Perhaps your AVR has insufficient buffering to ensure a smooth clocking out of the LPCM bitstream it receives via HDMI. Perhaps it is over-aggressive in trying to match the incoming clock rate, resulting in cyclical overflow and emptying of the buffer.
I'd have thought though that a modern AVR would have no difficulty in ensuring it processes the incoming bits at a steady rate. The specification for the accuracy for the clocking out of HDMI audio packets from a Blu-ray player is quite tight. It should not be difficult for the AVR to find the incoming clock rate and keep to that rate with slow minor adjustments for drift, using an adequate sized buffer, and well designed clock rate control algorithms, thereby fully neutralizing any incoming jitter. I do mean "fully". No error in decoding the bits. And clocking out these 100% accurate bits smoothly and steadily so as to avoid any jitter being generated by the AVR itself.
Item: Primare SP31 (black) Location: Canberra Price: $850 + postage Item Condition: VGC Reason for selling: Not being used. Decided to skew setup to home theatre use and have reverted to two systems, so have purchased a processor for ATMOS and room correction. Payment Method: Bank transfer or cash preferred Extra Info: I have owned since new. It has actually had limited HT use (note, it is not a HDMI model). For critical music use, using either digital or analogue inputs, it is quite accomplished.
There are 16 assignable inputs (8 digital and 8 analogue). From the maker "Proprietary Processing - The SP31uses proprietary DSP circuitry developed by Primare, to provide a far more convincing multi-channel sound stage than the standard off-the-shelf circuits used in many other surround processors. It provides up to 192kHz/24 bit processing to accommodate all the current multi-channel audio formats. Audiophile circuit design - The main engine is the Crystal CS493200-series DSP processor together with four high performance 24bit/192kHz Burr-Brown PCM1738 DACs. Operational amplifiers NE5532 from Philips and Burr-Brown OPA2134 are used for the current to voltage conversion. Level control is carried out by four Burr-Brown PGA2311 (an improved version of the famous Crystal CS3310) and the final amplifier stage consists of Analogue Devices AD845 for the important front and centre channels. The remaining channels use Burr-Brown OPA2134 and all the output stages use precise DC-servo controls, instead of the use of output capacitors. DC-servo circuits have only moderate effect on sonic performance compared to capacitors. The video design uses an Analogue Devices AD8111 with incorporates 160MHz bandwidth for composite and S-video switching. On-screen displays are generated by the advanced analogue OSD-generator STV5730 from ST Microelectronics. High bandwidth component switching is carried out by Analogue Devices AD8075, which actually performs much better than normal analogue relays. Shortest signal paths - 1% Melf resistors are used in critical positions for their excellent sonically performance and possibility to provide short signal paths, a key element in high performance audio designs."
The unit is in very good condition. In the interests of full disclosure, it has very light swirl-scratching on the glass face (though you would need to look very closely) and two light scratches above the control knobs (again, not really obvious unless you look for them - in fact, I am having trouble photographing to show them). The unit weight (without packaging) is 10kg. I have the original shipping boxes. I also have the remote, however it doesn't work (whether it's the remote or the IR receiver I don't know).