SOUNDSYSTEM SOUND-OFF - Event Date: 05 January 2014 |
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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How many subs are you bringing, though it was a 4x sub gig !? When Shabach went in there, we ran just 4x scoops, off 1x 32A supply, rattled the place to bits with smooth sub, and "apparently" smashed 30-40x glasses in the kitchen. |
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Global Depopulation - Alive and Killing.
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TONY.A.S.S.
Old Croc Joined: 21 February 2007 Location: United Kingdom Status: Offline Points: 6878 |
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You sure that wasn't the Turk throwing stuff around in the kitchen because he could no longer stand the noise
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peter_p
Registered User Joined: 22 February 2013 Location: UK Status: Offline Points: 122 |
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Must have been the high levels of 3rd order harmonic distortion from the scoops that set up a sympathetic resonance in the glasses.
No way could that be down to pure bass pressure. |
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peter_p
Registered User Joined: 22 February 2013 Location: UK Status: Offline Points: 122 |
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Do they also have a 'Nick the Greek, in that place.
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TONY.A.S.S.
Old Croc Joined: 21 February 2007 Location: United Kingdom Status: Offline Points: 6878 |
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I don't think that would be a very good mix.
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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Always plenty of people here, with armchair opinions. Move from comp, and come to Golden Palace sometime.. Then your opinion will be relevant. |
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Global Depopulation - Alive and Killing.
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peter_p
Registered User Joined: 22 February 2013 Location: UK Status: Offline Points: 122 |
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Seeing as you're around Tony, what's your take on the scoops and distortion debate. I think the problem is further up the chain and not the scoop itself. The first harmonic is the fundamental and contains no distortion. 2nd order harmonics are considered even harmonics , with the second multiple being most prominent. 3rd order harmonics are considered odd harmonics, with the third multiple being most prominent. A pure sine wave contains no harmonics other than the fundamental, a pure square wave produces only odd harmonics and a pure sawtooth wave produces both even and odd harmonics. Scoop are said to produce a warm and fuzzy kind of sound, which would indicate that they are high in 2nd order 'even' harmonics. But I'm not so sure. To me when a scoop is driven to very high levels the sound takes on a hard edge, which is more indicative of 3rd order harmonics. And if that's the case then I would surmise that it's the amp going into clip and producing a square wave, which would be high in 3rd order 'odd' harmonics. So is it the scoop itself that's producing distortion, or an overdriven amp that is squaring off that's to blame. One other fact worth noting is the difference between transistor output stages and valve output stages. Many think that valves only produce even harmonics and that transistors only produce odd harmonics. This is not true as both types of output stages produce both even and odd harmonics. It's just the ratio of harmonics produced by both types that sway it one way or the other. |
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peter_p
Registered User Joined: 22 February 2013 Location: UK Status: Offline Points: 122 |
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You need more mulled wine to see the humor in my post Ray. |
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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You're right.. Good to see you about.. |
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Global Depopulation - Alive and Killing.
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Heathrow_B_line
Old Croc Joined: 11 January 2006 Location: United Kingdom Status: Offline Points: 7344 |
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when you need to blow the bloody doors off, bring the full scoops! if you want the science bit go watch a pentene commercial lol |
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Produce a killer sound. Take no prisoners.
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peter_p
Registered User Joined: 22 February 2013 Location: UK Status: Offline Points: 122 |
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Ok that's it.
In the new year I will do full lumped parameter analysis to the following specs: Nonlinear system excited by a two-tone stimulus u(t)= 1.4U0 sin(2πf1t)+1.4U0sin(2πf2t) with the first excitation tone at frequency f1 and a second tone at f2, generating a state variable p(t)) subjected to a spectral analysis (Fourier transform FT) giving the spectrum (e.g P(jω)=FT{p(t)}). As, traditional harmonic distortion measurements only exploit the amplitude of the harmonic components. The phase of the higher-order harmonics is usually neglected because the interpretation is difficult. However, both phase and amplitude spectrum determine the waveform of the distortion in the time domain. The waveform of the harmonic distortion signal can be calculated for a sinusoidal stimulus at ω by applying the inverse Fourier transform to the harmonics in the complex spectrum giving the Instantaneous Harmonic Distortion in percent.
I will also analyze for wave steepening where at high amplitudes a sound wave propagates at the maxima faster than at the minima causing a gradual steepening of the wave front. This mechanism is found in horn loaded drivers. The nonlinear mechanism is basically a multiplication of the sound pressure with the differentiated sound pressure in each section of the horn. And also for throat non-linearity, which is the generation of turbulence's in the air flow that behave as sound sources causing broad band noise in the output signal. I'll measure a scoop, a front loaded horn and a reflex box, all using the same driver to eliminate possible variances in dc-displacement state variables and asymmetrical nonlinearities Kms(x) and Bl(x) The biggest question with this analysis is, steve b, .44, RX18 or ligwa. And should we carry out all measurements in hanger lane. |
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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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I dont need 63/3 Ray, the idea if we are tailing in is that everyone can have some more mains, it can all come from the same panel so we can spread it over the 3 phases instead of sticking a single 63A in, and hanging it all of one - which is far from ideal. Whether we will tail in remains to be seen, depending on how solid the supply is and if it is safe to do so. If not, i will need to find a second 32A as ill be using 2 racks, and each will need a 32A. sub wise - please remember my little reflex subs are a very different beast to a scoop, mini or otherwise. Maximum SPL with minimum drivers is not a prime concern of mine, we use larger numbers of drivers / subs for 2 reasons 1) sound quality 2) perceived throw outdoors and pattern control ( bass steering, cardioid arrays) where more sources gives you greater control the size of my stack will be smaller than most others, certainly that of a 4 x full scoop stack, and i dont use mid bass boxes - subs go straight into mid highs. we will use 8 subs as subs only, with 4 more running slightly higher, then will have a stack of 6 arcline 6 on top, with a few of my mini mid highs around for ambience.
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“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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