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MickyMcD

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Posts posted by MickyMcD

  1. Havoc in IB Setup?

    in Subwoofers / Enclosures

    Posted

    Like many things, the meaning has simply changed over time. If you talk about an Active Speaker now, you usually mean a loudspeaker with it's own amplifier. It used to mean a loudspeaker with no frequency divider network and relied on Active processing.

    Frequency Dividing networks are now crossovers. Terms change to whatever is popular I suppose.

    Basslova, 10xVAS is the reccommended volume behind an 'IB' manifold.

    Cheers,

    Mick

  2. Horn > all?

    in Subwoofers / Enclosures

    Posted

    Hi mate,

    Although your question has been answered, I thought I would just chime in quickly.

    A horn in terms of low frequency is an acoustical impedance matching device that attempts to make use of an exponentially expanding airspace to maximise output over a set bandpass. Low frequency horn enclosures are not easily designed and are not usually designed to operate in single units. Multiples of two mouths are common with horn subwoofers often making appearances as two-a-side, four-a-side, eight-a-side etc.

    The lower the low frequency cutoff for the system, the longer the horn path. One thing to remember is that a horn does have acoustic resistance, and that acoustic resistance can be measured electrically as resistance on the diaphragm. Some horn paths will offer as much as two times the impedance at some frequencies and going below the low frequency cutoff can result in a MASSIVE drop in impedance (cough Labsub cough), sometimes allowing your amplifier to drop a metric dicktonne of power into the low impedance on the cones below resonant frequency, tearing them apart.

    Horn enclosures have a myth that they form the wave further out from the box than a normal front radiating speaker. Complete bullshit as the pressure difference that is sound begins at the incident, which would be the cone on the loudspeaker. They often do, however, show phase and time domain anomalies close to the loudspeaker that give the perception of decreased volume. Given a distance away from the cluster, the mouths sum cohesively and gain amplitude. Ed Lester has also very correctly pointed out that horn mouths do not want to be in a small environment, no smaller than 3π (3pie), although some do not even like 3pie!.

    Cheers,

    Mick

  4. Thoughts on this computer build?

    in Computer Talk - News, technology, advice

    Posted

    Looks like a great build! Intel and Nvidia all the way! Don't let others try to sway you to other companies like AMD and ATI it's just cheap junk.

    Your fierce and misguided brand loyalty restricts you from ever having a professional opinion in Information Technology. AMD and it's subsidiary company ATI design and manufacture a range of products from low power XGA graphics products to multiple processor server solutions. ATI as a company saw a slump in technologies and profits during the 1900XT-2900XT series, although now see regular profit margins competing with and occasionally exceeding nVidia due to a breakthrough in die yields as well as a break away from Moore's Law.

    I would like to think the AMD processing power in my workplace server room is not cheap junk. If it was, it would not be there. I am not an ATI fanboy, nor am I against Intel or nVidia products in any way, shape or form as I will specify whatever product will suit the task. That said, I discourage your biased opinion.

    OP, good luck with your PC. You certainly have enough horsepower to do.....well....what can't you do PC wise with power like that?

    Cheers,

    Mick

  6. Fellow sysops, sysadmins and techs

    in Computer Talk - News, technology, advice

    Posted

    Should have just sent it to me. I loves me some laptop and desktop work. Electronics and car audio are my thing. Might take me time sometimes to figure out whats wrong but I always get it. I have been working on laptops, desktops, electronics, and car audio on the side.

    I would have happily sent it to you. In a department that should have eight to ten full time staff, we have two, one being me. It is much more cost effective for me to jump on them a bit at lunch break, chuckle heartily for a while then dump them. I have left the scan going over the weekend, hopefully the count has gone up by monday. I'm thinking 1100 to 1200 sectors 25% in...

    n8ball, what do you do for IBM?

    Cheers,

    Mick

  10. anyone going to see Roger Waters-the Wall?

    in Off Topic - Random, Misc posts - the forum "Junk Drawer"

    Posted

    I remember not long ago Roger Waters came to Australia to do a show, and the same night David Gilmour was playing in a competing venue...

    Dave had more punters. Good laugh had by all. Though I would highly encourage anyone who is thinking about seeing this show to see it. By all reports it is awesome.

    And Quick, did you know that for most of The Division Bell tour (after Waters' departure) they used a pair of PM3000's and a PM4000 just for FOH? One PM3000 for drums, a PM4000 as the master console and a whole 52 frame PM3000 just for the quadraphonic tape returns and the massive pile of synths used. And the PULSE concert was done entirely on Turbosound Flashlight + Floodlight? One of the best concerts, spatial imaging wise, was entirely point source. And some people say you can't use trap boxes. Phooey.

    Cheers,

    Mick

  13. I may have just killed my sub

    in Subwoofers / Enclosures

    Posted

    if it does end up being your tinsel lead it means your gain is to high... dont ask me how i know this...

    You don't know this. At all. Who's to say it wasn't a glue failure? Flux left over from wave soldering? Heat stress? Mechanical failure? Manufacturing fault? Unless you have physically diagnosed the issue, how can you say '...it means you gain is to(sic) high...'? Tensile leads fail for many reasons.

    Also, say he has +30dB of gain at the power stage. There may be a reason for that. Possibly to make up for a low signal, a fault etc.

    It seems a growing trend that everyone knows everything about a system from a few photo's or lines of text on a forum.....

    Cheers,

    Mick

  14. any DJs out there?need help with setup!

    in Off Topic - Random, Misc posts - the forum "Junk Drawer"

    Posted

    Me personally, I'd stick with the MRX515. I have never quite liked the idea of the dual 15" cabinet. Too heavy, can't fly them, can't fly them on a pole etc. I still think the MRX515 Loudspeakers (15" loudspeaker with 2" HF device) coupled to MRX518 woofers will give you one of the most versitile and smooth sounding reinforcement systems in that price bracket.

    Chuck two two amplifiers on the paper and one on the titanium and hang on to your hats.

    Cheers,

    Mick

  15. any DJs out there?need help with setup!

    in Off Topic - Random, Misc posts - the forum "Junk Drawer"

    Posted

    Like I said in my PM;

    Bi-amplifiy the MRX cabinets. The MRX515 does appreciate an active corssover network, the DCX2496 I specified will be able to handle the filtering, dynamics and time alignment required to do this properly. A pair of MRX sub-low speakers will do you fine, and give you the option of using one, two, or no low frequency bins depending on the size of the venue, target audience etc.

    I would stay away from the PV series of loudspeakers. They are a far cry from the old SP series that gives Peavey it's 'Can't kill it with an axe' motto.

    So;

    3 x EP2500 (or similar)

    2 x MRX515

    2 x MRX518

    1 x DCX2496

    1 x 10RU Rolling Rack

    4 x SpeakON leads (IMPORTANT - THEY MUST BE FOUR CORE AND HAVE NL4 CONNECTORS)

    This gives you a Front Of House system with linearity and a wide frequency range with less time smear than a standard FOH setup. It gives you flexibility, power, and reliability. Plus, the little orange JBL logo gets you gigs. I don't agree with it, but it does.

    You choose your input source.

    Cheers,

    Mick

  16. want a nice set up

    in Pro Audio / Home Audio / Home Theatre

    Posted

    I dont even want to look at how much that would run. Knowing you it will hurt my feelings :D

    Hurt your feelings and your wallet. That's the beauty of working in a company; someone else pays the money, you get to use them. Win-win!

    lol Mick recommending some Meyer. Not too much is cheap about them, but they're pretty nice.

    Hey, I like my Meyer's. And I'm hurt. Call my meyers 'pretty nice'. Ima go have a sulk in the corner now.

    Cheers,

    Mick

  21. Turns out 4890's are flammable

    in Computer Talk - News, technology, advice

    Posted

    I just got a sapphire 4890.... gulp

    Should i be seriously concerned? i have pretty good air circulation...

    Man, until they gave up the ghost, I was gobsmacked by the 4890. Grab the TechPowerUP GPU tool, as the 4890 has the VOLTERA chip that allows software GUI control of memory and core voltages. Running 1.45V to the core and 1.5v to the memory, I had the core clock at 1050MHz and the memory at a blazing 1200MHz. They really ripped up man.

    My cards just didn't like the watercooling conversion. Possibly a short, ESD damage, who knows? They were on fire, good enough answer for me. Enjoy your card man, they really are good cards. Clock like hogs.

    Cheers,

    Mick

  22. Nice sub for home theater

    in Pro Audio / Home Audio / Home Theatre

    Posted

    Thanks a lot mate! And yea I love them, treossi. I do have one question for you, Mick... What do you mean by huff and puff for the tuning? Do you mean it will be extremely difficult or just slow or what? Sorry I'm just slightly confused! It's been a long day (dealing with family "function"), and I'm kinda out of it, while playing MW2, lol.

    It will have lots of port noise at tuning.

    Cheers,

    Mick

  25. 1/4 wave attempt

    in Subwoofers / Enclosures

    Posted

    In a tline you want the sub as far away from the port as possible, just like every single sub box. 45 all corners and make sure you dont have any flex in the box.

    Danley style tapped horns and Meyer SB1000 type enclosures require the driver to be coupling with the mouth of the vent. Not all enclosures require spacing of the mouth and driver.

    Cheers,

    Mick

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