Quantum QRT QX4


Anyone wondering whats inside one of these for the almost $3000 Nordost is asking for them? Well I owned one and took it apart, and let me tell you I was shocked!! I have never seen cheaper parts and crappy little PCB than this. I think a total of about $20 was spent on the electronics, and I am being generous. The case is by far more expensive to make. They spent more effort into making the case heavy and out of billet and extruded aluminum to give it the appearance of high end and so they could somewhat justify the price tag. It is utterly shameful what Nordost has pulled on its consumers. Thats why they have the protective sealing sticker on the chassis so no one opens it up and voids the warranty. I bought mine directly from a dealer when the Nordost rep came for a demo.
The board looked like it was a factory R&D project. Scratches all over it, a cover on the board was removed at one point leaving behind the trace of it in the left over glue. I was fuming after I opened it and witnessed the biggest ripp off in audio history. I had a Symphony Pro years ago and it blew this piece of crap out the rack.
Needless to say, even though it did provide some enhancement, I no longer have it. But before I did get rid of it I happen to make a schematic and take plenty of pictures, even built one with much needed improvements.;)
The very robust case was actually heavily softening the effect and the one inch thick sides were directing some of the energy vertically. Anyway my new version of this guy has been a huge improvement to say the least, it has 6 times the power of the QX4. Thanks Nordost ;)
dcizmok

Showing 15 responses by dcizmok

Glory

I paid $2400 for it a year ago. Dont get me wrong, it does improve the spatial imaging, but not as good as the Symphony pro did. I could place it anywhere in the room and the effects were always apparent. Not so so with the QX4. Nordost claim it to be two times as powerful than it. It is also based on the Symphony Pro which Nordost bought from Walker. Nordost clearly new what they were doing with this. There design intent was to use this unit under or between componants and hope multiple units would sell depending on placement of gear.
Tom6897

I think you are doing fine with the Shunyata stuff and should stick with it. I have nothing but Shunyata in all areas of their products line. The Thor is one unit I heard as well and thought it was a bit high priced for what it did. Its an all in one with some Qx4 like effects, but again low value for your money. Shunyata is based on designs from a guy who's an Engineer which happen to work for the NSA doing classified noise reduction studies in electrical assemblies. He used his knowledge of that and Shunyata was born. Not many have that kind of experience behind them.
Agear

I am not new to high end audio, have had many different components through out the years but never have I seen this level of shameless greed. They have reached top of the class with this product. I cant say much better for QB4 as seeing the inside revealed nothing more than star ground configuration and the pretty box. Basically The QX4 is a Schumman resonance device and there are a handful on the market to choose from without the pricetag.
Jafant

Well being at a demo its always difficult to judge whats happening. I knew a dealer that had a room setup with some pretty high end gear. We would use it as a reference to test cables and other gear brought in. Hearing it many times I knew what the new piece of gear changed in sound as soon as something was swapped. One thing he never revealed to me until I got to know him very well was the fact that he had put 4 Quantum Symphony Pros in the room. One day we were listening to a new CD and I said something didnt sound the same. He told me he deliberately turned off all of them. I was shocked by how much they had added to the sense of dimension and without them how flat everything became. Never had that experience with the QX4.
KennyB

I know you are eager to see one of these on the inside like everyone is. As for pics I am not sure there is a place I could post them to?

As for the star ground, you should do your homework and read their website. Its the first thing they even say, HELLO! Second, you should study what star ground means.

All of these types of devices are based on the Schumann resonance theory. Have a read, pretty interesting stuff. Oh yes you don't do that very much.

Thats the problem with the QX4, you have to place it right by the equipment. You didnt have to with the Symphony Pro. Although Nordost claims there unit is twice as powerful it certainly doesn't perform that way. There is no doubt it does enhance the listening experience as I said, but at almost $3K it still cant beat a $500 dollar Symphony Pro. No wonder they are to find, no one wants to sell them!

The bottom line is Nordost has been designing their gear with cost is the object guidelines but at cost is no object prices. Thats B.S., and I wont stand for it. You will never see a Nordost product in my system again. Its about their business ethics and the lack of them.

I spent a grand total of $30 dollars my cost, not the huge discounts manufacturers get when they buy thousands of bits at a time, and built one of my one.
Ldworet, I dont think I will be posting a video of a "how to build an economy QX4", but will be making them for a priveleged few for now. Who knows maybe a board and parts kit, or a complete unit might be something that could be cooking?? ;)

The way I see it is I spent almost $3K for a schematic and pictures. So I would like to show Nordost my appeciation for their business conduct and the let the audio community know just how wonderful they are.

I have seen the inside of the Symphony Pro and it is very similar to the QX4, power supply differences mostly.
KennyB

This why forums suck sometimes. At least you apologized and admitted your mistake, thank you.
Agear

Yeah I know, I'm sure there are some that are worse but dollar for dollar value, this is one which will won't slide by me. The Lexicon Bluray player that was literally an OPPO player inside with a Lexicon designed chassis really made me sick being a Lexi fan.
Polk432

Come on Polkeyman, get with the chat. We are talking about the QX4.

Did the QB wonder box blow you away? ;)
Thats what I loved about the Symphonies, placement was very widespread. It was certainly capable of emmitting its field effect very widely and strongly. I really think they are on the top of the list for these types of devices but they are hoarded and seldom up for sale and snatched up quickly. Sadly I sold mine to acquire a shiny aluminum box. Did I mention I hate Nordost??
Sabai

I just use a Shunyata Hydra 4 with, EMM CDSA-SE, Martin Logan Monolith 3's, and BAT VK50-SE pre. The BAT VK60 amp has its own conditioner. I had demo'd both the QB8 and Shunyata Hydra and heard much more difference with the Hydra. This was also very expensive gear it was demo'd with, sometimes the results are easier to hear with very transparent gear.

As far as the Symphonies, I had the Pro and thought it did a very good job. When it was off, I would notice an immediate difference. Almost as if my ears were plugged a little and couldnt hear everything the same way. I guess everyone has different expectations and results. Sometimes I have found that you have to settle in with the unit for a while and then turn it off. This might be a better approach to finding the best place to put it. Find the best recorded music you can, it can help to pickup on things easier. Complex music might be difficult to initially judge from as you have to know what the unit is enhancing.
Sabai

From what I recall the symphony had a wall wart power supply, the QX4 has a board mounted transformer. The rest of it was similar in design but different enough to accomodate larger parts and more of them. The parts are different but do the same job in the end.
Sabai
It would be more realistic to say 2 Symphony pros but the performance of one Symphony pro was way more obvious than one QX4 sadly. The QX4 when turned on is very subtle, one has to really observe the changes that are occurring. The one positive bonus the Qx4 has over the S pro is the it has a power out so you can attach it to other devices like a power conditioner like I did. This creates a secondary field effect through the AC path. But at end of the day I have say the Symphony pro was better at immediately providing its sonic benefits and more of them.
Sabai
I didnt really have a sweetspot for the Pro. It seemed to work very well alsmost anywhere it was put but generally it was in the center area of the gear. I only had one of them so it seem most appropriate. Mind you there is a point to where adding more of these units will not gain any more benefit. Three is probably plenty.
Sabai

Where are you managing to find the Pros? Hard little guy to get a hold of. Wish I never sold mine.