Recent content by vainajala

  1. vainajala

    Passive audio filters

    Hello audioguru, The graph is frequency response of the prototype speaker, measures at approximately 1 meter away. Do you think it's totally messed up? How should 2-way speaker's phase response look like? Your comment made me suspicious to my measurements, so i'll have to re-measure to see if...
  2. vainajala

    Passive audio filters

    Thread resurrection... 8) 8) Lately I've been busy trying different cross-over types, and found out that 2nd order Bessel filters, crossing at 2 KHz, seems to work quite well. I built a prototype-speaker and measured it, here is the resulted far-field frequency response. Only bad thing is that...
  3. vainajala

    Lowpass for subwoofer -project

    ...and another pic... ::)
  4. vainajala

    Lowpass for subwoofer -project

    Forget the hat, those are way more important things! But is it really necessary to operate your woofer at its maximum SPL level...? I'm sure it will play gently too, just watch out for over-turning that volume knob! :) ~~~~ I came to think about using 24dB filters for both lowpass &amp...
  5. vainajala

    Lowpass for subwoofer -project

    Wow! :o Be sure to hold your hat while powering those ;D
  6. vainajala

    1w Luxeon led/s driver for use in car?

    Hello Brenn Which color Luxeon's are you going to use? Red Luxeon has forward voltage of 2,85V and blue has 3,42V. Four red Luxeons connected in series would have forward voltage of 11,4V. Simplest method for dropping voltage would be a series resistor. (13V-11,4V)/0,35A = 4,6 ohm => 5,6...
  7. vainajala

    Lowpass for subwoofer -project

    I sim'ed the sealed+linkwitz alignment and a normal vented box with WinISD. Both use 50L box and the Linkwitz transform circuit's -3dB point is set to 28Hz. That way it goes quite low and has maximum boost of only 5,5dB. Both use 2nd order Butterworth 65Hz lowpass filter. Since I don't know...
  8. vainajala

    Lowpass for subwoofer -project

    Audioguru: I don't know how long Xmax it has, because I don't have any spec-sheets or instructions. This is most propably an automotive 4ohm woofer, so I guess the manufacturer has concentrated a bit more on the glamorous appearance, than the sound itself. It is almost too "pretty" to hide in...
  9. vainajala

    Lowpass for subwoofer -project

    I'm 99% certain, that I'll be using this woofer. I got it from friend for 35 euros! :D Now I need only to measure its parameters with Speaker Workshop...
  10. vainajala

    Passive audio filters

    audioguru: If a speaker manufacturer defines itself High-End grade, and then puts a wrong value inductor to their production speakers, does not seem very "High-End" to me. In fact, it's a cardinal mistake. I wonder if the customers (and you) got their money back, because of a "bad" product? Do...
  11. vainajala

    Passive audio filters

    I don't believe it's because of room reflection, tried in very different positions and curve looks almost perfectly same. My old speakers just simply suck. Your speaker-measuring arrangement seems cool. Are you using a laptop-computer for measuring? What program you prefer? I use Speaker...
  12. vainajala

    Lowpass for subwoofer -project

    No, the SLS line is mostly meant for indoor-use so only 8 ohm version is available. and I'm not gonna wind new coil into it. ;D You're right, 2dB difference might not be worth that increased complexity at output stage...
  13. vainajala

    Passive audio filters

    <bump #2> Here's the frequency response (20Hz - 16KHz) of my old speakers, I just measured it with Speaker Workshop... The peak at 50Hz is propably mains voltage hum. I think below 35Hz is mostly junk too. They have 8" woofer and 1" dome tweeter, and have no cross-over. Just bipolar cap...
  14. vainajala

    Help me about a PC Osciloscope

    I once tried this freeware program, and it actually worked quite well with soundcard input... http://www.saunalahti.fi/elepal/scope3.zip
  15. vainajala

    Lowpass for subwoofer -project

    In my opinion, 8" woofer is rather large for main speaker use, but quite small for sub-woofer use. But bigger cone size doesn't always mean better sound quality. :) About EQ: I think room acoustics will help somewhat with lowest frequencies. If it doesn't work that way then I might consider...
See more
Top