The Riven Audio SRP Digital

The SRP Digital is a unique product and will be manufactured in limited quantity. 20 pieces will be available in 2025. Any further manufacture will depend on interest and the economic viability at the time. Once available to order on September 10, 2025, they will be available on a first-come first-served basis until sold. They will be priced at $899, and I will not be taking 'holds'.

Like the SRP, the SRP Digital accepts two channels of input and provides three channels of output. Unlike the SRP, audio in and out is provided by S/PDIF over Toslink optical.

Since S/PDIF over Toslink is limited to two channels of uncompressed audio per connection, two optical outputs are provided. The internal data path is 32 bit floating point, and the output is 16 bits at 48Khz with a firmware update to 24 bits in the near future.

The requirement for two optical inputs to the system DSP significantly limits the available architectures for system design. In order to use the SRP Digital, you will require 2 optical input paths to your system DSP.

The only single system DSP capable of accepting and routing two optical inputs is the Audiotec Fischer BRAX DSP when configured with two stereo optical input modules. *See the update below!

Any other solution will require multiple individual DSPs. Thankfully there are a few manufacturers that are including full system DSPs in their amplifiers with Toslink optical inputs and outputs, so there are a few configurations available that retain an entirely optical signal path. None of them are simple or conservative.

A few such examples are shown below. Thoroughly consider your needs and map out all signal paths carefully before purchasing the SRP Digital.

For most system architectures the standard SRP is a better choice, using optical input or USB input and analog output.

The SRP Digital routes the left and right output signal to the Toslink connection labeled "L/R Out" and the C output to the Toslink connection labeled "C Out". The Center signal is found on both channels of that Toslink for symmetry. Do not use both channels of the C signal. Route either the Center signal on the right channel or the Center signal on the left channel in your system DSP. Do not sum both C signals together.

UPDATE!

With thanks to Benjamin, ATF has confirmed that the HEC Optical In and the onboard optical input can be used simultaneously on compatible Audiotec Fischer Helix processors. ATF has confirmed that you can run both inputs simultaneously if:

i) Routed through Main to Virtual

ii) No routing in Digital to Virtual and HEC/AUX to virtual

iii) HEC/ AUX and Digital Input Activation are set to off which basically then ignores the Priority check box

This information is believed to be correct, but please refer all related questions to Audiotec Fischer for any clarification.

Three Amplifier Solution

The DSP amplifier that receives the optical connection with the Left / Right signal pair must connect to the subwoofer amplifier. The subwoofer must be connected to the L+R sum signal to function properly.

Only the DSP amplifier that drives the center channels requires the center signal.

The SRP Digital sends the left and right signals on one optical output, and sends only the Center signal on the second optical output.

Just like the original SRP, the SRP Digital accepts audio over the USB connection directly.

Two Amplifier Solution

The subwoofer must have access to the L+R sum signal to function properly but the subwoofer is driven by a high-power channel on the center channel amplifier. Since the optical input of the center channel amplifier is already in use, a left and right analog output must send the L/R signal to the center channel amplifier to provide the necessary signals for the subwoofer.

Only the DSP amplifier that drives the center channels requires the center signal. This configuration provides digital signals to all channels except the subwoofer.

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