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Logic 7

LOGIC 7 logo on harman/kardon AVR 255

Logic 7 will mostly be referred to as "Logic 7" in this article for simplicity, even though it was rebranded a couple of times, being called LOGIC7, LOGIC7 UpMix, LOGIC7 HD, Logic 7, etc...[1][2][3][4][5][6]

Citations aren't mostly citations, but sources for the information in this article.

What is it?

Logic 7 is a surround sound processing algorithm made by an American company focusing on audio equipment known as Lexicon in 1996 with the introduction of the Lexicon DC-1 Digital Controller[7][8][9].

First ever mention of Logic 7 in the owner's manual of the DC-1

modern Lexicon logo

,,Available only in DC-1’s equipped with THX processing, this film sound mode reproduces musical material with maximum separation at all times, whether or not directional material is being steered. In addition, Logic 7 uses intelligent steering to extract wide bandwidth stereo surround channels. If both side and rear speaker pairs are available, signals may be steered between the left side and left rear, or between the right side and right rear. It is also possible for a signal to be steered fully to the rear speakers, with the side surround speakers 6dB lower than the rears to provide subjective rear imaging.''[10]

Logic 7 info on the MC-4 page

,,LOGIC7

The MC-4 features Lexicon's decoding technology: LOGIC7. Based on years of psychoacoustic research, LOGIC7 strikes a delicate balance between channel separation and surround envelopment. For music, film, and broadcast sources, LOGIC7 distinguishes between primary and background signals and processes them appropriately. Prominent sounds like a singer's voice or an airplane's roar are reproduced with stunning clarity. The signal is sent to the appropriate speaker with high channel separation, while secondary sounds like the ambient noise of a concert hall or the great outdoors are reproduced with amazing spaciousness. With LOGIC7, the listener experiences an unmatched sense of involvement.''[11]

7.1 channel surround sound speaker positioning around the white dot, being the listener.

How does it work?

In it's functional form, it is similar to the way more widespread Dolby Pro Logic II[12][13][14][15] family , mainly Dolby Pro Logic IIx as that was also of a 7.1 channel kind, originally created by Jim Fosgate[16][17][18], then reworked into a digital form with Dolby Laboratories, which came out later in 2000. It is a matrix based upmixer, just like Dolby Pro Logic family and the original Dolby Surround. Logic 7 at the time of release it's release in 1996 was only competing with Dolby Pro Logic, which came out in 1987. Logic 7 was at that time more superior, as it allowed for 7.1 channel surround sound, compared with Dolby Pro Logic's 5.1 channel surround sound limit. Logic 7 was also more suitable for music, as it didn't focus on the center channel as much, and allowed more customization on the unit. There was also a much wider frequency response range in the surround channels (453hz-20khz[19]), compared to Dolby Pro Logic's (100hz-7khz)[20] range, and Dolby Pro Logic only allowed for a single rear surround channel, in case of two stereo surround speakers, they would both play mono sound. With the arrival of Dolby Pro Logic II, allowing full frequency response range and stereo surround speakers, this was no longer the case.

Home and professional use

Logic 7 was first used only on Lexicon's units, the Lexicon DC-1 Digital Controller[21], then followed DC-2 Digital Controller[22], MC-1 Music and Cinema Processor[23], and the MC-12 Balanced and MC-12 Music and Cinema processors[24]. Then on 21st of August 2002, Lexicon added LOGIC7 UpMix software to their professional Lexicon 960L[25][26] which was not meant for home theater use like the already mentioned DC and MC line. Then there was the MC-8 Digital Controller[27]. On 12th of July 2004 Lexicon introduced it's first A/V receiver, the RV-8, which was esentially their professional amplifiers with their processors combined.[28][29][30].Then came the MC-4 Music and Cinema Processor[31]. A new variant of MC-12 Music and Cinema processor came too, called the MC-12 HD[32], but I couldn't find a release on the web. On September 6th 2007 came the RV-5 A/V receiver[33] and the MV-5 Processor[34] on the same day.

Car audio

BMW 7 Series 2002-2008 E65/E66/E67/E68

BMW E65

On January 8th 2002, Harman International first announced that the 2002 BMW 7 Series will include Logic 7 in the LOGIC 7 Professional Audio System designed by harman/kardon. It featured 13 speakers, 2 subwoofers, 6-disc in-dash CD changer, Digital Sound Processing and later MP3 playback capability with the 2006 revision. It was also able to be configured with SIRIUS Satellite Radio and HD Radio since 2006, and since the 2007 variant, there was also an auxialiary input located inside middle console. [35][36][37]. It was the first car to feature Logic 7 ever.

Do not mistake the standard 10-speaker system, which also came with two subwoofers, for a Logic 7 sound system, easiest way to tell is from the iDrive infotainment, as there will be no option for Logic 7 in the audio settings.[38][39]

It was available standard on the 2004,2005 and 2006 760Li, the 2005 and 2006 760i, all else had to have the Premium Sound Package.[40][41][42][43][44]

Data insufficient on the 2002 and 2003 models in terms of sound system availabilities.

Mercedes-Benz E-Class 2003-2009 W211

Mercedes-Benz W211

Later that year 23rd of October 2002, Harman International announced that Logic 7 will be featured in the upcoming 2003 Mercedes-Benz E-Class, and it was, but only as an optional. It was available with harman/kardon speakers, Logic 7, a total of 12 speakers, including two surround speakers and a subwoofer, powered by 9 separate amplifiers, 8 channel amplifier and Digital Dynamic Volume Control with an optional 6-CD changer connected via fiber-optic network.[45][46]

2004 sedan and wagon USA
2005 sedan and wagon USA
2006 international/2007 international
2006 E320 CDI USA
2007 USA
2008 USA
2009 USA

Rolls-Royce Phantom models 2003-2014

Rolls-Royce Phantom

After this there was the 2003 Rolls Royce Phantom also with Logic 7[54], it had 15 speakers and could be configured with a 6-DVD/CD changer as of 2006[55]. According to one web page, the Rolls Royce Phantom from 2003 shares the same amplifier with the previously mentioned 2002 BMW 7 Series with the Logic 7 capable sound system.[56]

2006 International
2006 Drophead Coupe USA
2008 Coupe USA
2010 International/2011 Drophead Coupe International
2013/2014 International

Land Rover

Range Rover R322
2002 Range Rover

Then Land Rover put Logic 7 into their 2002 Range Rover, featuring 14 harman/kardon speakers, including a subwoofer, 6-disc changer and support for DVD.[64]

2008 Range Rover Vogue/2009 Range Rover

Do not mistake the standard TDV8 HI ICE: 11 speaker harman/kardon system with DSP, with the previously mentioned, as it does not have LOGIC7.[65][66][67]

2010 Range Rover
2011 Range Rover Armoured
2011 Range Rover Vogue
2011 Range Rover Spain
2011 Range Rover USA
2012 Range Rover USA
2012 Range Rover Germany

Models starting in 2013 switched to Meridian audio technology. [78]

Discovery 3

Then came the model Discovery 3 from 2004, which also included Logic 7 with 13 harman/kardon speakers and subwoofer, DSP amplifier, and rear seat headphone modules with the Premium ICE Pack option.[79]

Hyundai

Hyundai Genesis 2009
Genesis

Eventually Hyundai partnered with Lexicon to put their audio systems into their cars in 2009[80]. First it was the model Genesis in 2009[81], which in the configuration with the 7.1 Discrete sound system featured 17 speakers in a 7.1 surround sound architecture, with one being a subwoofer, powered by an 11-channel DSP amplifier with 528W, speed sensing volume was present too. In this configuration, you got a 6-DVD/CD changer, thus the car supported the playback of DVD-Audio/Video, it also had support for DTS-CD, so you could play discrete 5.1 audio such as Dolby Digital 5.1 and DTS 5.1, and then have it upmixed to all 7.1 channels available via Logic 7. It also had support for PCM, MLP, MP3, WMA, DMB, XM Satellite Radio and HD Radio.

The cheaper option had 14 speakers with the ones missing being the two front door mid-range drivers and the center tweeter driver. It also did not have DVD or DTS-CD capabilities, thus only including a 6-disc CD changer, disallowing discrete 5.1 audio playback. It had the same amplifier too.[82][83][84][85][86]

The later iteration of the Genesis, released in 2017, also called the G80 and G90 models were the first to not feature Logic 7 surround sound technology, and instead moved onto another Lexicon's surround sound processing algorithm which replaced Logic 7, called QuantumLogic, which we will take a quick look on later.[87]

Hyundai Equus 2011
Equus

With the arrival of the 2011 revision Equus, it gained a Lexicon audio system with Logic 7 compared to its previous generation. [88]It featured a similar setup to the Genesis, 17 speakers in a 7.1 surround sound architecture, with one being a subwoofer, driven by an 11-channel DSP amplifier with 440W and a 2-channel DSP subwoofer amplifier with 168W, Discrete Logic 7 which allowed for upmixing of discrete 5.1 audio such as Dolby Digital 5.1 and DTS 5.1 to 7.1 channels. Support for DVD-Audio/Video and DTS-CD was also present. It featured a 6-DVD/CD changer, Harman Infotainment, had support for iPod and USB conectivity, and formats as MLP, MP3, WMA, DMB, XM Satellite Radio and HD Radio.[89][90][91][92][93]

Kia

Kia K9 2012
K9/K900/Quoris

Known as K900 only in the USA and as Quoris in other export markets. It is esentially a derivative of the Hyundai Equus and Genesis as previously mentioned. It was first released in 2012, and right from the bat no matter the spec featured the full 17-speaker Lexicon audio system with a 900W power amplifier, a subwoofer, 12-channel digital sound processor boasting Discrete Logic 7 surround sound audio, which could upmix discrete 5.1 audio such as Dolby Digital 5.1 and DTS 5.1 to the full 7.1 channels found inside the car, just like on the Hyundai Equus and the Genesis with the Discrete Logic 7 sound system. As mentioned above in the Hyundai section.[94][95][96]

In the following 2016 and 2017 revisions, the Lexicon system was no longer available on the Premium V6 package, however it was standard on all other.[97][98][99]

In the 2018 and onward versions, nothing seems to have changed except speaker positions.[100][101][102]

From 2021 and onward they stopped advertising the Lexicon system[103][104][105], probably due to the model being discontinued in Canada in 2018 and then later in 2021 in the USA. However I could not find the 2024 K9 being sold anywhere other than South Korea nowadays.[106]

In the 2024 revision all models except the Platinum package (base model) come with the Lexicon 17-speaker sound system, all else now newly use a Krell 14-speaker sound system.[107]



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