ADA-21S STEREO AUDIO DISTRIBUTION AMPLIFIER

AUDIO CONFIGURATIONS:

The source and destination audio equipment must be evaluated to determine if they are Balanced or Unbalanced. After determination is made, refer to the drawings provided to select the proper audio configuration. The outputs can be any combination of balanced or unbalanced.

 

 

 

 

 

 

 

ADA-21

 

 

 

 

 

 

 

+

 

 

+

 

 

 

 

 

+

+

 

 

 

 

C

 

 

 

C

C

C

 

 

 

-

 

 

 

 

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

IN OUT

Balanced In to Balanced Out

Vout = Vin

 

 

ADA-21

 

+

+

+

+

Gnd

C

C

C

 

-

-

-

 

 

 

 

 

IN OUT

Unbalanced In to Balanced Out (-) Input Grounded; Vout = Vin

(-) Input Floating: Vout = 0.75 Vin

 

 

 

 

 

ADA-21

 

 

 

 

 

+

 

+

+

 

 

 

+

 

 

C

 

C

C

C

-

 

 

 

-

-

Open

 

 

 

 

 

 

 

 

 

 

IN OUT

Balanced In to Unbalanced Out

Vout = 0.5 Vin

 

 

 

 

ADA-21

 

+

 

+

+

 

 

+

Gnd

 

 

C

C

 

 

C

 

 

 

 

 

 

 

-

-

 

 

Open

 

 

IN OUT

Unbalanced In to Unbalanced Out Vout = 0.5 Vin

The input to output level comparison provided in the figures above, assumes the outputs are terminated into a 600Ω load.

FRONT PANEL:

The adjustments and indicators on the front panel (Figure 3) can be accessed through the slots provided in the frame in which the ADA-21S is installed. When mounted within the SS-2100 Series frames, it will be necessary to remove the front panel of the frame to gain access to these items. Factory settings of the module provide unity gain when terminated in 600Ω, and a bandwidth of 30 KHz.

Gain control for the right channel is achieved by adjustments to S01and R012. Gain control for the left channel is achieved by adjustments to S901and R912. S01 and S901 provide gain adjustment in increments of 6dB, while R012 and R912 provide fine adjustments of +/- 3dB. The positions of S01 make the following adjustments to the gain level of the circuit - = OFF, 1= -6dB, 2= 0dB, 3= +6dB, 4= +12dB, 5= +18dBand 6= +24dB.

 

1 2 3

4 56

 

1 2 3

4 56

R912

S901

 

R012

S01

 

Figure 3: Front Panel Gain Adjustment

ADA-21

Doc. No. – 14466 Page 2 of 3

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Sigma ADA-21S instruction manual Audio Configurations, Front Panel
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ADA-21S specifications

The Sigma ADA-21S is an advanced digital audio device that has gained acclaim for its sophisticated features, robust performance, and user-friendly interface. Designed primarily for audiophiles and professionals alike, the ADA-21S combines state-of-the-art technology with functionality, making it a standout choice in the digital audio landscape.

One of the key features of the Sigma ADA-21S is its high-resolution audio playback capability. Supporting audio formats up to 32-bit/768kHz and DSD256, the ADA-21S ensures users can enjoy music with exceptional clarity and detail. This high sampling rate allows for a more immersive listening experience, where every note and nuance is captured, making it a perfect device for critical listening and professional audio work.

Incorporating advanced digital signal processing (DSP) technology, the ADA-21S allows for unparalleled audio manipulation. Users can apply various filters and effects, achieving precisely the sound they desire. The device also includes multiple input options such as USB, optical, and coaxial, making it versatile and compatible with a range of audio devices. The seamless connectivity options ensure that users can easily integrate the ADA-21S into their existing audio systems without any hassle.

The Sigma ADA-21S also features a sophisticated built-in headphone amplifier, providing audiophile-grade sound directly to headphones. This ensures that listeners can experience high-quality sound even when using portable devices. Moreover, its balanced output delivers superior audio performance with reduced noise and improved fidelity, enhancing the overall listening experience.

Another notable characteristic of the ADA-21S is its high-quality build. Featuring a robust chassis, the device is designed to minimize interference and provide durability. The sleek design also includes a user-friendly interface, complete with an intuitive screen that simplifies navigation through various settings and audio formats.

Additionally, the Sigma ADA-21S supports various file types, including FLAC, WAV, MP3, and AAC, making it a versatile choice for users with diverse audio libraries. The device’s ability to process and play these formats effortlessly contributes to its reputation as a reliable digital audio solution.

In summary, the Sigma ADA-21S stands out as a premier digital audio device, offering high-resolution playback, advanced signal processing capabilities, versatile connectivity options, and exceptional build quality. It caters to both casual listeners and audio professionals, ensuring a rich and detailed listening experience across a wide range of audio formats. Whether used in a home setup or as a portable solution, the ADA-21S is an impressive tool for anyone serious about their audio experience.
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