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Product: Lehmann Audio
DAC+ D/A converter and preamp
Manufacturer: Lehmann
Audio
Approx. price: 1,995 $ (check their site for EU
Countries price)
Availability: authorized dealers or directly from
the Web
TNT-Audio has already reviewed an audio component from this German HiFi brand, namely the famous phono preamp Black Cube, so for further infos about the company I invite you to read that review or to browse their brand new web site.
The DAC+ is a very
original HiFi component, it is a D/A converter including a small
minimalist hi-quality preamp with 4 digital inputs and 1 aux analog
one that can be used to connect the output of a phono preamp, for
example. No (analog) tape out outputs are available (just 3 digital
outputs), no tone controls, no balance, nothing at all. Just a solid
brass volume knob and a switch to choose between the 4 digital
sources and the analog one.
More precisely, the DAC+ has 4 digital
inputs: 1 optical (Toslink), 2 coaxial (gold plated connectors), 1
XLR balanced (Neutrik connector with gold plated pins). Then it has
an analog input (which accepts signals up to 9 V RMS) and 3 digital
outputs: 1 optical, 1 coaxial and 1 XLR balanced. Digital dubbings
are not affected by the selection of the analog input.
Taking a look at the
inside of the DAC+ (see the picture below) you'll find a very precise
layout and a large use of very hi-quality components: a Noble volume
control, WIMA MKS caps and Analog Devices op amps, a massive toroidal
transformer and an impressive power supply section.
The D/A
conversion section uses a Crystal 24 bit DAC (CS4390), different from
the old 20 bit chip (CS4329) which equipped the DAC+ reviewed by the
friends at Soundstage, for example.
The DAC+ offers a pletora of
pretty unusual features: the owner can customize his DAC+ to suit his
needs, for example: the volume control can be bridged so that you can
use the DAC+ as a standard D/A converter, the output caps can be
excluded from the signal path, if your power amplifier has a DC
offset filter in its input stage and the gain can be lowered by 6 dB
(default output at full digital scale is 4 V RMS).
Take a look at
the excellent layout in the picture below.
The cabinet of the DAC+ is just a plain solid black metal box (43 x 21.5 x 5 cm, weight: 5 kg more or less), with 4 tender rubber feet that help decoupling the unit from the "outside world". The ON/OFF switch is placed in the rear panel, close to the IEC mains socket. This means that it should be better to leave the DAC+, like any other D/A converter, permanently turned on.
It is also available a
simplified version of the DAC+, simply called DAC, which comes
without volume control and analog input. With the DAC you can save
few hundreds dollars but you lose the preamp feature which is, in my
opinion, very, very interesting as we'll see later.
I've tested
and evaluated the DAC+ over a long period, using it as a standard DAC
converter and also as a minimalist preamp.
I've tested the DAC+
both with the old 20 bit DAC chip and with the new 24 bit. For those
of you who are already familiar with the sound of the DAC+ I'd say
that the new 24 bit chip is a huge improvement over the old chip:
smoothness and clarity of the mid range improve and the air amongst
instruments and singers increases. In a word it is much more
"musical" and enjoyable.
Hence the following notes are
related to the 24 bit version only. For more infos and upgrades
please contact the manufacturer.
The DAC+ is a solid
state component, like its brother the Black Cube, but, while the
phono stage had a mix of transistor and tube sound features, the D/A
converter does nothing to hide its proud solid-state soul.
The
overall feeling is that of a taut, solid and punchy sound, like the
one of a good solid state powerful amplifier. More precisely, few
tube amps can rival the bass performance of a good solid state amp
and so is the DAC+ bass range: extened till the first octave, very
powerful, taut and articulated, don't be surprised to hear your
loudspeakers going lower than ever :-) (see the review on Soundstage,
for example). It is a nothing but excellent bass range, very close to
the best bass performance of a good analog turntable, if you know
what I mean.
Actually, in my opinion, apart from soundstaging and
overall "musicality", one of the big pluses of the LPs was
the bass performance and the dynamics. The DAC+ makes the CD sound
close to vinyl, at least for these two parameters.
Put a CD with a
well recorded double bass or organ and your listening chair will
tremble as well as your floor.
The DAC+ possesses also a crystal
clear mid range, with a good level of detail and introspection, not
exactly warm but never aggressive. It is very analytic, it lets you
discover each nuance of the recording and, of course, each error of
the recording engineer ;-)
It is NOT the warm and rounded sound of
certain D/A converters that try to mimic the sound of the vinyl
discs: it is a sound made of a clean and open mid range, matched with
a well extended and harmonically rich high range.
For example, the
harmonic richness of an acoustic guitar is preserved by the DAC+, you
can clearly hear the fundamental note and then the harmonics
expanding into your listening room.
While with the old 20 bit chip
the female voices were sometimes too edgy and plenty of sibilants,
with the 24 bit everything seems far more natural and, quite
surprisingly, this happens without losing any information in the high
range.
The voices appear much clearer and less artificial and
grainy (digital?) though there's clearly much more detail and "air".
Used as a preamp the DAC+ retains its solid state behaviour, showing its limits only when compared with hi-end preamps that are, alas, much more expen$$$ive. Given the price of the DAC+ the performance, as a preamp, is pretty outstanding.
Solid state at its
best here: the DAC+ is a NO FEAR HiFi component, it explodes (well,
not literally :-) ) into your listening room and, as mentioned
before, this performance puts its sound very close to the one of a
good turntable. A friend of mine, in love with my Linn analog
fron-end, when listening to the DAC+, has confessed that the CD CAN
sound "dynamically" close to the analog source even without
spending an arm and a leg on price-no-object D/A converters or
transports.
The dynamic performance is probably one of the best
qualities of this converter and it can rival with far more expensive
units.
Attacks are fast and decays are natural, with plenty of
"breath" and echoes...listen for example the KO-DO
Heartbeat Drummers of Japan (Sheffield Labs) playing the huge O-Daiko
drum: you'll clearly hear the vibration of the drum after it has been
violently hit by the player. A still open famous mathematical problem
is: can one HEAR the shape of a drum? My answer is YES, if the
converter is something dynamic like the DAC+!
When playing highly
dynamic recordings, take care of the listening level...or your power
amplier or your speakers may suffer ;-)
The DAC+ is good even when
playing difficult instruments like the harpsichord, where a great
amount of microdynamics is required: the harmonically rich texture of
its sound is a thrilling test for any HiFi component. The German
converter, thanks to its rich and detailed sound, succeeds in
following each delicate and sudden variation of the instrument,
giving you always a sparking musical reproduction.
As usual, the
soundstage reproduced by a component that is precise and detailed
like the DAC+ is nothing but excellently focused: to hear this you
should bypass the volume control and use the DAC+ as a standard
fixed-output converter. Indeed the DAC+ used as a preamp has a
slightly narrower soundstage and it seems that the D/A converter
section can play slightly better and more focused when the volume
control is bridged.
This is obvious to me, as long as a far better
preamp is used with the DAC+ working as a standard fixed output
converter. But don't get me wrong: when used with its internal volume
control it is quite impossible to detect the price range of this
unit...you need thousands of dollars of a separated preamp to "tell"
the difference. This leads to a pretty obvious question: the DAC+ is
a converter matched to a minimalist preamp and it costs less than
2,000 dollars: how many DAC + separate preamp combos in the same
price range offer the same sound quality? Very few is the answer,
especially if you consider the price of a good interconnects cable
which is necessary to link the DAC to the external preamp.
So, it
is true, the DAC+, used as a standard DAC, has a better focused and
wider soundstage than when the volume control is used...but the
question is, how many preamps can reveal this? I've discovered this
using the reference Thor Audio TA1000
preamp (7,000 $) and an Audio Research LS 15 preamp (soon on
TNT-Audio) so...it's up to you (or to your wallet) to decide :-)
As said before, it is
better to leave the DAC+ permanently turned on, it is a trick
suggested both by the recessed position of the ON/OFF switch and by a
non-written law on D/A converters (leave them on, they'll sound
better).
The DAC+, thanks to its tender rubber feet, sounds good
independently of the surface, provided it is sufficently stable and
solid. This is a sign of the good mechanical qualities of the layout
and of the cabinet.
Finally, a few words about the mains cable:
thanks God it is detachable so you can use any special audiophile AC
cord (for example, our DIY project Merlino).
The DAC+ designer, Norbert Lehmann, seems very interested in
equipping its products with better AC cords and I hope ANY HiFi
designer in the World will start thinking at the mains cable like a
COMPONENT of the unit itself which does affect the overall
performance.
Considering that the
DVD Audio seems here to stay, I'd like to see the DAC+ capable to
convert the new 24/96 digital format. I believe the designer is
already thinking about this possibility.
Secondly, a minor
complaint: the 4 different digital inputs can be selected by 4
microswitches in the fron panel, each one equipped with a red led
light. Now, the problem is that it is very DIFFICULT to remember
which numeber refers to the desired input so one has to look at the
rear panel, and switch the right button in the front panel. Things
are even worse since there are two coaxial inputs...it could be way
easier if the 4 switches, instead of being labelled with 1, 2 , 3 and
4, would have been marked with Optical, Coax 1 and 2, XLR.
As for
the sound quality: apart from the differences remarked above related
to the 3D imaging there's little to say about an HiFi component that
at a price of a DAC converter offers you a hi-quality
preamp....included!
Less than 2,000 $ for
a 24 bit DAC converter featuring 4 digital inputs and 3 digital
outputs (even XLR balanced!) plus an analog aux input, hi-quality
components (Noble, MKS, Analog Devices, Crystal), a toroidal
transformer and a huge power supply section...it sounds like a
bargain to me.
Then add the possibility to customize the unit to
suit your needs and to use it as the minimalist heart of your HiFi
system: 4 different digital sources (CD, DAT,...) plus an analog one
(turntable via a phono preamp)...it sounds like a better bargain to
me.
Then hook up the cables and listen to it: its sound,
especially for dynamics and quality of the bass range, can outperform
even more expensive DACs...if it is not a bargain, how would you call
it?
Norbert Lehmann proves
one more time that you don't need to spend outrageously amounts of
hard earned cash to enter the hi-end world. Of course, you need to
save on cool looks, gold plated knobs and massive CNC aluminium face
plates...but, after all, it's the MUSIC, stupid! (right, Steve?)
:-)
The Lehmann Audio DAC+: when Music really matters...
© Copyright 1998 Lucio Cadeddu http://www.tnt-audio.com
As usual, a huge thank you to Norbert Lehmann who has sent us the unit for this listening test and for having listened to my humble opinion about the 24 bit new DAC chip. Here's is his
Lucio,
thank you
for this brilliant write up about my DAC+ digital preamplifier. Once
again you proved that your *amateur magazine* really belongs to the
professionals as far as quality is concerned!
You also deserve a
huge thanks for waiting until you received the 24 bit chip.
In my
opinion there is nothing to say from my side about the positive
paragraphs in your review. I just can underline everything you wrote.
Referring to your complaints you are right, I _am_working on 24/96
but there are no concrete plans yet. I know that there are some
million cd-players to be improved. This is enough for a company of my
size :-)
A lot of people has spent huge amounts of money for their
standard cd players and will not immediately go into DVD or whatever
standard will break through for audio reproduction.
I've just
received a FI-article about forthcoming audio standards. Currently
there seem to be quarrels around the name and the exact format.
Believe me, when I finally will do something in that direction your
magazine will be among the first to be informed!
The source select
switches seem to be very special. Here's my explanation: I just
ordered them by _quality_ of the digital interconnect varieties
believing that XLR balanced interconnect is the first choice, then
come the two coaxial inputs and finally the optical TOSLINK input.
I
assume that in the meantime you are able to remember which source is
connected to which input aren't you? ;-)
One word about the jumper
options: I would like to state clearly that _only_ technically
trained persons should perform the modifications by placing or
removing the jumpers.
I think that the DAC+ indeed _does_ look
cool and the face plate _is_ CNC milled massive aluminium even
mounted with hidden screws to the chassis to enhance the plain and
pure impression.
I just believe that the DAC+ has to hide
optically in a setup of devices built by different companies.
Norbert Lehmann - Lehmannaudio - Owner
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