Home Forums DIY Speakers and Subwoofers Fion 2 way speakers – DIY HIFI

  • Creator
  • #14579

    Hi everybody!

    Im a hobbyist speakerbuilder from germany and im new around here 🙂.
    I’ve been into the hobby for a good 2 years now and i finally managed to develope my first speaker ever!
    I used a 5″ Dayton Audio Woofer and a 1″ SB Acoustics Tweeter and gave it the name Fion (first one).

    Im more than pleased with the outcome and hope i can maybe inspire some of you 🙂
    You will find the free documentation and buildplans in the PDF when you follow the link.

  • Fion 2 way speakers – DIY HIFI

    123toid updated 7 months ago 1 Member · 7 Replies
  • 123toid

    October 26, 2021 at 7:34 am

    @filax-diy This is excellent! I’m so glad to see you were able to translate it to English! I’m looking forward to really checking these out. 

    Fion 2 way speakers – DIY HIFI

  • filax-diy

    October 26, 2021 at 8:21 am

    @123toid Thank you! I can’t wait to hear your thoughts on them!

  • btrbandit

    October 27, 2021 at 7:01 pm

    Those look fantastic!  Well done.

  • filax-diy

    November 25, 2021 at 5:40 pm

    @123toid Hey there, just wanted to ask if you had a look by now 🙂 Greetings 

  • 123toid

    November 26, 2021 at 8:20 am

    @filax-diy I did.  I think it is fantastic!  I absolutely love it.  The writeup is top notch as well. Very easy to follow and a great 2d sketch.  And the finished project looks to hit way above the budget it would cost to build. Great job! 

    The only thing I would wonder about is the woofer crossover.  Looks like a few notch filters and an inductor/resistor going to ground.  I’d love to hear, if you want to share, why you choose that layout. 

  • filax-diy

    November 26, 2021 at 8:59 am

    Thanks! Your feedback means a lot!

    If you look at the simulated filter response for the woofer you can see its effect (compare it to the woofer frequency response i measured without the crossover).
    The combination of notchfilters and lowpass with extra inductor takes away about 4 dB between 600 – 3000 Hz and flattens the woofers response. Also i found that this way the phase in the crossoverregion would be very good and giving nice summation. I experimentet a lot with different crossoverpoints (mostly way lower than the final one) and there were always problems with response being bumpy in directivity measurements while on axis being fine. This way its the best compromise i found between on axis and off axis response making the speaker sound balanced. Also price was a point to consider and this way would be cheaper than others i tried.

    I added 3 screenshots so you can see what the components are doing


  • 123toid

    November 27, 2021 at 2:52 am


    Awesome, it definitely worked out!  The response looks great.  It’s always nice to get into the mind of a designer and see what they see and choose the parts they decided on.  My initial thought, would have been to increase the inductor size and if need be add a tank capacitor/and or if needed add a parallel notch filter between the 800Hz to 3Khz region. But honestly, that is just where I would have started, who knows where I would have ended up. Could have ended up with something very similar to what you have.  It is a great response and I appreciate you going into detail over the crossover.