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Perpetual Technologies P-1A D/D & P-3A D/A processors ...
https://www.stereophile.com/digitalprocessors/455
The P-1A has S/PDIF, AES/EBU, and I 2 S inputs (no TosLink); each input can accept a different combination of sampling rate and bit density. The input receiver is a CS8420, same as in the P-3A. However, unlike the P-3A, the P-1A uses only the CS8420's sample-rate conversion (upsampling) function, bypassing its built-in dithering capability.
Perpetual Technologies P-1A D/D & P-3A D/A processors ...
https://www.stereophile.com/content/perpetual-technologies-p-1a-dd-p-3a-da-processors-upgrades
Audio Alchemy's early digital processors were notorious for this, and the same seems to be true of the Perpetual Technologies products. The P-3A's power supply is just a small transformer in a box; the P-1A has a switching power supply, a type that's prone to be noisy unless it's very sophisticated—which this one isn't.
Product Review - Perpetual Technologies P-1A Digital ...
https://www.allegrosound.com/Perpetual_P1A_AllegroSound.pdf
P-3A Front Panel The front panel is virtually identical to the 1A. In fact, the only differences from the two are the stenciled name and that the input and program buttons are reversed. The front panel has two buttons, one on the top, which is used to program the 3A, and one on the bottom, which is used to select the input.
Product Review - Perpetual Technologies P-1A Digital ...
https://hometheaterhifi.com/volume_7_3/perpetual-technologies-p1a-p3a-9-2000.html
P-1A and P-3A are PT's first products, and we have to say, "WOW!" They upsample, enhance, and adjust for your speakers' as well as your room's deficiencies, then decode, all at leading edge levels. P-1A Front Panel The front panel has two buttons, one on the top, which is the input selection, and one on the bottom, which is used to program the
Perpetual Technologies P-1A Digital Correction Engine & P ...
http://www.stereotimes.com/acc011601.shtml
The P-3A is an upsampling digital to analog converter featuring the Crystal Semiconductors CS8420 input receiver (same as the P-1A) and CS4397 "Super DAC" chipset. The unit will accept all datastreams up to 24-bit/96kHz, and upsample all inputs to 96kHz.
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