DACs - τελειωμό δεν έχουν


vlasis

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Gato Audio PRD-3 preamplifier with DAC



"The DIA amplifier family will from February, include a fair priced preamplifier⁄DAC called PRD-3. Based on the DIA integrated amplifiers it offers a very good sounding, straightforward preamplifier that includes the DAC circuitry from DIA-250 and DIA-400. It has exactly the same features as the DIA's but without the output stage and of course it is offered at a very nice price point. The retail price will be around 2.495 EUR."









More than just a Preamp

The built-in D/A converter offers real high end performance, enabled by the use of a dedicated power supply, a balanced-drive Burr-Brown PCM1794 D/A converter, an optimized high bandwidth I/V converter, and an analogue stage with low-Q, low pass filters. All digital inputs are upsampled to 24bit/192kHz. This D/A converter will upgrade any digital source - such as wired or wireless streaming from your computer or CD drive - to a high end level of detail and musical performance.

Versatility and Connectivity

We had our eye on versatility and connectivity when designing this preamplifier. The PRD-3 offers not only a wide range of digital and analogue inputs, but also line outputs, a trigger signal for external power amplifiers, and a configurable home theater input. The HT input can turn the preamplifier into a fixed level preamplifier for use in a surround setup, without compromising the sonic performance.

Features:

Built in 24bit/192kHz D/A converter with upsampling
Coax, optical and asynchronous USB digital input up to 24bit/192kHz
Accepts digital streaming directly from Apple iPad
Two unbalanced and one balanced inputs
One unbalanced and two balanced outputs
Nonmagnetic enclosure
Direct function; enables use in home theatre systems

http://gato-audio.com
 

dapost

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Απάντηση: DACS....και τελειωμο δεν εχουν !!!!!!!!!!!!!!!

AURALiC VEGA






για διαβαστε παρακαλω......κατι εχει να μας πει.........




With Sanctuary Audio Processor as heart, AURALiC introduces several cutting-edge technology for VEGA: 'Megahertz upsampling' algorithm processes all PCM music to 1.5MHz in 32bit; 'Femto Master Clock' provides an ultimate clock precision with jitter only 82 femtoseconds(0.082 picoseconds). Binding with other AURALiC's patented technologies such as 'ORFEO Class-A module' and discrete 'Purer-Power™ solution', VEGA will bring high resolution music playback experience to climax.









VEGA supports all high resolution music formats including DXD(352.8KS/s, 384KS/s in 32bit) as well as DSD stream at 2.8224MHz and 5.6448MHz. Five digital inputs include AES/EBU, Coaxial(set of two), Toslink and USB. The balanced and single-ended analog outputs can connect to power amplifier directly, adjusting volume in digital precision without dynamic loss. VEGA has six built-in filter modes allows its user to customize according to different music formats, tuning sound best to personal preference.

"VEGA is an unique design, It not just supports all high resolution music format, but also powerful in its advanced function. It is the approach to real high-end that most enthusiastic audiophile long for", said Xuanqian Wang, "like other creation from AURALiC, the ingenious design of VEGA bringing you enjoyment in both aural and visual".







Suggested retail price: VEGA: $3,499/ €3,299(incl. VAT)

Πρώτα διάβασα αυτό:

"Auralic's Vega D/A processor offers measured performance that is beyond reproach"

http://www.stereophile.com/content/auralic-vega-da-processor-measurements

και αμέσως μετά αυτό:

"Λαμβάνοντας το συνολικό πακέτο των μετρήσεων υπόψιν, ο μετατροπέας της Auralic φαίνεται να είναι αυτός με την καλύτερη συμπεριφορά που έχουμε μετρήσει μέχρι σήμερα και μάλιστα με διαφορά."

που πρώτος είχε γράψει ο ένας και μοναδικός δικός μας DStam:

http://avmentor.gr/reviews/auralic_vega_2.htm

και με minimum phase φίλτρο, και καλό προενισχυτικό στάδιο, και λογική τιμή, τι άλλο θέλει κανείς; (ΟΚ, εγώ θέλω περισσότερα κανάλια, αλλά τέλος πάντων...)
 



m1ts0s

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http://www.gracedesign.com/products/m920/m920.htm

Grace Design m920



The m920 High Resolution Monitoring System - Impeccable, pedigreed audio performance for discerning audio professionals and connoisseurs. The m920 stands on the shoulders of its predecessors then jumps to new territory in digital and analog audio performance. Using the latest 32Bit Sabre DAC technology, it delivers up to 384kHz PCM and 64x and 128x DSD playback. The m920 provides state of the art DAC performance in our award winning compact, do everything utility design. For home or studio, this is truly the ultimate, high resolution monitoring system.

Building on 15 years of experience designing reference playback equipment, the technology in the m920 is highly evolved and refined. Each time we set out to improve a design, the goals are always clear: Lower the distortion, improve the noise performance, lower the DAC's jitter, make it more reliable. Make it better. With the m920, we hit the all bullseyes. The new, world-class M Series 32-bit Sabre DAC provides an astonishing improvement in digital performance. Redesigned s-Lock PLL circuitry improves jitter rejection. DSD64 and DSD128 playback brings great musicality to digital recordings. Every performance and design element was concidered and where improvements could be made, they were. This is truly pinnacle for high resolution playback.
 

m1ts0s

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Και σχόλια ατόμου της εταιρίας στο head-fi.org:

"Hi All,
I thought I would chime in here and describe some of what is new inside the m920.
As you can see the chassis is pretty much the same as the m903 but with a new color scheme and an additional LED to indicate the presence of a DSD stream. The technology inside however is the result of a person-year of design engineering. Some borrowed from our new m905 studio monitor controller and some new developments just for the m920.
The headphone amplifier topology remains unchanged from the m903 although we did change the cross-feed circuitry to a design based on the Ohman circuit. To me this design works better at presenting a cohesive sound stage from recordings that have hard left and right material while still remaining tonally neutral enough for critical recording/mastering application.

The unbalanced input topology is has improved noise/EMI protection. In a world of ever proliferating 1.9-2.5GHz radios (CDMA, WIFI, Bluetooth, etc.) unbalanced interfaces are more vulnerable to corruption.
Also, the low frequency response has been extended by nearly an octave.
The unbalanced outputs can be programmed with internal jumpers to act as a fixed DAC output. In this mode the DAC is connected directly to the output drivers and the volume control circuitry is bypassed.

The m920 uses a new USB audio controller IC. It is the XMOS XS1-SU1 operating at 500MHz. The significant improvement here is that this IC has an integrated USB PHY. This eliminates one chip and with it the pcb routing of the noisy high speed 8 bit buss that connects the two.
The software for the new XMOS IC was developed Caleb Roberts here at Grace Design. It includes highly optimized asynchronous USB audio stream management which now includes DSD stream reception up to 128x (VoP1.1) and DXD PCM (384kHz, 324bit). The XMOS is also capable of decoding DSD from the SPDIF and AES3 (64x only)
The entire clocking system in the m920 has been redesigned. When receiving SPDIF, AES3, or TOSLINK signals the m920 uses the s-Lock VCXO based PLL to recover a pristine clock to send to the DAC. This is the third generation of s-Lock PLL which was developed for the m905. It's ability to reduce low frequency jitter from the incoming clock stream is effective to almost two octaves lower than the previous design. As well the new s-Lock PLL has a fast lock mode which speeds up the lock up time. Once lock is achieve, the PLL automatically switches to the ultra low noise high jitter rejection mode.
If the incoming signal is outside of the lock range of the s-Lock PLL, as secondary digital PLL/clock synthesizer is used. This clock has very low jitter and a wide lock range. This can be advantageous when connected to Apple TV and other similar boxes which can have off-speed clocks.
The m920 has an s-Lock disable mode in the setup menu. This can be useful for the above mentioned devices which can have clock speed shifts that would cause the old s-Lock in the m903 to loose lock periodically.

The DAC in the m920 is the new ES9018-2M (not to be confused with the ES9018 which is the older 8 channel DAC). This is their state of the art 2 channel 32 bit DAC. We operate the ES9018-2M dac in synchronous mode so that the internal sample rate converter is bypassed. The internal ASRC is useful in a system that presents noisy clocks to the DAC but with the s-Lock PLL to remove incoming jitter it is not necessary.

The setup menu contains controls for setting the DAC filter response. For PCM audio streams the user can select between fast, slow, and minimum phase response.

For DSD audio there are four low pass filter corner frequencies:
47kHz, 50kHz, 60kHz, and 70kHz. The default setting here is 47kHz.

The 9018-2M is a current output DAC and, like in the m903, we use transimpedance current to voltage converters. These are the best at resolving complex harmonics while remaining linear in the presence of high slew rate noise from the DAC outputs. Regular op-amps, whether discrete or IC based, just don't compare in terms of clarity, dimensionality, and musicality.

In the end, the digital system in the m920 is much more sophisticated than in the m903. We wanted to be able to have the option to upgrade the internal code in the m920 without the user having to remove the cover and replace flash chips. Jamie Krapohl wrote the main control processor code for the m920. He and Caleb worked together to create a system that allows for the user to upgrade the firmware through the USB jack using the USB DFU (device firmware upgrade).
Jamie also wrote in code that allows the m920 to be controlled from the Apple IR remote. These are nice little remotes that are reasonably priced. The m920 can be "paired" to the Apple remote for exclusive operation.

I don't get on Head-Fi all that often but feel free to ask questions about any of this!
Cheers,
Michael"

http://www.head-fi.org/t/709617/new-grace-design-m920-dac-amp-with-dsd-decoding
 

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Using the latest 32Bit Sabre DAC technology, it delivers up to 384kHz PCM and 64x and 128x DSD playback.

Παπαριες μαριτσα μου.
 

vlasis

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:):):):):):)
πολυ χρησιμες πληροφοριες Μητσο μας..........πρεπει να βαλλω στην μπριζα τον Μανο να δωσει το 903 και να χτυπησει το νεο μοντελακι!!!!:geek::geek:
 

vlasis

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m1ts0s

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Tascam UH-7000



The UH-7000 is a pro-level microphone preamp and audio interface designed with a strong focus on low noise and high audio quality. Not only can this unit be used as a 4-in/4-out audio interface in a DAW production environment, but as a standalone microphone preamp and A/D / D/A converter. The built-in HDIA (High Definition Instrumentation Architecture) microphone preamps are newly designed and perform at ?128 dBu equivalent input noise, a signal-to-noise ratio of 117 dB and distortion of 0.0009 % or less.

The grand nature of the UH-7000’s sound is partially due to the careful attention spent on selecting parts. In addition to Burr-Brown converters and metal thin-film resistors, installed is a powerful TCXO clock generator with a precision of ±1 ppm.

The unit’s half-rack size makes it easy to install at a studio console or work desk. The thick aluminum panels used on the front and sides of the full-metal body help increase stability. Highly important but easily forgotten about are the smooth-tension aluminum input level knobs for precise level adjustments.

The UH-7000 microphone preamp and audio interface enables composers, musicians and recording engineers to produce music in their private quarters at a level generally reached only in professional studios.

Main Features
  • Top-of-the-line two-channel USB audio interface for Windows and Macintosh computers
  • Can be used as a stand-alone high-end AD converter for monitoring or recording to stand-alone recorders
  • High-performance mic preamp newly designed for this model reduces influence of impedance mismatch with high accuracy resulting in most accurate audio reproduction at the input stage
  • Superb audio quality with samling rates up to 192 kHz at 24-bit resolution
  • Ultra-high dynamic range of 123 dB (A/D) and 128 dB (D/A)
  • Professional-grade PCM4220 A/D and D/A converters from Texas Instruments
  • Selected components like metal film resistors and film capacitors for outstanding sound quality with noise and distortion minimized to a minimum
  • High-precision clock synchronization with sample-accuracy at both recording and playback
  • On-board DSP mixer and effects like EQ, compressor, noise suppressor, de-esser, exciter and reverb (effects up to 96 kHz only)
  • Two selectable mixer modes:
  • Multi Track mode for DAW recording and composing: Create a monitor mix independent of the actual recording levels
  • Stereo Mix mode for internet broadcasting and video editing: Create a stereo mix of two different sources plus loop-back signal from the computer
  • Mixer panel for intuitive mixing and effects handling on the computer screen
  • Dedicated button for opening/closing the mixer panel on the computer
  • Two large TRIM knobs for precise level adjustment
  • XLR and TRS balanced analogue inputs
  • Switchable 48-V phantom power on XLR inputs
  • XLR balanced line outputs
  • Line output level can optionally be adjusted with the headphones level control
  • Output selector allows a source to be output via the unit's mixer or via a computer connected by USB
  • Powerful headphones output with dedicated level control
  • AES/EBU digital I/O
  • Low-latency monitoring
  • Easy-to-read 20-dot LED level meter
  • Aluminum front and side panels for long durability even under tour conditions
  • Half-rack size
$600

http://www.tascam.eu/en/uh-7000.html
 

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το Tascam UH-7000 απο πανω και συσκευες παρομοιες, κατα ποσο μπορουν να συγκριθουν με dac/pro τυπου Grace, Benchmark, Mytec κλπ?

δλδ εννοω οι δυνατοτητες του tascam, θα αξιοποιηθουν απο ενα χρηστη που απλα ζηταει ενα pro/dac να παιζει hd υλικο?
δεν ειναι ας το πουμε, γι αυτους που εχουν καποιες γνωσεις πανω-κατω και θα αξιοποιησουν ενα τετοιο εργαλειο?

το λεω γιατι η διαφορα στη τιμη, σε σχεση με τα αλλα γνωστα dac (grace κλπ), ειναι σημαντικη...
ακομα και αν λοιπον, δεν χρησιμοποιησεις τα "καλουδια" του tascam, αξιζει κανεις να το "χτυπησει" μονο ως dac/pro?
 

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Μα φυσικά! Πιστεύεις δηλαδή πως τα άλλα έχουν κάποιον χειροπιαστό λόγο για να δικαιολογούν την 4ψήφια τιμή τους;
 

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Μα φυσικά! Πιστεύεις δηλαδή πως τα άλλα έχουν κάποιον χειροπιαστό λόγο για να δικαιολογούν την 4ψήφια τιμή τους;
Αν μιλάς από άποψη υλικών,πολλά την δικαιολογούν..
Κοίταξε πχ. το παρακάτω της audio-gd που το έχω άχτι.
Βάλε σούμα τα υλικά σε diy κατάσταση (χωρίς την εργασία) και θα δεις πως βγαίνει παραπάνω.(Τσεκαρισμένο αυτό.)

M73.JPG
 

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Μα φυσικά! Πιστεύεις δηλαδή πως τα άλλα έχουν κάποιον χειροπιαστό λόγο για να δικαιολογούν την 4ψήφια τιμή τους;
το οτι πληρωνουμε εκτος υλικων και λιγο brand name, ειναι γνωστο...ας χρεωνει ο καθενας οπως γουσταρει...ελευθερη οικονομια ειμαστε...

αλλα δε ρωταω αυτο...αμα ψαχνεται κανεις να παρει ενα dac/προ, γιατι να επιλεξει πχ το tascam, οταν πολλες απ τις δυνατοτητες του, χρησιμευουν μονο σε ατομα που μιξαρουν ή συνθετουν μουσικη σε καποιο home studio και ισως πχ εγω δεν τα χρησιμοποιησω ποτε?

τα dac τυπου grace σε δινουν κι αλλες δυνατοτητες αναπαραγωγης αρχειων (dsd κλπ κλπ)...οκ...μπορουμε τελικα να συγκρινουμε αυτα τα ας τα πουμε, ημιεπαγγελματικα dac (tascam), με τα αλλα του 1,5Κ?...αστα τα απο 1,5Κ και πανω

ή τα τυπου tascam, σωστα τα ονομαζουν οι επαγγελματιες που τα πουλουν, ως καρτες ηχου?

η athens πχ το συγκεκριμενο το χει στη κατηγορια "καρτες ηχου usb"..και οχι στα dac
 
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D

deleted user 10898

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Αν η USB του δεν είναι ασυγχρονη θα παίζει χειρότερα από τα γνωστά οικονομικά dac.
Ένα άλλο " ευαίσθητο σημείο " σε αυτη την κατηγορια είναι το volume.
Ήταν το μοναδικο μειονέκτημα της impactt twin που ειχα.
 

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Αν η USB του δεν είναι ασυγχρονη θα παίζει χειρότερα από τα γνωστά οικονομικά dac.
Ένα άλλο " ευαίσθητο σημείο " σε αυτη την κατηγορια είναι το volume.
Ήταν το μοναδικο μειονέκτημα της impactt twin που ειχα.
δλδ vet, λες οτι ειναι καλυτερα αν καποιος απλα "ξυσει την επιφανεια" και το θελει για ν αναπαραγει αρχεια hd μεσω του pc και μεχρις εκει, ειναι περιττο να δωσει ακομα και αυτο το σχετικα μικρο ποσο σε σχεση με αλλα και να παρει μια "καρτα ηχου"?

πχ εσυ που ασχολεισαι με ενεργα και εχεις και καρτα ηχου, τη metric, σε ποιο κομματι της αλυσιδας τη χρησιμοποιεις?...χρησιμοποιεις και εξωτερικο dac, εκτος της metric?...εχει ασυγχρονο usb η συγκεκριμενη?

υ.γ. ψαχνω να βρω και το post που ειχαν γραψει για τις "σηκωμαρες":D μετα απο τη χρηση metric, μπας και βγαλω ακρη
 
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ακυρη η ερωτηση για τη metric...βρηκα και διαβαζω...firewire συνδεσεις για mac κλπ κλπ
 

D

deleted user 10898

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δλδ vet, λες οτι ειναι καλυτερα αν καποιος απλα "ξυσει την επιφανεια" και το θελει για ν αναπαραγει αρχεια hd μεσω του pc και μεχρις εκει, ειναι περιττο να δωσει ακομα και αυτο το σχετικα μικρο ποσο σε σχεση με αλλα και να παρει μια "καρτα ηχου"?

πχ εσυ που ασχολεισαι με ενεργα και εχεις και καρτα ηχου, τη metric, σε ποιο κομματι της αλυσιδας τη χρησιμοποιεις?...χρησιμοποιεις και εξωτερικο dac, εκτος της metric?...εχει ασυγχρονο usb η συγκεκριμενη?

υ.γ. ψαχνω να βρω και το post που ειχαν γραψει για τις "σηκωμαρες":D μετα απο τη χρηση metric, μπας και βγαλω ακρη
κατσε βρε αγορι,
τα πραγματα ειναι απλα,
το "χαρακτηρα" ενος dac και το ποσο καλα παιζει καθοριζουν κυριως το αναλογικο του σταδιο, η συνδεση με τον υπολογιστη και ο μετατροπεας του (τσιπακι). Ουσιαστικα ομως αν ολα αυτα ειναι προσεκτικα επιλεγμενα, παιζει ρολο η συνολικη προσεγγιση του κατασκευαστη, η υλοποιηση.
Ειναι πλεον ξεκαθαρο πως ολα τα dac με ασυγχρονο τροπο επικοινωνιας με τον υπολογιστη ή αυτα με firewire υπερτερουν αυτων με απλες usb υλοποιησεις. Τα σφαλματα χρονισμου που οι απλες υλοποιησεις εισαγουν, υποβαθμιζουν καθε αλλο πλεονεκτημα του dac.
Τωρα, η metric halo που αναφερεις ειναι σε αλλο επιπεδο. Εχει μια μοναδικη ασυγχρονη firewire συνδεση ενω η ολοκληρωτικη προσεγγιση στην κατασκευη της την κανει ουσιαστικα ασυναγωνιστη στην τιμη της και για πολλους σε πολλαπλασια τιμολογια.
Το νεο ψηφιακο τους board που θα μπει και στις παλιες εχει 2 πρωτοποριακές προσεγγίσεις που θα κανουν παλι "αισθηση.."
Στο δια ταυατα,
μην κοιτας αν λεει καρτα ντακ κλπ...
αν το tascam εχει ασυγχρονη usb παρτο.
αν δεν εχει παρε ενα impact twin!
το impact twin παιζει καλυτερα με εξωτερικο προενισχυτη και fixed την εξοδο αλλα και ετσι θα σε ενθουσιασει.
αν τωρα θες dac .. ντακ και οχι ... καρτα, παρε οποιο σου κανει οικονομικα με καλη usb και υποστηριξη DoP για τα DSD σου και θα εισαι σουπερ.
 


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