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Bubo

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  1. Early digital had a greater quantization error, and was clipped or compressed to fit the CD limits 20Khz top end. MP3 is the wholesale slaughter with psycho acoustics added in for the missing music.... If you have a quality analog recording, and digitally encode it at high bit rates, the quantization saw tooth is certainly much less pronounced, although even with in finite processing speed will always be there. The encoding and decoding algorithms also vary greatly in their effect. It would be interesting to measure the frequencies above the CD limit on one of their vinyl records to see what is there..... I believe an analog master encoded with current state of the art hardware and software, can sound as good or better than pure vinyl. The truth in labeling remains a requirement..
  2. Different frequencies create different effects in the brain depending the the desired effects. This has been studied extensively and is well understood. Brainwave entrainment, also referred to as brainwave synchronization or neural entrainment, refers to the observation that brainwaves (large-scale electrical oscillations in the brain) will naturally synchronize to the rhythm of periodic external stimuli, such as flickering lights,[1] speech,[2] music,[3] or tactile stimuli. As different conscious states can be associated with different dominant brainwave frequencies,[4] it is hypothesized that brainwave entrainment might induce a desired state. Researchers have found, for instance, that acoustic entrainment of delta waves in slow wave sleep had the functional effect of improving memory in healthy subjects.[5] wiki General Concepts and Formal Models of Entrainment by a Periodic External Drive One property of oscillating elements commonly found in nature is that they are self-sustained and dynamic (e.g., Glass, 2001; Pikovsky et al., 2003). Such oscillators can be perturbed by an external force. If this force is periodic, the natural oscillation may then become synchronized to the periodic event. Synchronization here means that the oscillating element starts to cycle with the same period as the external force. Or in other terms, the oscillator becomes entrained or locked to the external event. In this context, synchronization, entrainment, and locking are synonymous1 (Pikovsky et al., 2003). We will use the term entrainment to denote synchronization to a rhythmic stream (or train) of external events. https://www.frontiersin.org/articles/10.3389/fpsyg.2011.00170/full
  3. How's the world treating you Missing you
  4. In this order, isolate the problem: Inspect the cabinets for defects or leaks. Try reversing the speaker wires LR RL If the problem moves, it's the amp, pre amp or source Eliminate the crossovers Disconnect and test OHMs for each driver and write down the numbers Driver numbers should be nearly identical by type, tweeter, woofer, mid horn Remove and swap the crossovers, and see if the problem moves with the crossover If the problem is in the crossovers, test each component and write down the numbers. Or just throw new crossover in .........
  5. The growing list of projects I would like to do.... If you could post the Bills of material and links for replicating your projects it would be helpful A lot of my project time gets sucked into Crawling around in attics in 150F changing failed exhaust motors and blowing the cottonwood seeds out of the clogged vents. New carburetor for a Lawn boy 4 Stroke arrived yesterday, so did the rain. Cleaning AC units and replacing the capacitors........ etc etc etc ............ You may want to make a new Topic for your favorite projects My 2 cents .......
  6. I believe your comment is correct Live amphitheater performances amplified were in mono to my memory I attended a lot of them, Merriweather Post Pavilion, Columbia MD Studio recordings, done properly, can reproduce the sound of an in person acoustic performance Multi track live recordings, can be mastered in the studio to achieve nearly the same effect of physical placement
  7. My McIntosh c-32 always sounds and feels like it was engineered for vinyl records where it does a superb job Built in Dynamic range expander and EQ
  8. They sound great with any quality amplifier I too love Yamaha' which is why I have so many of them Find a used Yamaha surround 5.1 amplifier that supports pure direct Good ones sell for as little as $100 US Be sure to get a working remote control You don't need HDMI, if it has it fine. Try to get 10 years old or less Look at the specs, THD, SN Watts is unimportant, 100 WPC on the front is more than enough Amp also has a good built in DAC The amp will also support a sub woofer, and may have room correction
  9. What is quantization error and how does signal to noise relate to this? Question : What is quantization error and how does signal to noise relate to this? Answer : Quantization error is the difference between the analog signal and the closest available digital value at each sampling instant from the A/D converter. Quantization error also introduces noise, called quantization noise, to the sample signal. The higher the resolution of the A/D converter, the lower the quantization error and the smaller the quantization noise. The relationship between resolution (in bits) and quantization noise for an ideal A/D converter can be expressed as Signal to Noise (S/N) = -20*log (1/2^n) where n is the resolution of the A/D converter in bits. S/N is the signal to noise and is expressed in dB. This relationship can also be approximated as S/N = 6*n. Typical S/N ratios for ideal A/D converters are 96dB for 16 bits, 72dB for 12 bits, and 48dB for 8 bits. https://www.tek.com/en/support/faqs/what-quantization-error-and-how-does-signal-noise-relate Good explanation of how a DAC works The phono GANFet in the Panasonic above is an A-D converter note the saw tooth diagrams https://www.tek.com/en/blog/tutorial-digital-analog-conversion-r-2r-dac What are aliasing errors? Are they hard to detect? Answer : An alias is a false lower frequency component that appears in sampled data acquired at too low a sampling rate. Aliasing errors occur when components of a signal are above the Nyquist frequency (Nyquist theory states that the sampling frequency must be at least two times the highest frequency component of the signal) or one half the sample rate. For example, if you are acquiring data from eight channels at 100k samples/second, the sampling rate for one channel is 100 ksamples/second * 8, or 12.5 ksamples/second. In this case, any signal component with a frequency above 6.25 kHz will cause aliasing errors. Aliasing errors are hard to detect and almost impossible to remove using software. The solution is to use a high enough sampling rate, or if this is not possible, to use an anti-aliasing filter in front of the analog-to-digital converter (ADC) to eliminate the high frequency components before they get into the data acquisition system. My comment: CD eliminates everything above 20Khz If you can't hear it, does it need to be there amp designs that can't handle high freqs have TIM distortion Something about Nature, it all works together in a unified system
  10. As the chip set production ramps up the cost per watt should begin to fall Especially if RIAA GAN chip sets etc hit the market Low end systems will be 4-5 chip sets with mfg firmware mounted on a PCB like the low cost Class T, D products we see now
  11. Selling my G-4700 $600 cash, may do paypal for a forum member May ship for a forum member Sansui G-4700 Receiver Just restored at Deltronics in Woodridge New capacitors and parts, and radio calibrated Deltronics will honor transferable warranty until Sept 3, 2022 Minor blemish on top, and one graumet for a case screw is missing both visible in photos Sansui G-4700 AM/FM Stereo Receiver (1979-80) Tuning range: FM, MW Power output: 50 watts per channel into 8Ω (stereo) Frequency response: 10Hz to 70kHz Total harmonic distortion: 0.05% Damping factor: 30 Input sensitivity: 2.5mV (MM), 150mV (line) Signal to noise ratio: 76dB (MM), 95dB (line) Channel separation: 50dB (MM), 50dB (line) Output: 150mV (line) Speaker load impedance: 8Ω (minimum) Dimensions: 433 x 155 x 355mm Weight: 8.6kg Inputs: Phone, Tape 1 & 2, Aux, Tuner Hifi Engine has reviews and manuals Terms Cash Photos https://chicago.craigslist.org/wcl/ele/d/naperville-sansui-4700-receiver/7511349329.html
  12. One of the Japanese majors has gone GAN This one is Korean https://www.crutchfield.com/S-3h5jpiPRM59/p_358RA180/HiFi-Rose-RA180.html? There was at least one at AXPONA I suspect they will replace the current class D in the surrounds amps in the next 12-24 months as the GAN Audio chip sets ramp up. More efficient, less heat, greater density, smaller power supplies = cost reduction per watt with better spec out SEARCH "GAN audio amplifiers" lots of new products GaN400 Power Amplifier $2,999.00 GaNFET Technology • 400 watts per channel • Drives any speaker • Fully balanced topology • Balanced and unbalanced inputs https://www.peachtreeaudio.com/products/gan400 Nice explanation from Peach Tree What is GaN? The GaN400 achieves new levels of performance and efficiency by utilizing GaNFETs instead of MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) that have been the industry standard for more than 50 years. MOSFETs revolutionized the electronics industry in the second half of the 20th century and have become the most common transistor in electronics and the most widely used semiconductor device in the world! Their significance in the electronics industry and the other industries that rely on them can’t be understated. However, over the years, the rate of MOSFET improvements leveled off as the performance got closer and closer to the theoretical limits of the materials and processes. The need for something better grew. Enter GaN. GaNFETs started to gain attention over the last decade as audio engineers and designers realized that they were suitable for high frequency, high voltage, high temperature and high efficiency applications especially when compared to their MOSFET counterparts. GaNFETs turned-on ~4 times faster and turned-off ~2 times faster reducing switching distortion (ringing) by several orders of magnitude. This, in-turn, allowed designers to use much less global negative feedback to achieve excellent measured results. The result is an amplifier with exceptional musicality and excellent measured performance. In other words, an amplifier that provides wonderfully natural sounding music reproduction like the best tube amplifiers, yet retains the tight bass, extended frequency response and sheer dynamics of the best solid- state amplifiers. It really is the best of both worlds and all of this is accomplished in an amplifier that is also one of the most efficient designs in the market today converting ~96% of the electricity from the wall into usable power. The Importance of the Power Supply Every power amplifier is dependent on its power supply to provide the power reserves necessary to drive the loudspeakers at any volume level. The GaN400 is no different and it utilizes an impressive 850-watt RMS regulated power supply. This supplies the output modules with all the clean power they will ever need - even when things get really loud. The power supply uses the best parts available to ensure high performance, durability and long-term reliability.
  13. Probably should have done 1 yr mechanical aka switches, and 3 electronics I have never had a mechanical sw failure on my audio gear but I set them and forget them
  14. Starting to see GAN FETs in new Amp designs Specs out much better than the Class D offerings we have seen Was Mil Tech until recently Gallium nitride (GaN) ICs Maximize power density and efficiency with our portfolio of GaN power devices for every power level Our family of gallium nitride (GaN) FETs with integrated gate drivers and GaN power devices offers the most efficient GaN solution with lifetime reliability and cost advantages. GaN transistors switch much faster than silicon MOSFETs, offering the potential to achieve lower-switching losses. Our GaN ICs can be used in a wide range of applications, from telecommunications, servers, motor drives and laptop adapters to on-board chargers for electric vehicles. https://www.ti.com/power-management/gallium-nitride/overview.html What is gallium nitride (GaN)? Gallium nitride (GaN) is a wide bandgap semiconductor that enables higher power density and more efficiency than traditional silicon metal-oxide semiconductor field-effect transistors (MOSFETs) and insulated gate bipolar transistors (IGBTs). GaN processes power more efficiently than silicon-only solutions, reducing power loss by 80% in power converters and minimizing the need for added cooling components. By packing more power into smaller spaces, GaN lets you design smaller, lighter systems. Some Eng articles on Gan, some audio related https://www.electronicdesign.com/leaders/power/power-supplies/article/21174367/gan-fet-technology-solving-audible-challenges-for-highperformance-audio-amplifiers
  15. https://www.crutchfield.com/S-3h5jpiPRM59/p_358RA180/HiFi-Rose-RA180.html? https://eng.hifirose.com/index Another amp using Gan FET tech which was reserved for Mil applications So I have been told Amp has excellent specs THD, SN I wonder how it sounds
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