: 7dB at 100Hz, 4dB at 10kHz
High Filter: 10kHz, 6dB per octave
Low Filter: 100Hz, 6dB per octave
Mute: -

Sound Formats

Dolby
DolbyFM

Tuner

Reception: FM, MW
Frequencies:
FM: 88 - 108 MHz
MW: 540 - 1602 kHz

Frequency response: 30 Hz - 15 kHz, ± 1 dB
Input sensitivity: 2.2 µV
Distortion factor: 0.4 % (stereo), 0.3 % (mono)
Signal-to-noise ratio: > 90 dB
Channel separation: greater than 40 dB
selectivity: > 60 dB
Co-wave selection: 70 dB
Spurious wave selection: 90 dB
Image frequency attenuation: 90 dB
IF attenuation: 100 dB
AM suppression: 50 dB

Special Features

Built-in Dolby system
Quadradial Output
2x headphone jack for four channel

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Selling a rare, melodious, and high-performance Marantz Model 4270 receiver, made in Japan in the mid-70s, in excellent condition. It features a rare function that creates an analog virtual surround sound from 4 speakers. The ability to connect up to 4 pairs of speakers (total 8 speakers). Also suitable for tape or cassette recording/playback - it has built-in Dolby playback functionality, as well as a 400Hz test tone. As with Marantz of this era, the tone block allows you to adjust not only bass and treble but also mid frequencies.

I will consider various exchange options favorable to me, including higher-class audio equipment with defects, as well as 21st-century speakers. Particularly interested in Bowers & Wilkins.

Located in the center of Valmiera, can be received in Riga once a week. For an additional fee, I can deliver elsewhere in Latvia.

Specifications:

Connections

Number of inputs:
Phono: 2.2 mV / 47 kOhm
Aux: 150 mV / 100 kOhm

Tape Play 1, 2: 150 mV / 100 kOhm
Main In:
Number of Outputs:
Tape Rec 1, 2: 1 V / 47 kOhm
Pre-Out: 1 V, 900 Ohm
Headphones 1, 2: (6.3mm jack)
4 speaker pairs

Technical Data

Audio

Output power (at harmonic distortion)
Stereo: 2x 70 W / 0.3 % Quadrophony: 4x 40 W / 0.3 %

Attenuation factor: 45
Frequency response: 7 - 70,000 Hz
Signal-to-noise ratio:
Stereo channel separation:
Tone control:
Bass: ±10dB at 50Hz
Mids: ±10dB at 700Hz Treble: ±10dB at 15kHz

Loudness: 7dB at 100Hz, 4dB at 10kHz
High Filter: 10kHz, 6dB per octave
Low Filter: 100Hz, 6dB per octave
Mute: -

Sound Formats

Dolby
DolbyFM

Tuner

Reception: FM, MW
Frequencies:
FM: 88 - 108 MHz
MW: 540 - 1602 kHz

Frequency response: 30 Hz - 15 kHz, ± 1 dB
Input sensitivity: 2.2 µV
Distortion factor: 0.4 % (stereo), 0.3 % (mono)
Signal-to-noise ratio: > 90 dB
Channel separation: greater than 40 dB
Selectivity: > 60 dB
Co-wave selection: 70 dB
Spurious wave selection: 90 dB
Image frequency attenuation: 90 dB
IF attenuation: 100 dB
AM suppression: 50 dB

Special Features

Built-in Dolby system
Quadradial Output
2x headphone jack for four channel