Review: 64 Audio Tia Fourté – Pushing Boundaries

64 Audio Tia Fourté

Disclaimer: The tia Fourté by 64 Audio was provided by the manufacturer for this review. 64 Audio is not a site advertiser and is not affiliated with Headfonia. Many thanks for the opportunity and generosity.

About 64 Audio

This is my third 64 Audio review now, and I hope you don’t get annoyed by the same introduction to the brand each time, but I feel it tells exactly who 64 Audio is and what they do. So here it goes one more time.

64 Audio is a US based company that specializes in making custom and universal in ear monitors, they also dipped their toes into making studio/live belt packs. As you can find out in the interview we did with them last year, 64 Audio started out as 1964 Ears and has renamed themselves. Their core is the Belonozhko brothers who all manage different departments. They have been around for almost eight years already, and have started out because of a project their founder, Vitaliy, has been working on – an in ear monitor for his wife. This project later on became what we know today as 64 Audio.

They are also one of the few companies that bring out one technology after another. They have introduced tiatm (Tubeless In-ear Audio), apextm (Air-Pressure Exchange) and LIDtm (Linear Impedance Design).

You can consider tiatm as some sort of hat-less balanced armature driver that fulfills its job in a special acoustic-chamber and doesn’t put out sound via a regular tube and dampener system. This way the treble frequency response is more extended and the resonances of the tube are eliminated, giving a more enjoyable listening experience.

apex is an interchangeable system that drastically reduces the pneumatic pressure on the eardrum, which can be found on regular custom IEM designs, and therefore enhances the safety of your hearing.

LIDtm is a new technology by 64 Audio that was introduced with the A/U12t and tiatm Trió. It is responsible for an almost flat impedance curve of the IEM, enabling it to be completely unaffected by varying output impedance of sources. This comes in very handy for touring musicians, producers and audiophiles that connect their IEMs to an array of different gear. LIDtm and its impedance behavior enable the monitors to always sound the very best, no matter the source it is connected to.

64 Audio also is one of the few companies that 3D prints your custom IEMs. It works like this: you take your regular impressions at your trusted audiologist, send them to 64 Audio, they scan them with their hardware, edit the scan to make it printable as a custom in ear and then 3D print them.

64 Audio also closely works with many professional and award winning musicians and artists such as Alessia Cara, Seal, Bon Jovi and Beyoncé. This definitely says a lot about their reputation.

64 Audio Tia Fourté

64 Audio tiatm Fourté

About tia Fourté

The tia Fourté is one of two models by 64 Audio that is solely available in universal form. The reason for this is, that the Tia models use specific acoustic chambers in which each driver performs. Getting each of these chambers packed into a custom shell is a near impossible trait. Imagine the process that would be necessary to get it done. The chambers need to have one exact size and shape and need to be at the optimum position to ensure the drivers sound like they should. Maybe this would be possible for some moulds, but certainly could not be offered for any ear-shape. So while I think it’s too bad they can’t offer it, I completely see and understand why. If you really want the superior comfort of custom shells, why not get a custom tip made by a third party? It’s a solution, maybe not the best, but a way around.

The Fourté was officially launched in November 2016 and currently resides at the absolute top of 64 Audio’s list of products. With only four drivers it is proof that the driver wars are long over and that you can create an outstanding and unique product without going full bonkers about the number of drivers implemented. The Fourté uses a ten millimeter dynamic driver for lows, a single tiatm mid-driver, one upper-mids BA driver and a single tiatm high-driver. That’s it. All drivers reside in 64 Audio’s patent pending tia system with carefully positioned chambers in which the speakers work. 64 Audio got rid of all tubes and dampers in the Fourté. I don’t know if any other company is doing that at the moment. It’s great to see manufacturers thinking out of the box and create something new in order to unleash a new sound.

64 Audio Tia Fourté

64 Audio tiatm Fourté

Fourté uses a four way passive crossover and a single bore design. The drivers are protected by an aluminium mesh, so don’t fear any earwax or debris falling in. An internal apex M20 module is installed to take down ambient noise by 20 decibels while offering reduced pneumatic pressure. It also ensures a proper phase response by switching from pressure-based to velocity-based amplitude. With 114 dB sensitivity per Milliwatt and only 10 Ohms the tiatm Fourté is pretty easy to drive. You shouldn’t run into problems driving this little gem. Under typical use the Fourté has a measured frequency response of 5Hz to 22kHz. I don’t know the dB variances for it. When asked, 64 Audio confirmed that there is no audible benefit of burn-in for the tiatm Fourté.

Due to the complicated build process and the number of orders 64 Audio is facing for Fourté, there is a waiting time of six to seven weeks to receive them.

tiatm Fourté sells for an eye-watering price of 3599 US Dollars. On rare occasions 64 Audio also offers them with slight visual blemishes at a lower price in their B-stock sales. Make sure to check that part of their website on a regular basis, as they usually sell within the shortest of time.

More about the Fourté on Page 2

Review: 64 Audio Tia Fourté – Pushing Boundaries
4.7 (94.02%) 127 votes

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A daytime code monkey with a passion for audio and his kids, Linus tends to look at gear with a technical approach, trying to understand why certain things sound the way they do. When there is no music around, Linus goes the extra mile and annoys the hell out of his colleagues with low level beatboxing.

    44 Comments

    • Reply May 30, 2018

      Robert Horton

      Who makes custom tips for these

      • Reply May 30, 2018

        Linus

        I’d try the ususal suspects: Snugs or Custom Art
        But I think you would also have to send in your Fourté then.

    • Reply June 3, 2018

      Matt

      Great review but I think the big question is how them compare to the mighty electrostatic KSE1500?

      • Reply June 4, 2018

        Linus

        Hi Matt,
        thanks for your comment.
        That truly would be an interesting comparison. If I ever get the chance to audition the KSE1500 for a longer period (no show conditions), I will add them to the list here, but untill then, I will not be able to compare the Fourté to the Shure, sorry.

    • Reply June 9, 2018

      Clarence

      If you have a chance, check out the VE Erlkönig, I would say this a the ultimate end game iem. A perfect marriage between technicality and musicality.

      • Reply June 9, 2018

        Linus

        Hi Clarence,

        thanks for your impressions on the Erlkönig. I think Lieven might be going to check it out. Not sure though. If he will, I might send/give him the Fourté for comparison. That will sure be an interesting fight 😉

        Cheers and have a great weekend!

    • Reply June 18, 2018

      Charles Ma

      Really appreciate this review of the 64Audio Tia Fourte. I currently have a Sony NW-WM1Z and I would like to be able to connect the Tia Fourte to the NW-WM1Z via the 4.4mm balanced jack. Would you recommend some cables for this setup? Any price range is fine for me. Thanks again.

      • Reply June 19, 2018

        Fiasco1

        I’m currently using the Tia Fourte with 1Z, Leonidas and foam tips. It’s a wonderful combo, with the Leonidas adding some dynamics throughout the spectrum that you don’t quite get with stock cable.

    • Reply June 18, 2018

      Linus

      Hi Charles,
      thanks for your comment.

      It all depends on how you want to change the signature of Fourté?

      If you want to keep the key-signature but push it a bit further on technicalities, give the Bespoke Ares II 8 wire of Effect Audio a go.

      If you want to push Fourté to its very limits, take a look at the Effect Audio Leonidas or Gold Plated Silver Exo (plusSound).

      If you want to give Fourté a more mainstream tuning and take down those highs, check out the Tri-Copper of plusSound, I have it in the X8 version and it does wonders to it.

      I expect that the PWaudio 1960s 2wire also works really well with the Fourté, unfortunately mine is currently in for repair services, therefore I can’t say much about it.
      Two other cables I’m really interested in are the two Janus variants (D and B), when the review comes, I will include the Fourté in the pairings section.

    • Reply December 11, 2018

      Dariusz Kawulok

      Hello
      Thanks so much for your review. I read it twice :). Last week I had the u12 and the U18 demos for a couple of days . This was an interesting experience. I am waiting for the Forte demo. I wanted to ask , I have a astell&Kern 300 but am afraid it might be too bright ( it was for the U18) would you suggest getting the hugo2 or changing it in favour of sp1000 ?
      Thanks a lot

      • Reply December 12, 2018

        Linus

        Hi Dariusz,

        thanks for your comment.
        If the U18 was already too bright, you might find the Fourté even more so.
        My experience with the AK300 has been very limited, so I can’t really speak for it.
        I’ve heard a few people say the Hugo2 is too bright for their taste. So you definitely should demo that before you make a decision.
        As for going straight to the SP1000, if you want a brand new unit, you should also consider the SP1000M, it is very similar to the SP1000 in terms of performance, but it’s more pocket friendly in the sense of portability and costs. I have it for a month now, and haven’t used the SP1000 much since.

        If neither of the sources changes the treble to something more manageable for you, there’s also the option to swap cables to something like the Tri Copper by Plussound, that one beefs up the U18 and tames treble. Changing eartips also can help, but I don’t have a solid recommendation for that.

        The U12t isn’t for you? Since you demoed it together with the 18… The A12t is among my personal favorite monitors. 🙂

        Hope that helps.

        • Reply December 27, 2018

          Dariusz Kawulok

          Hi Linus ,
          Thanks so much for your reply. Also auditioned the Tia Forte. It sounded wonderful but for me I think I like to be more closer to the sound and the U18 is all about that for me. There were more emotions and I felt more moved by the music. The Tia Forte presented the sound from a distance and that is not for me. Perhaps too m@ny years on the stage with the real instruments. 🙂 Also I think you mentioned it , the sound stage is wider in U18 and thus there’s was more order in that. And I am considering changing the source either to ultima sp1000 or the Sony wm1z you talked about in one of your reviews. I needed to listen. I like emotions in the music but I also like perfection in the sense of order. Even if there is a lot of happening in the song you can still enjoy it because it is not “too busy” that it becomes chaotic and not enjoyable. Do you know what I mean ? What would you suggest here ?
          Thanks a lot

          • Reply December 28, 2018

            Linus

            Hi Dariusz,
            don’t worry, that’s what the comment section is for.
            The SP1000 is extremely precise. It has the best technical performance I know, but it can also sound emotional. I really can’t speak for the Sony. I only listened to it a year ago at a show in Paris… don’t want to make any comparisons based on memory.
            I love the SP1000, but you should also try to audition the smaller version (M). It has many characteristics of the SP1K, but in a more affordable and compact package.
            Another DAP worth considering is the Lotoo Paw Gold Touch. If you can, you should also audition it.

            • Reply December 30, 2018

              Dariusz Kawulok

              Thanks a lot for help. I heard the spkm is a bit on the warmer side ( more body) but smaller stage than the spk.

    • Reply December 20, 2018

      Bearcat M Sandor

      Are they relatively neutral? Is there any reason that they wouldn’t work well for audio engineering?

    • Reply January 1, 2019

      Dariusz Kawulok

      Linus I have a final question. I read some reviews that stated that the 64 audio universal IEM sound noticeably worse that the custom fit. Because of fit ( seal) issues that’s sound signature was not as good as it the custom fit models. Did you have the same observation with any of the models ? I am thinking of getting custom tips from Custom Arts for the U18 as it is too late to change my order. Would you say that that might be better ? Thanks a lot for your time 🙂

      • Reply January 1, 2019

        Linus

        Hi Dariusz,

        no worries, happy to help.
        I can only speak for one 64 universal and that’s the Fourté, all my others are custom. So I can’t compare the U18 to the A18, sorry. But I’d suggest trying out the U18 and then decide if you’re happy with the fit and seal and if you are not, then go for a custom tip. That should help then.

        I also forgot to reply to your previous comment, sorry.
        Yes, the M is more on the warmer side, compared to the SPK, but it’s still a fantastic sounding device at a smaller package. There’s a some advantages that the SPK has (more memory, additional optical output), but overall the M provides a great overall performance and package.

        Happy New year!

        • Reply January 1, 2019

          Dariusz Kawulok

          Thanks again.
          All the best in The New Year

        • Reply January 2, 2019

          Dariusz Kawulok

          Hello Linus
          I promise this is the last one 🙂
          I saw in your reviews that you used either sp1000 or chord Hugo2. As you know I have AK300 and want upgrade. But the question is if I buy sp1000 I will have to sell the AK300 and lose some money on this. But I wondered if I were to keep it and just get the Hugo2 ( or other good amp like woo audio wa8 eclipse ) would I have similar quality of the sound as I would from the sp1000? Or is this just wishful thinking ? Would you be so kind and let me know ? Thanks again !!!!!

          • Reply January 2, 2019

            Linus

            Hi Dariusz,
            don’t worry, I’m happy to help.

            I’m a big fan of both, the SPK and Hugo2. Both provide me something special. The SPK is definitely the best dap out there at the moment when looking at the complete package. The AK is stellar with iems and easy to drive headphones, but can’t keep up with the Hugo2 for full sized ones. I also find hybrids better on the Hugo2. The Hugo2 to me is the best transportable DAC/Amp to date.

            You shouldn’t forget that the AK is a complete source, where you only need your music on it, while you’ll need something that provides the files to the Hugo2.

            I’m not very fond of stacking, and I strongly prefer single units over two or let alone three and more.

            On a sound level alone, both are very close to each other in my opinion. Personally, I couldn’t do without either. Not really the answer you’re looking for I assume. 😉

            • Reply January 2, 2019

              Dariusz Kawulok

              Hello Linus,
              Yes that is not the answer I was looking for exactly 🙂 I thought you would say sell it and get spk. But alright I will than try to sell it and look for the spk. As I think that the source ak300 might be poorer. However my thinking is that AK would serve as a transport/ HARD DISC and Hugo as DAC/AMP. and the quality would still be stellar ? Am I wright ?

              • Reply January 2, 2019

                Linus

                Hi Dariusz,
                sorry about that 😀

                The SP1000 is an exceptional good DAP. You won’t regret the decision.
                Yes, the Hugo2 is a stellar product, no matter what transport you’re using, but it has a tendency to sound even better with certain transports. Hope that makes sense.

                Do you have any chance to test SP1000 or Hugo2? Maybe even side by side and together with an OTG cable?

                • Reply January 2, 2019

                  Dariusz Kawulok

                  Hello
                  I think I will be able to audition both together and I will have a better idea to make a decision. 🙂 Thanks so much for your time !!!!
                  Keep up the great work. I am a fan of yours. Greetings from Poland

                  • Reply January 2, 2019

                    Linus

                    Hi Dariusz,
                    no worries, glad to be able to help.
                    Thanks for your nice words. 🙂
                    Hope the audition is tons of fun. You’re in for a real treat with the SP1000 and Hugo2.
                    Cheers, from Vienna 😉

    • Reply January 1, 2019

      Jonathan Alexander

      Great review,

      I am going to audition tia fourte next week. Any insight how it will differ from audeze lcdi4? Since my current set up is using sp1000 with hugo2 on audeze lcdi4.

      Many thanks in advance.

      • Reply January 1, 2019

        Linus

        Hi Jonathan,
        thanks for your comment.
        Unfortunately I haven’t heard the LCDi4. It’s one of the monitors that very much interests me, but auditioning it is quite difficult here, as no dealer wants to put one on demo. In ears are considered unsanitary by the dealers… If I ever get the chance to try then out for good, I’ll let you know.

        Have a great 2019!

      • Reply January 1, 2019

        Dariusz Kawulok

        Hello Jonathan,
        Is there a significant difference adding the hugo2 to the sp1000 set up? I thought the DC and the amp in spk is super good ?
        Thanks

        • Reply January 2, 2019

          Linus

          Hi Dariusz,
          the implementation on the SP1000 is excellent.

          Maybe the LCDi4 is one of those monitors that sounds better with additional power. Like I mentioned in my previous comment, some IEMs (hybrids) tend to work better with the Hugo2 than the SP1000 in my experience.

          However, I also noticed that the Hugo2 sounds different (better to me) when using a transport that runs on batteries. It’s my preferred setting for the Hugo2 too.

          • Reply January 3, 2019

            Dariusz Kawulok

            Hi Linus
            I thought of one last thing to ask you. Sorry for making it a bit of off topic. We were discussing the sp1000 but here in my country the AK 380 has become a real bargain. A 1/3 of the ultima price. Do you have much experience with listening to hat model ? Especially the copper version ?thanks again 🙂

            • Reply January 4, 2019

              Linus

              Hi Dariusz,

              I have had the copper at home for two weeks to try out before I decided the difference wasn’t big enough to justify the additional cost to the other AK380’s. I used to have the black AK380 before I jumped on the SP1000. The differences are very obvious when you listen to the SPK and then go back to the 380. It’s more precise and dynamic. The 380 was great, but the SPK was just better.

              If you can score a 380 for a third of the price, that’s a fantastic deal. But keep in mind, the 380 hasn’t seen a fw update in a while and isn’t on the list for AK’s Open Service (sideloading apps) feature. So if you’re after Spotify, Qobuz etc, it probably won’t happen.

              • Reply January 4, 2019

                Dariusz Kawulok

                Thants a lot Linus.
                I haven’t answered your previous post about the difference between 64 audio U12 and U18. I did like the base and mid-range in the U12 much more. But the stage was so much better. When I listened to more complex songs, whent there were a lot of instruments or just tehre was a lot of happening the u12 showed more clamped notes together weheres the U18 showed a lot more order and thus I was more interested to listen to those complex song , ofcourse I was listening on AK 300. And perhaps the situation with U12 would heva been different with SPK. but I hope that the U18 with SPK will go lower and a bit warmer than it was on my ak300.

                • Reply January 4, 2019

                  Linus

                  Hi Dariusz,

                  no worries. Glad I could help.
                  Yeah, the 18t is something special. I wouldn’t say it plays particularly warm on the SP1000. The AK is very precise and clean.
                  If you enjoy the technical abilities of the SPK, you should try it with the Leonidas II, it gets even better. It’s my preferred cable for the A18.
                  I fully agree on the 12t/18t differences. I prefer the A12t though, but the A18 is better on some fronts. 🙂

                  • Reply January 4, 2019

                    Dariusz Kawulok

                    Linus , thanks again for your honest answer. I a bit question my decision about the U18.

              • Reply January 8, 2019

                Dariusz Kawulok

                Hello Linus ,
                I don’t want to make too many off topic questions so if you would prefer I could Pm you if you don’t wish for this thread to be messed. But I would like to ask your preferred high quality streaming platform ? I use Tidal Hifi. But I heard qobuz is better. And also does it make sense to purchase high res music ? Eg dsd etc ? Thanks again for always constructive answers and time.

                • Reply January 8, 2019

                  Linus

                  Hi Dariusz,

                  I do have a Tidal HiFi/Masters account, which I however only use in combination with Roon and their Roon Radio service. It’s been ages since I browsed Tidal. Mostly because I have a well sized selection of music I like. At home we usually tend to listen to LP’s (the kids love it) unless I’m writing, then it’s Roon time with some DACs and Amps. 🙂

                  I heard Qobuz is supposed to be better for Classical music in particular, haven’t given it a real try. Maybe I should, but as mentioned. Streaming only via Roon Radio.

                  I’m not the biggest fan of DSD to be honest. You have to keep in mind that most of the DSD content was never recorded as such. It’s mostly just upsampled PCM with some remastering. I think the mastering is more important to be honest. A well produced 16/44.1 can also sound spectacular.

                  It isn’t always about the file types and sampling rates, one example would be the “Blood, Sugar, Sex, Magik” album by the Red Hot Chili Peppers. It sounds really great in 16/44.1 but also exists as 24/96 (HD Tracks download I think). The 24bit to me doesn’t really sound any better than the 16bit version, but occupies more space on your memory… Sometimes though a 24bit remaster can also sound better (like some Nirvana albums). It’s all about the mastering in my opinion.

                  • Reply January 10, 2019

                    Dariusz Kawulok

                    Thanks a lot.
                    Do you have some downloaded albums or mostly stream ? How do you listen to lp on headphones ? Or do you convert them into digital tracks ? What is your favourite stationery setup ?
                    Thanks

                    • Reply January 10, 2019

                      Linus

                      No problem.
                      I hardly ever stream, so downloaded music it is.
                      For the turntable I don’t use any headphones, just my bookshelf speakers (Triangle Titus). This way the kids can listen too 😉
                      Favorite stationary setup? Depends on the headphones. For the HD800S it’s Qutest -> Lyr 3 (TungSol tubes) and for the Ether 2 it’s Qutest -> iHA6.

                      • January 10, 2019

                        Dariusz Kawulok

                        Thanks 🙂
                        Thanks you download from Tidal ?
                        For your IEM you use chord Hugo 2?

                      • January 10, 2019

                        Dariusz Kawulok

                        Also wanted to ask you. If you were to pick just one headphone/ IEM waht would be your choice ? The reason I ask is that my journey for headphones / IEm is that I travel a lot , 5 months out of the year. So carrying big headphones and amps to hotel is a bit crazy ( I have done it before ) also in bed at night using IEM is better so I don’t wake my wife up. That was the reasoning for me to get the best IEM that I could use on all ocasions . But I guess the ether play differently than IEM ? ANYEAY WAHT IS YOUR TAKE ON THIS ? what would you advise ? Getting a separate full headphone ?

                    • Reply January 11, 2019

                      Linus

                      Hi Dariusz,
                      for some reason I can’t reply to the below questions directly.

                      I only download from Tidal what I can’t find otherwise.
                      Yeah, I also use the H2 with IEMs, but it’s also superb with full sized headphones.

                      As for the question about what to use. That’s a real tough one to be honest, which I can’t really answer… I like a lot of my IEMs for their respective strengths.
                      I used to also travel a lot for my previous job, and I think a CIEM is the perfect solution. It’s comfortable and easy to bring along.
                      I also used to carry an extra amp with me at times, but that’s passé, doesn’t make much sense imo. A good CIEM and a good DAP is all you need.

                      • January 14, 2019

                        Dariusz Kawulok

                        Hello Linus,
                        Is there an place I could sent PM to you. I would love to ask a couple of questions but don’t want to trash here with off topics. You can see my email address right?
                        Thanks a lot for all your help

    • Reply January 10, 2019

      Roger

      where would you place the Forte with regard to the Empire Ears Zeus XR with Adel and their Legend X. Currently have these two CIEMs running on a variety of cables (mostly Effect Audio cables). So far my favorite combinations for these are running the Horus 8 with the Zeus XR while preferring the Leonidas 8 with the Legend X. run these from the SP1000 when on the go and route through the TA-ZH1ES at home…and for work and lower grade sounds…running through the PHA-3. been considering trying out the 64 Audio line up or the UE, but might need a little convincing .

      • Reply January 11, 2019

        Linus

        Hi Roger,

        thanks for your comment.
        I only can speak for the Zeus XIV, non Adel. The Fourté probably lies somewhere in between the Zeus and Legend X in terms of bass. It has a fuller midrange than the Zeus, but more air than the Legend. The treble is more like the Zeus’ but brighter.
        I’m mostly using the Leonidas II nowadays with these. I had the Horus for a bit last year, but never was able to try it out with either Legend, Zeus or Fourté. So can’t comment there…

        Have a good one!

      • Reply January 21, 2019

        Tomasz

        Hi Dariusz,

        Have you bought the SP1000?
        I pair mine with u18t with very good results.
        Also had a chance to listen to them with AK300 before I bought SP1000 but it was way to bright to my taste even with the Apex M20 module.
        Even earlier I had Hugo2 but sold it as connecting and disconnecting to my smartphone was driving me crazy. Also pairing it with Audeze LCD-XC, which I eventually sold too, was to bright.
        A friend of mine actually tried Hugo2 with u18t but it was too bright to him.

        So SP1000 and u18t is the solution that works great for me in my frequent travels. When I am back at home I hook up the SP1000 to analog input of my amp and enjoy it as a source.

        Tomasz

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