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  1. Old Comment
    abraxalito's Avatar

    AKM's new "VERITA" AK4490EQ 120dB 768kHz/32-bit 2ch New Generation Premium DAC

    Plenty of claims, no listening description of the DAC you're so in love with....
    permalink
    Posted Yesterday at 11:05 AM by abraxalito abraxalito is offline
  2. Old Comment
    hollowman's Avatar

    AKM's new "VERITA" AK4490EQ 120dB 768kHz/32-bit 2ch New Generation Premium DAC

    Yes, ...

    Quote:
    Originally Posted by fas42 View Comment
    The real point is whether this DAC overcomes to a larger degree a common problem of S-D chips, that of loss of low level detail and treble quality unless they are heavily conditioned, exercised before doing serious listening.

    It seems to have a variation on the switched capacitor filtering circuitry at the output, which may be a key factor in perceived improvement - rather than anything to do with nominal number of bits.
    This ain't your grandpa's single-bit DAC. It's MODERN delta-sigma (with a hybrid approach: partial multi-bit).
    Nevertheless, it's hard to know exactly how/why a modern DAC improves SQ over prev. generations. The "salesman"/brochure specs -- 32bit, 768khz, etc. -- is probably mostly for show.
    Real-world reasons (for SQ upgrades) may be a chip's improved internal layout and/or improved material composition (= better solid-state physics).
    Evolution and improvements in topology-simulation software, chip manuf. machines, etc., all make important diffs. (Apple and Samsung have lot riding on the same machines/technologies and processes that make DACs).
    But trying to sell your chip on such vagaries as improved manuf. machines or better material physics is not so sexy as a short and sweet "120dB 768kHz/32-bit".
    permalink
    Posted Yesterday at 09:04 AM by hollowman hollowman is offline
    Updated Yesterday at 10:39 AM by hollowman
  3. Old Comment
    hollowman's Avatar

    AKM's new "VERITA" AK4490EQ 120dB 768kHz/32-bit 2ch New Generation Premium DAC

    It's hard hard to see outside the DIY box, just as it's hard to see outside the audiophile box.

    FOLKS ... look ...major designers/manufs of DAC ICs (AKM, TI, Cirrus, AD, etc.) are NOT blind/deaf to the subjective audio characteristics (many of these majors have audiophiles as senior designers). Further, they've got the resources for R&D -- the best test instruments and skills-sets -- to come up with the best price/performance products. Look from the objective side: Classic multi-bit can't match modern D-S is metrics/specs.

    If D-S was really as poor-sounding as many in diy(audio communities) claim, it would've been weeded out long ago (like early CD players and hard-sounding brick walls). I.e., we'd still have R2R, or we'd have some other conversion architecture.

    Over time ( esp. among the DIY, budget-audio and objectivist communities), a kind of locked-in syndrome has pathologized these gated communities. Maybe they -- many are older and immensely nostalgic, or romanitc, as noted in the Revox B225 comment above -- remember early single-bit DACs, which were not so great (but what about that 1-bit Optimus CD-3400??)

    The common-to-DIYers belief that classic multi-bit is high n' mighty is flawed. But if you polish the multi-bit turds enough (great output section, lotsa PS regulation, etc.), you can make any claim you want about any DAC.
    permalink
    Posted Yesterday at 08:45 AM by hollowman hollowman is offline
    Updated Yesterday at 08:49 AM by hollowman
  4. Old Comment
    abraxalito's Avatar

    High-end chipamp build project

    Yeah I'd recommend investigating some more of the Philips/NXP chips. I'm noticing a slight surge of interest in the STA540 (previously below the radar) but it looks to be a slightly lower specified version of the TDA8947 which gets a strong recommendation from me. Its biggest advantage is going to higher voltage (25V max) which allows it to be used with an output step down trafo to get better PSRR. Beyond that there's the TDA1521 which goes up to 42V but is current starved so a perfect chip to fit an output trafo to.
    permalink
    Posted Yesterday at 12:58 AM by abraxalito abraxalito is offline
  5. Old Comment
    Destroyer OS.'s Avatar

    High-end chipamp build project

    Interesting, perhaps I should venture into some other chips than the TDA7297. I'm somewhat under the impression that the balanced has benefits not seen otherwise. The reputation of some qualities they seem to have is talked about much, ever. At the far spectrum I'm reading about Ampzilla versions, also balanced.
    permalink
    Posted 26th August 2015 at 03:46 AM by Destroyer OS. Destroyer OS. is offline
  6. Old Comment
    abraxalito's Avatar

    High-end chipamp build project

    Sure - all these TDA-series car radio chips have balanced (or bridged) outputs to get sufficient output power from the nominally 14V rail.
    permalink
    Posted 22nd August 2015 at 11:10 PM by abraxalito abraxalito is offline
  7. Old Comment
    Destroyer OS.'s Avatar

    High-end chipamp build project

    So does it run balanced outputs in the configuration you have?
    permalink
    Posted 22nd August 2015 at 12:45 AM by Destroyer OS. Destroyer OS. is offline
  8. Old Comment

    Improving A/D perfromance of Sound Balster X-fi Music (SB1240) - and a Puzzle!!!

    The sound blaster is the only one that I have tested heavily.

    From a normal audio / listening perspective it is not bad at all, though I have not tested the Phono stage.

    Aspects that you might be concerned about:
    - It does 24 bit
    - it does 192KHz
    - The THD+N is in the 0.00X % region, which in my mind makes it "good". Some people however want REALLY REALLY low distortion.

    I guess I do too - but more for measurement than for listening. For listening I would not personally get overly fussed by the measured distortion of the SB.

    I don't do "subjective" unless things just sound wrong - so I m the wrong person to ask if it "sounds better". to me the SB sounds just fine.
    permalink
    Posted 21st August 2015 at 04:56 AM by googlyone googlyone is offline
  9. Old Comment
    abraxalito's Avatar

    High-end chipamp build project

    It might work depending on if you're using an LM338. If not then probably not quite enough current. Short-term peaks get handled by the reservoir capacitor but if you use an unreg supply the droop on load will be significant. If you go over voltage the chip will mute but not be destroyed.
    permalink
    Posted 17th August 2015 at 11:40 PM by abraxalito abraxalito is offline
  10. Old Comment

    High-end chipamp build project

    for this application 2 amper transformer is enough?
    permalink
    Posted 17th August 2015 at 02:16 PM by oxoxbyx oxoxbyx is offline
  11. Old Comment
    cviller's Avatar

    GB F5 Guide (pcb version 2)

    Hi Charles,

    The short answer is: it depends...
    I would probably not go too much up in voltage, but instead use any additional thermal headroom for increased bias. The heatsink you have is often being used for standard F5's. I have been running a stock F5 on a 400x177x50 (hifi2000) sink for years and it has never been overly hot, but I wouldn't want to crank it up too much without adding some forced air cooling.
    What voltage did you have in mind? Do you have efficient speakers?
    permalink
    Posted 17th August 2015 at 01:27 PM by cviller cviller is offline
  12. Old Comment
    abraxalito's Avatar

    High-end chipamp build project

    No, I haven't noticed that TDA8561 beats TDA8566, I didn't notice a difference between them.
    For power supply using a transformer is simpler, if you use a switcher you'll need some filtering (both normal mode and common mode) to get the best sound. I'd use a regulator if you use a transformer, like LM338.
    permalink
    Posted 17th August 2015 at 10:33 AM by abraxalito abraxalito is offline
  13. Old Comment

    High-end chipamp build project

    for power supply better using switching or transformer ?

    I will check on alie express I hope found this chip. TDA8561Q is better than TDA8566Q right?

    i hope this one not fake

    Free Delivery.TDA8561Q-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group
    permalink
    Posted 17th August 2015 at 06:26 AM by oxoxbyx oxoxbyx is offline
  14. Old Comment
    abraxalito's Avatar

    High-end chipamp build project

    Better, particularly in the bass. Doesn't go quite as loud though.
    permalink
    Posted 16th August 2015 at 11:26 PM by abraxalito abraxalito is offline
  15. Old Comment

    High-end chipamp build project

    hows sound compare to TPA3116 ?
    permalink
    Posted 15th August 2015 at 11:15 AM by oxoxbyx oxoxbyx is offline
  16. Old Comment
    cowboy99's Avatar

    GB F5 Guide (pcb version 2)

    Sorry for another heat sink question.
    But I've got some big Conrads MF35-151.5 that are 350x151.5x48 mm with a C/W for 80deg rise of .21
    I realize this isn't enough for all F5c 2.2 configs, but I'd like your opinion of what setup would work for 4 Mosfets cascoded in terms of rail voltage and bias limitations to fit these in safely. Or possible suggestions of forced airflow.
    Thanks
    Charles
    permalink
    Posted 14th August 2015 at 06:24 PM by cowboy99 cowboy99 is offline
  17. Old Comment

    Improving A/D perfromance of Sound Balster X-fi Music (SB1240) - and a Puzzle!!!

    How does this unit compare to other phono adc units that you know of? Behringer has one, and so does ART. Are you familiar with these?

    I'm interested in an ADC that will do the highest sampling rate possible. I'm open to a DIY, but I'm not an EE. I can solder and assemble, but electronic design isn't my thing.

    Thanks!
    permalink
    Posted 13th August 2015 at 05:54 PM by Harry Manback Harry Manback is offline
  18. Old Comment

    Superregs for your line-level projects

    Hi Jan,
    I'n a newbie so sorry for the dumb questions but I wand to be sure.
    To get 12VDC our (I just need + and return) and using your example of 1K value to Rbottom I would need 0.74 K for Rtop?
    Is R7 top and R6 bottom?
    What should be the VAC output of transformer?
    Thanks
    IK
    permalink
    Posted 7th August 2015 at 12:09 PM by IZHAKKATZ IZHAKKATZ is offline
  19. Old Comment
    abraxalito's Avatar

    Fountek (Rhyme Acoustic) active speaker A-100

    No, not fully discrete - rather a hybrid with opamps for gain and a fully discrete output buffer.
    permalink
    Posted 28th July 2015 at 02:58 PM by abraxalito abraxalito is offline
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