SPL GoldMike MK2 Dual-Channel Preamplifier

PL GoldMike MK2 Overview

SPL’s 2485 GoldMike MK2 is a discrete Class-A, dual-channel microphone and instrument preamplifier with a transistor stage. The GoldMike Mark2, like its predecessor, uses a hybrid solid state and tube architecture to provide the best of both worlds.

A 24-bit, 192 kHz A to D converter is an optional feature

The rack-mountable GoldMike MK2 boasts improved tonal flexibility and adaptability, making it an ideal dual-channel front end for practically any modern production situation.
The GoldMike MK2 is the culmination of all of our expertise and knowledge from its predecessor, and it represents an enhanced, more versatile, and modernized version.

We’ve included technology that has already been shown to improve tonal outcomes in other SPL products. For example, the instrument input is based on a Class-A impedance converter introduced in the SPL GainStation.

The hybrid preamplifier idea had a vital role in the predecessor’s success. It blends transistor and tube preamplifier stages, focussing on their technological and acoustic advantages: The efficiency and low noise of a discrete transistor stage are enhanced by the musical coloration of a tube stage.

We’ve included technology that has already been shown to improve tonal outcomes in other SPL products. For example, the instrument input is based on a Class-A impedance converter introduced in the SPL GainStation.
The hybrid preamplifier idea had a vital role in the predecessor’s success. It blends transistor and tube preamplifier stages, focussing on their technological and acoustic advantages: The efficiency and low noise of a discrete transistor stage are enhanced by the musical coloration of a tube stage.

The transistor stage is made up of single transistors in a Class-A configuration. The circuitry is entirely discrete, with each transistor perfectly optimized for its specialized function. There will be no ICs in this preamplifier stage since they cannot be optimized to the degree that SPL aims for. The discrete Class-A transistor stage was designed particularly for this preamplifier.

The degree of tube pre-amplification is no longer set at +6 dB like its predecessor. The GoldMike MK2 offers three alternative tube pre-amplifications: the basic +6 dB, +12 dB and +18 dB. This provides you with more creative options with tube saturation and limiting effects. Experiment to get the sounds you want.

We have also added a parameter to the popular Flair circuitry to extend the versatility of the “presence” upgrade.
Channel separation is critical for stereo imaging because the GoldMike MK2 is a dual-channel preamplifier. As a result, the print-board arrangement is symmetrically duplicated from channel 1 to channel 2, with the power supply in the center. This produces an identical signal flow that supports a naturally balanced stereo picture. Furthermore, the print board has extra-large ground portions, maximizing protection against crosstalk and interference.

Adjust the sound of your world with the GoldMike MK2

•  Discrete Class-A solid stage.
•  Tube drive at three intensity levels.
•  Two-channel Class-A microphone and instrument preamplifier.
•  Adjustable tube preamplification circuitry.
•  Enhanced presence with two switchable settings.
•  The pre-output limiter step provides quicker diode-based operation and protects A/D converters.
•  The instrument input is located on the front panel, with separate microphone and line inputs on the back.
•  Features include phantom power, phase reversal, pad, and high-pass filter (at 50Hz).
•  I am switching inserts.
•  VU metering with three switchable display ranges.
•  A 24-bit, 192 kHz A-D converter is an optional feature.
• SPL GoldMike MK2 dual-channel preamplifier

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 dBu

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

E.I.N.

-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 300 mm

19 x 3.46 x 11.8 inch

Unit weight

4.1 kg

9.04 lbs

Shipping weight (incl. packaging)

6.5 kg

14.33 lbs