A frequently asked question… what’s the difference between SSL Consoles like 4000G, 6000E, 8000G+, 9000J etc.?

Today, Solid State Logic (SSL) mixing consoles are iconic studio classics. Not only have they changed the recording industry in the early 80s, but their classic E/G-series consoles as well as the SSL XL9000K are still widely in use by the author of this article and many of the best mixing engineers in the world.

In the video below, Chris Lord-Alge gives a personal introduction of his SSL console.

SSL first experimented with a protoype „A-Series“ console in the mid 70s – (two were made). SSL-founder Colin Sanders then developed it into the 4000 B-Series of which a handful were made, one of them recorded Phil Collins „In The Air Tonight“-drums at Townhouse Studios in London.

Then came the 4000 E (introduced in 1979), their „classic“ console which changed mixing forever.  The E-Series was gradually developed into the very similar 4000 G (1987) and G+ (1993) while 6000 E and G and also 8000 G and G+ were added along the line. The 4000 has 4 mix busses (2 x Stereo, or Left/Right/Center/Surround), the 6000/8000 have 6 or 8 hence and were developed for TV/Film-Mixing.

The early E-Series had the „brown“ 02 EQ on which the filters are always switched in, cutting extreme low and high end. They replaced it with the „black“ 242 EQ where the filters could be switched out completely.
SSL ConsoleWhen they started calling it G-Series, it had the 292 G-EQ first, but after a while, on clients demands, most G-Series went back to the 242 EQ from the E-Series or a mix of both.
The Channel Dynamics were kept pretty much the same from E all the way through to the G+, the only difference being different versions of the VCA-Chip.

1000s of changes where made between 1979 (first 4000 E) and 2002 (last 4000 G+ delivered which is now located in Atlanta/USA). Parts are pretty much interchangeable. You could fit an early E with some late G-Series cards and vice versa. The different revisions add up to create slightly different flavours. Roughly around 2000 of these consoles were made.

The 9000 J and K-Series (the J was released first in 1995) had a similar user layout, but very different internals. On the 9000, no capacitors are used throughout the audio path. SSL calls this technology “Superanalogue”. Theoretical bandwidth is 5Hz to 500kHz. The circuits are band limited (on purpose) to 10Hz to 80Khz on a 9000J and 10Hz to 120KHz on a 9000K.

The final XL9000K, introduced in 2002, has surfaced mount components in the centre section, compared to the J it has better headroom, bandwidth and a lot of upgrades.
Fewer consoles were sold, compared to the E/G-Series – only 190 SL9000Js and 55 XL9000K. They are mostly custom pieces.
Today’s AWS and Duality-consoles made by SSL are based on the XL9000K while being reduced in many aspects (routing, smaller power supply) and extended in others (DAW control). Today, the different building blocks of classic SSL consoles are also available separately as small modules for SSL’s own “X-Rack” format, and also in 500 Series-format.The X-Rack modules are either housed in a 19″-case that can hold a total of 8 modules and also provides SSLs famous “total recall”-system, or you can get a smaller case called MYNX that can combine two modules.


In addition to a 4000 G-Series console, I have build a small portable console with the MYNX combined with an X-Rack Input- and Master-Module. This is the most compact SSL-console ever, based on the super analogue technology of the SSL 9000K XL.

The overall design still goes back to the legacy consoles (none of the 4000 – 9000 are in production any more, but still favoured by the world’s top mixing engineers).

Any more questions, let me know… this was just the „short reply“.

The greatest resource for vintage SSL consoles is
the SSLmixed Forum.

Other great SSL resources:
Recycled Audio (used/rebuild consoles, spare parts, upgrades)
Konnektor (SSL 4000 E/G to DAW Interface)
Atomic Instruments (modern Console Power Supply)
Funky Junk UK (new and used consoles, spare parts, power supply service)
Vintage King US (new and used consoles)
Mark 1 Pro Audio World NL (used consoles, service)
Automan Efforts (modern console automation)
SSLmixed Computer (modern Console Automation – in development)