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Single small cap on waveguide type tweeter response?

DrewsBrewsDrewsBrews
edited June 27 in DIY

I have heard of using a single small cap on a tweeter with a waveguide/horn boosted response to flatten the response and create a natural crossover point. I'm playing around with the idea with the $5 buyout tweeter. Wondering if there are caveots that I'm not thinking of? I'm thinking phase will be the elephant in the room.

I took the response and gave it a tilt. This would have a nice natural crossover point ~2.4khz. Though this is not realistic as it assumes a flat slope. Guessing I'd be looking at more around 2.8khz. Planning to try a small build so small/compact crossover would be nice. Just wondering if I'm chasing my tail before I commit to making any sawdust.

[EDIT] Id put a parallel resistor to knock down the db and resonance.

Comments

  • tajanestajanes
    edited June 24

    Looks interesting. As long as the tw can handle the 1st order HP lower-ranges.

    edit: + on your edit

  • DrewsBrewsDrewsBrews

    Thanks. Based on the lack of other response I guess this was a dumb question.

    I've got some .18cf flat packs that are perfect for 830855s that I have a pile of. I'm checking out the cheap tweeters I've got to do a fun quick build. Unfortunately the techtonic units I made little enclosures for are too large to fit both drivers on the baffle or I'd just do that. The small woofer should limit the total output capability anyway so I may be able to get away with less tweeter control. Guess I've just got to try and see

    Steve_Lee
  • jr@macjr@mac

    Not a dumb question at all.

    Steve_Lee
    I have a signature.
  • DrewsBrewsDrewsBrews
    edited June 28

    Oah well. I decided to use some SB21RDCs I got a while ago on sale. I figure you guys would be more interested in that combo. Maybe use some fancy veneer and try my hand at a guitar grade french polish... I picked up some pummice powder to try the grain filling technique.

  • WolfWolf

    Got a link to the pummice method?

    InDIYana Event Website

  • BobBarktoBobBarkto

    https://www.finewoodworking.com/videoworkshop/2019/11/a-perfect-french-polish-finish

    DrewsBrews
    powered by beer
  • dcibeldcibel

    I've generally found that a single cap is "not good enough" when evaluating the driver's distortion, necessitating a very high crossover point which creates other problems. I often end up with a 3rd order filter on the tweeter, waveguide or not.

    DrewsBrewsrjj45
    I'm not deaf, I'm just not listening. https://discord.gg/h5SuNKDJfx
  • GowaGowa
    edited June 28

    https://www.rubiomonocoatcanada.com/

  • DrewsBrewsDrewsBrews
    edited June 28

    @Wolf said:
    Got a link to the pummice method?

    It seems basically you rub/sand the surface with the powder, lubricated with shellac. The resulting slurry of pummice and wood dust in the shellac fills in the grain. I'm interested since it seems like one of those things you could mindlessly do while watching TV once you get the hang of it. Shellac dries so quickly and you don't work with much volume at one time. So any mess should be limited to it drying on your fingers and maybe a little bit rubbing on clothes if working with a speaker in your lap. I'd wear junk clothes and cleanup with alcohol.

    This is what I watched to get a better idea of the minutia. Though I had to skip around alot because he carries on about techniques to not mess up the inlay work.

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