Lampizator Atlantic 2 TRP User manual

The Atlantic 2 TRP
LampizatOr DAC – User Manual
Tube Rollers Paradise

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LampizatOr- ATLANTIC2 TRP DAC Manual
WARNING: as every DAC comes with a 7 days testing period (please to confirm it - ask
your dealer first), during this time it is not allowed to open the DAC. The screws are
protected with a seal. You have to decide, if you like the sound and you want to keep it.
After the 7 days period expire – your DAC is a keeper, and you may open the hood. This
does not invalidate the warranty, however – any modifications – no matter how small –
invalidate the 5 years warranty. Changes, upgrades and mods must be pre-authorized in
writing, even tube change. DACS returned during the test period with the seal broken will
not be refunded and will be sent back.
THE SHORT MANUAL
1. Plug in
2. Enjoy!
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Contents:
The description of REMOTE CONTROL 4..........................................................................
A quick guide to a smooth start 5........................................................................................
Introduction 6.........................................................................................................................
Data formats 6........................................................................................................................
Audio volume level 7.............................................................................................................
The heat issue 8.....................................................................................................................
Optimal placement 8.............................................................................................................
Power on-off cycle 8..............................................................................................................
Cabling and cable handling 9...............................................................................................
Tube rolling and replacement 10.........................................................................................
Atlantic TRP tube rolling guide 10.......................................................................................
Rectifier Rolling 13................................................................................................................
Aging problems 14................................................................................................................
Fuse Change 15.....................................................................................................................
Volume control 16.................................................................................................................
COOPERATION WITH THE PREAMP 17..............................................................................
DIGITAL INPUTS 17...............................................................................................................
The TOSLINK connection 18................................................................................................
USB playback 18....................................................................................................................
MAC OS operation of USB output: 19.................................................................................
LISTENING TO THE MUSIC 22..............................................................................................
Block Diagrams 28................................................................................................................
SOME Q & A 30......................................................................................................................
I PLUGGED EVERYTHING BUT I GET NO SOUND 31........................................................
Rear panel layout 32..............................................................................................................
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The description of REMOTE CONTROL
functions for “Kallas” systems
ON powers up/down the whole DAC but the Remote Control
processing circuit remains powered even after switch off . If you
switch off by the rear power button - it also powers down the remote
circuit therefore it will be impossible to switch the DAC on via remote.
VOL+ VOL- changes the volume from complete MUTE (-63 dB) to
complete bypass - 0 dB in 64 smooth steps.
Input - and Input +- changes the analog and digital inputs to the tube
section.
MUTE does just that - mute. After pressing again - the DAC will go
back to the last volume used. Touching the Vol-Up and Vol Down
functions will un-mute automatically.
The volume levels (last used) are remembered.
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IN—
IN +
MUTE
VOL -
VOL +
Lampizato

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A quick guide to a smooth start
THE RING BUTTON
In all DACs up to serial #500 the ring button used to be just the mains power switch. After
that we started using the ring for other purposes, namely - for whatever we think will be
most useful to the listener (in non-volume DACs).
If your DAC is a non-volume type (without display) the ring button can be:
1. Power button if there is no power toggle at the back right next to the IEC AC power inlet
socket. This comes PER REQUEST ONLY as 99% of DACs the ring button does USB.
2. USB to NON-USB switch.
3. DSD to non-DSD switch on dacs equipped with DSD separate engine. DSD must be
selected by hand.
4. Other, but only if agreed with the user. Like SPDIF - TOSLINK or MUTE
VOLTAGE: All DACs are shipped with the voltage of MAINS according to the country of
destination. If you bought the DAC second hand and you are in different voltage zone - the
DAC can be converted by a qualified technician. There is also a switch at the back
allowing user to select mains voltage. We need to change transformer windings
arrangement of the primaries.
It is not necessary, but advisable that the power cable used is a quality one, not simply
a computer cable. It is also advisable to use some kind of AC filter – in many cases this
brings nice results. Generally under-filtering is better than over-filtering.
Due to multitude of AC plugs around the world - we dont supply any AC cable at all.
TOGGLE SWITCHES
All toggle switches are safe to use even if by mistake. Dont be afraid to throw a toggle if for
example you get no sound while you think you should.
We orient our toggles physically so their position and orientation of the lever corresponds
to the placement of the respective input or output.
Example: if the toggle is marked USB-SPDIF - the lever towards USB means USB is
selected, lever towards the RCA means RCA is selected. Same for Toslink, AESEBU, BNC
etc.
The USB selector - selects USB against “all other digital inputs”. Only then “all others” can
be individually selected by the respective switches. USB selection to USB overrides all
other inputs.!
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Introduction
Thank you for choosing Lampizator DAC. We created it with huge research effort to
deliver not only world class musical performance, rivalling the most expensive DACS
money can buy, but also to offer very long life of the product. Simply speaking – if you
adhere to some basic precautions listed below – the product should last a lifetime and
hopefully in this period – will never be outperformed by a competing product.
“Whose lifetime?” one might ask – well – let’s not go into details – enough to say it
should work flawlessly for the foreseeable future.
The DAC should be future-proof. Shall we ever launch a major upgrade to the digital
part – you can get the upgrade at very reasonable cost. Shall you decide you need
some added features – you can also get them at reasonable cost anytime in the future.
Be it AES/EBU input, Toslink input, BNC input, XLR outputs, volume control,
information status LEDs – any option you initially forgot.
We can’t be 100% sure, but it is extremely unlikely that the market and the industry in
the future will embark any technology of music storage faster than 192 kHz and with
more resolution that 24 bits. We already hit the human ear limits, not to mention the
real needs of mass consumers (MP3).
Data formats
The DAC is capable of automatic recognition of all sampling rates from 44 to 760 kHz
and bit rates from 16 to 32. Since few if any transports offering SPDIF format of the 192
kHz exist in the consumer market, it is hard to guarantee the operation but on the
professional ones which we tried – it worked. From our experience the transmitters of
SPDIF are incapable of making good square wave over 48 kHz, so if you play a 192
kHz file, be aware that on one hand you “play” more detailed data, but at the same time
your signal is waaay more distorted so at the end of the day for this reason alone it
may not be worth it to chase the hi-rez rabbit.
If you use USB connection, all our DACs will play up to 760kHz and 32 bits. This
theoretical limit does not imply that you need RECORDINGS of that resolution, which
don’t exist by the way, but that you can use up sampling to play regular files. We
however listen to all recordings at the resolution settings they were recorded.
By PCM files we mean all known file formats like: MP3, MP4, Aiff, Flac, WMA, WAV,
Ogg, and many more less known types. PCM abbreviation stands for pulse code
modulation.
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DSD
Direct Stream Digital, also known as DSD format - this format is not new as many
people think, it is as old as digital but it wasn’t used for consumer audio or home audio
- before. It became very popular after 2010 and continues to make its way into our
homes. It is VERY different than our well known PCM format as found in our CD files,
MP3, FLAC or WAV - AIFF. It encodes the music in the data stream differently, looks
different and sounds different. It is the format in which the SACD discs were recorded
and a format in which the analog master tapes were backed up by record companies. It
is currently the format in which the master recordings are made in record industry.
In ATLANTIC2 TRP DAC - we use AUTOSENSING and automatic switch from DSD to
PCM and back. Used doesn’t need to do anything, just enjoy.
Atlantic DAC will automatically recognize and switch all DSD speed rates from normal
64 SACD format to 2x (128x) and quad 256x format all the way to 512 is supported.
Audio volume level
Tube technology allows us to set practically unlimited volume level at the output, up to
10 x higher than from a normal CD player. We have decided to adhere to one internally
set standard: the test tone of 1 kHz at -20 dB produces an output of sine wave 300 mV
AC under the amp load of 47K. Thats equivalent of circa 3 V pp. Shall this be
inconvenient for some reason – it is adjustable in the range of 0-1800 mV by just one
resistor change. The test tone is available from me via email in the form of WAV or
AIFF or FLAC or MP3 file.
Generally - we prefer the sound of the DAC with high output levels, and most amps
don’t have any problem with that. A simple potentiometer or stepped attenuator takes
care of that. Only solid state chip based preamps will saturate and distort thats why we
need to know in advance about such solid state chip volume system being driven by
the DAC. We will keep then the volume level at the “book” level of 2 V pp. Having said
that - chip volume systems and preamps with opamps belong in home theatre (cheap
one) and DEFINITELY not in high end.
LampizatOr DAC should not be used with opamp based preamp, no matter how good.
Because the op-amp feedback loops will remove the whole joy of music as delivered by
the tubed DAC.
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The heat issue
Many people are concerned about the heat inside the player.
We want you to relax about it - that this is NOT an issue. The DAC operates well below
half of its maximum allowed temperature. Tubes are DESIGNED to be hot, this is their
very nature. Thats why they have internal heaters and when they are not at optimal
operating temperature – they sound bad.
The other components are guaranteed up to 105C and we are expecting no more than
45 degrees Celsius in the air inside the DAC.
Our only advice is do not heat the box additionally by placing it - for example - on top of
a hot class A amplifier. Give it some space around to allow free air flow and adequate
cooling. Do not cover it with blankets or mats.
Optimal placement
Apart from the heat issue as described above, the DAC has no special placement
requirements. Just remember to keep the S/PDIF cable not longer than 1,5 m (5 feet)
and RCA chinch cables – not longer than that either. USB cables should not exceed
2m and MUST NOT have ferrite filters on them.
Since tubes are microphonic, they hate vibrations. Therefore it is forbidden to
place the dac on top of the speakers or a sub. Choose least vibrating location,
preferably one foot behind the plane of the speakers.
Power on-off cycle
The tube lifetime, almost like the life of a car engine in cold climate – is determined
largely by the on-off cycle. The heat expansion coefficient of the glass is so much
different than that of the metal, that the air-tight seal of the metal pins can leak oxygen
inside the tube and eventually kill it. Even if it is just one molecule per day. So in other
words it is better to keep the DAC always on, than to switch it on and off more than
necessary.
The lampizator DAC with tube rectifier (Atlantic PLUS) has a slow start feature which
brings the high voltage supply gradually up, at the rate of two- to five volts per second.
The PSU reaches 250 V DC after 90 seconds. This helps to extend tube life. The DAC
is also equipped with voltage down feature (bleeders) which reduce the power voltage
upon switch-off at roughly the same rate.
On top of that – the tubes are operated always around 25% of full nominal power,
which greatly increases their life expectancy. Combining all the factors together, the
tube lifetime should be anywhere between 10 and 20 years, assuming the player is
switched off only once per day, for the night.
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Additionally all our DACs have special heater circuits that slow down the inrush current
by the factor of 10 and protect the heaters (cathodes) from developing spots and
blemishes that cause metal erosion and eventually death (of the tube). Our circuit goes
way beyond the tube datasheet recommended protection. It extends the tube life at
least double versus the datasheet specs.
Cabling and cable handling
Just to be sure that we know what we are doing:
- AC cable can be freely plugged and unplugged during operation. It is OK for the
DAC but NOT OK for the amplifier and speakers. A loud thump may appear after
switch off. Please turn your volume fully down before switching off the DAC.
- SPDIF cable should be plugged and unplugged when the transport is powered off.
The DAC can be on. However doing it on „hot” when all is working – is not
dangerous for the DAC as long as the AC power supply has the GND for all
products (DAC, transport, amps).
- Signal cables can be plugged / unplugged with the amplifier volume turned fully
down. XLR cables can be unplugged and plugged at any time because it is in their
professional nature to do so.
Please use a decent AC cable. We suggest spending around 100-200 Euro for a good
AC cable, not more but not much less. The free AC “computer grade” cables are not
good enough for serious audio.
Please use a decent digital interconnect. In our DAC it is completely unimportant what
is the wave characteristic impedance of the cable (the famous 75 Ohms). Just use the
cable that sounds good to you. Analog as well as digital interconnects can be tried.
Best results are obtained with silver cables. Let your ears decide, not specs of the
cable.
Lampizators produces all types of cables for audio systems - you can order them
from us with confidence of tremendous value for money. To beat our cables you
need to spend 2000 Euro per one. !
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Tube rolling and replacement
W took an expensive and painful decision to sell the DAC with the best tubes we can
find in consistent sustainable supply. Therefore we feel you should not be tempted to
change them for any reason.
If you feel that you MUST try other tubes – we need to pre-authorize it in writing.
Otherwise you loose the warranty, sorry.
It is possible to order the special version of DAC for tube rolling fans. It will have
specially configured multiple sockets to enable the use of almost any existing tubes -
from 6SN7GT to e182cc or EF80 or VT99.
Atlantic TRP tube rolling guide
The “music” tubes are pentodes in single ended triode mode. The use of tetrodes is
also possible
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For rolling we must observe some basic and simple principles"
1. The tube must be OCTAL BASE, and novals like EL84 or Loctals can be used with
base adapter
2. The heater of this DAC provides DC heating in 6,3V DC supplied to pins 2 and 7.
This is the CRITICAL parameter - only pins 2 and 7 are heaters. Our limit of current is
2A per tube.
3. 1Since the tubes work in Single Ended Triode mode with Anode Loading (Anode
Follower fashion) the voltage on anodes is dropped by the load to 50-80V DC only.
However with amaged tube or no tube at all, the voltmeter will read 240 VDC on anode
pin 3.
4. The bias of our system is automatic which means it is provided bu the cathode
resistance and noit by means of external biasing voltage source (manual bias). "
Our solution prevents the tube from runaway scenario (big current) even under most
extreme cases of failure or component damage - the tube is safe.
5. Our system will accept wildly broad spectrum of tubes from the smallest (EL84 with
adapter) to the biggest of them all - KT170.
No adjustements of any kind are necessary.
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Known tube types:
EL34, KT66, KT88, KT90, KT120, KT77, KT150, KT170, 6L6, 6V6, 6550, 6CA7, 5881
There are countless name and data variations, dont forget this tube has been
manufactured for 90 years already in 8 countries.
Interesting history can be found here: http://www.jacmusic.com/KT88/kt88.htm
Here are some practical tips for tube rolling:
1. Tube compatibility- many people ask “is the tube X compatible with Y?” and the
answer is of course - it depends. Tubes can have completely different bases but be
compatible by parameters and can be swapped by means of an adaptor. A good
example are ECC40, and 6SN7GT - different bases but very close parameters. Or
ECC88 and 6DJ8. Or 6H8C and 6N1P.
2. Other scenario is when the tubes have same base (say - noval) but they have
different pinouts. So we CAN NOT inter-change the two tube types but we CAN use
an adaptor. Same base type and same pinout DOES NOT MEAN that the tubes are
interchangeable - best example is cc81 and cc82 - same base, same exact pinout
but completely different parameters. Or octal 6SN7 and VT99 - both octal, same
parameters, different pinout.
3. Some tubes can have same base, same pinout and same parameters except the
different heaters. Best example is ECC82 and 12BH7 - the former uses half heating
of the latter. They can be used with a switch or within limited timing or with extra
care, depending on the heater arrangement in our DAC. Another example are
completely different tubes that miraculously are perfectly interchangeable - like
E182CC with 5687.
4. DHT triodes used in our Level7 and Big 7 DAC are yet another can of worms. Most
DHT tubes have the same base (four pin) and the same pinout (two fat legs are
heaters and cathode, two slim legs are Grid and Anode. The problem is that these
tubes have completely different heater demands. Our DAC7 is designed to accept
ALL KNOWN dht triodes from this group: 101D, 45, 245, 345, 6A3, 2A3, 300B.
People keep discovering more and more compatible triode types every month.
How is it possible to run so many triode types in one circuit ? DON’T THEY HAVE
DIFFERENT HEATERS ?
Our genius circuit automatically detects the current demand and adjusts voltage
accordingly. We added a switch which divides the tubes into two groups: high heaters
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and low heaters. High heaters are 2A3, 300B, 6A3 PX-25 and low heaters are 101D,
45, 245, 345, PX-4, 242.
ATLANTIC DAC in standard form uses Soviet 4P1L DHT pentode in triode mode. It has
an LOKTAL BASE which is unique. It also uses unique pinout and unique heater
voltage and current therefore ATLANTIC tubes can not be rolled at all. There is only
one brand and one version.
We supply the tubes that are purchased new from reliable sources. They are tested
and matched. They are the best sounding tubes we know and rolling them, even if
possible, would make no sense.
PLEASE VISIT OUR AFFILIATED SHOP FOR BEST TUBES: WWW.BEST300B.COM
Rectifier Rolling
Rectifiers are generally less rolled but many customers report that huge leaps in synergy
can be achieved when, after choosing the optimal music tubes, we also choose optimal
rectifier.
How can we tell the rectifiers ?
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Directly heated diodes are older in design, physically larger, and have 4 pins versus 5
and use 5V heaters versus 6,3.
PINOUT: 2-8 is heater 5,0 V AC. Pin 8 (or2) is also cathode. Pins 4 and 6 are two anodes.
Other pins - even if existing - are not connected. To test - just use a meter and check
resistance in ohms between the pins. IN A RECTIFIER THE ONLY TWO PINS WHICH
SHOW ANY OHM READING AT ALL, ARE HEATER PINS. THE READING SHOULD BE
IN SINGLE OHMS like 2Ohm.
Some people report back that the directly heated diodes sound better than their indirectly
heated counterparts, but this hasn't been verified in any semi scientific way. Generally we
expect the directly heated diodes to have up to 400% higher current capability as well as
voltage max. It al depends on the DEMAND of our circuit. Some Lampizator tube stages
demand only 2 mA in total, some can demand 40mA and more. Atlantic DAC demand in
total for 2 channels is 20 mA for SE or 40 mA for balanced version.
Rectifiers compatible: 274B, 5c3s, 5Y3, 5r4, 5U4G, GZ34, 5c4s, 5u4c
Rectifiers can be changed safely during playback."Just grab them by the base.
To change music tubes you must switch off the amp. DAC can continue to work.
The rectifier can be changed safely DURING LISTENING without even turning down the
volume.
Aging problems
As already explained above, the DAC should age very very slowly.
The digital PCB should last a lifetime. The transformer, the paper in oil caps, the
cables, plugs, sockets – should last a lifetime. There are only 4 electrolyte caps which
we selected from premium brands and they should last circa 25-30 years. Other than
that we suggest to change tubes every 10 years.
So - short of a thunderstrike – we expect no failures or ageing problems before 20-30
years.
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Fuse Change
The DAC is equipped with a non-repairable 20 mm glass fuse circuit breaker inside the
IEC-AC socket at the back. There is also one spare fuse provided in the little drawer
removable when changing the fuse. The fuses are 1,6A (or 2A for USA/Japan/Taiwan)
they are slow blow, and overrated by the factor of 3. Therefore it is impossible for the
fuse to blow without a specific reason - a failure inside the player. Consequently, if the
fuse burns, it is a signal to send the dac for service and NOT change the fuse.
Obviously the second fuse will burn as well.
WE ABSOLUTELY DO NOT ALLOW changing the fuses for any larger size than 1,6A
or installing the “audiophile silver bolts” in place of the fuse. Fuses are there mainly to
SAVE YOUR LIFE. And we mean that. You can experiment with audiophile grade
fuses but not DEAD BOLTS please.
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Volume control
The volume control is an extremely nice module, that changes the way we use the
DAC. The module consists of 5 elements:
1. Power supply with the DAC power management relay, allowing to switchON/OFF
the whole DAC via the remote while keeping the volume module powered.
2. The display - amber backlit 2 x 16 alpha LCD, which is our GUI.
3. The microprocessor board with memory, firmware and the chip that controls the
relays
4. Relay volume board with resistor ladder. The microprocessor connects the resistors
in such way that they form a resistive attenuation L-Pad with 63 steps of logarithmic
attenuation. The overall impedance is held at almost constant 30k and the steps are
calibrated in 1 db distances.
5. The virtual potentiometer with push action called the encoder.
The module is capable not only of volume adjustment but also of the input selection-
both analog inputs as well as digital.
Using the volume module: Press the volume knob down for 3 seconds and the display
will show selection of 4 analog inputs . Turn the knob to select the desired input. Press
for 3 s again to exit this menu.
The input selection is available from the remote in direct mode - just press digit 1 to 4
to choose input or use left - right cursor buttons.
MUTE function: this is useful to use instead of turning the volume all the way down.
Available ONLY via remote.
POWER OFF - the DAC will be switched off fully but the remote module will be always
alive to enable you to power it ON again.
*** Do not be upset about the “C-2018” text - it means the date the firmware was
written for this module and not the year of manufacturing of the DAC.
0dB operation: at full volume - 0dB the DAC operates as if there was no volume
module. This position is recommended for systems with own volume control: preamp or
integrated amp. The resistor ladder is completely by-passed.
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COOPERATION WITH THE PREAMP
The DAC with volume control should sound audibly cleaner and more direct without
any preamp between the DAC and the amp. The preamp, however good, will veil a lot
of the DAC’s natural clarity, speed and directness. If you feel you need the preamp
nevertheless, use DAC at the full volume or order your DAC without volume module.
The load presented by the preamp or amp or simply the next analog component that
the DAC sees, should be as high as possible. It is measured in kilo-Ohms and 100Kilo
Ohms is a perfect ballpark value. More is VERY rarely seen. 47 K is next common
value, and it is great too. 20 K is kind of on a low side, but we can handle that. Lower
than 20k is bad news. We must configure the DAC with additional cathode follower
buffer stage.
The DAC will not be damaged in any way, but at around 10K of load the dynamics of
the dac will start to fade away.
Having said that - every properly designed amp or preamp keeps the load value above
40k. And if it doesn’t - we simply don’t choose such amp because it was not designed
with audiophiles in mind.
DIGITAL INPUTS
There are three data types that our DAC can read internally: biphase, i2s and USB.
The bi-phase can come in many forms, but the most common are:
S/PDIF (sony/Philips data inter face) by means of single ended square wave of
amplitude around 0,5 V pp
AES/EBU - the same as S/PDIF but the signal is a mirrored (balanced) pair of square
waves around 2,5 V pp (max. 5 V pp)
TTL - just as S/PDIF but 5 V pp
TOSLINK - a fiber optic transmission of S/PDIF producing at the DAC the 5 V TTL
electrical signal.
RS422 - it is practically the same as AES/EBU
The i2S is the same as biphase but separated into 4 signals - each carrying only one
type of information. Biphase encodes 4 groups of informations in one signal stream.
Specifically they are: System Clock, Bit Clock, Left/Right Clock and Data. We can
install these four in any type of connector, because there is no standard. Most
customers use RJ45 LAN socket or simply four RCA sockets just like in TV RGB.
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The TOSLINK connection
Is toslink bad or not ? That is the question. Like everything in life - it can be bad or it can
be good.
By using own experiments and oscilloscope observations we concluded, that Toslink is not
bad and not inferior to RCA SPDIF if implemented properly. Toslink is EXTREMELY
demanding about the power supply quality. That’s why we build for toslink separate
dedicated power supply and with this supply the response is instantaneous and there is no
deformation of square wave. Usually Toslink ports are installed in cheap low end gear and
the power supply to Toslink is completely neglected. Not in LampizatOr DAC. If you have
Toslink in your DAC you can be sure it will sound good and not degrade the sound. Of
course providing that the transmitter part of the link is at least semi decent.
NOTE: All Apple products which have headphone output (iMac, MacBook, Power MAC,
MAcMini, iPhone, iPad, iPod) - have a secret toslink transmitter hidden inside that port.
Just buy the special cable - Toslink Minijack and when placed in the headphone output of
an Apple product - will emit light with SPDIF in it. That is a very good way of using MAC
computers as transports.
USB playback
USB data requires installation of additional converter
module to convert the “packet” data into a steady i2S
stream. Our asynchronous converter has internal RAM
and two own clocks and own power supply and own
power transformer secondary winding.
The USB module requires a driver for Windows to
recognize it. MAC OS and LINUX work without any need
for extra drivers.
We use three vendors of USB modules:
For ATLANTIC2 we use “JL” USB module: the driver is at:
http://www.jlsounds.com/drivers.html
Our USB converter is capable of working with 32 bit files with 768kHz signal frequency.
Only USB2 rated cables will work well.
USB cables with ferrite filters (the “thingie” on the cable ) will not work.
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MAC OS operation of USB output:
MAC OS dos not require any driver installation. Somehow miraculously the MAC
computer knows how to handle all USB devices. Microsoft, even 15 years later, still
cant figure out how to do it. They are probably still scratching their heads.
After plugging the DAC by the USB cable and turning it on, within 3 seconds the device
should show up on the MAC.
Note: the device will NOT be described as Lampizator DAC but as JL USB or
LAmpizator USB module.
To verify what is going on, please go to the “apple sign” in top left corner of the screen
and choose PREFERENCES and then the loudspeaker icon - SOUND.
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Above: on that list the Amanero should appear under INTERNAL SPEAKERS.
Next thing to check is MIDI SETTINGS of the MAC computer. We go to the top right corner
of the screen and press SPOTLIGHT (Loupe):
We type in the search line MIDI SETUP and -> enter.
In the MIDI setup we can choose frequencies of sampling we use for the USB output. We
don’t think that the higher the better but your own test should confirm that.
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