HEDD 20 MK2 User manual

© 2021 HEDD Audio GmbH | Heinz Electrodynamic Designs | www.hedd.audio
OPERATION MANUAL
HEDD Type 20 MK2 HEDD Type 30 MK2
Heinz Electrodynamic Designs
last updated: 2021-04-06

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Table of Contents
Product Overview
Box Contents
Getting Started
Status LED
Speaker Setup
CoP: Closed or Ported
HEDD Lineariser®
Control Settings
Safety Instructions
Warranty
Troubleshooting
Technical Specications
3
5
6
6
7
11
12
13
17
19
20
22

© 2021 HEDD Audio GmbH | Heinz Electrodynamic Designs | www.hedd.audio
Product Overview
Congratulations on purchasing the HEDD Type 20 MK2 or HEDD Type 30 MK2. You have
acquired very precise monitors with a rich feature set. The main features are exchangable
use as a Closed or Ported system, as well as the integration of the on-board HEDD
Lineariser®. Please head to the specic section to nd out more.
As active speakers, the MK2 monitors have an integrated amplier. You can connect them
with a digital interface or analog pre-amplier. Please refer to the section Getting Started
or Speaker Setup to nd out more.
Due to their similar nature, this operation manual equally covers the HEDD Type 20 MK2
and HEDD Type 30 MK2 monitors. This manual uses illustrations of the dierent variants,
which thus might not match your exact version in terms of colour or size.
HEDD Air Motion Transformer (AMT)
used for higher frequencies
Front View
HEDD Honeycomb Woofer
used for lower frequencies
size 4’’ and 7’’
Front-facing Bass Reex Port
can be used ported or closed with included plugs
please refer to section Closed or Ported
Status LED
please refer to section Status LED to correctly read the signal

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VOL. [dB] LINE RISER®CoP
-2
-4 +4
+2
0
LOW
-2
-4 +4
+2
0
HIGH
EXTEND.
(less SPL)
NORMAL
for SUB (80 Hz)
MONO LEFT
ANALOG
RIGHT
-4 +4
0
-10
SMALLLARGE
OFF
MED.
-6
-12 +12
+6
0 ON
OFF
(*)
Ported
Closed
SHELVING FILTER[dB] LF R NGE
N LOG/ ES INP. SENS. [dB] DESK FILTER
ALL "0" and "↑" POSITION = FACTORYSETTING
!
RISK OF
ELECTRIC SHOCK
DO NOT OPEN
This loudspeaker is capable of deliveringsound
pressure levels in escess of 85 dB(A),which may
cause permanent hearing damage.
Do not expose this appliance to moisture orrain.
Referto qualied personnel for servicing.
CAUTION
M DE IN GERM NY - www.hedd.audio
TYPE 20 MK2-R
I
O
ANALOG IN AES IN AES THROUGH
1
3
2
PUSH
1
3
2
PUSH
85V - 264V 50Hz/60Hz
factory
use only
MK2 Control Board
used for adjusting the various settings
please see section Control Settings
Rear View
In- & Output Connections
XLR analog & AES digital input
AES passthrough
Power Switch
integrated universal mains, compatible with 85V - 264V at 50/60 Hz
appropriate power cable supplied

© 2021 HEDD Audio GmbH | Heinz Electrodynamic Designs | www.hedd.audio
Box Contents
The complete set includes:
• one active monitor Type 20 MK2 or Type 30 MK2
• one power cable compatible with the region from where it was sold
• quickstart guide
• «CoP» leaet explaining the proper switch from Ported to Closed Mode
• «CoP» screw and plugs to seal the bass reex ports
Please make sure your box contents match our listing.
QUICKSTART
MK2 Professional Studio Monitors
How to switch between Closed and Ported

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Getting Started
Make sure the main power switch is in the "0" position, then connect the power cord to the
power socket.
Set the power switch to "1". Please note that the LED becomes green immediately but it
may take up to 15 sec to power up and play music. Warning: High volume may damage your
hearing! Consider lowering the volume rst.
Connect your audio source via the balanced XLR socket, then select the desired input with
the ANALOG / AES rotary switch on the back plate (bottom left). For digital AES input,
please choose the signal (left, right, mono).
As there are quite a number of control knobs on the backplate we recommend to start
playing music with all the markers in the "Up" position:
ALL "0" and "↑" POSITION = FACTORY SETTING
Status LED
The front LED panel of the speaker will indicate its operational status as follows:
The monitors automatically jump into stand-by after 30 minutes. They wake back up when
audio is played.
Green Light
power on
Red Light
overload: please decrease the input sensitivity
White Light
stand-by

© 2021 HEDD Audio GmbH | Heinz Electrodynamic Designs | www.hedd.audio
Speaker Setup
To achieve the best possible sound and unfold the full potential of the HEDD MK2
monitors, the correct speaker placement is very important. Please follow our guide below.
Horizontal Setup
Placing the speaker horizontally is the best way, as they are designed to be placed like this.
Always place them on a solid surface or a stand.
Vertical Setup
If you like to place the speaker vertically in a stereo or surround setup, make sure that they
are aligned symmetrically: The Tweeters both should face either outwards or inwards.
Otherwise, the acoustical image will not be correct.
Height Positioning
Place the speaker in a position so that the tweeter matches the height of your ears when
you are on your listening position. If this is not possible, tilt the speaker so that the tweeter
aims at your ears. Try to avoid that the tweeter is placed too low or too high, as this may
result in a mued or less dened sound.

-8-
Stereo Positioning
For optimizing the stereo listening position, place the two speakers so that they form an
equilateral triangle with your listening position. Your listening position should be on an
imaginary center point between the two speakers. Adjust the distance of the speakers and
the distance of our listening position accordingly to nd the best position. Listen to some
good known records while adjusting, until you get an authentic stereo panorama.
Surround Positioning
For a surround listening setup, place the speakers in a circle around your listening position
in following angles: Center 0°, Front Right 30°, Rear Right 110°, Rear Left 250° and Front
Left 330°. Radius of the circle should be between 0.7m - 2m. Surrounding walls should be
at least 40cm away from every speaker to avoid early reections. It is preferrable to use
the same type of speaker for every channel (except the subwoofer, of course), because
otherwise negative frequency and/or phase coloration can occur. Refer to the ITU
recommendation BS.2159-4 for a detailed explanation.

© 2021 HEDD Audio GmbH | Heinz Electrodynamic Designs | www.hedd.audio
«CoP» Closed or Ported
The HEDD Type 20 MK2 and Type 30 MK2 can be used in either closed or in ported
mode. These are two fundamentally dierent systems that are available for the user to
compare and choose. There is no denite better between the two systems. We
recommend to compare carefully to nd the optimal option for your environment and
listening habits.
Switching Between Closed and Ported
By default, the HEDD speakers are "ported." This means that the bass port is open. To
switch to "closed" mode, please follow the steps below.
1. Insert the included HEDD plugs with help of the HEDD screw to close the ports.
Make sure that the screw is facing outwards!
Push the plugs deep into the bass ports. Make sure that you
can still reach the screw comfortable with your ngers to
pull it out. The plug should not go deeper than when the
bass port starts to bend and the resistance increases. Once
inserted, feel free to unwind and remove the screw.
2. Switch the knob on the backpanel of your monitors to Closed mode.
Please note that the headroom in Closed Mode is limited compared to Ported Mode.
We highly recommend to lower the volume before switching.
from Closed to Ported
To switch back to Ported Mode, stop the audio
playback, wind the screw back into the plug, gently
pull the plug back out again and change the rotary
switch on the backpanel to Ported.
!
!

- 10 -

© 2021 HEDD Audio GmbH | Heinz Electrodynamic Designs | www.hedd.audio
Ported Mode
This is the default operating mode. The bass reex ports are open and allow for a powerful
low-end reproduction. This operation mode allows for a higher eciency and while
maintaining access to lower bass regions.
Closed Mode
In closed mode the HEDD MK2 speaker functions as an innite bae speaker. This results
in a cleaner sound and increased resolution. However, a 6-10 dB reduction in maximum
sound pressure level (depending on the audio material) for low frequencies is the
consequence.
CoP
Ported
Closed
CoP
Ported
Closed

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HEDD Lineariser®
Due to the physically given relationship between time and frequency, expressed in the
groundtaking harmonic analysis or Fourier transform, dierent tones have slightly
dierent travelling times through loudspeakers. This is true for both active or passive
speakers. Broadly speaking, lower frequencies need more time to pass through than
midrange frequencies, and these are slower than the high tones.
Our HEDD Lineariser® oers a complex phase-correction of your HEDD MK2
monitors. It solves one of the most challenging problems in loudspeaker designs, e.g.
the natural occurance of phase dierence during multi-component sound reproduction.
With the on-board Lineariser®, our monitors are always “right in time”.
The phase-linearisation will improve transients and imaging. To be noted: the correction
necessarily will introduce a latency of around 15 ms. To avoid the delay that might aect
live recordings or instrument playing the HEDD Lineariser® can be switched o.

© 2021 HEDD Audio GmbH | Heinz Electrodynamic Designs | www.hedd.audio
Control Settings
Volume
The output volume rotary switch changes the reproduction level in a ± 12 dB range. We
recommend to ne-tune the volume through the connected source like an interface,
control board, mixing board or pre-amp.
The output volume allows to match the speakers to the audio chain, e.g. lowering SNR or
THD. The default setting is 0 dB.
VOL. [dB] LINE RISER®CoP
-2
-4 +4
+2
0
LOW
-2
-4 +4
+2
0
HIGH
EXTEND.
(less SPL)
NORMAL
for SUB (80 Hz)
MONO LEFT
ANALOG
RIGHT
-4 +4
0
-10
SMALLLARGE
OFF
MED.
-6
-12 +12
+6
0 ON
OFF
(*)
Ported
Closed
SHELVING FILTER [dB] LF R NGE
N LOG/ ES INP. SENS. [dB] DESK FILTER
ALL "0" and "↑" POSITION = FACTORY SETTING
When viewing in PDF, please click the corresponding switch to jump to the appropriate section.

- 14 -
HEDD Lineariser®
By default, the Lineariser rotary switch is turned on. This activates an on-board phase-
correction of our HEDD MK2 monitors.
For more information, please refer to the section HEDD Lineariser®.
Closed or Ported
CoP switches the internal system layout according to the selected option. Please make
sure that the plugs are correctly inserted for closed mode.
For more information, please refer to the section Closed or Ported.
Shelving Filter
Low Shelf: Frequencies between 30 Hz and ~200Hz are increased or reduced in a ±4 dB
range in steps of 1 dB. If you have placed your speaker near to a wall or in a corner, you
will typically get a boosted bass response. You can use this control for compensating. Or
if you place the speaker in a particularly bright room, use the control to get a more
balanced sound.
High Shelf: Frequencies between 3 kHz and ~20kHz are increased or reduced in a ±4 dB
range in steps of 1 dB.

© 2021 HEDD Audio GmbH | Heinz Electrodynamic Designs | www.hedd.audio
Low Frequency Range
The default low frequency range may be adjusted according to specic needs. When set
to extended, the low frequency response is extended by ~20 %. In the case of Type 20
and 30 MK2 the -3dB point goes from 32 Hz down to 26 Hz.
In case the monitors are used in a Satellite-Subwoofer system together with our BASS
series, the switch has to be set to “for SUB”.
In case the monitors are used in a Satellite-Sub-system together with our BASS series,
please use the analog output to the satellites of the BASS 08 or 12 unit to get a
completely linear phase Satellite-Sub-system. In case you feed the full range signal to
both the satellites in parallel to any subwoofer (HEDD or other) set the switch to “for
SUB”.
If you choose the extended bass response, the woofer has to deliver much
higher amplitudes if very low frequencies occur. As a consequence its
maximum sound pressure level (SPLmax) is reduced for low frequencies
by 6-10 dB depending on the musical material. The mechanical overload of
the woofers is looming much earlier.
If a BASS 08 or bigger HEDD subwoofer is used, it is preferrable to use
the analogue outputs from the sub. The HEDD BASS subwoofers have a
Lineariser® on board as well, therefore the overall bass signal is delayed
by approximately 30 ms. They are added to the analog output so that an
all in all linear phase Satellite-Sub-system is in place. In this very case you
may set the switch to “for SUB”.
Should the listening distance vary between subwoofer and MK2 monitor
with respect to the listening position, you may compensate on that with
the “Sat. oset” rotary switch by 2m in .5m steps.

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Input Selection
This 4-position rotary switch selects which signal to reproduce.
“Analog” takes an analog signal from a symmetrical source.
The other 3 positions refer to an incoming digital AES signal. Left,
Right or Mono can be extracted from the data.
For multi-channel audio that exceeds
stereo, for example 5.1 surround sound,
the monitors have to be fed through
the analog XLR input.
Input Sensitivity
The “Input Sensitivity” rotary switch levels the voltage of the analog input. It can be used
to optimize the signal to noise ratio for the A/D converter. In case of weak input signals
the gain can be added for up to +4 dB. In case of very loud signals (>2 V) either -4 or -10
dB gain reduction can be applied to avoid an A/D converter overload.
The setting has no eect when the signal is received through the digital AES input.
Desk Filter
Monitors sitting on meter bridges or desks may suer by early reections from the desk
surface that potentially blur the sound. The “Desk Filter” is a 3-position PEQ (Parametric
Equaliser) that minimizes the eect. Please note that we cannot give an exact
recommendation because the acoustical environments play a vital role. Please nd out
in how far these lters may improve the sound.
N LOG/ ES INP. SENS. [dB] DESK FILTER
MONO LEFT
ANALOG
RIGHT
ANALOG IN AES IN AES THROUGH
1
3
2
PUSH
1
3
2
PUSH
Small up to 80 x 150 cm [d x w]
Med. up to 100 x 180 cm [d x w]
Large for larger consoles or desktops

© 2021 HEDD Audio GmbH | Heinz Electrodynamic Designs | www.hedd.audio
Safety Instructions
Please read the following safety instructions carefully before setting up your system. Keep the
instructions for subsequent reference. Please read the warnings and follow the instructions.
• To reduce the risk of an electric shock, do not open the loudspeaker yourself. Always refer to
qualied service personnel.
• This is an active loudspeaker. It must be connected with an IEC 60320 AC mains power cord
like the one supplied with the product.
• Please switch o your audio system before connecting or disconnecting any cables to the
speaker – also if you intent to clean the surface or single components. Never use ammable
or combustible chemicals for cleaning audio components.
• HEDD studio monitors are equipped with universal mains, meaning that the speakers work
within a voltage range from 85–265V. This makes the usual voltage switches unnecessary.
• Do not place this unit on an unstable cart, stand or tripod, bracket or table. The unit may fall,
causing serious injury and/or serious damage.
• This product should never be used outside. Avoid exposing it to rain or any sort of moisture.
• Power chords and audio cables connected to this product should never be stepped on.
• Please note that defective cables can harm your speakers and / or create humming, crackling,
etc.
• Always keep electric equipment out of the reach of children.
• Always unplug sensitive electronic equipment during lightning storms.
• The monitor should be installed near the socket outlet and disconnection of the device should
be easily accessible.
• To completely disconnect the speaker from the AC mains, physically disconnect the power
chord.
• Please try to avoid touching the speaker diaphragms. Always keep the woofer’s ventilation
ports open.
• Don't use the speaker at very high or low temperatures. The speakers’ back panel should not
be exposed to direct sunlight. Never operate this product in an explosive atmosphere.
• High SPL’s can irreparably damage your ears! Please take good care when working the
speakers at high levels.
• Loudspeaker diaphragms are embedded in strong magnetic elds. Magnetic objects (toys
etc.) should not be placed or played around with next to the speakers.
• Make sure that the air can circulate behind the speaker as it needs sucient cooling.
• Only mount this product onto dry and non-conducting walls (wood, plaster). For other wall
materials an additional isolation panel is required. To prevent injury, this loudspeaker must be
securely attached to the wall in accordance with the installation instructions of your wall
mount bracket.

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Maintenance and Care
• Your HEDD audio studio monitor doesn’t need any internal maintenance like
lubricating, mechanical adjusting and so on, so there is no reason to open up the
speaker cabinet. If servicing will be necessary, refer to qualied service personnel.
• For cleaning the surface of the cabinet, we recommend to use a microber cloth
and simply warm water. Don’t use any aggressive detergent, as it will damage the
nish.
• For cleaning dust out of the loudspeaker diaphragms, use a very soft brush.
• Always switch the speaker o before cleaning!
• Make sure that no liquids get inside the cabinet.
• Don’t use ammable or acidic chemicals for cleaning.
Shipping and Packaging
If you need to send your speakers postal, use the original packaging. It’s the safest way
to get your speakers from A to B.
HEDD Audio GmbH cannot be held responsible for any damage due to improper
packaging.
Environmental Information
All our products comply with RoHS and WEEE.
If your speaker is seriously broken, please consult your local authorities for further
information on proper disposal.

© 2021 HEDD Audio GmbH | Heinz Electrodynamic Designs | www.hedd.audio
Warranty
We promise that our products are free of defects in material and workmanship for the
duration of twenty-four (24) months from the date of the original purchase. This
warranty can be extended to thirty-six (36) months if the product is registered with us
within the rst 6 months after purchase: hedd.link/registration
Accessories and any parts that are subject to wear and tear are covered for six (6)
months.
The latest updates to our warranty will be accessible online at hedd.audio/warranty/
Please always contact your point of sale rst: Please check our list of authorized
resellers: https://hedd.audio/store-locator/
Limitations
Please note that inappropriate use voids the warranty and any claims.

- 20 -
Trouble Shooting
If none of these advices solves the problem, the speaker might be faulty. If you need
further assistance, please contact us directly: [email protected]
Problem Solution
Green Power-LED is “on” but there
is no audio output
1. Check the wiring and make sure that all cables are
connected correctly.
2. Check if you have selected the correct input via the
ANALOG/AES switch on the back panel of the speaker.
3. Check the signal path. Swap the cables of both loud-
speakers. You might have one defective signal cable.
4. Connect an audio source directly to the speaker (pay
attention to the volume!). If you now have audio output, the
malfunction is in your signal path.
5. If the back panel of the speaker is very hot, it may be that
the internal thermal protection of the ampliers has shut down
the audio output to prevent electrical damage. Turn the unit
o, let it cool down and repower.
There is a hum or buzz noise in the
output
1. Disconnect all signal cables. If the noise is gone, check your
audio cables and the equipment of your signal path. If you are
using the balanced XLR input, try to activate Ground Lift on
your signal source.
2. If there is still noise, check if you have any other electrical
devices that potentially produce high amounts of RFI
(cellphones, switching power supplies, radio equipment) next to
your speakers. If so, move them further away.
Red Overload-LED lights up
constantly
Reduce the input audio level either on the source or with the
GAIN control on the back panel of the speaker
Speakers vary in output volume Use the GAIN control to compensate for any level dierences