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Bolan-Boogie

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Posts posted by Bolan-Boogie

  7. Led Effect New And Boxed For Sale !

    in Disco Equipment For Sale & Wants Area

    Posted

    SORRY I HAD TO REPOST THIS LINKS WERE DEAD IN LAST POST ...SORRY !!

     

     

    I have one of these made by Varytec BRAND NEW Full DMX and boxed with instruction manual (never used) due to a change in rig set up. The coverage is massive. Its pretty much the same as the Kam Diamond or Chauvet vue 6.1

    Spec

    1. 6 DMX Channels.

    2. Beam Angle: 110

    3. 252pcs led(108R,72G,72B)

     

    Yours for £65 & delivery

     

    Link here

    http://au.alibaba.com/product/308133802-LE...tage-light.html

     

    Chauvet Vue 6.1 here

     

    http://cgi.ebay.co.uk/Chauvet-Vue-6-1-6-Ch...=item483e5eb220

     

    Kam Diamond here

     

    http://cgi.ebay.co.uk/LED-DIAMOND-NEW-LED-...=item43a402cebb

  10. Platinum Notes

    in DJ & Karaoke Software

    Posted

    I know this is reviving an old thread, but I have been absent from the forum for a while due to health problems.

    I have used Platinum Notes now for over 2 years, I find it a excellent piece of software. It does so much more than MP3Gain etc, it seems to give a new lease of life to old recordings and that extra bit of Omph to recent mp3 files. Yes it's expensive but worth every penny in my honest opinion :D

  14. Amp Advice Please

    in Techie Talk

    Posted

    HI Guys

     

    is there any negatives in doing so?

    will my speakers sound C:cense:p because of this switch.

     

     

    Yes that's exactly what I'm saying :D

     

    DJH asked if there were any negatives in doing so, I'm trying to point out various negatives even though we are going around the Mullberry bush to get there, even though it's interesting debate :dukesy:

     

    To simplify terms and not get all testicle (oops i meant Technical :ads: )

     

    I would stay with the theory its better to have too much power than not enough, as long as it's used correctly. :amen:

  15. Amp Advice Please

    in Techie Talk

    Posted

    As a rule, I always aim to have more the RMS output necessary - meaning that if the woofer is rated at 400W RMS, I use an amp that produces at least 600W RMS (Headroom) at the impedance I will be running the speaker at.

     

    There are a few reasons to do this. One is that the amp puts out less distortion, less heat, and lives a longer life when working less hard. Think of yourself trying to paint a detailed picture right after you've ran a marathon, or spent an hour power-lifting at the gym. Its pretty tough to do any kind of quality work when you're exhausted from running full-bore. Now if you spent a liesurely day sipping a beverage by the pool before trying to paint, the results would be much different. You'd be alert and able to focus on the job at hand. Same goes for your amplifier. A larger amp working below its full potential is much happier than a small amp being run full-bore at all times.

     

    Another reason is that the woofer will take more power than its RMS rating, provided its a clean, unclipped sine wave. This translates to increased volume from your woofer, which you claim you want. You can always adjust the gain to produce the desired output level - just because the amp makes 800W, doesn't mean you need to set the gain so that its making full power.

     

     

  16. Amp Advice Please

    in Techie Talk

    Posted

    You are correct when saying that having headroom on an amplifier will normally avoid clipping BUT,

     

    Spinner is also correct of course when he says that if the amp is run within its parameters then you will get no clipping and not damage the speakers.

     

    And what are you talking about when you say that if a speaker has a higher rating than an amplifier it will request more power than the amp can provide thus sending it into clip?

     

    Sorry Spinner that post was obviously not directed at you,and I must learn to type faster!!!

     

     

    Hi Andy,

    If you are not putting enough power into the speaker (obviously not enough working on the theory of 4 speakers at approx 300 watt rms) then you are not moving the speakers enough to keep the speaker coil cool resulting in a gradual burnout of the voice coil.

  18. Amp Advice Please

    in Techie Talk

    Posted

    Patronising or not I could have written the same post, if it was relevant to the point in question. I knew all that

    My comments were made on the basis of using the amp properly.

     

    I said that so long as the amp isn't overdriven ( or put into clipping) there won't be a problem.

     

     

     

    Hence my reply, If the amp is going to be running tops & bins like the original question states then there will be clipping issues. 300 watts rms per channel into a potential 600 watt speaker rating. in my experience this is always going to clip.

  20. Amp Advice Please

    in Techie Talk

    Posted · Edited by Bolan-Boogie

    I will certainly try for you Spinner :D :D

     

     

    The underpowered amp can damage speakers by "clipping".

     

     

    When an amplifier is pushed to create a signal with more power than its power supply can produce, it will amplify the signal only up to its maximum capacity, at which point the signal can be amplified no further. As the signal simply "cuts" or "clips" at the maximum capacity of the amplifier, the signal is said to be "clipping". The extra signal which is beyond the capability of the amplifier is simply cut off, resulting in a sine wave becoming a distorted square wave type waveform.

     

    Underpowering a speaker is likely to damage the voice coil due to the excess heat created by distortion. This distortion, called clipping, is created when the amp is not able to supply the power demand when the volume is turned up.

     

    The signal going to the speakers from the amp is AC (Alternating Current).

    (the voltage is alternating too, but they have to call it something ).

    This means that to play say a 100Hz tone, the amp will alternate the output voltage (and hence current) between say +12V and -12V (or +1.5A and -1.5A) 100 times a second (the actual voltage/current level depends on the volume you select and the impedance of the speaker, which I've assumed to be 8ohms in the above example).

     

    Now, a powerful amp may be able to deliver a maximum of +/-100V across a speaker, or +/-12.5A into it, where a low powered amp can only deliver +/-40V or +/-5A.

    What happens if the low powered amp tries to deliver +/-80V or +/-10A?

    The tips of the voltage or current wave are simply "cut-off" or "clipped" - for the duration of the "clip", the voltage/current is steady, which means it's DC (Direct Current - ie not alternating). This is very bad for speakers, especially tweeters (you may think the series capacitor in the crossover would protect the tweeter from DC - it won't in this case, as essentially what you have is pulsed DC, which a capacitor will pass).

     

    Imagine a sine wave, and simply slice off the tips - you'll have what's beginning to look like a square wave - the flat bits now at the tops and bottoms of the wave are the DC component.

    DC can burn the voice coil out (if long enough in duration) - and can cause it (and hence the cone) to move too far, which can cause mechanical damage to the speakers motor assembly.

     

    As an amp is turned up closer and closer to its maximum level, the level of distortion increases. So the idea is that if you are using a underpowered amp and have to turn it up near its max to achieve the level of loudness you desire, it is working real hard to reproduce the waveform accurately and may clip. That is why it is better to have an amp with greater power than you will actually need.

     

    A little guide on Impedance (for those who may not understand)

     

    An amplifier is not expecting to "see" a certain load and they are not built to drive a certain load. They have power values stated at certain standard impedances and have a minimum impedance which they are capable of driving, which is related to the amps ability to dissipate heat. An amplifier will generate more heat the lower the impedance attached to it. A higher impedance will make it run cooler not hotter.

     

    Image pushing a big rock along the ground. The size of the rock relates to impedance and the effort required to move it relates to the amps power. When you have a big, heavy rock (8 ohm for example) there is more resistance to movement and you have to push hard and it moves slowly (low power output). If you halve the size of the rock (4 ohm) you don't have to push so hard and you can push it faster (higher power output). Halve it again (2 ohms) and you can run with it! (max power output). The faster you are moving, the more heat you produce. If you get to the point where you are running so fast you cannot keep cool, you will overheat and die.

     

    This isn't supposed to sound patronising, its just an easy way to simplify certain principles.

  21. For Sale Pair Of Qtx Atlantis Led

    in Disco Equipment For Sale & Wants Area

    Posted

    Absolute Giveaway !!

     

    £185 THE PAIR WITH FREE DELIVERY

     

    PAIR of QTX Atlantis LED with FREE DELIVERY

     

    They cost £189.99 EACH

     

    Link and video

     

    http://cgi.ebay.co.uk/Atlantis-Flower-Soun...=item5d2627e29e

     

     

    These were purchased new for 2 extra special corporate gigs over xmas and new year, where massive lighting coverage was needed. Yes only used twice !

     

    Basically the same as revo 3 and Acme impossibled

     

    BUT MUCH BRIGHTER............These have 496 LED's instead of the 392 in revo 3 etc

     

    These are in Mint condition as stated only used for 2 gigs

     

     

    Be Quick !! :D

  23. Amp Advice Please

    in Techie Talk

    Posted

    No it will be seriously underpowered, Please read original post again.

    He would be running 300 watts per channel into a pair of Peavey Pro 15's (300 watt rms) this would be fine 300 watts of amp power per channel into a 300 watt rms speaker (No problem) BUT and a VERY BIG BUT at that he states with bass boxes....................So where is the other power coming from for the bass cabs ?

     

    If it is from the same amp then its " No way Jose"

     

    Also something to consider is the 600 watt amp is 600 watts into 4 ohm (I would Imagine) now Peavey do the Pro 15's in different models some are 8 ohm some are 4 ohm.

    Now if they are the 4 ohm version you will get the full 300 watts per channel into the speakers, however, if they are the 8 ohm version you will only get about 175 watts per channel................Seriously underpowered.

     

     

    I would definatley give the 600 watt amp a miss, especially if your running 8 ohm pro 15's ..........This is without even considering bass bins.

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