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SPL VOLUME 2 Volume Controller with Instrumentation Amplifier

The Volume 2 is a fully balanced dual channel analog volume control with Mute switch designed with active circuitry for stable impedance and linearity.



Volume 2

Stereo Volume Controller

The Volume 2 is a fully analog active stereo volume controller and a puristic high-end preamplifier.

It focusses on analog monitor leveling an sports a Mute switch that in case of a computer crash protects your speakers, headphones and ears.

The Volume 2 is a fully balanced dual channel analog volume control with Mute switch designed with active circuitry to circumvent inevitable disadvantages of passive circuitries that result in impedance variation and degraded linearity in frequency response.


  • The Volume 2 is built only with analog circuitry and performance, and its high quality parts in sophisticated circuitry design are prerequisites to superior audio quality:
  • High end volume potentiometer and illuminated mute switch from ALPS; the potentiometer controls signals directly (without VCA or DAC circuitry)
  • Balanced XLR in- and outputs
  • A high quality power supply with toroidal transformer
  • Massive, 45 mm diameter aluminum knobs ensure consistent, refined handling
  • The elegant, compact format housing (215 x 80 mm or 8.5 x 3.1 inch) allows for flexible desktop positioning near or under a computer monitor or generally saving space in positioning
  • Additional reasons to employ the Volume2
  • High quality balancing stages with extremely good common mode rejection minimize interferences and disturbances in the signal paths
  • The mute switch allows for very fast reaction times in cases where loud speakers or ears should be protected (for example, with computer crashes)
  • Users of analog summing without monitoring facilities can cost effectively improve their systems
  • Special Features
  • Inputs/Outputs: Instrumentational amplifier, electronically balanced (differential), transformerless
  • Nominal Input Level: +4 dBu
  • Input Impedance: =22 kOhm
  • Output Impedance: ‹ 600 Ohm
  • Max. Input Level: › +20 dBu
  • Volume Gain: ∞ to -4 dB
  • Frequency Range: 10 Hz-100 kHz (100 kHz = -3 dB)
  • CMRR: › 60 [email protected] kHz
  • THD: & N (@ +15 dBu Input Level) › -100 dBu
  • S/N A-weighted: -102 dBu
  • Crosstalk L/R (@ 1 kHz): › -80 dBu
  • Dynamic Range: 120 dB
  • Power Supply:
  • Toroidal transformator: 3,5 VA
  • Fuse: 250 mA/230 V, 500 mA/115 V
  • Voltage Selector: 230/50 Hz ‹› 115 V/60 Hz
  • Power Consumption: 15 W
  • Dimensions & Weight:
  • 215 x 80 x 220 mm/8.5 x 3.1 x 8.8 inches, depth incl. potentiometer, Sockets: 245 mm/9.8 inches
  • Weight: 1.6 kg/3.52 lb
  • Notes: 0 dBu = 0.775 V
  • Subject to change without notice.


Who needs analog level control?
Simply put—most DAW (Digital Audio Workstation) users. A majority of D/A converters and sound cards provide nothing in the way of analog level monitoring control, and this means the necessity of varying signal levels at the converter outputs. The result is a lowered bit rate in the monitoring signal, which can lead to commensurate loss of audio quality.
A further, very interesting application area is in the construction of a straight, audiophile-quality stereo playback chain, where the Volume2 is situated between the playback machine and either power amp and speakers or simply active speaker system. In such cases, the playback machine must offer analog outputs. This provides for minimal financial and electronic efforts through the most direct possible playback path.
Common AV receivers employ VCA and DAC components which tend to produce more distortions, or the signal runs through further AD/DA converters for the volume control. Thus especially with SACD or DVD-A sources, only a high-quality analog, direct control of the source output ensures an unimpaired playback of the original information.

Unbalanced connections, e. g. to and from RCA or TS Jack:
You can establish unbalanced connections easily and without adaptors – for example from CD-Players with RCA outputs or to (HiFi) power amplifiers with RCA inputs. In any case we recommend to use readily configured cables from XLR to the respective RCA or TS/TRS connector to dispense with adaptors. Ask your dealer for configured cables. It is important to pay attention to the correct polarity of the three XLR wires. With the XLR pin configuration diagram in our manuals any audio expert can ensure to select or configure appropriate cables.




Additional information

Additional information

Weight 1.6 lbs


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