LAB12 DAC1 Reference NOS Tube DAC

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LAB12 DAC1 Reference NOS Tube DAC at Vinyl Sound Buffalo NY The DAC1 Reference is a non-oversampling tube digital-to-analog converter from LAB12 (Athens, Greece), available at Viny l Sound in Buffalo, NY. At its core, eight multibit Philips TDA1543 DAC chips operate in a parallel network fed by an efficient digital receiver stage, with two dual triode 6922 tubes in the analog output stage handling current-to-voltage conversion. Supporting input sampling rates up to 24-bit/192 kHz across four digital inputs, and built on six separate regulated power supplies with a toroidal transformer, the DAC1 Reference represents LAB12's most refined effort to capture the organic, natural quality of analog playback from a digital source. The DAC1 Reference has earned the Outstanding Product Award from Hifi Pig, with reviewer Stuart Smith stating he considered creating a new award category for it. Non-Oversampling Architecture and Multibit Philips DAC Network The DAC1 Reference is built around a non-oversampling (NOS) design philosophy, eschewing the digital filtering and upsampling that characterize the majority of contemporary DACs in favor of a direct, minimally processed path from digital data to analog signal. Eight Philips TDA1543 multibit DAC chips are connected in a complex parallel configuration, a topology that reduces quantization noise through statistical averaging across the chip array while preserving the tonal character that has made the TDA1543 a revered component among NOS DAC enthusiasts. The digital receiver stage that precedes the DAC chip network is optimized for jitter reduction, ensuring that the timing accuracy of the digital data stream is maintained before conversion. The result is a converter whose measured output is deliberately modest by the standards of oversampling DACs but whose sonic presentation, particularly in the midrange and high frequencies, consistently draws comparisons to the best analog sources. Tube Output Stage and Six Regulated Power Supplies After digital-to-analog conversion by the Philips multibit network, the analog signal is processed by a tube-based output stage using two 6922 dual triodes for current-to-voltage conversion, a topology that retains the tonal density and dimensional quality of the NOS conversion without introducing the analytical character of solid-state I/V stages. Six separate regulated power supplies, each dedicated to a specific stage of the circuit, eliminate the cross-contamination that occurs in shared power supply architectures and allow each stage to operate at its optimal operating point. SRSG grounding and Fine Symmetry layout are applied throughout, maintaining channel separation and minimizing noise contributions. Analog Nissei VU meters on the front panel provide a characteristic visual signature that complements the DAC's analog-first design philosophy. Key Features NOS Non-Oversampling Architecture: A purely non-oversampling design path preserves the original digital data without the phase anomalies and pre-ringing artifacts introduced by digital filtering in oversampling converters. 8x Philips TDA1543 Multibit DAC Network: Eight TDA1543 chips in parallel reduce quantization noise while preserving the characteristic tonal warmth of the multibit Philips chip design. Tube I/V Output Stage: Two 6922 dual triode tubes handle current-to-voltage conversion in the analog output stage, adding tonal body and dimensional quality to the conversion result. 6 Separate Regulated Power Supplies: Individual regulated supplies for each circuit stage prevent noise cross-contamination and allow each stage to operate optimally. 24-bit / 192 kHz Input Support: Accepts PCM digital signals up to 24-bit/192 kHz across USB 2.0, two coaxial S/PDIF, and optical Toslink inputs. Toroidal Power Transformer: A dedicated toroidal transformer provides the clean, stable primary power supply the circuit demands. SRSG Grounding: Separate Rails Separate Grounds implementation maintains full isolation between signal and power ground paths. Fine Symmetry Layout: Precision circuit geometry ensures matched performance between channels. Analog Nissei VU Meters: Classic front-panel VU meters for real-time output level monitoring. Balanced and Unbalanced Outputs: Both RCA and XLR outputs are provided for maximum system flexibility. Technical Specifications DAC Architecture Non-oversampling, 8 x Philips TDA1543 multibit in parallel Input Sampling Rate Up to 24-bit / 192 kHz Digital Inputs 2 x S/PDIF coaxial (RCA), 1 x USB 2.0, 1 x S/PDIF optical (Toslink) Analog Outputs 2 x RCA, 2 x XLR (unbalanced; balanced version available) Frequency Response 20 Hz – 20 kHz (+0 / –1 dB) THD Below 0.15% Rated Output Level 2.5 V RMS Tube Complement 2 x 6922 dual triodes Power Consumption 70 VA max Available Colors Matte Black, Frozen Silver Dimensions (W x H x D) 43 x 11 x 29 cm Weight 7.5 kg Guarantee 5 years Connections at a Glance 2 x S/PDIF coaxial input (RCA) 1 x USB 2.0 input 1 x S/PDIF optical input (Toslink) 2 x stereo line output (RCA) 2 x stereo line output (XLR) Awards and Critical Recognition Outstanding Product Award – Hifi Pig Frequently Asked Questions What is the LAB12 DAC1 Reference? The LAB12 DAC1 Reference is a non-oversampling tube DAC from Athens, Greece, built around eight parallel Philips TDA1543 multibit chips and a tube-based 6922 I/V output stage. It accepts digital signals up to 24-bit/192 kHz via two coaxial, one USB, and one optical input, outputs to both RCA and XLR, and runs from six separate regulated power supplies and a toroidal transformer, targeting the closest possible approach to analog playback from digital sources. How does the DAC1 Reference compare to the Denafrips Ares II? The LAB12 DAC1 Reference and the Denafrips Ares II are both R2R-type multibit DACs that prioritize a natural, analog-adjacent sonic presentation over the measurement-focused approach of delta-sigma designs. The Denafrips Ares II uses a ladder resistor network in oversampling and NOS modes, delivers a wider selection of digital inputs including I2S, and measures with lower noise and distortion. The LAB12 DAC1 Reference uses Philips TDA1543 chips in a fixed NOS configuration, adds a tube-based analog output stage, and focuses on the specific tonal character of the TDA1543 chip as the sonic foundation. Listeners who value the tube output stage's contribution to midrange density and tonal warmth, and who are comfortable with a more purist input selection, will find the DAC1 Reference the more distinctive and characterful choice. What is non-oversampling DAC design and why does it matter? A non-oversampling (NOS) DAC converts the digital audio data stream to analog at its native sampling rate, without first multiplying the sample rate using digital interpolation filters. Conventional oversampling DACs increase the sample rate by factors of 8x to 512x before conversion, which simplifies the analog reconstruction filter but introduces pre-ringing and phase shift artifacts from the digital filter itself. A NOS design eliminates those filter-related artifacts entirely, resulting in a time-domain accurate analog signal whose aliasing components fall above the audible range and are removed by a simple analog low-pass filter. The audible result, in a well-implemented NOS design such as the DAC1 Reference, is typically described as more natural, less edgy, and more dimensionally coherent, particularly in the midrange and high frequencies where digital filter artifacts are most perceptible. Does the DAC1 Reference support DSD or MQA? No. The LAB12 DAC1 Reference is designed exclusively for PCM digital audio up to 24-bit/192 kHz and does not support DSD or MQA decoding. This is a deliberate design decision consistent with LAB12's commitment to the non-oversampling Philips TDA1543 chip architecture, which was designed for PCM playback. Listeners whose digital libraries consist primarily of high-resolution PCM files, CD-standard 16-bit/44.1 kHz, or streaming services delivering 16-bit or 24-bit PCM will find the DAC1 Reference fully compatible with their sources. Can the DAC1 Reference be connected to a computer via USB? Yes. The DAC1 Reference includes a USB 2.0 input alongside its two coaxial S/PDIF and one optical Toslink inputs, making it compatible with PC and Mac-based audio playback using standard USB audio drivers. The USB input supports PCM up to the converter's 24-bit/192 kHz maximum. For optimal results, using a dedicated USB audio interface or a linear-regulated USB power supply upstream of the DAC1 Reference is recommended to minimize the impact of computer-generated USB noise on the analog output stage. Where can I buy the LAB12 DAC1 Reference in Buffalo, NY? The LAB12 DAC1 Reference is available at Vinyl Sound in Buffalo, NY, an authorized LAB12 dealer serving Western New York and the USA. Vinyl Sound carries the complete LAB12 digital and analog lineup and can assist with system integration, source selection, and finish choice between Matte Black and Frozen Silver. Show more