Prism Dream AD-2

The Prism Sound Dream AD-2 is the definitive music A/D converter, providing the most accurate rendition of an audio event whether it be early music, classical, jazz, big band, a club mix or hard rock. The AD-2 conversion system provides an audio stream of such exceptional quality that it will be relied upon for years to come as the definitive source for productions on CD, DVD, Super Audio CD or other formats as they become available. It offers a wealth of sophisticated features as well as high-performance, multi-rate A/D conversion for the most exacting applications in sound recording, mastering and broadcast.

Performance
Converter performance is pushed ever-nearer the limit: Dynamic range reaches a massive 130dB, THD+n at full scale is raised to 108dB (0.0005%). Clock stability, and rejection of incoming reference jitter are also improved.

Flexibility
The AD-2 is like two separate A/D converters, plus a digital processor, all in one: it can generate two entirely separate output signals simultaneously. These can have different sampling rates, different word-lengths - even use different noise-shapers. For example, you can output a 96kHz / 24-bit signal and a 44.1kHz / 16-bit noise-shaped signal at the same time.

Apart from its breathtaking performance, the analogue front-end of the AD-2 includes many new features: Analogue input sensitivity (and inter-channel balance) is software-programmable over the entire range with 0.05dB resolution. Just as with the AD-1, the inputs are transformerless, electronically balanced and galvanically isolated (fully floating), to ensure freedom from noise pick-up and crosstalk.

Digital to Digital Sample Rate Conversion
The 'D-D' (digital-to-digital) path, first provided in the AD-1, has been improved still further in the AD-2: It still offers re-dithering, noise-shaping and DRE encoding / decoding, but now it has synchronous sample-rate-conversion (SRC) as well. So you can re-process your 96kHz, 24-bit masters to 44.1kHz 16-bit streams for CD, or you can up-sample low-rate recordings for post-processing at a higher rate... in fact, you can convert between any two standard sampling-rates - synchronously. Synchronous sample-rate-conversion, if correctly performed, is free of the distortion artifacts associated with conventional 'variable-rate' SRCs.

Noise Shaping
The four tried and tested Super-Noise-Shaping ('SNS') curves are extended to include optimal shaping for the higher sampling rates. The SNS process gives greatly-improved small-signal performance for limited word-lengths, such as CD, and is completely compatible with existing D/A converter products (including consumer and professional CD players).

The Last Word
We've been very busy since our first generation converters came out in 1994. Take a long look at the AD-2 and DA-2 and you'll see why. We have compromised on nothing: these converters quite simply redefine the state-of-the-art.