O.K, here are the results for the first batch of audio interfaces on the new round of testing.
Explanation of how the LLP- Low Latency Performance Rating is derived.
The results for the DAWbench DSP RXC across the latencies of 032 thru to 256 ( which has been the M.O for the last 5 years ) are added and the total is then % wise gauged against the result for the RME HDSPe AIO baseline card. The same is then calculated for the DAWbench VI CV/ NCV tests for 032-512.
Those 3 % results are then added and divided by 3 to give an average % .
I thought it important for the I/O and RTL figures to be an influencing factor on the rating as some cards have a lot lower overall latency than others, so the average % results is then multiplied by the last % result for the RTL.
How the RTL % is calculated is I combine the total of the RTL's across the specific available buffer settings for the cards ( all cards past the base reference RME were calculated using 064-512 except the M-Audio FastTrack which had a range of 128-512. You will notice 2 values listed for RTL for the RME HDSPe AIO , first being for 032-512, second being 064-512 ) , and then calculate the % variable against the baseline. You will see that some cards are actually better than the RME AIO card in regards to I/O /RTL i.e RME Babyface and the AVID MboxPro 3.
I think that is a fair appraisal using the collated data, and it gives deserved credit and advantage to those cards that do have lower individual In/Out and Round Trip Latencies.
Some cards do not report the correct I/O values to the DAW Hosts , only reporting the nominal value for the respective buffer sizes. In those instances I will make a note and default the RTL rating to .95 which is below the average of the other cards RTL % rating of around .97 , not perfect but a reasonable compromise.
A few side notes - the baseline reference is the RME HDSPe AIO card using the 3.08.5 driver. You will notice that even the new version 3.24 driver is also tested and gauged against that baseline result as the performance has dropped. If a later RME HDSPe driver levels or betters the 3.08.5 driver, then it will become the new baseline, unless of course another card has better overall performance and becomes the new baseline.
The performance of the M-Audio Fast Track Ultra was actually quite good for a USB2 interface at the available latencies, but its rating suffered due to the lowest available buffer being only 128. The results for the RME Babyface was very impressive for a USB 2 interface , edging out the FW - Profire 610 in the rating due to its lower overall I/O and RTL. The Result for the Focusrite unit using the dreaded Dice II FW controller , speaks for itself !
More results and analysis coming in the next few weeks
Original text edited at vin's request by MW