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4Instructables54,666Views13CommentsOakland, CAJoined October 17th, 2014
mechanical engineer by day, noisy neighbor by night.

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  • ralf_k commented on ralf_k's instructable DIY Soundbar With Built-in DSP6 weeks ago
    DIY Soundbar With Built-in DSP

    hello! in order to connect 4 speakers in the same configuration (4.0) i have shown here, you will need to connect two amplifiers via a 6-pin cable that is included with the amplifier. Output from the DSP board goes to two sets of woofers and the output from the other board goes to the tweeters. The link to the second amp is below as well as a useful instructional video. Please note that I do not use the on-board potentiometers because I reprogramed the DSP such that a custom filter can be used. You can use the configuration shown in the video but this application is limited.Amp #2: http://store3.sure-electronics.com/aa-ja32472-1797Instructions:

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  • ralf_k commented on ralf_k's instructable DIY Soundbar With Built-in DSP4 months ago
    DIY Soundbar With Built-in DSP

    Yes I agree, I didn't go into much detail about the electronic connections. You may think it's complicated but it's actually quite simple. The amplifiers I used are pretty much plug and play. I'll update the instructable with some instructions that came with the amplifiers. Believe it or not, the DSP can be used without programming, right out of the box, but not in the way I wanted.

    Hi there, I believe it's the Jasper 200J (Jasper 200J Model 200 Circle Cutting Jig for Plunge Router https://www.amazon.com/dp/B00009K77A/ref=cm_sw_r_cp_apa_i_zSG4Bb2XQ4RYV).A bit pricey but it has nicely marked holes every 1/16" which makes it very easy to cut out accurate holes with a 1/4" diameter bit. I like to keep it mounted on my plunge base and use the fixed base or table for most other router work.

    Thank you for the interest! Will post an updated SigmaStudio file this weekend...I have an external soundcard and measurement microphone coming in the mail. That should definitely help take better measurements and EQ.

    Thank you!

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  • ralf_k's instructable DIY Soundbar With Built-in DSP's weekly stats: 4 months ago
    • DIY Soundbar With Built-in DSP
      2,624 views
      27 favorites
      2 comments
  • ralf_k entered DIY Soundbar With Built-in DSP in the Audio Contest 2018 contest 4 months ago
  • ralf_k commented on ralf_k's instructable PUMBAA - Portable Bluetooth Speaker9 months ago
    PUMBAA - Portable Bluetooth Speaker

    the kit offers a pretty good value. I actually ordered each item individually at the time when I built the speaker. They did not offer it as a kit at the time. It was added as a kit recently but I think PE has problems keeping it in stock.

    thank you!

    doubt one can hear the difference...however it is a nice quality fabric with many other benefits which I didn't advertise.

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  • ralf_k's instructable PUMBAA - Portable Bluetooth Speaker's weekly stats: 9 months ago
    • PUMBAA - Portable Bluetooth Speaker
      5,795 views
      151 favorites
      4 comments
  • ralf_k commented on scoochmaroo's instructable Nutella Brownies | Three Ingredients2 years ago
    Nutella Brownies | Three Ingredients

    probably the greatest reward/effort baking experience ever...i scaled up using:- 3 jumbo eggs- 82g bread flour- 365g nutella (one 13oz jar)also threw in 1/2 cup of dark chocolate chunks and finished off by smearing peanut butter on top. yielded moist and not too "cakey" brownies. will make again, thanks!

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  • ralf_k commented on ralf_k's instructable Tubeless Bike Tire Conversion3 years ago
    Tubeless Bike Tire Conversion

    very good point. finding the sweet spot will vary by rider weight but at 170lbs I would not go lower than 20psi

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  • ralf_k commented on ralf_k's instructable Tubeless Bike Tire Conversion3 years ago
    Tubeless Bike Tire Conversion

    Yes, you can do that but (in my opinion) you would be missing out on the biggest benefit of running a tubeless system which is the ability to run lower tire pressure. Inserting sealant in the tube will provide additional puncture protection but at low tire pressures your weakest link will still be the tube's inability to withstand pinch flats. Pinch flats, even with sealant inside the tube will be hard to address. They are not small punctures but rather long parallel cuts along the tube which the sealant will not be able to seal quickly. The tire's sidewall are much better equipped to handle pinch flats hence why the tubes must go, they are simply an added point of failure. Once a tube is removed, your only point of failure is a cut in the tire which would arguable have cut the tub...

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    Yes, you can do that but (in my opinion) you would be missing out on the biggest benefit of running a tubeless system which is the ability to run lower tire pressure. Inserting sealant in the tube will provide additional puncture protection but at low tire pressures your weakest link will still be the tube's inability to withstand pinch flats. Pinch flats, even with sealant inside the tube will be hard to address. They are not small punctures but rather long parallel cuts along the tube which the sealant will not be able to seal quickly. The tire's sidewall are much better equipped to handle pinch flats hence why the tubes must go, they are simply an added point of failure. Once a tube is removed, your only point of failure is a cut in the tire which would arguable have cut the tube as well. Furthermore, you would be adding weight to the system with less benefits in return.

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