Finally some concrete details from the factory on these amps https://goodwinshighend.com/spectral-ind-pages/spectral-dma-500sv/
3) What are the objectives for the DMA-500SV?
The DMA-500 Anniversary Reference has proven the performance advantages of Spectral's SV high-speed technology. In the DMA-500AR proprietary FET devices in custom silicon were developed exclusively for our circuit application in a collaboration with Spectral engineers. The original limited device run for the DMA-500AR proved entirely successful, leading to expanded custom production for Spectral today. The first application for these ultra-high performance devices is in the production DMA-500SV monaural amplifier.
4) What are the breakthroughs in the DMA-500SV?
The fundamental advantages of the original DMA-500AR are further enhanced and focused in the production DMA-500SV. Spectral engineers developed the first high-speed, wideband audio amplifier circuits for music reproduction 40 years ago. These circuits addressed important time domain and transient distortions in amplifier design for the very first time. Today, the DMA-500SV represents the pinnacle of our high-speed, high-resolution technology with the fastest signal response and the lowest time-based distortion in the audio industry. The DMA-500SV builds on the legacy of the DMA-500 Anniversary with further refinemetns in passive signal components and improved power supply capacity and performance. The Teflon revolution bgan with the DMA-500AR and continues with the DMA-500SV. Our Teflon Array Technology (TAT) introduced in the 500 driver, is further imporved in the DMA-500SV. Proprietary Teflon trimmers also replace conductive plastic parts in critical output bias circuits, lowering transient settlling distortion to the lowest levels yet achieved. The DMA-500AR has proven the remarkable stability and robustness of the SV gain and output sections. With this confidence Spectral engineers have redesigned the DMA-500SV power supply and "opened it up" for increased performance. New transformer designs deliver improved regulation and higher peak current capability to fully realize the absolute potential of the DMA-500 topology.
5) Does the DMA-500SV share components with the DMA-500AR?
Although the DMA-500 AR and the DMA-500SV share common chassis designs and general layout, the DMA-500SV features various recently available new components as well as unique power supplies and support metalwork. Input, gain and ouput devices are individually matched by hand on advanced curve-tracing equipment before selected parts are soldered into the curcuit position on the amplifer boards of the DMA-500SV.