Bubo
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Posts posted by Bubo
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10 hours ago, veloceleste said:
I had a PL1000 back in the day (the stand alone auto-correlator/dynamic range expander) and it was a very effective device with phono and tape. I held on to it into the mid to late 1980’s. Once I started listening to more cd’s than vinyl (yes, I was an early adopter) I sold it because the noise reduction and dynamic range expansion were no longer necessary to my ears. For vinyl though, it was a great piece and I enjoyed its benefits a lot.
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
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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
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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
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2 hours ago, pzannucci said:
Would love to have one of these:
https://www.stereophile.com/content/technics-su-r1000-integrated-amplifier
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
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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
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18 hours ago, Schu said:
what amplifiers are you seeing this in?
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 inputshttps://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.
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10 minutes ago, henry4841 said:
With 1 year warranty. Does not speak confidence.
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
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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
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20 hours ago, jcn3 said:
??? That is the make and model . . . .
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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In broad strokes, the review was spot on
Agree, the Forte punches way out of it's weight class
I spent days listening to all of them side by side at Audio Associates in Wheaton MD, back in the 70s.
The KH has better base, but placement sensitive, so I went with the LaScalas and never looked back
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Does anyone know what the make and model of the Integrated amp is ?
Buttons, gauges, meters, sliders, knobs, switches and Steam Punk Gears
Looks like the ultimate device of some kind
the only thing missing is a flywheel or some other moving part
Found it on his YT page
HiFi Rose RA180
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ION AIR PURIFIERS
I have several of these that work great
The Ozone part concerns me
especially when it comes to the Klipsch speaker surrounds
Does anyone think a cleaner like the Ionic Breeze (most famous)
or the Environ Ionic-Pro will generate enough O3 to damage anything ?
They are effective at cleaning the air, but not at the cost of damaging my speakers or electronics
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6 hours ago, sunburnwilly said:
Must be feeling cantankerous this am
What's with the all-black Goth look ?
I remember these guys as bubbly bouncy early 20s band
with a unique style ..
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6 hours ago, sunburnwilly said:
Loved Krauss, never a LZ fan
Was hoping for something new
Love is blind .....
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11 hours ago, Full Range said:
Elvis Presley cover by Angelina Jordan
Bee Hive making a comeback
or Coneheads parody ?
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Goodnight from Chicago
Just a Biker Bar Band from California
Should have been the LP of the year 73
Captain and Me
Crank it up, forget the neighbors, Every track rocks
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8 hours ago, billybob said:
The #2...007:
What a great movie in so many ways
Lazenby pulled it off in great fashion
Don't recall why they didn't bring him back
Armstrong hit it out of the Park on the theater sound system where I saw it.
Don't understand how Dandy Moore ended up with the job and each farce worse than the previous one.
Live and Let Die was great, then it fell off a cliff.
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Goodnight from Chicago
Retro Temptations
The "Classic 5" lineup of the Temptations in 1967. Clockwise from top: David Ruffin, Melvin Franklin, Otis Williams, Eddie Kendricks, and Paul Williams.
wiki
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If you can afford the 5W Decware Amp
you can afford replacement tweeters
Buy the amp, and if you start blowing out tweeters,
either turn it down, or get a 30W tube amp
Lots of class A that measure well, and keep you warm in the long winters
Pair of the beloved MC-30 Class B mono blocks, would be my sentimental Fav.....
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Half a Watt is screaming
1/100 W is normal listening
The question is at loud listening,
What does a piano strike, gun shot or cymbal drive the amp up to ?
If clipping destroys the tweeters
Does 5 W exceed the demand of the above ?
QuoteA drum set and cymbals is on average 119dB but can range between 90 and 130dB (decibels) depending on what instruments are being played.
I also took measurements at varying distances (at the drummer’s ears, 5 feet and 20 feet) from the drum kit, which helps to illustrate the concept laid out in the Decibels section of this article:
Volume At Ears 5 Feet 20 Feet Soft 105 dB 99 dB 91 dB Medium 115 dB 109 dB 98 dB Hard Hitter 125 dB 120 dB 111 dB Hard w/ rimshots 130 dB 125 dB 118 dB AVERAGE: 119 dB 113 dB 105 dB One thing of interest here is that the results don’t always align perfectly with the rule of a 6dB drop for every doubling of distance. This is largely because of various acoustic factors at play.
Good read
https://pickmydrumset.com/how-many-decibels-db-loud-is-a-drum-set-and-cymbals/
Borrowed from garyrc
wts SPL
1 95 dB
2 98 dB
4 101 dB (might deliver dynamic peaks as high as 104 dB--some risk of clipping)
8 104 dB
16 107 dB
32 110 dB
64 113 dB
128 116 dB
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2 hours ago, Invidiosulus said:
Curtis Steigers
This guy reinvented himself to Jazz
Sons of Anarchy Music director loved him.
Back at you
Looks like Bill Paxson on the guitar
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17 hours ago, Marvel said:
Love one mic' setups with acoustic groups.
The one type of music that I and my recently departed friend had in common was Blue Grass.
Alas he liked speed, and I like the more rhythmic and slow.
When I visited his place in the corn fields, we ended up with Perry Mason reruns for entertainment after the grill was off.
Nice sounding band...
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Clean all of the connections and gently inspect everything
take some photos and post them
Wiring may be dry rotted, plan on replacing all of it
Mid range horn, aka squeaker, gasket between driver and horn is guaranteed dry rotted
Caps on the crossovers are way past predicted life span
Easiest and maybe best solution is a set of new Crites crossovers.
Once disconnected, you can check the resistance of each driver, write it down and post it here.
A basic Multi-meter from the hardware store should test in Ohms.
Tell us what you find.....
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Scrolling through my collection
feeling retro this AM
A few classics
Concert could stand a resynch, upscale and audio clean up, which sounds pretty good.
Gen 1 Music video, no auto tune etc or strippers
Record quality just OK
Blind Faith first concert Hyde Park
Better quality 2007 version live
1970 Solo LP
Full concert from Master
One of my fav LPs on vinyl
Live at the Fillmore
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Hifi's obsession w/ imaging...
in 2-Channel Home Audio
Posted
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