Neutral X Series User manual

XSerie Parallel Multi Preamp
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XSerie Parallel Multi Preamp
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NEUTRAL AUDIO would like to thank you for the trust you have placed in us
by purchasing this product and we hope it will satisfy you for a very long time.
We have put every effort into making sure our equipment, which is exclusive
and unique because of our advanced analog technology, PARALLEL MULTI
PREAMPLIFIER is High-End audio industry reference.
Signed J. M. Jimenez

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IMPORTANT SECURITY INSTRUCTIONS
oPlease read all the instructions.
oDon’t use this equipment in humid environments.
oDo not use cleaning fluids. Use a dry or slightly damp cloth.
oDo not install near heat sources or equipment that generates heat.
oExcept for the colour elements used to change the sound scene, there is no
internal component that needs adjustment. Do not manipulate. Contact qualified
service personnel in case of any failure to prevent electric shocks.
oPlace the equipment on a flat surface with enough space for ventilation
oDo not cover the rear ventilation vents.
oBefore connecting the power, be sure that you have the proper voltage and the
earth/ground is of good quality.
oContact Neutral Audio with any question not mentioned in this guide.
oAlways disconnect the amplifier before handling connecting cables.
This product has been hand made in Spain, a member of the European Community.
Neutral Audio and D.R.E.i. technology are trademarks and may not be used without the
owner’s permission.
This NEUTRAL AUDIO electric device is
Certified as having D.R.E.i. system technology
integrated into it.

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INDEX
A brief description of the Preamp,5
Active Control of HC to AV receptor, 10
Buttons HC and LB, 11
Connecting an integrated volume control, 10
Connecting Bass dedicated amplifier, 10
Designed by D.R.E.I. technology, 5
Diagram of Connections, 9
Everything is analog, 6
Front pannel, 11
H or HC active versions, 9
H Version, 6
IMPORTANT SECURITY INSTRUCTIONS, 3
Input and Output L.B., 10
Input lines, 8
Insert batteries, 12
Internal topology, 14
Output to Amplifier, 8
Parallel Multi-Preamp,5
Power on the equipment, 11
S Version, 6
Select the source and the volume, 11
Solidly constructed, 6
Special versions, 6
Switch on the preamp, 7
Switching the HC to, 8
Synergy control, 13
Technical features, 16
The remote control, 12
Use the remote control, 12
Warranty conditions, 15

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A brief description of the Preamp
Firstly, we are proud that NEUTRAL AUDIO is now a part of your highly valued musical
equipment. With this Analogical and Stereophonic Multi-Preamp, we have made a big step
forward in high-end audio.
This new product, essential in any high-level stereo system, is designed to increase the
listening quality of stereo audio and film sound tracks to well above normal levels. The
sound will allow you to enjoy many hours of warm, ear friendly music. If the rest of your
audio equipment is of the appropriate quality, we are convinced that you will get great sound
neutral, transparent, detailed, warm and musical.
A preamplifier is the element in the equipment of musical reproduction that lets you
selects the source you want to hear and change its output level or volume for the associated
amplification. Neutral Audio is aware that this step is where more music signal deteriorates
due to the extremely low levels with which they are working and the electrical problems
inherited with this and because of this the components should be chosen with great care
because the overall outcome of the entire system depends on them.
Neutral Audio has developed this Parallel Multi Pre-amplification technology, which
uses several modules in parallel preamps for each channel controlled by the DREi module
(deIntermodulator & Speaker Optimizer), to eliminate these problems and obtain a pure
sound which will be heard as never before.
This is the only analog preamplifier capable of modifying the sound stage by using some
interchangeable coloured elements supplied as standard.
►Designed with D.R.E.I. technology
PURE SINEWAVE. The insertion of D.R.E.i. module technology (deIntermodulator &
Speaker Optimizer), in all the analog preamps models manufactured by Neutral Audio
makes our products an exceptional pioneering technology.
To use the full power of "humanization" of the sound and the reduction of electronic
interactions that this module can offer, Neutral Audio has had to develop new pre-
amplification circuits and ingenious solutions to adapt them to each other.
For more information please visit our website www.neutralaudio.com
►Parallel Multi-Preamp
When inserting D.R.E.i. technology with parallel multi-preamps, a unique system of the
brand and using up to 6 independent preamps for a stereo signal, each one specializing in
one part of the signal that is sent and managed by DREi.
Do not confuse this product with a multi-channel home cinema systems. This is STEREO
even though it uses a configuration based on multiple channels for both the left and right
channels.

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►Everything is analog
One of the fundamental aspects of the X Series and its exceptional sound is that we do
not use any digital devices in the audio signal and show utmost respect to its content.
Everything has been done using analog technology; there is no digitalization of audio in any
process.
Even the volume control is fully analog, just like us human beings.
►Solidly construction
Being top-level equipment, the construction and design has been done without making
concessions of any kind. We have used modern means to make each of the component
parts, quality components, gold plated printed circuit boards and gold or silver plated
connectors depending on the model, made to measure high performance toroidal
transformers, Premium electronic brands, etc.
The audio signal has a reduced route as it does not run via any internal cables, most of
the route being on a single circuit board.
We have used an anodized aluminum chassis for its sturdiness and durability.
►Special versions
There are two different versions in this series:
“S” Version
For high-level stereo equipment which you do not wish to pre-integrate into a home
cinema system, (although it can be invisibly connected, (See specific section).
“H” Version
For systems in which you wish to fully integrate the preamp with a multi-channel home
theatre system. Add L.B. function (Loop Bass) and HC (DREI Improved tech for main
cinema channels). It is completed with a 12VDC input to auto connect to cinema mode when
your AV receiver is on, (See specific section).

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SWITCH ON THE PREAMP
Rear pannel.
CAUTION.Before making any connections, turn off the associated amplification
and disconnect the mains plug.
Make sure the voltage of the device matches that of your power supply. For safety, the
earthing/grounding of your electrical system must work properly; otherwise you may
introduce unwanted noise and interference into the audio systems.
We strongly recommend that good quality, clean, dry, rust free connecting cables be
used. Periodically check the state of these connections.
The input/output connections, depending
on the model are of very high quality in gold or
silver plated. We recommend the periodic
application of a specific product for contact
cleaning (ask the dealer) to the connectors to
prevent rust and loss of contact.
Balanced input and output connectors are
XLR standard:
Pin 1 = Ground/Earth
Pin 2 = Hot (positive)
Pin 3 = Cold (negative)

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►Input lines
The preamp has non-balanced inputs 1 - 2 - 3 - 4 in line or low level, where you can
connect any audio source like CD players, radios, etc.
You must connect the left channel to the "LEFT" (white) and the right channel to the
"RIGHT" (red).
Input 1 is dual, it can be connected balanced (XLR) or
unbalanced (RCA), but only one of the two works
depending on the position of the switch located in the
centre next to these sockets. Follow the direction of the
arrows, up for RCA, down for XLR.
It is normal for the balanced input signal to be
different than the RCA and this is not a malfunction.
All the inputs are equal but we recommend that the
source you use most frequently be connected to number
2, as by default it is the active input when you turn on the
preamp.
►Output to Amplifier
You should connect the output marked "OUT" directly to the associated amplifier and can
use either unbalanced (RCA) or balanced (XLR) connections as both are always active.
For the advanced dynamics features of the DREi tech system you should not insert any
device between the preamplifier and amplifier. Direct coupling of the output with 12
transistors is used and there is no decoupling capacitors.
Note that when you connect your device there will not be an output signal for a few
seconds until all the internal modules are operational after which the blue power light will
come on. This is not a failure; it protects your speakers from inappropriate signals. The
same happens when you turn off the HC "active" mode.
Please read the following paragraph.
►Switching the HC to “invisible”mode.
All models and versions have "HC", Home Cinema, and invisible sockets as explained
below.
Here you can connect the low level left and right front output channels of your receiver
for AV (audio / video) or home theater.
With the preamp on, this socket has no use, so that does not affect your stereo signal in
any way but when you want to watch a movie or listen to your AV receiver, simply turn off
the preamp, after which it goes into "invisible” mode, the HC input is automatically
connected to the output "OUT" unbalanced (RCA) of the preamplifier, so you can enjoy your
soundtracks through the main amplifier and its main front boxes. Bear in mind that the
balanced output (XLR) will have no signal, (only in HC active mode).
CAUTION. Do not connect this socket to anything that does not have its own volume
control, as this may damage your speakers and your ears. Note that maximum volume
would go to the amplifier.
CAUTION. Never turn off the preamp if you have connected this input to an AV receiver
without first being sure that the output volume of the AV receiver is low or turned off. It may
damage your speakers and your ears.

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Diagram of Connections
►“H” or HC active versions
Everything said above about connecting the HC is also valid for this version and you
must observe the same precautions as in the previous section.
These models have HC "active".
This includes a button on the front marked HC. On pressing the HC input is diverted
(after a few seconds of system protection), to the DREI module and after being processed is
sent to the various preamplifiers before being returned to the output. Thus, all the
improvements to the audio signals that happen with this new system are also applied to the
two main channels of the home cinema, so that the soundtracks and music will be much
more real, more three-dimensionality and spatiality
Note that the preamp volume control will be disabled and the volume of output will be
equal to the input, so that the AV receiver is what controls the volume of the entire system. It
may happen that with certain receptors the output signal is somewhat different in the front
channels than in the rest. We recommend readjusting the output levels of your AV system
after it is connected to this preamp.
In this version ("H") you can use the balanced outputs (XLR) for the amplifier stage.

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►Input and Output L.B.
A very interesting feature added to the “H” version.
In many homes where these devices are usually installed, it happens that the acoustics
are not of the most appropriate and for economic, personal or aesthetic preferences;
acoustic treatment cannot be carried out. So it is best in these cases to carry out an
electronic correction of the room’s acoustic response.
This is mostly done with most digital processors or with equalizers of different types. In
the high-end audio industry there are high quality DRC devices to achieve these goals.
As an example, suppose that a room because of its dimensions and finish has an
increased 100 Hz frequency response, the DRC reduces the sound level as necessary to
level out the total response and reduce unwanted increases. We do not intend to delve into
this type of solution but you must understand this concept in order to properly assess the
role of LB.Ask your dealer about this type of equipment.
L.B. means "Loop Bass" (lower loop). It is known that most of a room’s acoustic
problems happen at low frequencies. So it is better not to process the remaining frequencies
to avoid damaging the complex musical content. Taking advantage of D.R.E.i., when you
press the LB button on the front of the preamp, the low-frequency musical signal is diverted
into LB OUT. From there you should go to a DRC entry or EQ, and once set, they should be
introduced into the preamplifier LB IN connection to be reunited to the rest of the signal that
has not been altered in the least.
When this feature is disabled, the sound is not affected and the LB output has no signal.
►Connecting Bass dedicated amplifier
If you want to bi-amplify your speakers, know how to do it and have the means to do so,
using the function LB. LB provides in its output the part of the signal corresponding to the
bass frequencies, so you can connect an amplifier here just for the bass and the rest of the
output signal to the "OUT" output normal to another stage for the rest of frequencies.
C
►Connecting an integrated volume control.
Perhaps you have a source, such as a CD player which has its own volume control and
do not want it to go through this preamp. You can connect it to the HC input, and as
explained above, you can hear it in the "invisible" or "HC" active modes. Remember that in
this input the volume control of the preamplifier has been disabled.
►Active Control of HC to AV receptor
On the rear of the preamp there are two 3.5"mm. jack type connections so if you have a
home cinema receiver or other device capable of controlling the
on/off of external equipment, (usually used for ignition of the
associated amplifier stages), either of these two output jacks can
be connected to the 12VDC the power amp. This jack accepts
tensions between 5VDC and 24VDC.
That way, when you turn on your AV receiver, the
preamplifier automatically switches to "HC" active mode. It will
return to normal when you turn off your AV receiver.

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FRONT
As you can see the design
of the preamplifier is very
simple, as befits a device of its
category that should be
outstanding for ease of use and
best possible sound.
►Power on the equipment
If you've already got this far, you must have the equipment fully installed, tested and
connected.
It is common sense to avoid damage to your speakers by turning the amplification on last
and also by turning it off first.
When you press "POWER", the display comes on instantly, but there will still be no
sound. After five seconds, when all the internal modules are stabilized, the circular LED
power button will light, indicating that the preamp is fully operational.
It is set to use Input 2, at a volume level of -88db.
►Select the source and the volume
The three central buttons are audio source selection, volume + and volume -
Gently press them to change the input source line 1 to 4 and vary the volume or with the
remote control supplied.
►Buttons HC and LB
If your preamplifier is version "H" it will have buttons marked "HC" and “LB" on the left.
The function of these buttons has been explained above.
If you press "HC", the circular light will light up dimly, the display is switched off and the
power button illumination will dim. It is programmed so that their brightness does not bother
you in the dark when you are viewing movies.
When you press HC again, the preamplifier returns to its normal functioning after a few
seconds without audio signal output while it stabilizes its internal systems.
If you press LB, you should do so firmly unlike the other buttons, to avoid accidentally
pressing it you must press it until the circular light comes on and the buttons stays locked in.
Press it again to release.
The LB function is explained in the preceding paragraph about connections.

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THE REMOTE CONTROL
FRONT BACK DISMOUNTED
►Insert batteries
On the back of the solid aluminum control there are 4 screws. Using a small star tipped
screwdriver carefully remove them, exposing the battery case inside.
Insert two good quality AAA batteries and be sure to use the proper polarity. Close the
lid and carefully screw it back down without over tightening the screws to avoid damaging
the internal threads.
When the remote is not in use for long periods, we recommend that you remove the
batteries.
►Use the remote control
Point the remote at the preamplifier display where the infrared receiver is.
The keys 1, 2, 3 and 4 change the selected source.
To increase the volume press + and to decrease the same press –
MON key is used to change the volume level between the two channels (balance), when
pressed once it will show "L" (Left) on the display, now you can press + or - to increase or
decrease the volume level on the left channel. Repeat if you want to do the same with the
channel "R" (Right). These changes will be void the next time you start your equipment.

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SYNERGY CONTROL
One of the advantages of the technology developed by Neutral Audio is that it allows you
to vary the impulse response on each of the various preamps or buffers that make up each
channel. Thanks to this unique and novel technique the soundstage can be adapted to your
taste with a simple change of coloured elements that are included as standard with this
preamp.
The reason that led Neutral Audio to design this feature is very important. As the room
where music is played alters its overall response and depending on its physical
characteristics and the type of speakers you have in your system, the resulting sound can
be far from ideal. Explaining every situation would take forever and that is not the objective
of this manual but generalizing, equipment + room may deliver a dull confused sound, with
severely out of control and poorly defined basses and a lack of stage “space” and “focus”
resulting in the music sounding "lifeless" and unreal. All this can be vastly improved by using
this device.
To achieve maximum synergy between the room and your system, (especially the
speakers) you can change elements internally marked with colours (green, blue and red).
Standard supplied with red element and is suitable as many installations.
Find an enclosed colour printout, a screwdriver and colour elements available with this
preamp. Read both sides of this sheet before continuing. It contains further instructions and
the outcomes you can expect from these changes. Do not wait for a tone control or
equalizer, as this is a different analog technique which is very effective and does not alter
the musical content.
Our recommendation is not to make any changes when you install the preamp,
wait a few days until you become familiar with the sound and only change if you think
you may be more comfortable with some of the other options.
CAUTION.Follow the instructions exactly but above all DO NOT FORGET TO UNPLUG
THE POWER SUPPLY, IT IS NOT ENOUGH TO JUST SWITCH IT OFF. Otherwise you
may cause electric shock and serious personal injury.
No technical skills are required to do this. Make sure you have good lighting. First locate
the 6 hex head screws located on the top cover 3 on each side. Remove them and slide the
cover a little backwards and upwards to remove it completely.
Two elements can easily be found on the bottom left of the large cover. Remove them by
gently pulling them up and replacing them with the one you want. Do not mix different
colors. When you insert them ensure that no connector pin is left unplugged, (it is almost
impossible to get it wrong), and polarity does not matter. Once done replace the cover and
screw back on without over tightening the screws.

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►Internal topology
As shown in the graph, these special preamps feature unique and original topology that make it
different, let you work dynamically with DREI module and prevent intermodulation in the audio
signal.
Get a strong dynamic contribution and absolute control of all frequencies thanks to its 12 output
transistors operating in parallel, and 5 power supplies. An atypical circuitry to obtain a unique and
incomparable sound.

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Warranty conditions
oNEUTRAL AUDIO guarantees this product for a period of 2 years or the time legally
prevailing in the country where it was purchased, as long as it has been supplied by an
authorized dealer.
oThis warranty covers all manufacturing defects.
oTo qualify for this warranty, you must go to a service centre authorized by NEUTRAL
AUDIO or the store where you purchased it, showing your purchase invoice.
The warranty DOES NOT COVER:
oDamage caused by accident, misuse or abuse.
oDamage caused by external factors or Acts of God.
oTheft or robbery.
oDamage caused by handling by persons not authorized to do so by NEUTRAL AUDIO.
oDamage caused by other non-product components.
oProducts purchased from unauthorized distributors.
oShipment of equipment to and from the customer.
oAny costs arising from the installation or uninstallation of the product.
Any handling of the product by persons not authorized by of NEUTRAL AUDIO will
automatically void the warranty.
Consult your service provider for the nearest technical assistance and how to contact them.

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Technical features
All the technical specifications contained in this manual are correct at the time of
printing. However NEUTRAL AUDIO may have made modifications to them without
notice.
Line inputs 1 balanced / unbalanced + 3 unbalanced + 1 H.C.
Outputs 1 balanced XLR and 1 unbalanced RCA
Input and Output Bass Loop (0-315Hz.) Version H
Frequency response 0-100 KHz (extended up to 500 KHz)
Total Distortion 0.04% 1 KHz Sine
Recommended maximum input 7 Vrms
Maximum output 4 Vrms
Input impedance 50 Kohms balanced / 20 Kohm unbalanced
Maximum gain x4 with input of 1 Vrms
Output Impedance 300 Ohms balanced / unbalanced 600 ohms
Remote control
Volume control resistive 100 steps
Balance control
Signal to noise ratio better than 100 dB
Channel separation better than 100 dB
Input / Bridge for 5-24VDC Trigger (H version)
IEC socket
Maximum power (depending on options) 80 W
Supply voltage 230 VAC 50Hz.
Dimensions Width: 450 mm, Depth: 370 mm, Height: 115 mm
Approximate net weight (depending on options) 14 kg
For more information contact your local distributor or Neutral Audio.
►Notes for technical folk:
This device challenges the traditional methods of electronic sound measurement. If
you want to correctly interpret their values, consider talking to Neutral Audio about it.

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NOTES:

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