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About Auracle

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  1. Hobart GTG late september EOI

    Hey Linc, Just a thought bubble here.... This is a fair crowd already and that's fantastic, but you may want to consider converting that pool into sound lounge to accomodate everyone comfortably. I'm guessing that it will be converted into a large ice bucket instead. Either way it will be impressive.
  2. Maybe I should start another thread on "how to make alcohol whilst listening to background music class". -this is Brian's thread afterall, and we really should get back on topic.
  3. Hobart GTG late september EOI

    Sorry guys for being a bit slow on the uptake. I no longer seem to get email notifications. Haven't performed any setting changes either. Pencil me in! @djb Looking at recent photos elsewhere on SNA, are you sure you're not a local? Shall we warm up the seat for you?
  4. Looks like I've made a rod for my own back. Running an educational GTG as compared to a show-and-tell (and drink) format. Does anyone in SNA land know if a gtg has been run along similar lines, or will this be the first? If anyone has a suggestion for formats, let us know. Does SNA also get a portion of my apples?
  5. Thanx Linc. I'm OK to take up your kind offer. An idea:- If anyone else wishes to attend this class, let us know so we can accomodate numbers. (aka GTG) -please bring an apple for the teacher though.
  6. No tin hat necessary, -you have proven your mettle (no pun intended). I remember somewhere that your driving situation is somewhat curtailed? If so, we just need to arrange a convenient time. I'm actually "working" up north of the state until next week. I'm also dropping in and annoying poor Matt.( Dunno why he hasn't told me to P!$$ off yet.) Cheers
  7. It definitely does seem like it's time to make a live appearance. I do need to find my whiteboard however. I still haven't unpacked my gear due to red-tape. And, since you asked nicely, I will give a primer on attenuation. Definition: "the reduction of the amplitude of a signal, electric current, or other oscillation". =>The DC resistance component of an inductor is but a small but inclusive part of what makes up attenuation when placed in an AC circuit. The coil "resists" the directional changes of Alternating Current as a function of frequency. It's value is calculated using complex number mathematics, and contains an angular component. It's name changes to "impedance" and notation is usually "Z". A "T" filter is "TT" is..... and so on... I also like your parting comment. I should listen to more music before that nutter reduces this world to a smouldering radioactive wasteland. Hope to see you soon.
  8. I've been agonising on how to give you an informative response, since I'm not sure on your depth of knowledge pertaing to filter network theorems and associated mathematics. I will start with a few basic facts hopefully without getting too heavy. Filter networks usually come in the form of T or TT (pi). The quasi parallel sections will tend to want to "resonate" and form peaks (Q) and troughs (nulls) before the attenuation commences, -IF, of course, that is what the application requires, otherwise, the incorrect component values have been chosen. If the application is audio, then that peak/trough should not be a desired outcome. It is actually distortion, and it is audible. Some manufacturers use this trick on cheap subwoofers (they have a wild and woolly sound when played on their own). Consider this; if you are attenuating, how can you have more out that what you are putting in? These types of issues forced me to formulate calculators that allow me to instantly see the changes in curves for each component swap. This has made my crossover design process so much easier and quicker with not many corrections. I can also tailor-make stepped slopes if required. The other bits of info I can offer are:- * With large amplitude signals, metalically cored inductors will saturate and cause audible distortion. Try large air-cored units instead (place them outside and make them a feature). * Ruler flat frequency responses will never be achieved with passive crossovers. Only digital manipulation can achieve this. * If someone thinks they can hear variations less than 2dB, they are deluding themselves. Yes, it's a harsh reality, and it gets worse with age. Consider that the tolerances of the components will give you that alone. --------------------------------- Some of this information you may like, and some you will not. But they are the results of my experiments and experiences, and will stick by them. These days I realise that the time I have left is precious and prefer to enjoy listening to the music ( yes, yet another cliche') on a nice system rather than the system. Also, having just returned from a developing country, one sees things that put our first-world lives into perspective. I think most readers will understand what I mean. So yes, spend on what makes you happy, but always know your limitations. Cheers
  9. Never a truer statement been uttered. 4th order passive crossovers will always severely dampen driver output. Bass drivers require current to "breath" the music into life. Each reactive component added will suck out its' share of power, so the driver will end up with what's left over. This is why with multi-driver speakers, the active miniDSP/DEQX/multiamp setups have it all over the passives in regards to ease of construction, electrical and acoustic parameter corrections. This also explains why creatures like this can slap something together in no time and make it sound decent, whilst purists like us will curse endlessly. Disclaimer: Any references to persons passed or living that feel that they resemble any of these remarks should look in the mirror less often. Should offence be taken by any remarks held within, was sheer fluke on my behalf, and bad luck on yours... Honey! Have I taken my medication tonight?
  10. Thanks for directing me to this page Brian. Good to see that you are active again. I have read this page and realised that I may have been able to help you. Before I left my previous relationship, I was researching spatial information and what exactly constitutes imaging. I also found literature denoting that most "positioning" cues are held within the lower registers. So yes, never mono your bass! And believe it or not, the bass drivers should be positioned outermost, mid drivers next to them, and high frequency drivers innermost (giving a more mono setup, but really isn't because of the wavelengths involved and how the HTRF actually works) Now, with the XO work. It's one thing to calculate from a book, but how it's interpreted into real life listening is the "magic" part. Microphone measurements help, but you must really understand what is going on. Done "correctly", will result in a lifelike representation of the program material, compared to the dullness that normally occurs when you follow 'the book'. You will also notice that the crossover will resemble nothing like what is recommended from text. Mind you, these discoveries have taken many years of R & D, and I usually keep them to myself as the "experts" will shoot you down for straying from the accepted norms, even after agreeing that the sound is closer to the recorded material. Go figure! Anyway, the point was, that it's OK to use mismatched (sensitivity) drivers. Attenuation resistor placement is vital though. If you wish to talk further, I can PM you my contact details.
  11. Open Invite Lounge, Tasmania

    This GTG has been one of the most informative and entertaining meetings I've attended over my lifetime. The hospitality shown by our host and partner has been second to none, so a sincere thank you for the wonderful cuisine put in front of us and making rooms available for our overnight slumber. Always good to meet new faces and any reservations quickly converted to camaraderie. The quality of conversation was of a very high standard and everyone learned something new (not always about audio). The photos should reflect the variation in characters present that made for a very enjoyable weekend. The equipment was as varied as the characters themselves, ranging from DIY, antique, to cutting edge commercial amplifiers. The loudspeaker range was just as varied. The music list was extensive and also varied over an extreme spectrum. Reluctantly we had to part ways. This weekend will not be easily forgotten. It was a privilege to attend and hope to attend many more.
  12. Open Invite Lounge, Tasmania

    Hi Matt, TomYum Goon soup sounds yummy. What does a browser taste like? This 50 watter has had a lot of interesting descriptions for its sound. I'll leave it at that, -no clues either. What type of tin hats should we bring?
  13. Open Invite Lounge, Tasmania

    Did you want another 50W/ch amp to compare to? (No trouble throwing it into the back of the car.)
  14. Open Invite Lounge, Tasmania

    Sad to hear these stories. I'm interested in hearing about your tech endeavour Matt, to see if there is a work-around and stretch your income stream for a few more years. Do you have an estimate at this stage of numbers for the 24/25 th weekend? Trying to judge whether it's better with two cars or a mini-bus from Hobart.
  15. Open Invite Lounge, Tasmania

    Sorry, forgot about the mushrooms...