Difference between revisions of "Harman/kardon HD 7725"
 
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__NOTOC__
 
__NOTOC__
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== Daten ==
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== Data ==
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{{Navigation}}
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{{navigation}}
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'''Allgemein'''
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'''General'''
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* Hersteller: [[Harman/kardon]]
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* Manufacturer: [[Harman/kardon]]
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* Modell: HD 7725
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* Model: HD 7725
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* Typ: CD-Player
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* Type: CD-Player
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* Baujahre: 1995 - 1998
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* Years of manufacture: 1995 - 1998
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* Farbe: Schwarz
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* Color: Black
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* Fernbedienung: ja
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* Remote control: yes
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* Abmessungen: 443 x 103 x 326 mm (BxHxT)
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* Dimensions: 443 x 103 x 326 mm (WxHxD)
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* Gewicht: 8,6 kg
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* Weight: 8,6 kg
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* Neupreis ca.: 2'099 DM
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* Original price approx.: 1'999 DM
  
  
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'''Anschlüsse'''
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'''Connections'''
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* Ausgänge:  
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* Outputs:  
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** 2 x Cinch (1 x fix, 1 x variabel)
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** 2 x Cinch (1 x fixed, 1 x variable)
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** 1 x Digital Koaxial
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1 x Digital Coaxial
 
** 1 x Digital Toslink (SPDIF)
 
** 1 x Digital Toslink (SPDIF)
  
  
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'''Technische Daten'''
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'''Technical Data'''
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* Frequenzgang: 2 Hz - 20 kHz
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* Frequency response: 2 Hz - 20 kHz
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* Verzerrung: 0,0025%
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* Distortion: 0,0025%
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* Dynamikbereich: 98 dB
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* Dynamic range: 98 dB
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* Rauschabstand: 104 dB
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* Signal to noise ratio: 104 dB
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* Kanaltrennung: 98 dB
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* Channel separation: 98 dB
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* Ausgangsspannung: 2,1 V
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* Output voltage: 2.1 V
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* Ausgangswiderstand: 150 Ohm (fix); 1250 Ohm (variabel).
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* Output impedance: 150 ohms (fixed); 1250 ohms (variable).
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* Fehlerkorrektur: CIRC-System, mäßige Fehlerkorrektur laut Test im Stereoplay 4/93.
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* Error correction: CIRC system, moderate error correction according to test in Stereoplay 4/93.
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* Verstärktes Chassis, Fernbedienung.
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* Amplified chassis, remote control.
  
  
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* Weitere Daten bei "Hifi-Engine": [[https://www.hifiengine.com/manual_library/harman-kardon/hd7725.shtml]]
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* Further data at "Hifi-Engine": [[https://www.hifiengine.com/manual_library/harman-kardon/hd7725.shtml]]
  
  
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'''Besonderheiten'''
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'''Special Features'''
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* Fernbedienung
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* Remote control
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* Verstärktes und gedämpftes Gehäuse
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* Reinforced and damped housing
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* Sony Laufwerk
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* Sony drive
 
* Laser: KSS 210A
 
* Laser: KSS 210A
  
  
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== Bemerkungen ==
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== Comments ==
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* Weitere Modelle der gleichen Serie:
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* Other models in the same series:
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* A/V-Vorverstärker:
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* Preamplifier:
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* [[Harman/kardon Signature 2.0]]
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* [[Harman/kardon AP 2500 Signature Series]]
  
  
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* Endverstärker:
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* Power amplifiers:
 
* [[Harman/kardon PA 2100]]
 
* [[Harman/kardon PA 2100]]
 
* [[Harman/kardon PA 2200]]
 
* [[Harman/kardon PA 2200]]
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* Vollverstärker:
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* [[Integrated Amplifier]]
 
* [[Harman/kardon HK 610]]
 
* [[Harman/kardon HK 610]]
 
* [[Harman/kardon HK 620]]
 
* [[Harman/kardon HK 620]]
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* [[Harman/kardon HK 660]]
 
* [[Harman/kardon HK 660]]
 
* [[Harman/kardon HK 680]]
 
* [[Harman/kardon HK 680]]
 +
* [[Harman/kardon HK 1200]]
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* [[Harman/kardon HK 1400]]
  
  
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* A/V-Vollverstärker:
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* [[A/V integrated amplifier]]
 +
* [[Harman/kardon AVI 100]]
 
* [[Harman/kardon AVI 150]]
 
* [[Harman/kardon AVI 150]]
 
* [[Harman/kardon AVI 200 II]]
 
* [[Harman/kardon AVI 200 II]]
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* [[Harman/kardon AVI 250]]
 
  
  
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* Tuner:
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* [[Tuner]]
 
* [[Harman/kardon TU 930]]
 
* [[Harman/kardon TU 930]]
 
* [[Harman/kardon TU 950]]
 
* [[Harman/kardon TU 950]]
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* Receiver:
 
* Receiver:
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* [[Harman/Kardon HK 3250]]
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* [[Harman/kardon HK 3250]]
  
  
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* A/V-Receiver:
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* A/V receivers:
 
* [[Harman/kardon AVR 10]]
 
* [[Harman/kardon AVR 10]]
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* [[Harman/kardon AVR 11]]
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* [[Harman/kardon AVR 21]]
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* [[Harman/kardon AVR 25 II]]
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* [[Harman/kardon AVR 25]]
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* [[Harman/kardon AVR 41]]
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* [[Harman/kardon AVR 70]]
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* [[Harman/kardon AVR 51]]
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* [[Harman/kardon AVR 80]]
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* [[Harman/kardon AVR 75]]
 
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* [[Harman/kardon AVR 85]]
 
  
  
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* CD-Player:
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* CD player:
 
* [[Harman/kardon HD 710]]
 
* [[Harman/kardon HD 710]]
 
* [[Harman/kardon HD 730]]
 
* [[Harman/kardon HD 730]]
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* [[Harman/kardon HD 7625]
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* [[Harman/kardon HD 7625]]
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* [[Harman/kardon HD 7725]
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* [[Harman/kardon HD 7725]]
  
  
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* CD-Wechsler:
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* [[CD Changer]]
 
* [[Harman/kardon FL 8300]]
 
* [[Harman/kardon FL 8300]]
  
  
 
* Tape Deck:
 
* Tape Deck:
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* [[Harman/kardon TD 420]]
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* [[harman/kardon TD 420]]
 
* [[harman/kardon TD 450]]
 
* [[harman/kardon TD 450]]
 
* [[harman/kardon TD 470]]
 
* [[harman/kardon TD 470]]
  
  
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== Bilder ==
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== Pictures ==
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* Auszug aus Prospekt: Harman/kardon HD 7725
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* Extract from brochure: Harman/kardon HD 7725
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[[Datei:Harman Kardon HD-7725-Prospekt-1997.jpg]]
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[[File:Harman Kardon HD-7725-Prospekt-1997.jpg]]
  
  
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== Berichte ==
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== Reports ==
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* Bericht in "Stereoplay 4 / 1993: Absolute Spitzenklasse I
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* Report in "Stereoplay 4 / 1993: Absolute top class I
  
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* Bericht in "Hifi Vision" 10 / 1993: sehr gut
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* Report in "Hifi Vision" 10 / 1993: very good
  
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* Bericht in "Stereo 11 / 1993: homogen farbiges Klangbild
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* Report in "Stereo 11 / 1993: homogeneously coloured sound image
  
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* Bericht in "Hifi Test" 1 / 1995: Testsieger sehr gut
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* Report in "Hifi Test" 1 / 1995: test winner very good
  
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+
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* Das Flaggschiff von [[Harman/Kardon]] von 1993. Aufwändig aufgebauter CD-Player.
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* The flagship of [[Harman/Kardon]] from 1993. Elaborately built CD player.
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* Er besitzt ein Antiverzerrungskonzept RLS (Real Time Linear Smoothing), das den Datenstrom auf zwei 18-bit-Wandler (PCM 61 K) pro Kanal aufteilt, einer erhält ihn um einen Abtastwert zeitversetzt. Beim Burr-Brown-Wandler handelt es sich um einen R2R-Wandler, dessen am IC-Pin anliegender Stromausgang bei der im HD7725 verwendeten Burr-Brown-Standardbschaltung direkt an den PIN des internen Operationsverstärkers zurückgespeist wird. Das durch die DAC-internen OPs spannungsgewandelte Differenzsignal beider Konverter spiegelt den Verlauf der Ausgangskurve wider. Damit speiste Harman einen Kondensator, der seine Spannung nicht sprunghaft, sondern nur stetig ändern kann und somit das treppenförmige Wandler-Ausgangssignal glättet, sprich, das Signal entspricht schon fast exakt dem Musiksignal. * Nach den Wandler steht eine aufwendige Summier Doppel-Differenzialverstärkerstufe, die diskret mit Einzeltransistoren aufgebaut ist. Beide Ausgänge, für den fixen und den variablen, sind diskret mit Einzeltransistoren aufgebaut. Ausgangskoppelkondensatoren haben 220 uF/25V (Panasonic "Pureism").
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* It has an anti-distortion concept RLS (Real Time Linear Smoothing), which splits the data stream to two 18-bit converters (PCM 61 K) per channel, one receives it time-shifted by one sample. The Burr-Brown converter is an R2R converter whose current output applied to the IC pin is fed back directly to the PIN of the internal operational amplifier in the standard Burr-Brown circuitry used in the HD7725. The differential signal of both converters, voltage-converted by the DAC's internal op-amps, mirrors the output waveform. Thus Harman fed a capacitor, which cannot change its voltage abruptly, but only steadily and thus smoothes the staircase-shaped converter output signal, i.e. the signal already corresponds almost exactly to the music signal. * After the converters there is an elaborate summing double differential amplifier stage, discretely constructed with single transistors. Both outputs, for the fixed and the variable, are discretely built with single transistors. Output coupling capacitors have 220 uF/25V (Panasonic "Pureism").
  
  
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* Allgemeine Daten:
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* General data:
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* Dual 18-bit linear Burr Brown DA/Wandler (PCM61K) pro Kanal in höchster (K) Selektion, Real Time Linear Smoothing (RLS) Technik (vermutlich die erste Generation), Abgriff des Spannungsausgangs am Wandler-IC.
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* Dual 18-bit linear Burr Brown DA/converters (PCM61K) per channel in highest (K) selection, Real Time Linear Smoothing (RLS) technique (presumably first generation), tap of voltage output at converter IC.
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* Diskret aufgebaute Ausgangsstufe für den fixen und variablen Chinch-Ausgang.
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* Discretely built output stage for fixed and variable RCA output.
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* Differenzialverstärker diskret aufgebaut!
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* Differential amplifier discretely built!
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* Diskret, getrennt für den Digital- und Analogbereich, aufgebaute Stromversorgung!
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Discrete, separate power supply for the digital and analogue range!
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* Regelbarer Kopfhörerverstärker, dieser hat einen Dual OPV NJM4565 verbaut.
+
Adjustable headphone amplifier, this has a dual OPV NJM4565 built in.
  
  
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[[Kategorie:CD-Player]]
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[[Category:CD Player]]

Latest revision as of 05:52, 22 June 2020

Data[edit]

General

  • Manufacturer: Harman/kardon
  • Model: HD 7725
  • Type: CD-Player
  • Years of manufacture: 1995 - 1998
  • Color: Black
  • Remote control: yes
  • Dimensions: 443 x 103 x 326 mm (WxHxD)
  • Weight: 8,6 kg
  • Original price approx.: 1'999 DM


Connections

  • Outputs:
    • 2 x Cinch (1 x fixed, 1 x variable)

1 x Digital Coaxial

    • 1 x Digital Toslink (SPDIF)


Technical Data

  • Frequency response: 2 Hz - 20 kHz
  • Distortion: 0,0025%
  • Dynamic range: 98 dB
  • Signal to noise ratio: 104 dB
  • Channel separation: 98 dB
  • Output voltage: 2.1 V
  • Output impedance: 150 ohms (fixed); 1250 ohms (variable).
  • Error correction: CIRC system, moderate error correction according to test in Stereoplay 4/93.
  • Amplified chassis, remote control.


  • Further data at "Hifi-Engine": [[1]]


Special Features

  • Remote control
  • Reinforced and damped housing
  • Sony drive
  • Laser: KSS 210A


Comments[edit]











Pictures[edit]

  • Extract from brochure: Harman/kardon HD 7725

Harman Kardon HD-7725-Prospekt-1997.jpg


Reports[edit]

  • Report in "Stereoplay 4 / 1993: Absolute top class I
  • Report in "Hifi Vision" 10 / 1993: very good
  • Report in "Stereo 11 / 1993: homogeneously coloured sound image
  • Report in "Hifi Test" 1 / 1995: test winner very good


  • The flagship of Harman/Kardon from 1993. Elaborately built CD player.
  • It has an anti-distortion concept RLS (Real Time Linear Smoothing), which splits the data stream to two 18-bit converters (PCM 61 K) per channel, one receives it time-shifted by one sample. The Burr-Brown converter is an R2R converter whose current output applied to the IC pin is fed back directly to the PIN of the internal operational amplifier in the standard Burr-Brown circuitry used in the HD7725. The differential signal of both converters, voltage-converted by the DAC's internal op-amps, mirrors the output waveform. Thus Harman fed a capacitor, which cannot change its voltage abruptly, but only steadily and thus smoothes the staircase-shaped converter output signal, i.e. the signal already corresponds almost exactly to the music signal. * After the converters there is an elaborate summing double differential amplifier stage, discretely constructed with single transistors. Both outputs, for the fixed and the variable, are discretely built with single transistors. Output coupling capacitors have 220 uF/25V (Panasonic "Pureism").


  • General data:
  • Dual 18-bit linear Burr Brown DA/converters (PCM61K) per channel in highest (K) selection, Real Time Linear Smoothing (RLS) technique (presumably first generation), tap of voltage output at converter IC.
  • Discretely built output stage for fixed and variable RCA output.
  • Differential amplifier discretely built!

Discrete, separate power supply for the digital and analogue range! Adjustable headphone amplifier, this has a dual OPV NJM4565 built in.


Links[edit]

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