edd9000

Super Wammer Plus
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    1,087
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About edd9000

  • Rank
    Listens to graphs.

Personal Info

  • Location
    Spalding
  • Real Name
    Edd

Wigwam Info

  • Turn Table
    SP-10, 401, Spacedek
  • Tone Arm & Cartridge
    Rega RB300/Rohmann
  • SUT / Phono Stage
    Black Cube
  • Digital Source 1
    PC
  • Digital Source 2
    LMS/Reaper
  • DAC
    Rosetta 800
  • Power Amp/s
    Pass Labs Clones
  • My Speakers
    DIY DSP Active 3 way
  • Headphones
    Modified DT-770
  • Trade Status
    I am not in the Hi-Fi trade
  1. september bake, off gathering thing

    Yes please.
  2. 300B Amplifier Schematic

    I would like one of his kits at some point. After the giant horns.
  3. 300B Amplifier Schematic

    http://vinylsavor.blogspot.co.uk/search/label/300B
  4. Exakt Design Beta impressions

    Ill emphasise, not audible to me, on my current setup. It seems to me with the tools to set time of flight available, it just makes sense to do it. Its only something I have messed with on my big speakers, but the mid/horn is pretty close anyway (I struggled to measure it) and at a 1.2khz crossover where the wavelength is about a foot so perhaps that's why its not so vital. Its something I will mess with on a more "normal" speaker once I CNC some Corian and plywood
  5. Exakt Design Beta impressions

    Space is on, though I don't see time of flight as a concern and never found it audible, it's nice that it does it so simply of course. It was more where it was placing the eq notches I need to mess around a bit more with it. While I agree dsp/active is better I just like to mess about. Imaging is pretty far down on my list of prioities to be honest, I mostly consider it an artifact. I spend most of my time listening to poorly recorded 70s rock, which doesn't have any phase information left
  6. Exakt Design Beta impressions

    No updates really, I got it pretty much where I want it to be after frustration of finding one of the tweeters was misbehaving. I should have the little bookshelf speakers I'm building built in the next few weeks, which I intend to build a passive crossover as well so it should make and interesting comparison. I do like exakt design a lot, I'm also rather impressed with the hardware, I'm not used to a two box system Subjective impressions are difficult, while a slightly different approach my system was already linear phase. However I do feel the tools in exakt design allowed me to get the horn sounding better. I also used DRC all the time which skews things. I need to play with space a little more, I'm not sure it likes my room/setup very much.
  7. FIR filters design software

    The drop down boxes are for normal EQ, for selecting minimum or linear phase, you don't need that for just adjusting the phase.
  8. FIR filters design software

    Its the paragraphic phase eq tab.
  9. FIR filters design software

    Rephase can adjust the phase only. It's in the eq part.
  10. Bit confused here, the phase should run along the 0 line. -180 is a speaker connected out of phase. Has it gotten confused with the impulse centre perhaps?
  11. Exakt Design Beta impressions

    Ah a bit lost now, I thought you meant from 3 ohms in parallel to 12 ohms in series. 4 way sounds like the best solution.
  12. Exakt Design Beta impressions

    It would sound bass shy as you will lose 6db in volume, you would need to turn up the gain to compensate.
  13. Exakt Design Beta impressions

    I was just going by the voltage mentioned earlier, 29v rails is pretty much 100w into 8 ohms, obviously its not all that simple, the outputs can rarely swing the full voltage, and it depends what THD the rating is at and how many channels are being driven etc. The current limit mentioned was 12 amps, That seems plenty even for 3 ohm loads but that's really a question for Linn, as I don't know how many channels that limit is for. (20v into 3 ohms, is 130w and 6.6 amps for example) Any 8 ohm driver will have a dc resistance of around 5-6ohms, which usually correlates to the lowest impedance the amp will see. Typically a 16 ohm driver will halve the power seen as few amps usually are not current limited at 8 ohms, unlike most of them at 4 or below. So if its 50w into 8, its very likely to be 25 into 16. I'd just try them in series first, if its not loud enough, try parallel assuming the amps are happy with 3 ohms. Not sure why you are worried about back emf, in fact the damping factor would be better wired for 12 ohms than 3, though once its above about 10 it doesn't matter much anyway, and id imagine the output impedance of the amps is nothing to worry about. What I'm really getting at here is watts don't really matter, its not all that useful. Amps function as a voltage source trying to maintain a voltage with a fixed gain of the input voltage, the power and current required then depends on the impedance of the driver at a given frequency. Knowing what voltage is available and max current is more useful.