SPL GoldMike Mk2

SKU: GoldMike Mk2

Dual Channel Microphone and Instrument Preamplifier


About this item



SPL GoldMike Mk2

The GoldMike Mk2 combines the advantages of Class A transistor amplification with tube amp technology.

Class-A meets Tube

The GoldMike Mk2 is a hybrid preamplifier consisting of a discrete transistor stage and tube stage. The hybrid design of the preamplifier combines the advantages of semiconductors (high dynamics with low distortion, low noise) with the musical qualities of tube sound (pleasant high/overtone spectrum, beautiful three-dimensionality).

The microphone class A transistor preamplifier is discretely constructed from 16 individual transistors.

The preamplifier features 48 V phantom power, polarity inversion, padding, and a Butterworth Hi-Pass filter.


The instrument input is a discrete impedance converter that also operates in class A mode.

The core is a low-noise field-effect transistor, which is ideally suited as an impedance converter due to its very high input resistance.


A compressor, de-esser, limiter, or even a reverb unit can be switched between preamp and output.


The VU shows the audio “energy” level, and the clip LED warns of clipping. If optional AD converters are installed, the AD OVL LED also warns of converter overloads.


The limiter is based on diodes whose characteristic curve produces a nice, analog saturation effect and thus unobtrusively limits the signal peaks.

Its speed makes it suitable as a peak limiter, which can intercept transients in the microsecond range and can thus function very well as protection for the AD converter.


This circuit uses the pleasant sound characteristics of the coils in combination with the tube to emphasize the presence range. It is ideally suited to intensify the overtone range of voices and acoustic instruments, thus improving the ability to cut through in the mix.

Tube Amp

The proportion of tube gain to total gain can be switched in three stages. The higher the value, the more pronounced the saturation effects and overtones of the tube.

Lundahl Transformers

The Sonic Aspects

Transformers are used as an alternative to electronic balancing stages in the inputs and outputs.

Transformers can be found in many classics of audio engineering. They make the bass and fundamental tines rounder and give it a little more punch. The high and overtone range sounds a bit silkier and more present.

We find transformers to be advantageous, especially for voices. For the highest precision and speed in signal transmission (transient processing), however, electronic stages are better suited. The bottom line is that it is a question of taste and application.

In the Mic Preamplifier

In the case of preamplifiers or channel strips, the 2161 input transformer, which is specially designed for microphone inputs, provides an additional gain of up to 14 dB (depending on the microphone), which must then be added to the scaling.

This relieves the microphone preamplifier. Since the transformer ratio passively increases the level, no noise is added. Therefore, the input transformer is more important than the output transformer in preamplifiers.

However, it is only when both transformers are fitted that all positive sonic aspects are achieved – as well as increased operational reliability.

AD Converter Module 1090

The 24-bit converter module provides a SPDIF output which is available as coaxial and optical output.

The internal sampling rate can be set with switches to 44.1, 48, 88.2, and 96 kHz. Other sampling rates (32, 176.4, 192 kHz) can only be set with an external synchronization signal.


Line/Insert inputs & outputs; XLR (balanced) & Jack (unbalanced)

Maximum input gain
23 dBu
Input impedance
10 dBu
Maximum output gain (balanced)
26,8 dBu
Maximum output gain (unbalanced)
21.5 dBu
Output impedance
50 Ω
Common mode rejection (1 kHz, 0 dBu)
70 dB
Frequency range (-3 dB)
10 Hz – 90 kHz
THD + N (0 dBu, Line Gain unity, Tube Gain +6 dB, 10 Hz – 22 kHz)
0,04 %
Noise (A-weighted, 600 Ω)
-88,5 dB
Dynamic range
110 dB

Microphone Preamplifier

Maximum input gain (Mic)
7 dBu
Maximum input gain (Mic, PAD)
28 dBu
Input impedance (Mic)
2.8 kΩ
Frequency range (Tube Gain +6 dB, -3 dB)
10 Hz – 93 kHz
Frequency range (Tube Gain +12 dB, -3 dB)
10 Hz – 61 kHz
Frequency range (Tube Gain +18 dB, -3 dB)
10 Hz – 34 kHz
THD + N (1 kHz, 30dBu Gain)
0.016 %
Noise (A-weighted, 150 Ω, 30 dB Gain)
-91.2 dBu
-128 dBu
Dynamic range
110 dB

Instrument Preamplifier

Maximum input gain (Instrument)
7 dBu
Maximum input gain (Instrument, PAD)
14 dBu
Input impedance (Instrument)
1 MΩ
Frequency range (Tube Gain +6 dB, 600 Ω, -3 dB)
10 Hz – 68 kHz
Frequency range (Tube Gain +12 dB, 600 Ω, -3 dB)
10 Hz – 51 kHz
Frequency range (Tube Gain +18 dB, 600 Ω, -3 dB)
10 Hz – 35 kHz
THD + N (Tube Gain +6 dB, 10 Hz – 22 kHz)
0,05 %
Noise (A-weighted)
-95.5 dBu
Dynamic range
105 dB

Internal Linear Power Supply with Toroidal Transformer

Operating voltage for analog audio
+/- 18 V
Operating voltage for relays and LEDs
+12 V
Tube anode voltage
+250 V
Tube heating voltage
+12,6 V
Phantom power
+48 V

Mains Power Supply

Mains voltage (selectable)
230 V AC / 50; 115 V AC / 60 Hz
Sicherung für 230 V
T 315 mA
Sicherung für 115 V
T 630 mA
Power consumption
max. 25 W

Dimensions & Weight

W x H x D (width x height x depth)
482 x 88 x 210 mm
19 x 3.46 x 8.23 inch
Unit weight
4.1 kg
9.04 lbs
Shipping weight (incl. packaging)
6.5 kg
14.33 lbs

Reference: 0 dBu = 0,775V. All specifications are subject to change without notice.

This product was featured in our Installation projects


The Huntington Theatre Company is a famous non-profit performing arts organization located in Boston, Massachusetts. It was established in 1982 and has since developed into

Our mission at Parsons Audio is to provide solutions that help engineers, educators, musicians, studio, and venue owners realize their goals. When the owners of

2022 has been a busy year for us here at Parson’s Audio. We’ve been busy doing sound system installations all over New England. The Groton

Different Solutions For You


Professional Installation Services

Flawless audio systems for studios and venues


Audio Solutions for Education

Elevate learning experiences with tailored audio solutions


Outstanding Video Solutions

Visual experiences with state-of-the-art video technology