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Articles Tagged Charlie Hughes

  • Thursday, February 13, 2014
    psw study hall
    Charlie Hughes 02/13/14 05:16 PM,
    The specification of a loudspeaker’s sensitivity is probably one of the most common, yet perhaps one of the most misunderstood. It’s common to see the magnitude response of a loudspeaker system reduced to a single number as a sensitivity rating. This is perhaps at the heart of the confusion. One would think that this metric should give some indication as to how loud a particular loudspeaker will be when reproducing a signal. One may also think that two loudspeakers with… View this story
    Filed in: AVFeatureBlogStudy HallAVLoudspeakerMeasurementSound Reinforcement

  • Wednesday, July 31, 2013
    subwoofer
    Charlie Hughes 07/31/13 12:56 PM,
    I’ve heard the question “How do I align a subwoofer with a full-range loudspeaker system?” asked many times, and thought it might be interesting to delve into this to see if I could come up with an answer. The task of adding a subwoofer to a loudspeaker system to increase the low frequency bandwidth should typically entail three primary items. • The relative bandwidth of the subwoofer and the full-range system (crossover) • The relative output level of the subwoofer… View this story
    Filed in: AVFeatureBlogStudy HallAVLoudspeakerMeasurementProcessorSignalSubwoofer

  • Thursday, May 16, 2013
    square wave
    Charlie Hughes 05/16/13 04:56 PM,
    I’ve heard it argued by that square waves contain DC. How else could they have the flat top and bottom that make it square? Let’s look at a square wave and see what causes it to have its square shape. A complex waveform can be constructed from, or decomposed into, sine (and cosine) waves of various amplitude and phase relationships. This is the basis of Fourier analysis. A square wave consists of a fundamental sine wave (of the same frequency… View this story
    Filed in: AVFeatureBlogStudy HallAVMeasurementProcessorSignal

  • Friday, March 15, 2013
    all-pass filters
    Charlie Hughes 03/15/13 03:29 PM,
    We are all familiar (or at least should be) with a low-pass and high-pass filter. As the name implies, they pass one part of the audio spectrum while attenuating the others. They are the basis for loudspeaker crossovers. As with any analog filter there is phase shift associated with the change in output magnitude of these filters. Examples of these are shown in Figure 1 (below) as fourth-order Linkwitz-Riley filters. If we were to add the output of these filters… View this story
    Filed in: AVFeatureBlogStudy HallAVLine ArrayLoudspeakerMeasurementProcessorSound ReinforcementSystem

  • Wednesday, January 16, 2013
    limiter loudspeaker
    Charlie Hughes 01/16/13 08:39 AM,
    While it’s nothing new to place a limiter immediately in front of a power amplifier to keep it from clipping, there is more that can be accomplished with a limiter to squeeze a bit more low-frequency performance out of a loudspeaker while keeping it within its safe operating area. Most loudspeaker systems have a limited excursion capability. The voice coil and cone assembly can travel only so far before the motor strength significantly decreases, the suspension (surround and/or spider) reaches… View this story
    Filed in: AVFeatureStudy HallAmplifierAVEducationLoudspeakerProcessorSound Reinforcement

  • Monday, December 10, 2012
    target spl amplifier size
    Charlie Hughes 12/10/12 07:07 PM,
    In a previous article (“Loudspeaker Sensitivity”), I examined the topic of loudspeaker sensitivity and how it may or may not relate to the overall sound pressure level (SPL) produced by a loudspeaker. One of the conclusions of that article is that the SPL produced will be dependent on the spectral content of the signal driving the loudspeaker. Thus, having knowledge of the driving signal (i.e., program material) or being able to make an educated assumption about it may aid in… View this story
    Filed in: AVFeatureBlogStudy HallAmplifierAVLoudspeakerMeasurementPowerSignalSound Reinforcement

  • Monday, October 08, 2012
    tech talk
    Charlie Hughes 10/08/12 02:37 PM,
    To determine the input impedance of a device, both the voltage across the device and the current flowing into the device must be known. The impedance is simply the voltage across the device E, divided by the current flowing into it, I. This is given by the following equation: It should be understood that since the voltage, E, and the current, I, are complex quantities the impedance, Z, is also complex. That is to say impedance has a magnitude and… View this story
    Filed in: AVFeatureStudy HallAVLoudspeakerMeasurementSignalSoftwareSound ReinforcementSystem

  • Thursday, September 27, 2012
    loudspeakers, dsp
    Charlie Hughes 09/27/12 07:31 AM,
    While sound system operators have come to enjoy the considerable benefits of digital signal processing, it’s important to understand how these devices truly interact with loudspeakers. There’s a lot of cause and effect that sometimes gets overlooked, resulting in less than optimum performance, and leaving the operator scratching his head as to what’s going wrong. One particularly important aspect that is often overlooked is using a DSP to drive loudspeakers with a manufacturer’s prescribed settings (or other target drive function).… View this story
    Filed in: AVFeatureBlogStudy HallLoudspeakerMeasurementProcessorSound Reinforcement

  • Friday, June 03, 2011
    image
    Charlie Hughes 06/03/11 09:52 AM, 0 Comments
    While sound system operators have come to enjoy the considerable benefits of digital signal processing, it’s important to understand how these devices truly interact with loudspeakers. There’s a lot of cause and effect that sometimes gets overlooked, resulting in less than optimum performance, and leaving the operator scratching his head as to what’s going wrong. One particularly important aspect that is often overlooked is using a DSP to drive loudspeakers with a manufacturer’s prescribed settings (or other target drive function).… View this story
    Filed in: AVFeaturePollAVDigitalLoudspeakerProcessorSound Reinforcement





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