Gyraf Audio Gyratec XXIV Passive Compressor
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Gyraf Audio Gyratec 24
Gyraf Audio Gyratec XXIV Passive Compressor
The G24 is an entirely new type of stereo compressor - aimed at mix and mastering functions. Like it's sister and predecessor, the G23 EQ, it's for those situations where you have a mix that is already nearly-perfect balanced, but you want to control some part of its dynamic without messing up the overall definition.
Gentleness and subtlety were again our main design targets here: This compresor is based on a carefully designed fully passive signal path, consisting of one metal film resistor, one audio transformer and one photo resistor per channel. That's it. Nothing more.
Yes, the elaborate sidechain and controls need active electronics (and thus a power supply, contrary to G21) - but all these analogue engines only ever interacts with your audio by directing a bit of light to an array of photo resistors dragging that channel towards one or the other phase of the opposite channel signal. Nothing else.
We believe this to be the most important innovation in the G24, the passive audio path - inspiration and technology borrowed from the notorious G21. But this is far from the only innovation that sets it apart from every other compressor out there: Most of it's intricate control system was conceived from scratch, following a stringent "what-if" paradigm of research, trial and error. This
- Dual sidechain. No, not just a dual-mono option, but two separate stereo-compressor sidechains acting simultaneusly on the signal. Equals two separate stereo compressors. You can use one to grab short transients with fast timong, and the other to slowly ride gain... On top of this we give you the "Control" pot, that morphs seamlessly between the two compressors
- Gradually variable all the way from L/R to M/S. Yes, although the G24 can be thought of as a couple of stereo compressors, it is in reality two M/S compressors that are fully variable all the way from from M-only (Mid component) to S-only (Side component) - the beauty being that when the "Elliptic" control is centered, (M-compression = S-compression), it acts (and is) the same as a stereo compressor. or rather: Two stereo compressors..
- Compression Fully variable from FeedForward to FeedBack. Now wait, two individual compressors, you say: But how do we decide which of those comes first? Kinda important factor in compression, is it not? Aah yes. We included a "Feed" control for your convenience, allowing you to dial in a setting from feed-forward to feedback INCLUDING everything in-between. You are not limited to having just one of them first (or last) - you can set both of them as you want, e.g. having both first (!). Uh - and you can set them in-between also, off course - you may realize that FF and FB compression are subjectively perceived as two very different beasts - and the continous fade between their ways makes a lot of sense.
- Mono-compatible Sidechain signal summing for M/S collapsing to make sense. When initially trying to think up this compressor, the main design obstacle was about keeping the sidechain (relatively) simple. As we really want both L, R, M, and S to be able to contribute to the derived control voltages (because it's a MS-compressor as well as a LR), we could not simply add input/output signals to derive a singular signal for the sidechain, as this would completely cancel out the "Side" part of the signal, leaving us with only "Mid" component. One - in reality almost impossible - option would be to build four tracking sidechains, and then sum them before Ratio control. What we did is something old and new: We re-purposed an ancient signal processor that was designed to maintain mono compatibility for stereo signals e.g. when transmitted over AM - this processor shifts signal phase +90 and -90 degrees in the two (LR), which ensures that when adding the two channels after processing, you get +3dB Side component and +3dB Mid, in stead of loosing all "S" and getting +6dB of "M"
- Sidechain Tilt emphasis
One meter - some metering compromises.
As you may or may not know, optical compressors can no longer be sold in the EU or California. No execptions. The industry (of which I'm part) is trying to ignore this away, and the G24 was conceived as a protest against an environmental legislation that allows massive amounts of Cadmium for batteries, yet bans an entire division of audio processing in order to save the environment from the very-small amounts of Cd in these OptoCouplers. All very technical and sad, don't get me started... The "Aggressive" part of the unit's name comes not from it's way of behaving, but from my aim of stirring up the soup to get some sort of focus on the unbearable situation for real pro audio because of these rules...
What it sums up to is the fact that the G24 is not really for sale, as we can't sell you it's heart - the CdS cell. We will need to remain legal owners of that central part, and only only lease it to you temporarily.
That is; You want one, we will need you to sign an agreement that we own the heart, and that at some time (if ever), when we have found a suitable replacement material and shipped you a module containing a new and legal part, that you will open the unit, plug the new one in, and send the old one home to us. We have arranged a disposal ritual as a small yellow-orange dot on a piece of pottery from a local artist - this is one of the legal uses of cadmium. So prepare for some paperwork if you're in the EU or California like 95% of our customers.
G24 is M/S, two sets of controls - and passive. There is an option to buffer output to ensure drive capability for difficult loads if such are encountered. G21 anyone? Bypass is as always full-relay, and G24 has a output trim function for easing comparison between direct and processed material.
The G24 is as standard available as 230V or 115V mains voltages - Please specify when ordering