Share this project


Share this project

Radically upgrade your sound and music experience with this 100dB HiFi Bluetooth speaker/portable audio monitor. 50 hours playtime!
1,083 backers pledged £84,768 to help bring this project to life.

Tone Generator & Mono FS-X Demo

Posted by Frankenspiel Ltd. (Creator)

Thank you for your comments in response to our demo.

We've put together another quick, off-the-cuff video based on your comments to demonstrate the frequency response of the FS-X at low frequencies. We've also put together a short demo recording with a mono FS-X.

Note from the picture below how the lowest recorded hertz on the FS-X is 18.6 - this represents the lowest recordable energy. The bass is audible at around 32.3 Hz, if you listen carefully to the video with headphones you will hear this too. 

In this video we use a ‘Tone Generator’ app from Michael Heinz.

Remember: please use headphones whilst listening to this recording.

 project video thumbnail
Replay with sound
Play with

And here's a recording of a mono FS-X. We used a piece of music (Charlie Haden // First Song For Ruth) with plenty of bass to demonstrate the bass response of the FS-X.

We used an iPhone 6 to record the video this time, instead of a Rode VideoMic Rycote.

All the best,

The Frankenspiel Team


Only backers can post comments. Log In
    1. Missing avatar

      ttan on

      I think the noise may have been generated within the recording equipment (mic/DSLR) setup. If that's the case, the playback audio decibels will not be added onto the noise decibels, but in parallel (I hope that makes sense). I think the best indication that the music was being played loudly was that even the 2 other speakers were also clipping in some parts.

    2. Hong Shao Yang on

      Good Day,

      I would like a refund of my £50 pledge for the FS-X. How can I proceed about this?


    3. Jason Emery, Jester of Valoria on

      Is this good? I'm really not sure. Usually I would hope for a Rightmark-style analysis or, lacking that, just a S/N ratio and some analysis of bluetooth vs non bluetooth modes. This new type of speaker is bound to have an interesting sonic characteristic.

      Loudness tests without distortion do translate into some indication of quality at lower sound levels. I guess some people might use this at a party as a primary sound source. Not sure how big that part of the market is, but it's a plus to have that option.

      Forget if this has a non-bluetooth mode. Hopefully it does. Been so long now.

      Of course it's going to sound great with a single instrument. The single speaker doesn't have to work particularly hard to simulate that versus a full orchestra / song. But I'd be happy with it being amazing in a certain range of sounds.

      Having analysis of the speakers way ahead of time will hopefully prompt the engineers to design the subwoofer to more precisely fill in the range of falloff.

    4. Missing avatar

      Alain on

      @Creators: Will you finally answer why ?

    5. Missing avatar

      ttan on

      The first video sounds like the rumble is below the noise floor. Probably a few tens of decibel below the frequency plateau. I think not very representative of actual use

      The second video shows how BMR driver can sound when it's not pushed to the limit. But the bass notes sound rather recessed compared to the higher notes. Nevertheless, at least a decent showing.

    6. Kevin on

      How did it take you guys the best part of a month to produce such a rubbish video only to produce a much better one in a couple of hours?

    7. Peter J on

      I'm so confused. One video makes it sound... less than good. The next (only a few hours later) makes it sound pretty decent... So much hiss in the background to start with, even with a decent set of headphones (on both videos).