Coherent Systems about us
Established in 2002 originally as Omiga Audio by Tim Price and Tony Sallis, based in Cheltenham supplying O.E. manufacturers with signal transfer devices and digital integration systems. After a management take over in 2005 Coherent Systems was set up as high end dealership specialising in superb equipment with system optimisation and synergy at the the heart of our principles.
We are one of the foremost digital audio specialists in the country with over 25 years of specialist experience in this area, from CD players to high resolution playback we can deliver a sound that will delight.
Simply put – unparalleled experience in all aspects of domestic audio together with a careful selection of superlative equipment from accomplished manufacturers.
We don't stock expensive jewellery; we simply demonstrate equipment that really does work at making music, right across the price spectrum.
located conveniently between the Buckinghamshire/Berkshire/Hertfordshire borders. Better than any traditional hi-fi shop, we are an audio consultancy. Our demonstration room is your own listening room. Enabling you to obtain a real perspective on how equipment sounds in genuine environment. Coherent Systems is ideally placed to serve the whole of London and the Home Counties.
Please take time to read some feedback from happy customers over the last 16 years.
Coherent Systems Customer Feedback
We are not your typical audio dealership, Coherent Systems have been successfully helping music lovers achieve their audio goals the way they wish to, our experience both with sound quality and electronic engineering is widely recognised as extremely trustworthy
Why not give us a call and find out how Coherent Systems can help you.
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Coherent Systems also offer a wide range of services that forum users may find helpful these include, Installation of dedicated mains supplies for audio and home cinema systems fully approved and certified. Repairing of a wide range of audio equipment and beyond we also offer a bespoke upgrade service tailored to each customers individual needs and we can demonstrate options far beyond tradition so called high end equipment.
Why not give us a call and find out why we are highly regarded within our profession
Coherent Systems Contact details
Our repair and upgrade facilities sport some of the very latest and specialist test and measurement equipment from the world's best manufacturers Teledyne LeCroy Keysight , Rohde & Schwarz, Tektronix, Kikusui, Picotech, Flir, GW Instek, Rigol, Siglent. 12bit oscilloscopes, up to 8Ghz bandwidth, Real time spectrum analyzers, ultra low noise bench power supplies and 7.5 digit multi meters, Vector network analyzers (cable and transmission line measurements). We are very well placed to identify any issues within your problematic equipment. We strongly believe we have one of the best lab facilities for audio within the UK and that includes many manufacturers of audio equipment!
Coherent Systems have over the years acquired state of art electronics test equipment to enable us to investigate pretty much any issue that affects audio equipment. We can go in-depth into RF and EMI emission testing both conducted and radiated at a board level with real time spectrum analysis and large GHz bandwidth oscilloscopes, LISN’s impedance analyzers, power analyzers, Audio analyzers thermal imaging camera’s etc. We have the ability to deep dive into those most interesting of problems!
From time to time those audio electronics we cherish and adore so much can run into problems.
Whether its a noisy channel, low output on your pre-amplifier, distortion issues or plain non functionality.
So, if your DAC is poorly, your valve amplifier is sounding a little off colour, or maybe your CD player has just given up the ghost. We can help with these matters.
Coherent Systems has a fully comprehensive electronics lab coupled with the expertise and knowledge of over 50 years experience in electronics and electrical engineering field. Including: fault finding and diagnostic work.
We have a very open policy when it comes to repairs. No large and unforeseen hidden expenses. We investigate first, advise you of the situation then discuss the best possible course of action for the individual circumstances, making sure you are kept in formed at all times.
We specialize in all digital electronics, CD/SACD/DVD players. Amplifiers (both solid state and valve), digital to analogue converters, power supplies too.
We also have great experience with turntables both in mechanical repairs and set up and use the very latest tools to extract the best form your vinyl playback.
Coherent Systems take pride and care in their workmanship and understand all equipment being repaired is looked after correctly.
Insured collection and delivery service also available.
An image of one of our designs power supply being thoroughly tested for CE emissions before any work commences. Looking at the incoming mains noise and how much conducted noise is being transferred to the PSU and the end result we are looking at CISPER 16 standards for DC output ripple and harmonic noise via a real time.
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Here was are looking into the jitter spectra, trend RJ/DJ and histogram of a Mutec MC3 clock with our superb LeCroy Wavepro 254 12 bit scope with a Rigol MSO8000 providing damn fine conformation of the results
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Here is one of our new QP-1 ultra quiet power supply being measured with a 1 amp dynamic load applied to the DUT (device under test) as you can see it clearly show dc line ripple noise below 18uv which is quite decent given its actually being measured with a genuinely working load applied! To put this into perspective our Keysight E36313A industry standard has a ripple noise of 'only' 350uv
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Here is one of our new QP-1 ultra quiet power supply being measured with a 1 amp dynamic load applied to the DUT (device under test) as you can see it clearly show dc line ripple noise below 18uv which is quite decent given its actually being measured with a genuinely working load applied! To put this into perspective our Keysight E36313A industry standard has a ripple noise of 'only' 350uv
Some more of the instruments we have in the Lab, A 2Ghz 500Mpts MSO Oscilloscope, 150Mhz Function generator, 6.6Ghz Real time spectrum analyzer, Vector network analyzer
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Some of the other test equipment gracing our lab.
Here we have our JBC soldering suite which can handle just about any soldering issue that may arise
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Here we are testing a new regulator design with the DC power analyzer which is both a power supply, dc load, sink and data logger very useful piece of equipment for characterizing power supplies.
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Lastly demonstration of an ultra clean linear audio dc power supply happily delivering a solid 2 amps @ 12Vdc through a dynamic dc load.
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This week due the complexity of of designing SMPS (Non audio versions!) and keeping the the liner power supplies as quiet as humanly possible.
This week have taken delivery of a lovely very low noise 12 bit LeCroy scope for low level power rail and mains measurements along with some useful voltage and current probes so this enables us to really dig deep into the heart of the audio and look at those circuit board induced noise without having to spend all day setting up TDR kit.
Proving a great tool in the arsenal for reducing both mains and dc noise in electronic circuits in general.
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Well the last few weeks have been incredibly busy with upgrades, repairs and new sales not had much time to get to grips with a few projects I have been working on.
Also we have been updating the electronics lab and expanding the research space we have.
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This week we have taken delivery of some interesting new additions to the audio side of electronics business, a Rhode & Schwarz UPV66 audio analyzer with full full sweet of audio analysis capabilities. The same model that Hifi World use only ours uses a separate monitor screen, just getting to grips with this as it sports different features than my Standford Research SR785
More on this in coming weeks, as now we can look into the other side of audio measurements for any correlations after 20Khz and spurious noise well above this threshold.
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