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  • Distortion measurements

    I do, yes. Let 'er rip!

    One of those hidden costs of DIY, actually, is the chance of letting the smoke out of a driver or two. The people who ride the wave of kits/established designs benefit greatly from people who are willing to spend the time and money, running the risk of blowing an expensive driver while rooting around for the truth.
    kennyk
  • Beocreate

    It's not so much that Sigma Studio is unfriendly, its just not consumer software meant for the end-user, it's for developers so expect it to be complicated.

    The raspberry pi implementation provides a lot more than what you get with the Sure boards, as you have a fully functional Pi at the front end so you can provide a DIY media streaming setup, design a web-interface, etc. And can be set up on wifi by simply plugging in a USB dongle. As far as the DSP programming goes, yes what is needed for the future is some libraries so that it can be programmed from Linux in the Pi itself. That would make it perfect for me anyway.
    rjj45kennykSilver1omo
  • Beocreate

    We provide the following software:

    Beocreate software suite
    This software allows you to activate a Beovox CX50/CX100 or any generic speaker and use them to connect play music via Airplay, Bluetooth or Spotify


    Raspbian Lite with the DSP toolkit installed.
    This allows you to use SigmaStudio on your PC to create you own DSP programs. Note that we recommend this only to users that are experienced with DSP tools and filter designs. While this gives you the greatest flexibility with this board, SigmaStudio is a very powerful toolkit that will require some time to understand all the features.

    DSP TCP toolkit
    This toolkit can be installed on any system that allows to install additional software (some distributions use read-only filesystems that do not allow to install additional software). This allows use to use SigmaStudio with 3rd party distributions.

    The software is open source and we’re planning to add more functionality in the future.

    kennyk
  • Beocreate

    Kornbread said:
    Neil was doing quite a bit of work on something like this. 
    I've looked into Neil's initiatives a bit, and the problem is (always) generating the BiQuads for the DSP,  Apparently Sigma Studio is very unfriendly.  The price of the BeoCrate is really not much different than the Sure JAB boards that have DSP and an amp on board. The kicker in the whole scenario is that HifiBerry is involved, and they have experience with user friendly products.  The fact of using a RasPi implies some Python libs to easily setup the BeoCrate.  Could be very useful, at a reasonable price.
    kennyk
  • Beocreate

    It's not so much that Sigma Studio is unfriendly, its just not consumer software meant for the end-user, it's for developers so expect it to be complicated.

    The raspberry pi implementation provides a lot more than what you get with the Sure boards, as you have a fully functional Pi at the front end so you can provide a DIY media streaming setup, design a web-interface, etc. And can be set up on wifi by simply plugging in a USB dongle. As far as the DSP programming goes, yes what is needed for the future is some libraries so that it can be programmed from Linux in the Pi itself. That would make it perfect for me anyway.
    rjj45kennykSilver1omo
  • Beocreate

    It's not so much that Sigma Studio is unfriendly, its just not consumer software meant for the end-user, it's for developers so expect it to be complicated.

    The raspberry pi implementation provides a lot more than what you get with the Sure boards, as you have a fully functional Pi at the front end so you can provide a DIY media streaming setup, design a web-interface, etc. And can be set up on wifi by simply plugging in a USB dongle. As far as the DSP programming goes, yes what is needed for the future is some libraries so that it can be programmed from Linux in the Pi itself. That would make it perfect for me anyway.
    rjj45kennykSilver1omo
  • Beocreate

    I noticed today that this product is finally for sale, and it looks really ideal for speaker designers. The price isn't too crazy either, considering it is complete with a 4ch amplifier.

    https://www.hifiberry.com/beocreate/

    You can set up with a raspberry pi to play music or whatever test signals remotely over wifi, and then program the DSP remotely over wifi from your couch. I'm inexperienced with Sigma Studio, but if it doesn't spit out a final transfer function of the filter, you can measure the sweep the output of the DSP fairly easily to determine a transfer function, then if you want to go passive all you have to do is come up with a matching transfer function.





    D1PP1N
  • HiVi DIY 3.1 Revisited

    It's been a pretty cold winter, which has delayed some planned projects.  This situation has presented an opportunity to dig further into the HiVi DIY 3.1's that I picked up shortly before DIY Iowa in 2017 and brought along for a quick demo.  My pair painstakingly finished in primer for the show,is shown here.This kit is still available on Amazon for $249/pair including knockdown cabinets with free shipping.  Some of the reviews indicate that the overall sound is a bit bright, but can be corrected by increasing mid and tweeter resistor values.  Rich (Turn 2) had done this to a pair that he also brought to the Iowa show, but a wiring error led to some strain on the mids - so we stopped the demo early.  Rich indicated that he had modified the resistor values.

    I wanted to start by measuring the stock FR.  This actually looks almost identical to what is posted on HiVi's website (but using a more revealing scale).  I didn't splice in any low frequency nearfield response, so anything below about 200-300 Hz is not accurate.  I guess one could call the response 89 +/- 4 dB without really lying - but most of the 8 dB variation is a steady rise from 85 dB in the 200-300 Hz area to 93 dB around 12 kHz.  I would expect this to sound a little bright and, to my ears, it does.

    The next step was to unhook the individual drivers from the crossover and see what we are working with.  The woofer is the L6-4R (4 ohm), which is the same model number sold by Madisound and Meniscus.  The in-box FR is remarkably well behaved with a very smooth rolloff starting between 2 and 3 kHz.


    The in box impedance plot shows that the cabinet is tuned to 50 Hz.  There is little else remarkable to note.
    The midrange is the DMN-B.  I used the DMN-A in my recent Indium 7 project and really liked it.  Physically the only difference I can readily observe is a 4 screw flange vs. 6 screws for the DMN-A.  6 screws would have limited the overlap between the mid and tweeter flange, so maybe that is the reason.  The frequency response is very similar to what I measured for the DMN-A with minor differences likely due to cabinet geometries.Impedance is also similar to the DMN-A, including the published Fs of 850 Hz.The tweeter is the RT-1.3B.  I have heard the 1.3 before, but have never worked with it.  The faceplate is different from the standard RT1.3, presumably to help with the physical overlap between the mid and tweeter flanges.  The frequency response is pretty well behaved, which isn't a given for a planar tweeter.  There is a slight peak at around 12kHz, which also showed up in the overall speaker response.Impedance is pretty much a flat line at around 6 ohms, as one would expect from this type of tweeter. The next step will be to use the measurements to simulate what it would take to balance out the response. 
    jr@macPWRRYDTurn2jhollander4thtryThumperTom
  • Alternative to Silicone caulk for sealing joints

    I've always wanted to build a monkey coffin, spray it with Flex-Seal, then take it out on Lake Superior!
    isaeagle4031greywardenTurn2ThumperTom
  • Alternative to Silicone caulk for sealing joints

    Avoid most of these spray on rubberized products - they outgas for a very long time and the gas they release can dissolve the glues that are used to keep drivers together. 
    jhollander