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But if we focus on eliminating every artifact that we can measure, we can quickly converge on a solution that approaches sonic transparency. If we just listen, redesign, then repeat, we may arrive at a solution that just masks the artifact with another less-objectionable artifact.
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When we hear something we cannot measure, we are not doing the right measurements. Meet Ultimate Ears BLAST and MEGABLAST, portable Wi-Fi/Bluetooth speakers with bold, immersive 360 sound and Amazon Alexa hands-free voice control built rig.
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We have to tell it exactly what to measure and how to measure it.
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An APx555 test set has far more resolution than human hearing, but it has no intelligence. But since listening tests are never perfect, it’s essential we develop measurements for each artifact we identify in a listening test. "At Benchmark, listening is the final exam that determines if a design passes from engineering to production. The interview accompanies Paul's review of the LA4 in the December, 2020 issue of TAS. Paul Seydor of The Absolute Sound interviews John Siau, VP and chief designer at Benchmark Media Systems. Independent Control of Headphone and Line Outputs.One Unbalanced THX-888 TRS Headphone Output.One Balanced THX-888 XLR4 Headphone Output.256-Step Stereo Volume Control - Headphone Output TERATON ALPHA is AKs ultimate Sound Solution to produce audio playback that is close to the original sound through the use of effective power noise removal.256-Step Stereo Volume Control - Line Output.Maximum Input and Output Voltage, 20 Vrms (+28 dBu).Output Noise - 3 dB Bandwidth exceeds 0.1 Hz to 500 kHz.Frequency Response - 0.003 dB at 10 Hz, -0.001 dB at 20 kHz.
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The AHB2 power amplifier and THX-888 headphone amplifier have similar specifications they are virtually noise free (SNR > 132 dB) and distortion free (THD 135 dB, unweighted, 20-20 kHz Given the extraordinary performance of these THX-AAA amplifiers, this would not be an easy task! Required Specifications Our volume control would need to have lower distortion and lower noise than either of these amplifiers. We wanted to be able to place this volume control in front of our AHB2 power amplifier or in front of our THX-888 headphone amplifier board without diminishing the performance of either device. Our goal was to produce an analog volume control with the highest achievable transparency. The volume controls feature high-precision metal film resistors, gold contact relays, and fully buffered inputs and outputs. Each has a +15 dB to -122 dB range in 0.5 dB steps. One volume control is dedicated to the line output and one is dedicated to the headphone output. Together these form two fully-independent, fully-balanced stereo volume controls. The greater the path length difference the greater the barrier insertion loss performance. Typical open top barrier performance is a reduction of 15 to 20 dBA.Benchmark has introduced the new HPA4 headphone/line amplifier with four 256-step relay-controlled attenuators and four 16-step relay-controlled boost amplifiers. This relationship is shown in the figure below. When open top barriers exceed the height of an air cooled chiller, consideration needs to be given to manage airflow and impact on operating efficiency and the unit power consumption. Full enclosure path treatments are required when more than 20 dBA of reduction is needed or where the location of critical receivers are at an elevation higher than the chillers. Overall, acoustic performance will be determined by the height of the barrier enclosure in relation to the source height and the receiver height. An effective path barrier should provide minimum STC-30 and NRC 0.85 performance. Surface mass provides sound transmission loss rated as a single descriptor called STC (Sound Transmission Class). A barrier’s ability to absorb and dissipate reflected sound is rated as a single descriptor called NRC (Noise Reduction Coefficient). An effective open top path barrier should provide minimum STC-30 and NRC 0.85 performance.