[SlimDevices: Audiophiles] Re: The what Dac question

2006-09-21 Thread moshulu

adamslim;137938 Wrote: 
> Moshulu, did you build the Monica yourself?  Easy?  For well under £100
> it looks close to a no-risk play.

I bought the whole board, peopled and tested.  All I did was to add a
couple of 1.2Ah batteries, a charger, switches, a capacitor, a voltage
meter, and an enclosure with connectors.  It was trivial.

I'm glad that I didn't try to people the board myself.  The traces are
tiny, and I would have needed a special soldering iron.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-09-21 Thread adamslim

Phil Leigh;132004 Wrote: 
> Please tell me this is a joke?
> If a 2Khz sine wave really looks like that staircase going into a wide
> bandwidth amp it will sound 'orrible! If you think that sounds better
> you've probably developed an affection for that particular type of
> distortion.

Well 2kHz is already quite a high pitch, so it seems that the visible
distortion to the waveform would be above not-bat hearing.  Bruce Wayne
won't be getting a Monica, but don't let that deter _you_!

Moshulu, did you build the Monica yourself?  Easy?  For well under £100
it looks close to a no-risk play.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-09-21 Thread moshulu

Here's an interesting review of the Monica2 NOS DAC:

http://www.positive-feedback.com/Issue27/monica_dac.htm

This writeup pretty much corresponds to my impressions of the
inexpensive Monica when used with an SB3.  I sincerely recommend this
DAC, especially to those who, unlike the previous poster, aren't cursed
with the uncanny ability to know what a waveform will sound like just
from looking at an oscilloscope trace.  Must be a horrible way to
live.

The question of ouput level deserves attention.  I happen to have some
very efficient speakers (Klipsch RF5, 99 db/W) and I listen to music at
moderate levels.  Still, I find myself operating near the top of the
volume range.  I'm currently putting together a grounded-grid pre-amp
to give myself a bit more room.


moshulu


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-29 Thread Phil Leigh

moshulu;131906 Wrote: 
> For an amateur like me, DACs are mysterious things.  After putting
> together my Monica2 (a battery-powered non-oversampling DAC that uses a
> single TDA1545A chip) I fed in a 2 kHZ “sine wave” signal
> from a test CD.  I looked at Monica’s analog output, compared
> with that of my garden-variety Denon deck (see link to picture below). 
> I should have anticipated what I saw, but I admit to being shocked. No
> way was I going to feed that ugly waveform into my nice,
> painfully-constructed, 300B monoblocks!  Still, what’s an honest
> DAC supposed to do?  All it has is the 44.1 kHz data samples;
> everything else is guesswork and interpolation.  For all it knows, the
> original sound WAS a step function.  In any case, I figured that the
> high frequency components in the steps were probably not going to be
> amplified in my monoblocks, transmitted through my cables, reproduced
> by my speakers, or heard by my ears.  The final proof, of course, was
> in the listening.  Monica produces a lovely sound, superior to the
> Denon deck and, IMHO, to the Squeezebox.
> 
> http://i47.photobucket.com/albums/f165/moshulu/DSCN0563b.jpg   
> [Top trace: Monica; bottom trace: Denon]

Please tell me this is a joke?
If a 2Khz sine wave really looks like that staircase going into a wide
bandwidth amp it will sound 'orrible! If you think that sounds better
you've probably developed an affection for that particular type of
distortion.

Of course, the amp will probably be doing the filtering of the 44.1khz
artifacts anyway...

I'd rather prefer my sine waves to look like sine waves.
(and PF is correct - that nice sine wave out of the Denon is not a
guess - it's the result of what looks like well-implemented anti-alias
filtering.

I note with some amusement that Philips themselves describe this device
as "suitable for a clock radio" - that sounds about right :o)


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-29 Thread P Floding

moshulu;131906 Wrote: 
> For an amateur like me, DACs are mysterious things.  After putting
> together my Monica2 (a battery-powered non-oversampling DAC that uses a
> single TDA1545A chip) I fed in a 2 kHZ “sine wave” signal
> from a test CD.  I looked at Monica’s analog output, compared
> with that of my garden-variety Denon deck (see link to picture below). 
> I should have anticipated what I saw, but I admit to being shocked. No
> way was I going to feed that ugly waveform into my nice,
> painfully-constructed, 300B monoblocks!  Still, what’s an honest
> DAC supposed to do?  All it has is the 44.1 kHz data samples;
> everything else is guesswork and interpolation.  For all it knows, the
> original sound WAS a step function.  In any case, I figured that the
> high frequency components in the steps were probably not going to be
> amplified in my monoblocks, transmitted through my cables, reproduced
> by my speakers, or heard by my ears.  The final proof, of course, was
> in the listening.  Monica produces a lovely sound, superior to the
> Denon deck and, IMHO, to the Squeezebox.
> 
> http://i47.photobucket.com/albums/f165/moshulu/DSCN0563b.jpg   
> [Top trace: Monica; bottom trace: Denon]

The "smoothing" of the signal done by a modern DAC is not really
guesswork. It reconstructs exactly how the signal would have looked
during A/D conversion after being bandwidth limited (prior to being
sampled) -as it must be to avoid aliasing effects.

The output from Monica, however, is the result of "sample and hold",
where the sample phase is represented by the leading edge of the steps,
and the hold phase is the horizontal sections. Now, the hold phase is
just an implementation detail (in DACs), and is not really something
that can be said to be part of any stored signal. (In theory, the
sample is taken at a specific time, and during an infinitely short time
period.)


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-29 Thread moshulu

For an amateur like me, DACs are mysterious things.  After putting
together my Monica2 (a battery-powered non-oversampling DAC that uses a
single TDA1545A chip) I fed in a 2 kHZ “sine wave” signal from a test
CD.  I looked at Monica’s analog output, compared with that of my
garden-variety Denon deck (see link to picture below).  I should have
anticipated what I saw, but I admit to being shocked. No way was I
going to feed that ugly waveform into my nice, painfully-constructed,
300B monoblocks!  Still, what’s an honest DAC supposed to do?  All it
has is the 44.1 kHz data samples; everything else is guesswork and
interpolation.  For all it knows, the original sound WAS a step
function.  In any case, I figured that the high frequency components in
the steps were probably not going to be amplified in my monoblocks,
transmitted through my cables, reproduced by my speakers, or heard by
my ears.  The final proof, of course, was in the listening.  Monica
produces a lovely sound, superior to the Denon deck and, IMHO, to the
Squeezebox.

http://i47.photobucket.com/albums/f165/moshulu/DSCN0563b.jpg   
[Top trace: Monica; bottom trace: Denon]


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-28 Thread konut

TiredLegs;131804 Wrote: 
>  There's a school of thought which says that a DAC's op amps make more
> audible difference then its digital chips.

Thats the school I've been attending.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-28 Thread TiredLegs

opaqueice;130436 Wrote: 
> Just FYI, there's a school of thought on this which says money spent on
> a DAC is essentially a waste.  The reasoning is that all reasonably
> modern DACs sound more or less the same.
I recently purchased a Dodson DAC-263, and have been doing various
comparisons between it, the DAC internal to the SB3, and my prior
Entech Number Cruncher 205.2 DAC. There are very substantial
differences in sound between them, and thus far, I'm thinking that the
Dodson might be the best audio purchase I've ever made. I never knew
how good my music could sound. (At some point, I'll get around to
posting a detailed comparison between these DAC configurations.)

Even if most modern DACs used equivalent quality digital converter
chips (which I'm not claiming), the analog sections in DACs vary
tremendously. There's a school of thought which says that a DAC's op
amps make more audible difference then its digital chips.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-24 Thread moshulu

ezkcdude;130721 Wrote: 
> So, I'm seriously considering buying the board. Yeo said he sells the
> oscillator for $20, which seems too much. What clock did you end up
> using?


I bought the whole board, oscillator included.  The total price seemed
reasonable to me.  Here are some pictures of my implementation:

http://i47.photobucket.com/albums/f165/moshulu/DSCN0567a.jpg
http://i47.photobucket.com/albums/f165/moshulu/DSCN0569a.jpg


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-24 Thread ezkcdude

moshulu Wrote: 
> This is a vote for Monica.  I bought the board from diyparadise, added a
> 12V lead-acid battery, connectors, switches, a case, etc.  The seller
> (in Indonesia or Malaysia, I can't remember) was very helpful and
> friendly.  I find a significant improvement over the SB3 analog output.

So, I'm seriously considering buying the board. Yeo said he sells the
oscillator for $20, which seems too much. What clock did you end up
using?


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-24 Thread PhilNYC

opaqueice Wrote: 
> There are differences, even among amps of the same type.

I just wanted to make it clear that I'm not in the camp who believes
all amps sound the same.  I simply posted a perspective that some
people have in response to the notion that some people also believe
that DACs all "sound pretty similar"...


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-24 Thread moshulu

ezkcdude Wrote: 
>  A cheap way to go is to think about getting a ready-made kit to build
> yourself. The Monica DAC (diyparadise.com) comes to mind. 

This is a vote for Monica.  I bought the board from diyparadise, added
a 12V lead-acid battery, connectors, switches, a case, etc.  The seller
(in Indonesia or Malaysia, I can't remember) was very helpful and
friendly.  I find a significant improvement over the SB3 analog output.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-23 Thread opaqueice

PhilNYC Wrote: 
> FWIW, there's also a school of thought that says most amps (of the same
> type) sound the same too.  YMMV...

There are differences, even among amps of the same type.  That's
something you can pretty easily test in an audio store - often they
have multiple amps hooked up so you can swap betweem them with the same
source and speakers.  There are significant differences...  but in the
same rooms you can swap speakers as well, and in my experience at least
the difference between amps is much smaller than between speakers.

This isn't surprising - speakers are the only component with moving
parts, with a response that depends on the room you put them in.  In
fact they're the only component that involve sound at all, and
acoustics is much more complicated and difficult than any electronic
circuit where you have precise control over every component.

Skunk Wrote: 
> 
> Not that I don't agree w/ a lot of what you said, but this seems like a
> poor test- ignoring instrument seperation, placement of the sounds
> between or around the speakers, ambience of recording venues, etc..
> 

What Phil said.  In any case I agree it might not be the best test to
determine which you prefer once you know there's a real difference. 
But to see if there's any perceptible difference at all it's fine.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-23 Thread Phil Leigh

Skunk Wrote: 
> Not that I don't agree w/ a lot of what you said, but this seems like a
> poor test- ignoring instrument seperation, placement of the sounds
> between or around the speakers, ambience of recording venues, etc..

Actually it's a very good and very revealing test. Please don't be
mislead into thinking that (what I call) the "dual-mono test" is ANY
less revealing than stereo. What we hear is only an approximation
(albeit a reasonably convincing one some of the time) of ambience,
imaging etc anyway. Try it with a mono recording...

As for depth and height - I think we've done those "concepts" to death!
(I know you didn't mention them - but someone will)

If you don't believe me, try it (if you have 2 dacs). At the very least
you will find the results interesting - if not surprising.


Phil


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-23 Thread ezkcdude

So, let me get this straight. All DACs and all amps sound the same.
However, it *does* make a huge difference if you do the "63 mute"
trick? Rod Serling would be proud.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-23 Thread PhilNYC

opaqueice Wrote: 
> Just FYI, there's a school of thought on this which says money spent on
> a DAC is essentially a waste.  The reasoning is that all reasonably
> modern DACs sound more or less the same - witness the fact that the DAC
> chips themselves are extremely inexpensive, which is an indication that
> the technology is mature.  On the other hand amplifiers and (to a much
> greater extent) speakers vary considerably.  Finally, in my experience
> room correction has a far, far bigger effect on sound then changing the
> DAC.
> 

FWIW, there's also a school of thought that says most amps (of the same
type) sound the same too.  YMMV...


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-23 Thread Skunk

opaqueice Wrote: 
>  You can test it head to head with the SB DAC by sending the same out
> (say the left) from each to the amp and then playing with the balance
> (if you have one) or just putting your head next to each speaker in
> turn.  I'll be surprised if you hear much difference, possibly apart
> from a volume mismatch.

Not that I don't agree w/ a lot of what you said, but this seems like a
poor test- ignoring instrument seperation, placement of the sounds
between or around the speakers, ambience of recording venues, etc..


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-23 Thread opaqueice

fatfred Wrote: 
> Have some good reading from thread. Many of us seem to tend towards
> newer dacs up to date components and some belief that chinese dacs are
> providing quite equivalent performance at a good price point.

Just FYI, there's a school of thought on this which says money spent on
a DAC is essentially a waste.  The reasoning is that all reasonably
modern DACs sound more or less the same - witness the fact that the DAC
chips themselves are extremely inexpensive, which is an indication that
the technology is mature.  On the other hand amplifiers and (to a much
greater extent) speakers vary considerably.  Finally, in my experience
room correction has a far, far bigger effect on sound then changing the
DAC.

So my advice is to put the money into speakers if you're buying them,
or into a TacT amp or measurement mic plus Inguz' plugin.  If in the
end you buy a DAC, at the very least get one with a return policy.  You
can test it head to head with the SB DAC by sending the same out (say
the left) from each to the amp and then playing with the balance (if
you have one) or just putting your head next to each speaker in turn. 
I'll be surprised if you hear much difference, possibly apart from a
volume mismatch.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-23 Thread fatfred

Have some good reading from thread. Many of us seem to tend towards
newer dacs up to date components and some belief that chinese dacs are
providing quite equivalent performance at a good price point.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread PhilNYC

Ok...I have never heard a stock Zhaolu (only tianguis' modded one), so I
was just going on what I had read/heard from others.  The modded one
sounds great!


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread CFP

PhilNYC Wrote: 
> FYI - a guy who has a modded Zhaolu sent me a message saying that the
> mods to entail more than just part upgrades (although not a whole lot
> more).  The point still holds, however, that the stock Zhaolu probably
> won't get you much (if any) improvement over the SB's analog output...

By no means does one have to "mod" the Zhaolu for it to sound good. 
The general consensus on other forums is that the "stock" Zhaolu 2.0
compares very favorably against other DACs such as the Benchmark,
Lavry, etc - especially for the price.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread tianguis

Phil:

Not my experience! Even the stock Zhaolu was an improvement over
the SB3 analog output. Now, modded, it's no contest.

Larry

PhilNYC Wrote: 
> FYI - a guy who has a modded Zhaolu sent me a message saying that the
> mods to entail more than just part upgrades (although not a whole lot
> more).  The point still holds, however, that the stock Zhaolu probably
> won't get you much (if any) improvement over the SB's analog output...


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread ezkcdude

fatfred Wrote: 
> I am tempted by the Nos dac from derek shek as I think that this may
> bring something to the squeezebox table. What I'm looking for I guess
> is detail and natural presence. I have also been offered a Counterpoint
> dac for slightly more money. Has anyone had experience with these? I am
> not a rich man and want to make sure this is money well spent. The
> transporter is out of reach today but will be edging towards one next.

I have the Shek DAC (see my sig)! It's been great. Derek is a great
guy, too. I blew the regulator on my first one, by reversing polarity
on my power supply, but I sent it back to him and he fixed it for me at
no cost (just shipping). Highly recommended. A cheap way to go is to
think about getting a ready-made kit to build yourself. The Monica DAC
(diyparadise.com) comes to mind. There are a bunch of kits being sold
over at diyaudio forums. For what it's worth, I'm now designing my own
DAC (it's an upsampler). If nothing else I've learned a heck of a lot
about how these things work, and I highly recommend that anyone really
interested in these matters to research how DAC's work before plunking
down big bucks. It may make you think twice.


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Halo A23 125W/ch amplifier->Speltz anti-cables->DIY 2-ways + Dayton
Titanic 10" subwoofer

He's not hi-fi, he's my stereo.

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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread dwc

Another set of nice nonOS dacs coming out of Taiwan.  I have the first
generation Renaissance and I find it sufficiently detailed, while also
sounding natural.

http://cgi.ebay.com/TDA1543-Non-OS-Vacuum-Tube-DAC-Renaissance-II_W0QQitemZ120018448077QQcmdZViewItem

-Dan


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread PhilNYC

FYI - a guy who has a modded Zhaolu sent me a message saying that the
mods to entail more than just part upgrades (although not a whole lot
more).  The point still holds, however, that the stock Zhaolu probably
won't get you much (if any) improvement over the SB's analog output...


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread PhilNYC

mlihl Wrote: 
> You might want to try a Chinese DAC such as the Zhaolu or Great March.
> Most use up-to-date converter chips and fine parts. I know of at least
> one person at headfi.org who prefererred the $200 Zhaolu over a Lavry
> and Benchmark DAC...You can't go wrong with a good Chinese DAC IMHO.
> You can get them from HK via Eddie Wu (www.diykits.com.hk/dac.html)
> 
> Regards,
> 
> Mike

Most of these guys with the Zhaolu DAC are modding them; the mods
aren't expensive (just replacing some parts with better parts), but
you'd still need to do it (or find someone to do it for you) to get
better performance than the SB's analog out.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread stevo

Struth - you would think I could read the "NZ" in your avatar!

China is not that far away either

Stevo


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread fatfred

stevo Wrote: 
> No shortage of DAC's around. I wonder what this one is like;
> 
> http://www.perreaux.com/product.php?idp=52
> 
> It's from New Zealand so I thought I should mention it although I don't
> own one.
> 
> Stevo
Have looked at this previously and it gets a reasonable review 

http://www.audioenz.co.nz/2005/perreaux_sxd2.shtml
There appears to be little review of this from further a field. This is
Perreauxs first foray into the dac world being predominantly an
amplifier maker. This dac costs about $600 us making it quite abit more
expensive than the greatmarch etc.Could possibly source one to trial and
be patriotic.

dave


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread stevo

No shortage of DAC's around. I wonder what this one is like;

http://www.perreaux.com/product.php?idp=52

It's from New Zealand so I thought I should mention it although I don't
own one.

Stevo


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread fatfred

mlihl Wrote: 
> You might want to try a Chinese DAC such as the Zhaolu or Great March.
> Most use up-to-date converter chips and fine parts. I know of at least
> one person at headfi.org who prefererred the $200 Zhaolu over a Lavry
> and Benchmark DAC...You can't go wrong with a good Chinese DAC IMHO.
> You can get them from HK via Eddie Wu (www.diykits.com.hk/dac.html)
> 
> Regards,
> 
> Mike

Cheers for that Mike. I was listening to some nice Shengya kit on the
weekend. It does seem that there is some audiophile stuff coming out of
china/hong kong. Do the forum members think that modern chips and builds
will have it over older high-end kit?
Going to having a close look at lite ah dac60, greatmarch and derek
shek

)P( I appreciate your feedback on the derek shek. In a mildly obsessive
pre purchase info frenzy at the mo and your comments help.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread mlihl

You might want to try a Chinese DAC such as the Zhaolu or Great March.
Most use up-to-date converter chips and fine parts. I know of at least
one person at headfi.org who prefererred the $200 Zhaolu over a Lavry
and Benchmark DAC...You can't go wrong with a good Chinese DAC IMHO.
You can get them from HK via Eddie Wu (www.diykits.com.hk/dac.html)

Regards,

Mike


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread fatfred

Patrick Dixon Wrote: 
> NOS DACs are not know for detail, but they do sound quite natural and
> unfatiguing.
> 
> No idea on the other one.

Thanks for that Patrick. I am presently running the Squeezebox into 
a early Plinius solid state amp and onto a pair of Rogers ls6a
speakers. Quite an old school system for the back end. I trialled a
cambridge 640c cdplayer last year and thought this had a great sound. I
love the system I have now but feel there is enough positive comment in
forums to suggest an external dac could improve this. A benchmark is
too expensive and dacs such as dereks are buy then try. Info such as
yours is much appreciated.


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[SlimDevices: Audiophiles] Re: The what Dac question

2006-08-22 Thread Patrick Dixon

NOS DACs are not know for detail, but they do sound quite natural and
unfatiguing.

No idea on the other one.


-- 
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www.at-tunes.co.uk

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