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About oohms

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  1. I wouldn't read into those figures. A lot of non reputable (and some reputable) manufacturers blatantly lie. Also for car speakers, they can use the on baffle or in an enclosed car sensitivity figures, which will be fairly different
  2. Don't change them. They look like they have been carefully chosen for that design, and the AD844 can be used as a special non feedback I/V that can't be substituted with any other opamp https://www.diyaudio.com/forums/digital-line-level/227677-using-ad844.html
  3. If you want it to be portable, it would be better to upgrade it. I have a shop vac and it's the noisiest vacuum i've ever used. We use a 30L milwaukee dust extractor at work and can easily have conversations next to it.
  4. I've had great luck with vintage philips speakers.. bought 3 pairs - 3 way floorstanders, 2 way wallmounted and a pair of small fullrange speakers They have all sounded really good - balanced and detailed. The floorstanders even have decent bass
  5. This is the best CD bolt on option from partsexpress: https://www.parts-express.com/b-52-phrn-1014-1-horn-10-x-14-bolt-on--299-2303 Using screw adapters does compromise the sound a bit (and i prefer bolt on drivers anyway)
  6. If it's not too late, wagneronline have both of those locally
  7. These are also another option: https://www.parts-express.com/selenium-st200-super-tweeter--264-348 I would order these together with the large horn + compression driver. The large horn will cross much lower and has wider dispersion, whereas the supertweeter crosses higher (think 4-5khz) and has a narrower overall dispersion of about 40 degrees
  8. This driver: https://www.parts-express.com/peerless-by-tymphany-dfm-2535r00-08-1-compression-horn-driver-2-4-bolt-8-ohm--264-1420 This horn: https://www.parts-express.com/b-52-phrn-1014-1-horn-10-x-14-bolt-on--299-2303 You typically want to avoid diffraction slots in the throat. This horn will need some EQ, but you can do it passively too (usually a parallel cap + resistor, in series with the driver) The combination will play down to 1khz, you can cross higher too, but the smaller decent horns on partsexpress are expensive
  9. I would make the same foam profiles but out of something like plywood laminated together to 50mm thickness - then use the templates to route/plane the curves, but otherwise saw them etc just like the foam
  10. Thanks! I have moved on to other projects, and if i was to do another K402, i would improve upon its design You're more than welcome to use any information here to do with as you like
  11. Built a quick and dirty pair of open baffle speakers.. window packers (from bunnings) make a great and easy way to rear mount speakers
  12. Where is a good place to look? I've never seen a pair for sale on ebay over here
  13. Or here: https://www.wagneronline.com.au/1-compression-horn-driver-8-polyimide-dayton/speaker-drivers/audio-speakers-pa/d250p-8-73044/991209/pd/ I haven't tried them but they look like great bang for the buck
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