SONCOZ
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Bring your analog sources together with precise volume control and flexible system matching. The SONCOZ SGL7 combines a fully balanced analog signal path, relay-controlled R-2R attenuation and separately powered analog and digital control sections. Whether you are settling in for a late-night vocal album or switching to a large-scale orchestral recording, its gain settings and three analog voicing modes let you tailor your setup without DSP.
A 12-bit R-2R resistor network uses sealed relays rather than a sliding potentiometer for attenuation. The specified adjustment range is -54 dB to 0 dB in 0.25 dB steps, with channel tracking error below 0.05 dB. Fine adjustment helps you set a comfortable listening level while maintaining left/right balance.
Independent transformer windings, rectification and regulation serve the audio stages and digital control circuitry. This separation is designed to reduce control-circuit noise entering the analog signal path. The supplied specification lists a 3 µV noise floor.
An MCU manages relay timing during startup, shutdown and input changes. Muting and sequencing are designed to reduce switching transients, helping provide smoother operation when changing sources.
Select 0 dB, +3 dB or +6 dB gain to match your source output level and downstream equipment. Set gain conservatively to avoid overloading the next component.
The voicing modes adjust analog-stage operating parameters rather than applying digital equalization. Perceived differences will depend on your source, amplifier, speakers and recordings.
Connect up to two balanced XLR sources and three RCA line-level sources. Two XLR outputs and one RCA output provide options for compatible power amplifiers, active speakers or a powered subwoofer. The RCA output is not specified as a dedicated filtered subwoofer output.
For vinyl playback, connect the output of a suitable external phono preamplifier. Do not connect a turntable cartridge directly to a line-level input unless the turntable has a built-in phono stage. Digital sources need an analog output or a separate DAC.
The 3.7-inch IPS LCD has a 240 × 960 resolution, five brightness levels and four seasonal interface themes. Front-panel buttons and a multifunction rotary encoder provide direct operation. Each of the five inputs stores its own volume, gain and voicing settings, retained after power-off.
The supplied documentation describes standby after a 90-second muted or idle period followed by a 10-second countdown. Front-panel or remote commands wake the unit. Infrared remote operation is available with the remote-equipped variants.
A CNC-machined aluminum enclosure uses separate internal compartments for power, amplification and control circuitry. The 430 mm-wide chassis weighs 8 kg. Trigger input/output uses 3.5 mm mono connections with a specified 5–12 V DC range for compatible equipment.
| Model | SONCOZ SGL7 |
|---|---|
| Type | Fully balanced analog preamplifier |
| Volume Control | 12-bit R-2R relay attenuation |
| Volume Range / Step | -54 to 0 dB / 0.25 dB |
| Channel Tracking Error | <0.05 dB |
| Gain Settings | 0 dB, +3 dB, +6 dB |
| Inputs | XLR balanced × 2; RCA unbalanced × 3 |
| Outputs | XLR balanced × 2; RCA unbalanced × 1 |
| Frequency Response | 20 Hz–40 kHz (±0.1 dB) |
| Noise Floor | 3 µV |
| THD+N | <-116 dB at 1 kHz, A-weighted |
| Crosstalk | <-140 dB at 10 kHz |
| Maximum Input / Output | 10 Vrms / 8 Vrms (XLR and RCA) |
| Input Impedance | >20 kΩ XLR; >10 kΩ RCA |
| Output Impedance | 100 Ω XLR; 50 Ω RCA |
| Display | 3.7-inch IPS LCD, 240 × 960 |
| Trigger | 3.5 mm mono; 5–12 V DC |
| Mains Supply | AC 110 / 220 V, 50 / 60 Hz |
| Power Consumption | Approximately 10 W |
| Dimensions | 430 × 268 × 50 mm |
| Net Weight | 8 kg |
| Color Options | Silver / Black |
Performance figures above are drawn from the supplied product documentation; measurement conditions apply.
Confirm the mains voltage selector matches your local supply before connecting power. The internal op-amps are socketed, but replacements must be electrically compatible with the specific socket and circuit. Disconnect power before servicing; op-amp replacement should be performed by a qualified technician if you are unfamiliar with the procedure.



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