Fosi Audio Products


FOSi Audio is our latest partner for high end audio products to play digital music. We have partnered with them for digital sound reproduction with their latest amplifiers and digital to analog converters ( DAC ).

We are pleased to make these offerings new for 2025.

These are absolutely one of the finest audio equipment we have found at such a modular form factor and sound quality at an affordable price. They will look sleek in your home or office where friends and colleagues alike will ask you where did you get that cool looking piece of audio gear.

You can answer with “at Madison Digital Audio”.

FOSI Audio is under our Madison Digital Audio brand. We have two of their products in-house and available to listen. We like the crystal sound quality and live stage delivery that is provided from different digital music sources. When paired with a digital audio player (DAP), Bluetooth streaming or a our MediaKat system, music and the live stage comes alive. We have even paired this with our Neo-I gaming platform .


FOSI Audio’s ZA3 Amplifier

Balanced Stereo Amplifier Home Audio 2CH Mono Amp with TPA3255 Chip

Simple and elegant is this 2-channel stereo amplifier.

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The ZA3 Amp from Fosi Audio provides hours of enjoyment from all your digital music collections. One unit can be configured in stereo or in a mono configurations. The unit can stand by itself and connect to a set of speakers.

Cool to the touch and always on-demand for your music experience, the Fosi Audio ZA3 is a winner of a product. A must have for that next office party, dining room ambiance sound, or on the patio terrace for a weekend get together with friends.

We like to pair two of these amplifiers in mono configuration for the right and left channel respectfully. We front end the amplifier with the Fosi Audio ZD3 Fully Balanced Desktop DAC for the ultimate setup. Sound quality is amazing in this small modular package. You will not be disappointed.

Amplifying Your Voice, Shaping Our Innovation

At Fosi Audio, behind every one of their innovations there’s a story. The birth of the ZA3 amplifier is just such a story, centered around our users. After the launch of the V3 amplifier, we gathered innumerable feedback from passionate audiophiles. They expressed a desire for us to develop an even better amplifier based on V3.

If you would like to add additional sound coloring and persona to your branding of music, Fosi Audio is unique that they allow for you to use additional op-amps with your ZA3 unit to bring about more emphasis to your style of music. Now that is choice!

Personalize your audio experience with the op-amp rolling feature! The ZA3 stocks five swappable op-amps for left and right channel outputs, balanced input, and subwoofer output. Experiment with compatible DIP8 dual op-amps such as Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4558, LM4562, LME49720HA, etc. to fine-tune your sound to perfection.

Quick Specifications:

Input: RCA, XLR, ¼”TRS; Output: Stereo, Mono

SNR≥106dB; THD<0.006%; SINAD: 89dB; Frequency Response: 20Hz-20kHz (±0.1dB)

Rated Power Output: Stereo 180W*2 @4Ω; Mono 235W @4

Available Offerings from Madison digital music
  • Madison Digital Audio provides a single ZA3 amplifier for $149.00
  • Our Madison Digital Audio Premium Audiophile Bundle with two ZA3’s and one ZD3 Fully Balanced Desktop DAC is offered at $450.00
  • Our Ultimate Audiophile Bundle with the Premium Bundle Plus Speakers and MediaKat is retailed at $1250.00.

Give us a call or contact us thru our site to schedule a listening session or ask more about our options.


Fosi Audio’s ZD3 Fully Balanced Desktop DAC

Looking for that ultimate digital audio preamplifier or standalone digital audio converter. This is product for you as part of your modern music reproduction platform in your home or office.

This is Fosi Audio’s Flagship Desktop DAC: A fully balanced digital-to-analog converter preamp with multiple inputs and outputs. Fosi Audio’s first DAC to support HDMI ARC input and comes equipped with a high-performance ES9039Q2M chip to deliver rich and superior sound.

Play your favorite rock, jazz or classical music and you will be amazed what is provided in such a small package. This DAC has it all, quality build components, rich sound, and beautiful modern industrial design. This is a very sleek form factor that fills your room with sound but not the counter or wall full of audio gear.

ZD3 is miniaturized in scale, but not on performance.

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Key Features

Premium Chipset: The ZD3 features the chipset consisting of XMOS XU316+ES9039Q2M+QCC3031+LME49720. It supports high audio resolution, with a maximum capability of DSD512 and PCM 32bit/768kHz sampling rates, providing unparalleled clarity and depth.

Versatile & Flexible: The ZD3 offers comprehensive connectivity, supporting inputs like Bluetooth, USB, OPT, COAX, HDMI ARC, and balanced XLR/RCA outputs. This flexibility allows you to customize your audio system to suit various setups and scenarios.

Ease of Use: The ZD3 adopts a 1.5-inch OLED display, remote control, preamp bypass switch, and 12V trigger in/out interfaces, allowing synchronized power on/off with other home audio devices, all for a good user experience.

Family Design: Featuring the same design language as the ZA3 amplifier: compact and exquisite appearance and audiophile-grade components for high performance and excellent sound quality. Pair it with the ZA3 to create a robust home audio system.

Important Note: When the ZD3 is used with an LG TV, a bug in the LG TV system may cause issues with the HDMI-CEC function. Specifically, after turning off the TV with the power button or remote control, both the TV and ZD3 may automatically power back on after a short time. If you are using an LG TV, we recommend disabling the HDMI-CEC function. We are working hard to resolve this issue and sincerely apologize for any inconvenience caused. Thank you for your understanding.

Specifications:
  • Chip Set: XMOS XU316 + ESS 9039Q2M + QCC3031 + LME49720
  • Maximum Sampling Rate:
    USB: PCM 32bit/768kHz; DSD512
    OPT/COAX: PCM 24bit/192kHz
    Bluetooth: PCM 24bit/48kHz
  • Output Level:
    XLR: 5Vrms RCA: 2.5Vrms
  • Input Mode:USB, HDMI (ARC), Coaxial, Optical, Bluetooth
  • Output Mode: XLR, RCA
  • SINAD: 126dB
  • THD: ≥120dB
  • THD+N: <0.00008%
  • Dynamic Range: ≥123dB
  • Noise Floor: ≤2μV
  • Bluetooth Version: 5.0
  • Bluetooth Connection Distance: ≥13m
  • Bluetooth Transmission Audio Format: aptX HD, aptX, AAC, SBC
  • Power Supply: DC 12V 1.5A
  • USB Compatible Devices: Windows 7, 8, 8.1, 10, 11 (Some require drivers; please refer to the user manual)Mac OS X, Linux (No driver required)
Available Offerings from Madison digital music
  • We offer the ZD3 Desktop DAC unit for $179.99.
  • Additional bundles for our Premium and Ultimate audio solutions are available when paired with the venerable ZA3 Amplifier.

Give us a call or contact us thru our site to schedule a listening or ask more about our options.

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