Manual
Dual Channel
Microphone,
Line &
Instrument
Preamplifier
PADPHANTOM
-20
48V
Off
PHASE
Rev.
Nor.
Gain
24
22
21
20
19
18
17
16
15
14
Clip Limit
48 V
Off
HI PASS
50
Off
27
29
dB
Hz
32
66
35
38
54
60
41
44
49
n
u
o
S
20
%
SOURCE INSERTINSTR.
Instr.
Line
o
r
m
f
r
a
e
n
P
c
d
3
5
1
0
7
10
3
70
100
50
30
0
VU
1
LIMITER0VU CAL
dBdBdB
-10
18
Off
AD OVL
12
e
L
a
b
FLAIR
TUBE AMP
5
dB
High
18
Off
6
Med
12
Output
-9
-8
-10
-6
-12
-5
-14
-16
-18
On
-20
-22
OffMic
-24
5.5
-25
-26
6
dB
Gold
Mike
Mark 2
-2.5
0
2
3.5
5
PADPHANTOM
-20
48V
Off
PHASE
Rev.
Nor.
Gain
24
22
21
20
19
18
17
16
15
14
Clip Limit
48 V
Off
HI PASS
50
Off
27
29
dB
Hz
32
66
35
38
54
60
41
44
49
n
u
o
S
20
%
SOURCE INSERTINSTR.
Instr.
Line
o
r
m
f
r
a
e
n
P
c
d
3
5
1
0
7
10
3
70
100
50
30
0
VU
2
LIMITER0VU CAL
dBdBdB
-10
18
Discrete
Off
AD OVL
12
e
L
a
b
5
-16
-18
On
-20
-22
OffMic
-24
Class A
FLAIR
TUBE AMP
Preamplifier
dB
High
18
Stage
Off
6
Med
12
Output
-9
-8
-10
-6
-12
-5
-14
-2.5
5.5
-25
-26
6
dB
Model
2485
Power
0
2
3.5
5
GoldMike Mk 2
Model 2485
Dual-channel microphone and instrument preamplifier
Manual GoldMike MK2
Version 2.0 – 11/2004
Designer: Ruben Tilgner
This user's guide contains a description of the product. It in
no way represents a guarantee of particular characteristics
or results of use. The information in this document has been
carefully compiled and verified and, unless otherwise stated
or agreed upon, correctly describes the product at the time of
packaging with this document.
Sound Performance Lab (SPL) continuously strives to improve
its products and reserves the right to modify the product
described in this manual at any time without prior notice. This
document is the property of SPL and may not be copied or reproduced in any manner, in par t or fully, without prior authorization
by SPL.
SPL electronics GmbH
Sohlweg 55, 41372 Niederkruechten
Germany
Model 2485
Tel. +49 (0 )2163 983 40
Fax +49 (0)2163 983 420
Email: info@soundperformancelab.com
www.soundperformancelab.com
SPL USA: www.spl-usa.com/info@spl-usa.com
© 2004 SPL electronics GmbH. All r ights reserved. Names of other companies
and their products are trademarks of their respective owners.
2
GoldMike MK2
Introduction ................................................................... 4
Before You Begin ............................................................ 5
Rear Panel/Connections ................................................. 6
Wiring ......................................................................... 6
General advices ........................................................... 7
Mic Input 1/2, Line In 1/2, Inserts 1/2 ........................... 8
Outputs 1/2, GND Lift .................................................. 9
Front Panel/Connections ............................................... 9
Instr. Input 1/2 ............................................................. 9
Control Elements ............................................................ 10
Power, Gain, About Gain Adjustments .......................... 10
Output, Phantom ........................................................ 11
Phase, Pad, Hi Pass .................................................... 12
Flair, Tube Amp, About Tube Amping ............................ 13
Limiter ........................................................................ 15
VU-Cal, Source, Display, VU-Meter ............................... 16
48 V LED, Clip LED, Limit LED, AD OVL LED .................... 17
Tec hno log y .................................................................... 18
Solid State and Tube Stages, Output Stages ................ 18
Instrument Input, Relays, Foil Condensers ................... 19
Contents
Power Supply ................................................................. 20
Options (A/D Converter and Lundahl Transformers) ........ 21
Specifications/Dimensions & Weight ............................ 23
Warranty ......................................................................... 24
Notes ............................................................................. 25
GoldMike MK2
3
Introduction
The GoldMikeMK2 is the result of all our experience and
knowledge from its successful predecessor and represents an
improved, more flexible and, more modern version.
We have adde d technologies that have already proven to provide
superior tonal results in other SPL products. For example,
the instrument input is designed around a class A impedance
converter which premiered in the SPL GainStation.
A signif icant contribution to the success of the predecessor was
the hybrid preamplifier concept. It combines transistor and tube
preamplifier stages and specifically utilizes their technological
and sonic advantages: The efficiency and low noise of a discrete
transistor stage is enriched with musical coloration of a tube
stage.
The transistor stage is composed of single transistors in a class
A design. The circuitry is fully discrete, and each transistor is
completely optimized for its specific task. You will not find any
IC’s in this preamplifier stage because they cannot be optimized
for this specific application to the degree we at SPL aim for. This
all new discrete class A transistor stage is a genuine innovation
in the entire preamplifier market at this price level.
The degree of tube pre-amplification is no longer the fixed + 6
dB value of its predecessor. The GoldMikeMK2 sports the selection of three different tube pre-amplifications: +6 dB remains
the standard complemented by +12 dB and +18 dB. This allows
creative variety with the tube saturation and limiting effects.
We have also added an extra sett ing to the popular Flair circuitr y
to give more flexibility to the presence improvement.
Because the GoldMikeMK2 is a dual channel preamplifier,
its channel separation is of fundamental importance for the
stereo image. Therefore the print-board layout is symmetrically
mirrored around the power supply in the center from channel 1 to
channel 2. This results in an identical signal flow to supporting
a naturally balanced stereo image. Additionally the print-board
provides extra-large ground areas maximizing the shielding
against crosstalk and interference.
4
GoldMike MK2
Before You Begin
IMPORTANT: Before you operate your GoldM ike MK2, firs t check
carefully whether the local voltage setting corresponds to the
switch setting on the rear panel!
If not, and the voltage is in one way or another, incorrect, you
will either experience an immediate fuse burn through (if the
setting is lower than the supplied power) or, if the power is
110-120 V at a 220-240 V input switch setting, the GoldMike MK2
will simply not function correctly.
Moreover, make sure you remove the power plug from your
GoldMike MK2 before changing this switch setting!
Always turn volume down or mute your speakers when
connecting or repatching audio cables to avoid damage to your
speakers and ears.
It makes good sense to think about where you place your MTC
before connecting it. It should be positioned so that you can
easily reach it, but there are other considerations. Try not to
place it near heat sources or in direct sunlight, and avoid exposure to excessive vibrations, dust, heat, cold or moisture. It
should also be kept away from transformers, motors, power
amplifiers and digital processors. In addition, please:
220 – 240 V~50 Hz
110 – 120 V~60 Hz
VOLTAGE
VOLTAGE
• Do not open the case. You may risk very dangerous electric
shock and damage to your equipment.
• Leave repairs and maintenance to a qualified service technician. Should foreign objects fall inside the case, contact your
authorized dealer or support person.
• To avoid electric shock or fire hazards, do not expose your unit
to rain or moisture.
• In case of lightning, unplug the unit. Always unplug the cable
by pulling on the plug only; never pull on the cable.
• Never force a switch or knob.
• Use a soft, lint-free cloth to clean the case, if necessary
together with an acid-free cleaning oil. Avoid cleaning agents
as they may damage the unit.
GoldMike MK2
5
Rear Panel/Connections
MIC INPUT 1
Wiring
HD recorder etc.
S/P-DIF signal to DAW,
Optional A/D converter, model 2376
S/P-DIF signal
for external synchronization
XLR Wiring:
TRS Jack Wiring:
Mono Jack Wiring:
Tip = (+), Ring = (–), Sleeve = GND
Pin 1 = GND, Pin 2 = (+), Pin3 = (–)
Made in
OPTICAL
DIGITAL OUTPUTSSYNC INPUT
SYNC
LOCK
SPDIF SPDIF
x2
44,1
SAMPLE RATE
Model
24/96 AD
Converter
630 mA slow
315 mA slow
110 – 120 V~60 Hz:
220 – 240 V~50 Hz:
4860000
GoldMike 2
SPL electronics GmbH
Niederkrüchten, Germany
www.soundperformancelab.com
Tip = (+), Sleeve = GND
LINE IN 1
Mono Jack:
Unbal. 0dB
INSERT 1
Taiwan
TRS Jacks: Balanced +4dB
Use Mono Jacks for Unbal. Operation
OUTPUTS 1
INPUT OUTPUT OUTPUT
48
XLR &TRS Jack: Balanced +4dB
Use Mono Jacks for Unbal. Operation
2376
GND LIFT
FUSE RATING
WARNING
NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
TO REDUCE RISK OF FIRE OR ELECTRIC SHOCK DO
VOLTAGE
220 – 240 V~50 Hz
OUTPUTS 2
Use Mono Jacks for Unbal. Operation
XLR &TRS Jack: Balanced +4dB
SERIAL NUMBER
INSERT 2
TRS Jacks: Balanced +4dB
Use Mono Jacks for Unbal. Operation
Sound Performance Lab
LINE IN 2
Mono Jack:
Unbal. 0dB
MIC INPUT 2
MADE IN GERMANY
SEND
RETURN
DISCONNECT MAINS BEFORE REMOVING COVER.
110 – 120 V~60 Hz
RETURNSEND
MIC INPUT 1
LINE IN 1
MicrophoneLine signals*Converter, recorder, consoleEffects (EQs etc.)
Pin wiring
of TRS connectors
INSERT 1
Tip=hot(+), Ring=cold(-), Sleeve=Ground
OUTPUTS 1
GND LIFT
GND LIFT
DO NOT OPEN
CAUTION
RISK OF ELECTRIC SHOCK
THIS EQUIPMENT MUST BE EARTHED.
AVIS: RISQUE DE CHOC ÉLECTRIQUE - NE PAS OUVRIR
XLR outputs
Pin wiring of
1=Ground, 2=hot(+), 3=cold(-)
2
3
1
OUTPUTS 2 VOLTAGE
INSERT 2
Pin wiring of
PUSH
XLR mic inputs
1=Ground, 2=hot(+), 3=cold(-)
1
3
2
* For signals with impedances lower than 1kOhms, i. e. D/A converters, synths, samplers.
Instruments with impedances above 1kOhms are to be connected to the instrument input on the front (see input descriptions on pages 8 and 9).
LINE IN 2
MIC INPUT 2
6
GoldMike MK2
General Advices
Again, while the GoldMike MK2’s housing is EMV-proof and
protects against HF-interference, placement of the unit is very
important since it amplif ies microphone signals as well as other
unwanted signals. Before connecting the GoldMike MK2 or any
other equipment turn off all power.
IMPORTANT: Adjust the voltage setting on the back so that it
corresponds with the power conditions.
The following graph shows the correct wiring for connecting
unbalanced signals to the balanced XLR connectors:
Rear Panel/Connections
Output
220 – 240 V~50 Hz
110 – 120 V~60 Hz
VOLTAGE
VOLTAGE
balanced
1
2
3
unbalanced
1
2
3
1=GND
2=cold (+)
3=hot (-)
The Line Input connector is designed for unbalanced signals
only.
The TRS output connectors (see “Outputs“ on page 9) can be
operated both with balanced and unbalanced wiring. Simply
use a mono 1/4" plug for unbalanced operation.
GoldMike MK2
7
Rear Panel/Connections
MIC INPUT 1
Mono Jack:
Unbal. 0dB
LINE IN 1
MIC INPUT 1
Mic Input 1/2
Dynamic, condenser or tube microphones can be connected to
the Mic inputs. The 48 V switch provides the phantom power
necessary for some microphones (see also „Control Elements/
Phantom“ on page 11).
Alternatively the GoldMike MK2 can be equipped with optionally available transformer inputs from Lundahl (see “Lundahl
Transformer s“ on page 22).
LINE IN 1
Line In 1/2
The unbalanced Line Inputs are dedicated to high-impedance,
high-level signals such as A/D converters, synthesizers or
samplers with an impedance of less than 1 kOhm. Signals
with an impedance of above 1 kOhm, e. g. instruments like E
bass, acoustic guitars with pickups or Fender Rhodes must be
connected to the Instrument Input on the front panel.
The max. input level of the Line Inputs is +23 dB.
IMPORTANT: The Line Input is deactivated as long as an instrument is plugged into Instrument Input jack on the front. We
recommend connecting the Line Input to a patchbay if sources
need to be changed regularly.
INSERT 1
TRS Jacks: Balanced +4dB
Use Mono Jacks for Unbal. Operation
RETURN
SEND
INSERT 1
Inserts 1/2
The balanced TRS Insert connectors (Send and Return) are
used to integrate further units (EQs, Compressors, Limiters,
Effects ...) into the signal path of the GoldMike MK2. The Send
connector is placed behind the tube stage and can also be
used as direct out (without output level control). The Return
connector is located in front of Limiter and Output control which
allows to control the output level, e. g. for precise drive level of
following A/D converters.
8
GoldMike MK2
Rear Panel/Connections
Outputs 1/2
The preamplifier signals are fed to thes e electronically balance d
outputs. Alternatively the GoldMike MK2 can be equipped with
optionally available transformer outputs from Lundahl (see
“Lundahl Transformers” on page 22).
Since the XLR and 1/4 inch TRS connectors are wired in parallel,
an unbalanced connection at one connector will cause unbalanced operation in its parallel connector, e.g. if a mono 1/4 inch
plug is inserted into the 1/4 inch jack, the corresponding XLR
socket will also operate unbalanced.
GND Lift
The GND Lift switch separates internal ground from chassis
ground. The switch can be activated to eliminate ground loop
humming which may occur if the GoldMike MK2 is connected to
units with a different ground potential.
The switch should normally be in the GND position to maintain
the shielding effect of the metal housing for internal GoldMike
MK2 electronics.
OUTPUTS 1
OUTPUTS 1
GND LIFT
GND LIFT
XLR &TRS Jack: Balanced +4dB
Use Mono Jacks for Unbal. Operation
GND LIFT
Front Panel/Connections
Instr. Input 1/2
The Instrument input jack is placed on the front panel for easy
access. It should be used to connect instruments like E-bass,
electric guitars, acoustic guitars with pick-ups etc.
The Instrument input features a 1 MOhm (one mega Ohm) input
impedance.
IMPORTANT: As long as an instrument is plugged into front
Instrument input, the rear panel Line Input is deactivated.
GoldMike MK2
INSTR.
9
Control Elements
Power
21
20
19
18
17
16
15
Power
You guessed that: with the Power switch the GoldMike MK2
is activated, verified by the illuminating switch. Please read
“Before You Begin” on page 5 before throwing in for the first
time.
Gain
27
24
29
22
32
35
38
41
44
49
54
60
14
66
dB
Gain
The Gain control determines the pre-amplification of the microphone signal. The pre-amplification values cover a range from
+14dB up to + 67dB.
IMPORTANT: If Lundahl input transformers are fitted the scale
values are to be increased by up to +14dB (depending upon
microphone in use).
About Gain Adjustments
Amplifying a signal to line level should principally be done solely
with the Gain control. The Output level control is used to adjust
the proper drive level for subsequent equipment.
The VU Cal switch should be set to 0dB (Note: The VU displays
the pre-amplification, not the output level).
10
Now turn up the Gain control until the VU shows values between
0dB and +3dB. There is still enough headroom to prevent clipping at varying input levels. Note that the VUs show average
levels instead of peak levels (which can be up to 10 dB higher).
Thus, in recording high-level signals such as snare and kick etc.
it may be necessary to engage the Pad switch.
You can driv e the Gain harder if you know that unexpected input
level changes are unlikely to occur. Watch if the Clip-LED indicates clipping in the preamplifier stages and set the VU Cal to
-10dB to adjust the VU meter range accordingly.
IMPORTANT: The Clip-LED should never illuminate during a
recording session to avoid distorted results.
GoldMike MK2
Control Elements
Output
This potentiometer adjusts the o utput level for de vices following
in the chain or to the converter. The Output Level control allows
an additional +6dB of amplification or -26dB of reduction.
Output level values set with the output level cont rol are not indicated by the VU meters, which indicate pre-amplification levels
before this final stage.
Phantom
The GoldMike MK2 provides 48 Volt phantom power for microphones requiring external current (generally condenser microphones). Such microphones are dependent upon a clean, consistent and noise-free power supply for optimal operation and
audio qualit y. The GoldMike MK2 cont inuously delivers p recisely
48 V and a maximum of 14 mA, which will power all microphones.
VERY IMPORTANT: All microphones with balanced, groundfree outputs, including tube microphones, can be used with
the phantom power activated. Phantom power should only be
activated when using microphones that require it. Unbalanced
microphones may only be used with phantom power deactivated. Please be sure to deactivate phantom power with all
other microphones.
Output
-9
-8
-10
-6
-12
-26
dB
PHANTOM
48V
Off
-5
-2.5
0
2
3.5
5
5.5
6
-14
-16
-18
-20
-22
-24
-25
PLEASE ALWAYS FOLLOW THESE INSTRUCTIONS TO ACTIVATE
AND DEACTIVATE PHANTOM POWER: First connect the micro-
phone to the GoldMike MK 2, then activate phantom power. When
finished, first deactivate phantom power and wait at least until
the 48V LED has gone out completely before disconnecting the
microphone! This ensures residual current will be discharged.
Furthermore, when changing microphones, you should wait
until the 48V LED is completely dark before re-patching. THE
GOLDMIKE MK2’S INPUT STAGES CAN BE DAMAGED IF YOU
IGNORE THESE PROCEDURES!
GoldMike MK2
11
Control Elements
PHASE
Rev.
Nor.
PAD
dB
-20
Off
HI PASS
Hz
50
Off
Phase
The phase reverse function reverses the polarity of the microphone signal, inverting the phase (by 180°) to correct phaseinverted signals caused by multiple signal sources. A voiceover artist, for example, hears himself during recording through
the headphones and simultaneously through the bones in his
head. Phase inversion will cause an unnatural sound, and
even minimal variations in distance to the microphone will
cause drastic variations in the sound. Phase inversion is also
commonly encountered when using multiple microphones on
a single sound source. We recommend checking for correct
polarity before each recording.
Pad
The Pad switch attenuates the input by -20dB. High-level input
signals can be attenuated in order to prevent overdriving the
preamplifier. The GoldMikeMK2 has a minimum pre-amplif ication of +14dB. But with miked signals such as drums and brass
or high level line input signals, this may already be too much.
Engaging Pad attenuates the minimum pre-amplification (Gain
control fully counter clockwise) to -6dB, thus providing a useful
Gain control range for loud input signals.
Hi Pass
12
This switch activates the integrated high-pass filter, whic h operates at a 50 Hz center frequency and 12dB/octave (often called
a „rumble filter“). The filter is entirely passive, avoiding additional active circuitry that could potentially degrade the signal,
and cuts 6dB pre- and 6dB post-solid-state stage pre-amplification to prevent the amplification of unwanted low-frequency
signal components.
GoldMike MK2
Control Elements
Flair
As with its predecessor, the model 9844 GoldMike, the
GoldMike MK2 features our sound-optimizing Flair circuit ry. This
circuitry takes advantage of a combined coil and tube filtering
to enhance signal presence. In comparison to simple EQ manipulation, this intensif ied presence sounds very natural and unob trusive, and is particularly suited for optimizing the overtones
in voice and acoustic instruments.
Through Flair, a recorded signal gains richness in detail, presence, intelligibility (for voice) and in an increased ability to cut
through in a mix. In such mixes, a Flair-processed signal stands
out without resort to conventional processing often unsuited to
the task, saving both time and a need for artificial processing.
Flair works through an emphasi s in the 1.5-20 kHz range centere d
around 6 kHz.
The GoldMike MK2 provides for two different settings, with a
“High” setting of +2.5 dB and a “Med.” with +1.5 dB emphasis.
An Off setting allows you to deactivate the Flair circuit entirely.
Tube Amp
The Tube Amp switch varies the degree of tube pre-amplification added to the discrete class A pre-amplification, which itself
is set with the Gain control. The switch allows for three settings:
+6dB (standard) +12dB and +18dB. In each setting, the output of
the tube is automatically reduced in proportion to the increased
input, thus eliminating affects to the overall output level - there
is no need to recalibrate. This allows for instant comparison
between varying Tube Amp values and their sonic ef fects. (see
„About Gain Adjustments” on page 10).
FLAIR
High
Off
Med
TUBE AMP
dB
18
6
12
GoldMike MK2
13
Control Elements
Using the Tube Amp switch
Engaging the Tube A mp s w it ch t en d s t o h a ve a significant impact
on the overall sound, as it directly changes the sonic character
of the tube. The higher the Tube Amp value, the more you will
have tube saturation and harmonic distortion, in addition to
limiting effects. These effects can be used creatively to shape a
sound.
Subtle overdrive of the tub e creates moderate s aturation ef fects
and relatively little harmonic distortion—the limiting effect s are
already present. If this behavior is desired, try a +12 dB setting
with the Gain control also set to moderate pre-amplification.
For a more dramatic tube sound the Tube Amp switch should
be set to +18 dB. This results in a very audible saturation and
harmonic distortion. The intensity can then be fine-tuned with
the Gain control: The more gain, the more “phatt”.
Tube li miting cont rols peaks in a musically advantageous
fashion and can be used to complement the Limiter. The tube
limiting is not as accurate and sonically neutral as the PeakLimiter because harmonic distortion is added to the signal.
To f ull y pr otect connected converters you should keep the PeakLimiter active and monitor the action of the VU meter, the Clipand Limiter-LED.
14
GoldMike MK2
Control Elements
Limiter
The GoldMike MK2 offers a peak limiter that operates before
the output level control. This ensures that the limited signal can
be controlled as perfectly as possible for the internal—or an
external—converter.
The peak limiter operate s with special diodes t hat convert signa l
peaks into a pleasant-sounding saturation. Depending on the
signal, this allows for an effective and subtle level limiting.
Diode-based limiting works very quickly (much faster than
common VCA- or FET-based limiters), reliably limits even microsecond-long transients, and is very effective for drums and
percussion. The peak limiter also enables maximum loudness.
Its degree of activity is displayed via the Limit LED.
The peak limiter is ideally suited to limit signals with a high
degree of transient s such as snare, kick, bra ss and other percu ssion instruments. Sine-wave like signals such as vocals, flute
and layer sounds can also be protected, but the degree of
increased loudness is limited.
Overdriving the peak limiter will be audible as distortion, an
effect quite similar to overdriving the preamplifier. In order to
avoid irritations please monitor the Clip-LED. If the Clip-LED is
not illuminating, the distortion is coming from the peak limiter.
In that case reduce the Threshold value. T here are two threshold
values to choose from: +12 dB and +18 dB. Limiting is less when
selecting the +18dB threshold and intensified when choosing
+12 dB. If the Limit LED illuminates constantly, you should select
the +18 dB setting or reduce the Gain control setting (also see
“Limit-LED“ on page 17).
LIMITER
dB
18
Off
12
After setting the Limiter you can adjust the output level signal
for equipment coming next in your chain. If you have opted for
the internal A/D converter, you should keep an eye on the A/D
Ovl LED. When this LED illuminates, the internal A/D converter
is clipping. Reduce the output level until the A/D Ovl LED goes
out. If external converters are used, check their clipping LEDs
when setting the output level.
This placement of the limiter before the output level control
helps exploit the headroom of A/D converters to the maximum
while at the same time offering a signal peak safety margin.
GoldMike MK2
15
Control Elements
VU CAL
-10
0
SOURCE
Instr.
Line
Mic
48 V
dB
n
u
o
S
20
%
Clip Limit
o
r
m
f
r
e
P
d
3
5
1
7
10
70
100
50
30
0
VU
1
VU-Cal
The display range of the VU meter can be shifted u sing the -10dB
VU Cal switch position.
If the VU Cal switch is set to its 0 dB position and the output
level control is also set to 0dB with the limiter switched off,
the output level will effectively be 0 dBu.With the VU Cal set to
-10 dB the 0 dB mark on the VU meter will represent a +10 dBu
output level. This way you can display audio level higher than
+6 dB (up to +16 dB) on the VU meter.
Source
This switch allows you to select between the Mic and Line/
Instrument inputs. All inputs can remain connected at all times,
regardless of which input is selected. You can choose the Line
input as source as long as the Instrument Input is not being
used.
If you engage this switch first after powering up the unit, there
can be a noticeable pop due to the discharge of residual current.
This is normal and no cause for concern.
AD OVL
a
n
c
e
L
a
b
0
3
5
Central Display
The display consists of all status LEDs and the VU meter so that
all important information can be viewed without distraction.
16
Display/VU Meter
The VU meter shows the internal gain level (not the output
level). Its scale ranges from -20 dB to +6 dB. If needed, the sensitivity can be reduced by 10 dB, which ex tends the scale to +16 dB
(see “VU Cal“ above). Please refer as well to the information
“About Gain Adjustments” on page 10.
GoldMike MK2
Control Elements
Display/48 V LED
The 48V-LED indicates that the phantom power supply is activated. The 48V-LED will slowly dim before going out to indicate
that it takes some time for residual current to discharge.
VERY IMPORTANT: The connection between microphone and
GoldMikeMK2 should not be disengaged before the LED is
completely dark! To avoid damages, please note also the
phantom power supply usage information on page 11.
Display/Clip LED
The Clip LED shows internal clipping of the G oldMike MK2. To avoid
distorted results the Clip-LED should never illuminate during a
recording session (also refer to “About Gain Adjustments“ on
page 10).
Display/Limit LED
The Limit LED show s the activit y of the Peak Limiter s. The Limiter
threshold can be set to 12 or 18 dBu, and for optimal operation,
should only illuminate in very short intervals. If the LED is illuminating too often even at the 18 dB position, you must reduce the
Gain value (and possibly afterwards, further adjust the output
level) to achieve unobtrusive results—unless, of course, you
really want this effect (also see the chapter „Limiter“ on page
15).
Display/AD OVL LED
This LED is only active when the optional AD converter module
is installed. It displays clipping in the internal AD converter
and illuminates at approximately 0.5 dB before 0 dBfs. This LED
should never illuminate when using the internal or an external
converter. If it does, the output level must be reduced accordingly. For further information on the converter module see page
22, “Optional Digital Output: 24/96 AD converter, model 2376“.
With external converters in use, please always check their
internal clipping displays.
GoldMike MK2
17
Technology
Solid State And Tube Stages
The solid stage preamp section is based on a fully discrete,
balanced instrument amplifier and operates 12 single transistors in class A mode. A sophisticated circuitry ensures a nearly
constant frequency response at any gain level. With an impressive slew rate of mor e th an 2 00V/µs the solid stage is capable to
amplify highest frequencies and fastest transients with almost
no distortion, which is crucially important to achieve a realistic
sound experience. Coupling condensers were used as sparingly as possible to avoid their inherent disadvantages such as
diff use sound, slurring a nd lo s s o f d yn a mi cs . These a re replaced
by servo circuits, which eliminate DC artifacts.
An op-amp subsequently converts the instrument amplifier’s
output signal into an unbalanced one, which is then fed to the
tube. Here an additional +6 dB tube amplification is added,
switchable to +12 and +18 dB with the Tube Amp function.
The tube type—a Sovtek® 12 AX7 LPS—was also selected after
extensive measurements and listening tests. This tube type
outclasses the standard 12 AX 7 by far and delivers an open,
transparent sound, excellent noise values and is especially reliable. An impedance converter adapts the tube’s high-impedance signal to the following stages.
18
Output Stage
The output stage can drive very long connections (depending on
cable capacities, up to several hundred yards). The max. output
level is at +26 dBu, allowing plenty of headroom to drive subsequent converters.
GoldMike MK2
Class A Instrument Input
The Instrument Input is a fully discrete im pedance converter that
also operates in class A mode. It is based on a low-noise field
effect transistor that, due to its extremely high input impedance, is especially well suited to this task.
Relay Switching
In order to ensure the shortest possible signal paths, nearly all
switching functions are handled by optimal ly positioned, en capsulated relays with gold-plated contacts (the switches themselves only trigger the relays). Since resistors also greatly affect
audio quality, the entire audio signal path utilizes painstakingly
selected resistors with 0.1 % tolerance.
Foil Condensers
The op-amp circuits use premium FKP foil condensers, which
sound much more open than ceramic types and provide more
natural dynamic response.
Technology
GoldMike MK2
19
Power Supply
In the case of the power supply, no expense was spared. Af ter
all, the power supply is one of the primary factors in the audio
quality and overall sound of any device. Just like the best coffee
beans in the world will not produce a good cup of cof fee with
poor water, the best circuits can’t produce a great sound with
unreliable, inconsistent current. The transformer delivers three
different voltages, each of which is separately screened and
regulated: 250-V anode current for the tube, 48V for phantom
power and 2 x 15V for the audio signal path.
Critical currents are stabilized via a 100-nF MKP foil condenser,
to ensure sufficient current for even the shortest impulses.
The transformer is encompassed by double shielding to keep
magnetic stray fields to an absolute minimum.
An AC power cord is included for connection to the standard
3-prong IEC connector. The transformer, power cord and IEC
connector are VDE, UL and CSA approved. The AC fuse is rated
at 315 mA for 220/240 V and 630 mA for 110/120 V.
20
GoldMike MK2
• 24-Bit/96kHz A/D converter (upgrades after sale can be done
by clients).
• Lundahl input and output transformers (upgrades after sale
by authorized service personnel or SPL only).
24/96 A/D Converter
Options
SYNC
LOCK
DIGITAL OUTPUTSSYNC INPUT
OPTICAL
Made in
Taiwan
24/96 AD
Converter
Model
2376
SAMPLE RATE
44,1
x2
48
SPDIF SPDIF
INPUT OUTPUT OUTPUT
The optional 24/96 Converter module (model 2376) provides a
digital output for the GoldMike MK2 in the form of an S/P-DIF
output with RCA and optical connectors (in parallel). The
converter transmits 24-bit signals.
The module is based on a 24-bit converter by AKM® with a
variable sample rate of up to 96 kHz. All common sample rates
can be selected (see below). Highly accurate quartz oscillators
ensure a clean, low-jitter master clock.
Sample Rate
The 24/96 AD converter module allows you to select among the
four most common sample rates of 44.1, 48, 88.2 and 96 kHz.
Using the 44.1/48 button, select one of the two basic sample
rates (out: 44.1 kHz; in: 48 kHz). The x2 button doubles these
sample rates to select 88.2 or 96 kHz respectively.
Dig. Out
The converted S/P-DIF signal is routed in parallel to the RCA
and optical outputs. The signal is in professional format with no
sample rate data in the status block.
GoldMike MK2
21
Options
Sync Input
The SYNC input allows you to feed an external signal into the
converter to control the sample rate. Connect an S/P-DIF output
from your master source (e.g. sound card) to the SYNC input.
The AD converter will automatically switch to the same sample
rate that is received. The 2376 is not equipped to accept Word
Clock synchronization.
The yellow Sync Lock LED illuminates when a valid sync signal
is present at the Sync input and the converter is automatically
synchronized to the external sample rate.
To prevent interference, the internal oscillators are automatically disabled when an external clock signal is present. If the
sync signal is no longer present (e.g. in the case of a dropout),
the converter automatically reverts to the sample rate selected
via the converter’s control switches.
Lundahl Transformers
Tra ns for mers hav e ch ar acteristics usually associated with other
analog components like tubes or coils—they sound “warmer”,
and punchier especially in the bass and mid area and deliver
improved presence without boosting the top end. One reason
for this is that transformers cancel out a large amount of odd
harmonics (those portions of an audio signal that sound harsh
to human ears).
22
Equipping the GoldMike MK2 with transformer-based inputs
and outputs means you benefit from their unique characteristics.
IMPORTANT: The GoldMike MK2’s input transformer delivers up
to +14 dB of additional passive gain, which must be added to
the printed values.
GoldMike MK2
Specifi cations
Frequency response ‹10 Hz to 90 KHz (-3 dB)
Input impedances
Microphone, XLR 2,8 KOhm
Line In, TRS 10 KOhm
Instr. In TRS 1 MOhm
Output impedances XLR and TRS connectors 50 Ohm
THD+N
Input level Gain
-30 dBu 30 dBu 0,016 %
-40 dBu 40 dBu 0,017 %
-50 dBu 50 dBu 0,022 %
-60 dBu 60 dBu 0,048 %
Noise, A weighted, R=40Ohm
Gain
30 dB -91,2 dBu
40 dB -86,6 dBu
50 dB -78,7 dBu
60 dB -69,3 dBu
Dynamic range, 30 dB Gain 110 dB
E.I.N 128 dBu
Max. Input level
Mikrophone, XLR +7 dBu
Mikrophone, XLR +PAD +28 dBu
Line In, TRS connector +23 dBu
Instr. In TRS connector +7 dB u
Instr. In TRS connector +PAD +14 dBu
Max. output level
Balanced, XLR+TRS +26,8 dBu
Unbalanced, XLR+TRS +21,5 dBu
CMRR
1 KHz, Gain 30 dB ›75 dB
10 KHz, Gain 30 dB ›75 dB
Power consumption 25 W
Dimensions B x H x T 482 x 88 x 210 mm/19.28 x 3.52 x 8.4 in
Weight 4,1 Kg/9.02 lbs
Specifications subject to change without notice.
GoldMike MK2
23
Warranty
SPL products are manufactured using caref ully selected compo nents and materials and state-of-the-art production technology. Every SPL product is thorough inspected and tested before
leaving the factory, including acoustic and electronic testing.
SPL warrantees the SPL 24/96 AD Converter Model 2376 to be
free of defects in materials or workmanship for a period of 24
months after the date of purchase. Should any trouble caused
by defects in materials or workmanship develop during this
period, SPL will repair or, at our option, replace the product
at no charge. Should SPL choose to replace the product, we
reserve the right to replace it with a newer model.
In order to validate your warranty, you must either return
the enclosed warranty registration card, completely filled
out, to SPL, or register your product online within 14 days
of purchase. You may register your product online at
www.soundperformancelab.com or, in the USA or Canada at
www.spl-usa.com.
The warranty period begins on the date of purchase. The
warranty is non-transferable. Repairs or replacements do not
extend the warranty period.
This warranty does not apply if:
• the product was not purchased from an authorized SPL
dealer
• repairs are required due to normal wear and tear
• the product has been abused, misused or improperly
maintained, or if repairs or alterations have been made
or attempted by any other than authorized SPL service
personnel
• the serial number has been removed or defaced
In no event shall SPL be liable for any indirect, incidental or
consequential damages from the sale or use of this product,
either during or after the warranty period.
SPL disclaims liability for any implied warranties, including
implied warranties of merchantability and/or fitness for a
specific purpose, after the warranty period.
This warranty gives you specific legal rights. You may have
other rights, which vary from country to country and state to
state. Some of the above limitations may not apply to you.
SPL electronics GmbH, 41372 Niederkruechten, Germany
24
GoldMike MK2
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