• 68 Nortoft Rd
    Gerrards Cross SL9 0LD
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    Mon-Sat 9.30 to 17.30
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Your input is important to us. Please provide your valuable feedback. Here are some testimonials from our clients:

Simon G Nagra CDC Coherent Service and repairs

"I recently managed to knock my NAGRA CDC CD player off the top of its equipment rack. After initial investigations on what to do, I was pointed in the direction of Anthony Sallis of Coherent Systems who manage servicing and repair on behalf of Padood who distribute Nagra in the UK.

The machine was dropped off at Coherent Systems on a Saturday morning where we also listened to a very enjoyable state-of-the-art yet affordable system that Tony was playing.

Early the following week Tony phoned with an assessment of what could be done, and by the Thursday the work was complete and the Nagra was being soak tested after having been repaired, cleaned and serviced.

The standard of the work and the attention to detail at Coherent Systems is absolutely first-rate. What could have been a costly repair bill simply wasn't, the rates for the work were very reasonable, couple that with friendly, professional service in a welcoming location and you have easy to recommend service.

Simon G
Date of Posting: 19 July 2021
Posted By: Simon Granger
Coherent Systems sales and service.

It’s a refreshing change these days to phone a company in search of a quotation and instead find yourself talking to someone who is very obviously knowledgable and passionate about their line of business. Tony Sallis is just such an individual. I first contacted Coherent Systems to enquire about a factory upgrade to the motor for a Mk I Oracle Delphi, but our conversation flew off on several interesting tangents and it became apparent that audio equipment and music is much more than just Tony’s day job. After our chat, Tony promptly emailed me with a set of options for my motor upgrade, including the use of some perfectly serviceable parts that had previously been removed from other Delphis (a Mk III and a Mk V) during their upgrades. A deal was struck for what I consider a very reasonable price, and the required parts arrived the next day, just as Tony had described them, and extremely well packed. So far, so good; 10/10 for customer service, but the story doesn’t end there. How many other hifi specialists are happy to field dumb questions via telephone in the evening, a couple of hours after closing time? And how many are happy to sit on the end of a phone with a power supply and multimeter, describing the pinout to a perplexed customer? Not many, I’m guessing. However Tony is just such a specialist, and well worth seeking out. The kind of kit Coherent Systems deal in is not cheap, but whether you’re looking to spend a considerable sum on upgrades, or whether you’re simply looking for some basic maintenance essentials and advice, you’ll be greeted by the same combination of dedication, enthusiasm, and professionalism.

Calvin Davidson

Date of Posting: 07 July 2021
Posted By: Calvin Davidson
Coherent Systems 6D speaker cables and service.

Morning Tony
Yes I'm delighted with the speaker leads performance, they have certainly "filled out" during the time I've had them. One thing that has surprised me is their musicality but not at the expense of detail. Certainly an excellent match with the Avalon / Vitus as you said they would be. The extra length has allowed me to get near perfect positioning and the high ceiling in our barn conversion has also aided an all round improvement. My system is in a place I didn't think possible, you have played a significant part in that.
Thank you.

David P
Central Region
Date of Posting: 07 July 2021
Posted By: David Parton
Mark Hodkinson Coherent Cabling, RTZ grounding systems and service

I contacted Tony, as I felt something was missing from my system… music !!

Having been living with Entreq cabling plus was also not happy with the large Entreq boxes and the amount of cables for grounding everything,
Decided to remove all the Entreq from my system I spoke to Tony about the way to go and my budget, a way forward was decided,
Tony arranged for 6D mains cable, 6d+ AES interconnect and 5D Speaker cable to be sent for evaluation in my system.
After a few days the system really started to open up. Over the next 2 weeks, the system was more dynamic, spacious and musical,
It was a total contrast to the lack lustre presentation of the Entreq kit.

It was decided to try one of Tony’s RTZ boxes and connections, had to wait a little while for Tony and his guys to make a new RTZ 2 mk2grounding box as they are all made in house, to Tony secret design. The RTZ 2 mk2 arrived with 5 ground cables (3 RTZ C1 & 2 RTZ C2), I connected the CD player first, and the changes started immediately, more separation, depth and dynamics. Next was the DAC board in my Amp, again more of the same. Then came the 2 connections to the Amp, wow that was a massive improvement. Finally the Streamer, all provided positive upgrade to the sound…..fast forward 2-3 weeks later and I swear that its still improving, the sound from my system is so much more enjoyable, and I’m back to listening to music not my system, and loving every minute of it.
The other great outcome is I have gone from 4 large Entreq boxes to one small half width discrete box, which outperforms all the others.


Mark H

Date of Posting: 04 June 2021
Posted By: Mark Hodkinson
Dear Tony

Firstly, apologies for the extreme lateness of providing written feedback.

As you will recall, I was interested in the Mutec MC-3+ Smart clock USB, you had a demonstration device, and a loan was quickly arranged.

I imagine some people may be put off by the display, they shouldn’t be. The reality is that it is very easy to set up.

The first album I listened to was a poor recording. I wasn’t expecting overly much. However, even from cold a difference was immediately apparent. More albums followed, always with the same beneficial result. But, and let’s face it there’s always a but, the music got better and better.

For me, the best way I can describe it is that with the Mutec in situ, the music snapped into focus. It was easier to pick out and follow the various instruments and rhythms. Listening was so much more rewarding.

For me, the key test for any new piece of equipment is how does my system sound without it? Will I still be able listen to it? Well for me the answer was that my system was the poorer without it. Obviously I could still listen but it was significantly less rewarding. So I bought the Mutec and have not regretted it. My only regret is I should have bought one sooner.

Note that I tried the Mutec MC-3+ Smart clock USB interfaced between CD player, CD transport and a music server and a variety of DACs. Whichever combination was used, the Mutec always improved my listening experience.

Many thanks for all your help and advice. I really appreciate it.

Date of Posting: 28 May 2021
Posted By: Clive Anon
Tony Coherent systems
3D XLR interconnect purchase.
Arrived next day on loan, for approval, as promised.
They have not gone back!
Complete sonic transformation. All areas improved beyond recognition.
My dealings with Tony have proved enjoyable & fruitful, he knows what he is talking about.
I can thoroughly recommend Coherent Systems. Nice guy, great service.
Patrick Hall
West Midlands
Date of Posting: 27 May 2021
Posted By: Patrick Hall
Nigel Lester Coherent Systems 4D speaker cable and interconnect cables and service

Hi Tony,

What can I say, the transformation of my system is quite remarkable. I had been listening to some pieces of music for 50 years BUT I’ve never heard them like this before!!. Other than the bigger and deeper sound-stage and instrument separation It’s the shear musicality that is impressive. As you can tell I am very impressed, their great Tony.

Regards Nigel

Nigel L W. midlands
Date of Posting: 24 May 2021
Posted By: Nigel Lester
Coherent Systems Cables Sales and Service

After contacting Tony for some advice regarding my long term system, Initially I tried some 6D speaker cable which I found to bring a greater sense of speed and transparency to the sound but it still wasn’t where I wanted it to be.

Tony was then kind enough to provide a balanced 6D interconnect and two power leads which instantly took everything to a level of musical enjoyment which I didn’t think the system was capable of. Swapping individual cables in an out only served to prove that the musical sum of the whole is indeed greater than the parts.

David S.

North of the Border
Date of Posting: 17 May 2021
Posted By: David Sneddon
Coherent Systems, Service, Upgrades and sales

Coherent Systems came to the rescue when my Bel Canto Pre3 VBS needed a new power supply. A QP1 with a 4D d.c power cable specially terminated for the Pre3 was quickly supplied and was soon doing the business.
It is obvious Tony has lots of experience with the Bel Canto brand and soon discussions turned to improving the Pre 3.

The Pre3 was duly fully overhauled and certain critical components improved what was already the best solid state per-amplifier I have heard was taken to new levels. There was a noticeable increase in the detail you could hear but without any added artificial brightness to the sound.
Some 4D xlr cables were soon added and they proved to be the icing on the cake
Overall a great experience from Tony and the team.

Mark, West Yorkshire
Date of Posting: 12 May 2021
Posted By: Mark Newton
Matthew Randall Belcanto Pre 3 servicing and upgrades

Recently had my somewhat poorly Bel Canto Pre3 pre amp serviced & tweaked by Tony & his team.
It’s been back in my system for a couple of weeks now & it’s definitely a WOW from me. It’s now sounding so much better in all areas...... cleaner, more linear, better separation bass detail & cymbals are sounding like cymbals again rather than the dustbin lids.

Tony’s communication throughout the process was first class.
I will definitely trust my Bel Canto DAC to Tony for work in the future. I would wholeheartedly recommend Tony & his team to anyone thinking of getting advice, work, or purchasing equipment from his portfolio.

Many thanks from a very satisfied customer, Matt.
Date of Posting: 10 May 2021
Posted By: Matthew Randall

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