Le CEC c'est la communication entre les appareils. C'est ce qui permet que tous les appareils s’éteignent en même temps quand tu en éteins 1, ou le fait de contrôler tous les appareils avec une seule télécommande. L'ARC marche parfaitement, mais on ne peut pas contrôler le volume de l'ampli avec la télécommande de la TV...SuperLumberjack wrote:Le CEC, c'est à dire tout ce qui a un rapport avec l'ARC aussi ?
Cambridge Audio 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
-
- Posts: 17357
- Joined: Fri Jan 05, 2024 4:00 pm
Re: Camridge 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
-
- Posts: 17357
- Joined: Fri Jan 05, 2024 4:00 pm
Re: Camridge 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
Je vois ce que tu veux dire, j'ai aussi un ampli à lampe de 2 x60 WJazzmaster wrote:Après les réponses sur l'association avec l'Oppo je suis très tenté, ce qui me ralentit un peu c'est la crainte de manquer de puissance comparé à mon système stéréo.
Mon ampli à lampe fait 60W mais si c'est comme en guitare, le 60W lampe c'est autrement plus puissant que le 60W transistor.
Donc est ce que je n'aurai pas intérêt à prendre une gamme supérieure comme l'Arcam avr 400?

En tout cas, ce qui est certain, c'est que les 60 W du Cambridge 551R n'ont rien, mais alors strictement rien à voir avec la puissance annoncée par les fabricants comme Onkyo, Yamaha, Pioneer, Denon et autres. D'ailleurs c'est bien dans un sens car Cambridge ne ment pas à ses clients potentiels, mais d'un autre côté les gens sont tellement mal habitués avec les annonces de puissance des autres fabricants que du coup pas mal de personnes n'iront pas vers ce 551R par peur de manque de puissance.
Bon, je sais, dans ton cas, tu le sais déjà

Cependant, je pense tout de même me diriger plus vers le 751R pour avoir tout de même un peu plus d'aisance au niveau amplification (pour la "respiration" du son) et en espérant que les DAC gèrent le DSD, mais l'attente est longue...
D'ailleurs, est-ce que quelqu'un sait quelle est la signature des DACs du 751R ?
-
- Posts: 190
- Joined: Mon Jul 16, 2012 8:56 am
Re: Camridge 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
Ca devait pas etre des Wolfson sur le 751 ?
Bon sinon ce matin, j'ai eu un bon plan pour prendre un 551R en remplacement de mon 540Rv3 qui fonctionne tjs très bien.
790 euros pour un modèle d'expo, c'était pas mal. Mais finalement, je l'ai pas pris, car finalement, il y a assez peu de fonctionnalités en plus sur le 551R, mis à part un petit gain en puissance et la gestion native des formats HD. J'utilise donc tjs les entrées analogiques du Cambridge avec les sorties analogiques de l'Oppo 93.
800 euros pour avoir simplement la HD en plus, ca faisait un poil chero. J'attendrai donc qques temps, pour avoir un ampli qui apporte davantage en terme de fonctionnalités ou en qualité. Bon ca risque de me couter cher remarquez
En tout cas, j'attends aussi le 751 (ou plutot le 651 car pas trop besoin de puissance).
A -30dB sur le mien, j'ai une sensation d'immersion très forte, avec pour un BR de concert par exemple, la vraie sensation d'être en conditions d'écoute dans un concert avec des bouchons filtrants. Au delà, j'atteins un seuil douloureux.
Bon sinon ce matin, j'ai eu un bon plan pour prendre un 551R en remplacement de mon 540Rv3 qui fonctionne tjs très bien.
790 euros pour un modèle d'expo, c'était pas mal. Mais finalement, je l'ai pas pris, car finalement, il y a assez peu de fonctionnalités en plus sur le 551R, mis à part un petit gain en puissance et la gestion native des formats HD. J'utilise donc tjs les entrées analogiques du Cambridge avec les sorties analogiques de l'Oppo 93.
800 euros pour avoir simplement la HD en plus, ca faisait un poil chero. J'attendrai donc qques temps, pour avoir un ampli qui apporte davantage en terme de fonctionnalités ou en qualité. Bon ca risque de me couter cher remarquez

En tout cas, j'attends aussi le 751 (ou plutot le 651 car pas trop besoin de puissance).
A -30dB sur le mien, j'ai une sensation d'immersion très forte, avec pour un BR de concert par exemple, la vraie sensation d'être en conditions d'écoute dans un concert avec des bouchons filtrants. Au delà, j'atteins un seuil douloureux.
-
- Posts: 17357
- Joined: Fri Jan 05, 2024 4:00 pm
Re: Camridge 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
Il me semble oui, c'est d'ailleurs en grande partie pour ça qu'il me tarde d'écouter cet ampli, mais je ne retrouve plus où j'ai vu cette info ....scanlan75018 wrote:Ca devait pas etre des Wolfson sur le 751 ?
-
- Posts: 190
- Joined: Mon Jul 16, 2012 8:56 am
Re: Camridge 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
Pompé sur les tarifs NL
651R
Azur
150 watts RMS (6 ohms, 2 kanalen belast) binnenkort leverbaar
4 HDMI in, 2 uit, 3D TV Deep colour pass-thru and ARC
Video scaling tot 1080p met Anchor Bay ABT2010
Texas Instruments Dual DSP
Audyssey setup, 2EQ. en dynamisch Volumebeheer
Powered Zone 2
IR emitter in and 12v trigger in/out
Hoogwaardige Audiofiele AV receiver uitsluitend in zwart
751R
2 x 200 Watt 6 Ohm, 2 x 140W 8 Ohm, binnenkort leverbaar
7 x 120W 8 Ohm
6 HDMI in (1 op frontpaneel), 2 uit met 3D TV support
Deep colour pass-thru and ARC
24/96 USB audio ingang
Anagram Technologies audio upsampling to 24-bit/192kHz
Voll. video scaling tot 1080p using Anchor Bay ABT2010
Audyssey setup, 2EQ. and Dynamisch Volumebeheer
Powered Zone 2
IR emitter in and 12v trigger in/out
The ultieme audiofiele AV receiver uitsluitend in zwart leverbaar
Donc finalement, entre le 651 et le 751, ca ne serait pas qu'une affaire de puissance.
Ils parlent de DSP Texas Instrument sur le 651 et pas sur le 751
Ce qui est "inquiétant", c'est que quand c'est du Wolfson comme sur le 751BD, c'est mentionné dans la description
651R
Azur
150 watts RMS (6 ohms, 2 kanalen belast) binnenkort leverbaar
4 HDMI in, 2 uit, 3D TV Deep colour pass-thru and ARC
Video scaling tot 1080p met Anchor Bay ABT2010
Texas Instruments Dual DSP
Audyssey setup, 2EQ. en dynamisch Volumebeheer
Powered Zone 2
IR emitter in and 12v trigger in/out
Hoogwaardige Audiofiele AV receiver uitsluitend in zwart
751R
2 x 200 Watt 6 Ohm, 2 x 140W 8 Ohm, binnenkort leverbaar
7 x 120W 8 Ohm
6 HDMI in (1 op frontpaneel), 2 uit met 3D TV support
Deep colour pass-thru and ARC
24/96 USB audio ingang
Anagram Technologies audio upsampling to 24-bit/192kHz
Voll. video scaling tot 1080p using Anchor Bay ABT2010
Audyssey setup, 2EQ. and Dynamisch Volumebeheer
Powered Zone 2
IR emitter in and 12v trigger in/out
The ultieme audiofiele AV receiver uitsluitend in zwart leverbaar
Donc finalement, entre le 651 et le 751, ca ne serait pas qu'une affaire de puissance.
Ils parlent de DSP Texas Instrument sur le 651 et pas sur le 751
Ce qui est "inquiétant", c'est que quand c'est du Wolfson comme sur le 751BD, c'est mentionné dans la description
-
- Posts: 190
- Joined: Mon Jul 16, 2012 8:56 am
Re: Camridge 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
l'importateur slovaque donne plus de précisions ;
651R
• 7.1 AVR, 2x150W HiFi @ 6Ohm
• 4 HDMI 1.4 in, 2 out (3DTV/ARC/...)
október '12 • AnchorBay ABT2010 video scaling
• Texas Instruments Dual DSP
• Audyssey 2EQ, Zone 2, IR in/out, 2xDO
• ?ierne AL prevedenie
751R
• 7.1 AVR, 2x200W HiFi @ 6Ohm
• 6 HDMI 1.4 in, 2 out (3DTV/ARC/...)
október '12 • ABT2010+TI Dual DSP+ADI Sharc DSP
• Q5 24bit/192kHz upsampling, USB 24/96
• Audyssey 2EQ, Zone 2, IR in/out, 2xDO
• ?ierne AL prevedenie
http://www.imageaudio.sk/subory/pdf/cen ... eAudio.pdf
Pas de Wolfson a priori donc je pense. Qqn connait TI Dual DSP+ADI Sharc DSP ? Bon TI, y a surement de toutes les gammes, ADI, je connais pas
651R
• 7.1 AVR, 2x150W HiFi @ 6Ohm
• 4 HDMI 1.4 in, 2 out (3DTV/ARC/...)
október '12 • AnchorBay ABT2010 video scaling
• Texas Instruments Dual DSP
• Audyssey 2EQ, Zone 2, IR in/out, 2xDO
• ?ierne AL prevedenie
751R
• 7.1 AVR, 2x200W HiFi @ 6Ohm
• 6 HDMI 1.4 in, 2 out (3DTV/ARC/...)
október '12 • ABT2010+TI Dual DSP+ADI Sharc DSP
• Q5 24bit/192kHz upsampling, USB 24/96
• Audyssey 2EQ, Zone 2, IR in/out, 2xDO
• ?ierne AL prevedenie
http://www.imageaudio.sk/subory/pdf/cen ... eAudio.pdf
Pas de Wolfson a priori donc je pense. Qqn connait TI Dual DSP+ADI Sharc DSP ? Bon TI, y a surement de toutes les gammes, ADI, je connais pas
-
- Posts: 17357
- Joined: Fri Jan 05, 2024 4:00 pm
Re: Camridge 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
C'est marrant de voir aussi que l'Audyssey 2EQ est proposé en lieu et place du CAMCAS propriétaire. Ça en dit long sur l'efficacité de ce dernier....
-
- Posts: 190
- Joined: Mon Jul 16, 2012 8:56 am
Re: Camridge 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
J'ai l'impression que le prix du 551R va un peu baisser avec l'arrivée des grands frères.
Bon faudra attendre les tests, surement de très belles bêtes, mais c'est quand même un poil cher.
Bon faudra attendre les tests, surement de très belles bêtes, mais c'est quand même un poil cher.
-
- Posts: 17357
- Joined: Fri Jan 05, 2024 4:00 pm
Re: Camridge 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
Les DSP Sharc sont assez réputés et intégrés dans quelques appareils haut de gamme. Je me demande si ce n'est pas ce DSP qui permet des égaliseurs para-graphiques avancés...
Bon, on retrouve aussi quelques références plus entrée de gamme Sharc sur du Denon , Marantz, et Ampli Yamaha Aventage....
C'est Analog Device qui fait ça, les mêmes qui propose des scalers comme celui intégré aux Denon de la gamme 2012/2013
Bon, on retrouve aussi quelques références plus entrée de gamme Sharc sur du Denon , Marantz, et Ampli Yamaha Aventage....
C'est Analog Device qui fait ça, les mêmes qui propose des scalers comme celui intégré aux Denon de la gamme 2012/2013
-
- Posts: 190
- Joined: Mon Jul 16, 2012 8:56 am
Re: Camridge 551R : ampli AV audiophile 7.1 : Présentation, Test, CR
Bon ca y est, en cherchant un peu on finit par trouver des descriptions plus fines (pas pour les DAC malheureusement)
751R :
It’s the sound that matters:
Cambridge Audio has always had a passion for sound quality, and this is where the 751R stands head and shoulders above the competition. Utilising over 40 years of experience in the production of award winning amplifiers, Cambridge Audio truly believes the new 751R to be its best sounding AV receiver to date. Key to this claim are the 751R’s seven 120 Watt audiophile grade fully discrete amplifiers which are kept separate from the processing and input stages and feature a substantial power supply and an oversize low flux toroidal transformer. This careful design of the amplifier stages ensures that the 751R can replicate the dynamics and scale required for the most demanding movie soundtracks whilst also being able to reproduce a genuinely musical performance with either stereo or multichannel music sources. Every part of the 751R has been carefully designed to offer the ultimate in audio performance. From the ultra rigid, acoustically dampened chassis, right down to the critical selection of each individual component, no stone has been left unturned in the pursuit of audio heaven from an AV receiver.
Tentitive release date of July/August 2012
This is a pre-production communication. Design and specifications are therefore subject to chage.Advance information -751R AV receiver featuring full HDMI 1.4 3D reception and processing.
Power when you need it:
Cambridge Audio has always used ‘real world’ power ratings, which detail the maximum power output when all channels in an amplifier are driven. Unlike some other companies, who may use flattering figures into low impedances or with only some channels driven to exaggerate the claimed performance of their amplifier stages, the 751R can deliver a true 120 watts from all 7 channels, which will blow the competition out of the water, and makes the 751R the most powerful AV receiver in its class!
A great sound for any environment:
The 751R is also the first Cambridge Audio receiver to feature Audyssey 2EQ room equalisation, with a supplied microphone for extremely quick and easy
installation. Also with Audyssey Perfect Volume, the sound is fully tailored to fit your listening environment perfectly, so that you can hear music and movies just as the artists and directors intended. As part of Cambridge Audio’s ‘nocompromise’ approach to sound quality, the 751R uses three (yes 3!) full DSP stages: a Texas Instruments twin DSP chipset provides multichannel decoding in core one and then full post-processing (including room EQ and volume equalisation) in core two. Finally, a third Analog Devices DSP up-samples all audio signals to 24-bit/192kHz. For movies and TV shows, the 751R supports all of the latest surround CODECs, and can fully decode all HD audio soundtracks over both PCM and Bitstream. In addition, the Analog Devices DSP running Anagram Technologies Q5 suppresses jitter whilst up-sampling all audio signals azur 751R AV Reciever In its commitment to bringing high quality audio to the AV market, Cambridge Audio is proud to introduce its new 751R AV receiver featuring full HDMI 1.4 3D. reception and processing. Cambridge Audio 751R AV Reciever with 3D Advance information December 2010 azur 751R AV Reciever to 24-bit/192 kHz, for the ultimate in low jitter, high quality sound. For computer audio, a USB input is capable of accepting 24-bit/96kHz files from any connected computer, to provide ‘better than CD sound quality.
Cutting edge As well as great sound, the 751R is full of cutting edge video technology too:
The 751R boasts 6 HDMI inputs, and 2 outputs, which can send the same output signal to multiple displays. All incoming video signals can be scaled to1080p by a high quality Anchor Bay ABT2010 scaler, to ensure that all video signals are output in the highest possible quality, to complement the high quality audio! And completing the perfect picture, LipSync audio delay means the user can simply adjust for processing delays in the source or TV, to provide trouble free viewing.
Big power from a small package:
To extract such high levels of performance from a compact unit is no mean feat. Another crucial aspect of the 751R’s audiophile pedigree is Cambridge Audio’s – X-Tract, a proprietary forced convection heat tunnel. This revolutionary design allows the 751R to remain cool and silent whilst operating at the highest possible levels of power and performance. AV Reciever to 24-bit/192 kHz, for the ultimate in low jitter, high quality sound. For computer audio, a USB input is capable of accepting 24-bit/96kHz files from any connected computer, to provide ‘better than CD sound quality.
Cutting edge:
As well as great sound, the 751R is full of cutting edge video technology too. The 751R boasts 6 HDMI inputs, and 2 outputs, which can send the same output signal to multiple displays. All incoming video signals can be scaled to1080p by a high quality Anchor Bay ABT2010 scaler, to ensure that all video signals are output in the highest possible quality, to complement the high quality audio! And completing the perfect picture, LipSync audio delay means the user can simply adjust for processing delays in the source or TV, to provide trouble free viewing.
Big power from a small package
To extract such high levels of performance from a compact unit is no mean feat. Another crucial aspect of the 751R’s audiophile pedigree is Cambridge Audio’s – X-Tract, a proprietary forced convection heat tunnel. This revolutionary design allows the 751R to remain cool and silent whilst operating at the highest possible levels of power and performance.
Preliminary specs only:
7.1x 200w/ch
24 bit 96 khz USB input
6 HDMI in 2 out
192kHz upsampling by Analog Devices
AM/FM tuner
Powered second zone off surround rears
Separate sub out for zone 2
Anchor Bay ABT2020 video scaler
Autosetup by Audyssey 2EQ and perfect volume
RS232C
USB Audio In Yes: 24-bit/96kHz
HDMI Connections 6 (in) 2 (out)
Audio Upsampling Analog Devices 192 kHz upsampling
Built in Tuner FM (with RDS), AM
Presets 20 per band
No. of Amplifier Channels 7
Two channels driven (Stereo Mode) 2 x 140W into 8 ohms
All channels driven 7 x 120W into 8 ohms
THD at 1kHz 8? load 10 watts <0.005%
THD at 20kHz 8? load 10 watts <0.05%
THD at preamp outputs <0.009%
Frequency response 10Hz - 50 kHz -0.3dB.
Signal to noise ratio (re 1w output) >90dB
Video Scaler Anchor Bay ABT2020
Audio Decoding Dolby True HD, Dolby Digital Plus, Dolby
Digital EX, Dolby ProLogic II/IIx/Iiz, DTS
HD, DTS Master Audio, DTS ES
Disctrete/Matrix, DTS Neo6, DTS 24/96,
Autosetup Yes
Room EQ Audyssey 2EQ perfect volume
Lip sync/HDMI AutoLipSync Yes
DTS Speaker Re-Map Yes
RS-232C Yes
IR Emitter Out Yes (3)
DC Trigger Output (DC 12V) Yes (2)
Bi-Amp Drive Capability Yes
W x H x D (mm) 425 x 150 x 420
Weight 16Kg
751R :
It’s the sound that matters:
Cambridge Audio has always had a passion for sound quality, and this is where the 751R stands head and shoulders above the competition. Utilising over 40 years of experience in the production of award winning amplifiers, Cambridge Audio truly believes the new 751R to be its best sounding AV receiver to date. Key to this claim are the 751R’s seven 120 Watt audiophile grade fully discrete amplifiers which are kept separate from the processing and input stages and feature a substantial power supply and an oversize low flux toroidal transformer. This careful design of the amplifier stages ensures that the 751R can replicate the dynamics and scale required for the most demanding movie soundtracks whilst also being able to reproduce a genuinely musical performance with either stereo or multichannel music sources. Every part of the 751R has been carefully designed to offer the ultimate in audio performance. From the ultra rigid, acoustically dampened chassis, right down to the critical selection of each individual component, no stone has been left unturned in the pursuit of audio heaven from an AV receiver.
Tentitive release date of July/August 2012
This is a pre-production communication. Design and specifications are therefore subject to chage.Advance information -751R AV receiver featuring full HDMI 1.4 3D reception and processing.
Power when you need it:
Cambridge Audio has always used ‘real world’ power ratings, which detail the maximum power output when all channels in an amplifier are driven. Unlike some other companies, who may use flattering figures into low impedances or with only some channels driven to exaggerate the claimed performance of their amplifier stages, the 751R can deliver a true 120 watts from all 7 channels, which will blow the competition out of the water, and makes the 751R the most powerful AV receiver in its class!
A great sound for any environment:
The 751R is also the first Cambridge Audio receiver to feature Audyssey 2EQ room equalisation, with a supplied microphone for extremely quick and easy
installation. Also with Audyssey Perfect Volume, the sound is fully tailored to fit your listening environment perfectly, so that you can hear music and movies just as the artists and directors intended. As part of Cambridge Audio’s ‘nocompromise’ approach to sound quality, the 751R uses three (yes 3!) full DSP stages: a Texas Instruments twin DSP chipset provides multichannel decoding in core one and then full post-processing (including room EQ and volume equalisation) in core two. Finally, a third Analog Devices DSP up-samples all audio signals to 24-bit/192kHz. For movies and TV shows, the 751R supports all of the latest surround CODECs, and can fully decode all HD audio soundtracks over both PCM and Bitstream. In addition, the Analog Devices DSP running Anagram Technologies Q5 suppresses jitter whilst up-sampling all audio signals azur 751R AV Reciever In its commitment to bringing high quality audio to the AV market, Cambridge Audio is proud to introduce its new 751R AV receiver featuring full HDMI 1.4 3D. reception and processing. Cambridge Audio 751R AV Reciever with 3D Advance information December 2010 azur 751R AV Reciever to 24-bit/192 kHz, for the ultimate in low jitter, high quality sound. For computer audio, a USB input is capable of accepting 24-bit/96kHz files from any connected computer, to provide ‘better than CD sound quality.
Cutting edge As well as great sound, the 751R is full of cutting edge video technology too:
The 751R boasts 6 HDMI inputs, and 2 outputs, which can send the same output signal to multiple displays. All incoming video signals can be scaled to1080p by a high quality Anchor Bay ABT2010 scaler, to ensure that all video signals are output in the highest possible quality, to complement the high quality audio! And completing the perfect picture, LipSync audio delay means the user can simply adjust for processing delays in the source or TV, to provide trouble free viewing.
Big power from a small package:
To extract such high levels of performance from a compact unit is no mean feat. Another crucial aspect of the 751R’s audiophile pedigree is Cambridge Audio’s – X-Tract, a proprietary forced convection heat tunnel. This revolutionary design allows the 751R to remain cool and silent whilst operating at the highest possible levels of power and performance. AV Reciever to 24-bit/192 kHz, for the ultimate in low jitter, high quality sound. For computer audio, a USB input is capable of accepting 24-bit/96kHz files from any connected computer, to provide ‘better than CD sound quality.
Cutting edge:
As well as great sound, the 751R is full of cutting edge video technology too. The 751R boasts 6 HDMI inputs, and 2 outputs, which can send the same output signal to multiple displays. All incoming video signals can be scaled to1080p by a high quality Anchor Bay ABT2010 scaler, to ensure that all video signals are output in the highest possible quality, to complement the high quality audio! And completing the perfect picture, LipSync audio delay means the user can simply adjust for processing delays in the source or TV, to provide trouble free viewing.
Big power from a small package
To extract such high levels of performance from a compact unit is no mean feat. Another crucial aspect of the 751R’s audiophile pedigree is Cambridge Audio’s – X-Tract, a proprietary forced convection heat tunnel. This revolutionary design allows the 751R to remain cool and silent whilst operating at the highest possible levels of power and performance.
Preliminary specs only:
7.1x 200w/ch
24 bit 96 khz USB input
6 HDMI in 2 out
192kHz upsampling by Analog Devices
AM/FM tuner
Powered second zone off surround rears
Separate sub out for zone 2
Anchor Bay ABT2020 video scaler
Autosetup by Audyssey 2EQ and perfect volume
RS232C
USB Audio In Yes: 24-bit/96kHz
HDMI Connections 6 (in) 2 (out)
Audio Upsampling Analog Devices 192 kHz upsampling
Built in Tuner FM (with RDS), AM
Presets 20 per band
No. of Amplifier Channels 7
Two channels driven (Stereo Mode) 2 x 140W into 8 ohms
All channels driven 7 x 120W into 8 ohms
THD at 1kHz 8? load 10 watts <0.005%
THD at 20kHz 8? load 10 watts <0.05%
THD at preamp outputs <0.009%
Frequency response 10Hz - 50 kHz -0.3dB.
Signal to noise ratio (re 1w output) >90dB
Video Scaler Anchor Bay ABT2020
Audio Decoding Dolby True HD, Dolby Digital Plus, Dolby
Digital EX, Dolby ProLogic II/IIx/Iiz, DTS
HD, DTS Master Audio, DTS ES
Disctrete/Matrix, DTS Neo6, DTS 24/96,
Autosetup Yes
Room EQ Audyssey 2EQ perfect volume
Lip sync/HDMI AutoLipSync Yes
DTS Speaker Re-Map Yes
RS-232C Yes
IR Emitter Out Yes (3)
DC Trigger Output (DC 12V) Yes (2)
Bi-Amp Drive Capability Yes
W x H x D (mm) 425 x 150 x 420
Weight 16Kg