Design?

Cevni, tranzistorski, hibridni...
softspeaker
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Design?

Postby softspeaker » 07 Jun 2011, 12:57

Estetika na vrhunskem nivoju, zvok? Pitanje...

Gato Amp 150

http://www.gato-audio.com/amp-150.php
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B.M.C. Amplifier C1
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softspeaker
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Re: Design?

Postby softspeaker » 10 Oct 2011, 18:25

Absoluta Partenope - mega zadeva, zvok in design!

http://www.absoluta.it/index.php/en/pro ... enope.html

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Re: Design?

Postby softspeaker » 05 Jul 2012, 16:37

Devialet D-Premier integrated amp/DAC, jim je uspelo? Pustimo se presenetiti, sicer pa to ni "čista" D klasa, ampak nekaj hibridnega....

A Class AD audio amplifier in which a class A amplifier generates the voltage and a parallel class D amplifier injects current such that the loudspeaker sees both amps.

Class D (switching amps) have often been criticised for poor HF and extended HF performance.
A little known fact is that most Class D amps CANNOT deliver their rated Power @ 20KHz.
They may have a Frequency Response to 20 KHz. This is usually measured when delivering a TOKEN output power... often 1 Watt.
These amps Do Not deliver a 20 KHz POWER OUTPUT RESPONSE ie full power at 20 KHz.

http://www.hifi-forum.de/viewthread-59-1727.html

As class A provides the master voltage and only uses class D as turbo to inject current, the output impedance too is prone to the 100 x multiplier. It’s the secret behind the D-Premier’s otherworldly low output impedance. Naturally there are certain parts of the musical frequency spectrum where class D has issues. Rapid transients are not a forté especially in the high frequencies. Here enters the beauty of the AD hybrid. At high frequencies where little power is needed class A can easily deliver 5 amps for short periods.
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I HATE class D amplifiers. I've never heard one I've really liked, and even though the Devialet is a Class A/Class D hybrid, I expected it to sound harsh and flat like all the other class D amps, but it is very nice, very musical.
Their marriage of Class A and Class D works very well.

Not the best sounding component in the last 40 years, but one of the best COMBINATIONS for the money. As I recall the only time I've ever called a component "the best" in almost 400 product reviews
was the Burmester 911 mk.3, which I still feel is the best power amplifier made.

http://www.stevehoffman.tv/forums/showt ... p?t=244099

The D-Premier utilizes a pair of Class D output modules, yet it is driven by a pair of Class A amplifiers in a unique hybrid module configuration that provides the advantages of both designs and the limitation of neither. First and foremost, the D-Pre-mier does not sound like any Class D amplifier I've ever heard. I admit a slight personal bias against Class D amplifiers even though I keep auditioning every one I can get my hands on. But shortcomings remain. They typically offer a degree of sterility in their presentation, and in my experience, have been highly speaker-dependent, much like an SET or OTL amplifier. Hence, an optimum match yields decent sound, but a less than optimum one makes for a mediocre musical performance. Even the best examples have sounded somewhat flat. That said, it is clear that Devialet's technology represents a quantum leap forward in tonal purity.
Pairing the D-Premier with a wide range of speakers (GamuT S9, B&W 805D, Magnepan 1.6) along with several models I had in-house for review and photography (Zu Soul Superfly, Martin Logan Aerius i, PMC DB2i, Totem Forest) all provided synergistic combinations and a consistency I've never experienced with traditional Class D amplifiers.
While Class D amplifiers often exhibit an impedance mismatch with some speaker/speaker cable combinations, resulting in a sound that is brittle and lifeless at best or seriously rolled off at the HF portion of the frequency spectrum, the Premier-D did not change its character. But remember, it is not a pure Class D amplifier.

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http://www.avguide.com/review/the-devia ... -75?page=2

One of the big criticisms of Class D amplifiers is their reluctance to drive every loudspeaker equally well. Get a good partnership – typically a speaker with low efficiency and high nominal impedance – and the magic happens. Break rank and you break the spell. Some fare better than others. And yet, strangely, the D-Premier doesn’t just make Class D more loudspeaker tolerant, it inverts the issue. Suddenly, set against the D-Premier, many conventional power amps seem ‘speaker fussy’ by contrast. It can drive practically anything, and will generally sound good doing so. The one reservation here is some speakers don’t react well to having the window thrown open in the Devialet style. Some seem designed with a specific amplifier ‘envelope’ in mind and the neutrality of the D-Premier only serves to highlight this – it’s like the amp comes with a built-in ‘honesty’ filter. On the other hand, I’ve heard whispers of loudspeaker designers saying they didn’t know how good their speaker was until they heard them through the D-Premier, and rumours that the French company’s order books are filled with requests for products from loudspeaker brands across the planet.

http://www.soundstagehifi.com/index.php ... s&Itemid=4

http://www.soundstagenetwork.com/index. ... &Itemid=19

Design je vsekakor Fül kül

Edit: 26.11.2012 sem ga slišal v kombinaciji s Ktemo, zvok? Mislim, da odličen.

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Re: Design?

Postby softspeaker » 26 Jul 2012, 10:29


softspeaker
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Re: Design?

Postby softspeaker » 12 Sep 2012, 01:43


softspeaker
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Re: Design?

Postby softspeaker » 26 Sep 2012, 12:51

Tim de Paravicini at Munich Hi-End Show 2010:"Nobody builds electronics anymore like ALEF!"

5Hz a 50kHz +/- 0,1dB (bandwidth from DC to 6MHz), Two massive transformers – 680 VA, Power: 2 x 180W @ 8Ω, 15W in Class A, >10KW peak ???

http://www.alef-audio.com/category/alef-products

http://www.tmhaudio.com/ALEF.htm

http://www.alef-audio.com/alef-orchestra

ALEF Duet-SE Stereo amplifier

Unsurpassed levels of transparency, dynamics & resolution Deeper & better controlled bass Extraordinary “Soul” that makes others sound soulless. Nothing else compares!

http://www.jazzybird.com/heading/1-174/ ... estra.html

The ALEF electronics are simply the finest I have ever heard...period!

The designer has created circuits that are flat & stable to 6Mhz...and not requiring special cables or networks.

Created & crafted in Italy with ultra high construction quality using the finest quality components to insure the highest level of performance and a long, trouble-free life.

Sonics?

Think 'Soulution'...but executed at a MUCH higher level!

Sonically, the transparent purity of the finest OTL amplifiers but lightning fast with a greater top end extension, a more open sound, deeper & tighter bottom octaves, more effortlessly explosive dynamics and an amazing lifelike presentation of tonal qualities.

The ALEF series linestage, amplifiers, integrated & phono incorporate 6Mhz circuits.

These are absolutely the most amazing electronics I have ever heard including mega priced $350k monoamp designs!

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Re: Design?

Postby admin » 27 Sep 2012, 14:20

Chord SPM-6000 monaural amplifiers
http://www.chordelectronics.co.uk/

"The high-frequency SMPS operate in the 80kHz range unlike conventional power supplies which plow the 50-60Hz range. Chord's operate simultaneously on the positive and negative rails for a still more dynamic response.Chord believe that despite their excellent transconductance behavior bipolar transistors are not the most efficient choice because of distortion created by on/off switching. Neither do Chord embrace traditional class A bias which never shuts off its output devices to overcome issues of nonlinear operation. Class A for these power ratings is far too inefficient and thermally impractical. Chord's transistors of choice are developed exclusively for them by a UK semiconductor fabrication house formerly involved in the aerospace sector.
The Chord amps have a very sophisticated power supply. This 5th-gen iteration uses spread-spectrum tech, phased clocking, high-frequency auxiliary and a few other advanced solutions from the aerospace sector. Each amp includes three 4kW power supplies in parallel but working individually.
Chord's parts are based on metal on silicon.But the Chord cornerstone must be their high-frequency switching power supply which can reload far more often than conventional variants. These self-contained self-monitoring supplies can be run individually or in parallel for great flexibility in amplifier design. Wall power is filtered, rectified to DC and stored in a bank of high-voltage capacitors. It then converts to an HF waveform with high-voltage Mosfets running at 80kHz. At this point the high-frequency waveform encounters a custom-made ceramic-core transformer wound with multi-strand Litz. Considering HF mode, Chord don't need big trafos to rectify this waveform. At the transformer's output a bank of high-speed rectifiers, a small coil and small capacitors convert the waveform back to DC whence it hands off to Chord's dynamic coupling of the power supply rails prior to being absorbed by a final bank of storage capacitors. This technique is said to provide better thermal matching of the output devices and to eliminate the need for temperature-balancing resistors in the output stage to substantially improve efficiency and overall stability. A specific output protection system relies on magnetic flux generated between the power supply rails. The amplifier monitors differences in flux density between the rails over a given period as determined by mathematical algorithms which switch the amplifier into standby when required. Output bias is sliding class AB. It operates in class A during low-level signal and transitions into class B during demanding conditions.
Specifications seem as amazing as the cosmetics. Output power is 750 watts RMS into 8Ω at 0.05% distortion; 1.5Kw into 4Ω; and 3Kw into 2Ω! At -3dB the response spans 10Hz to 90kHz (8Ω) and SN/R is >103dB 'A' weighted two thirds.

http://www.6moons.com/audioreviews/chord2/1.html
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Re: Design?

Postby admin » 15 Jul 2013, 19:07

The Lars Type 2

http://www.thelars.se/#design-details

The purity of The Lars’ sound is obvious upon hearing the first few notes. But pure sound has benefits beyond those of "normal" hearing/listening pleasure.

Research has shown that slight impurities in the reproduced sound of music – what scientists call 'gray sound' – irritates the mind and causes stress and fatigue. Using less-than-linear amplification devices is where gray sound begins.

Less-than-linear amplification devices need negative feedback for stability. Even most designs built around linear devices will employ negative feedback. TIM (Transient Inter Modulation) distortion (a by-product of negative feedback) is a key element of gray sound.

There is zero negative feedback and therefore zero TIM distortion in THE LARS amplifiers. Gray sound has been completely eradicated. That’s why listeners instinctively know that there is a “rightness” to the sound of The Lars.

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Re: Design?

Postby admin » 01 Aug 2013, 16:03



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