Rossini has various output levels up to 6 volts. The jump from 2 to 6 volts is significant. Is an intermediate output level of 4 volts, for example, planned or not in future software updates?
Thank you
Nick
Hi Nick,
The 2V and 6V output voltages actually use different output circuitry - we use a different circuit path on the output stage across 2V and 6V. As such, we can’t add 4V in the same way through an update.
That said, if you run the Rossini at 6V with the volume control set to -3.5dB, that is in essence a 4V output level.
Are you still running your Rossini into the Solution 727?
Hi James,
It’s connect to the preamp 727, which accepts up to 9 volts of input voltage, but that’s not the problem. The problem is the power amp Soulution 717, which, when playing low volume-recorded tracks and having to raise the volume on the preamp, displays a high-frequency error on some high-dynamic passages. It seems this could be due to the wide bandwidth that amplifies everything well above 20 kHz. I was just curious; I want the maximum dynamic range my Rossini Apex can provide, and I don’t want to lower its volume.
I use Map 1, Filter 1 and Dxd upsampling.
Nick
Hi Nick,
Thanks for the info, that’s good to know.
I don’t know what’s happening on the interplay between the 727 and 717, but it sounds like everything on your Rossini is set up properly. Map 1, Filter 1 and DXD Upsampling will have very good out of band performance. Is the issue worse / more common on particular sample rates?
Give Map 2 a try and see if there’s any change there.
Also I should note that lowering the Rossini volume control by 3.5dB will have absolutely no difference on performance - if it keeps the power amp from being driven into an uncomfortable place, it should definitely be kept lower. Unless something is very mismatched gain wise in the system, it is always better to have the volume control set to drive the connected amps more happily than to try and preserve resolution in the DAC.
This would also be the exact same operation that would happen if we implemented 4V in the firmware.
Totally fine to keep it at max volume if you’d rather, but it would be well worth trying the system at -3.5dB to see if that does solve the issue - little bit of troubleshooting might be helpful to figure out what’s happening and why.
James,
It seems that the Rossini output has a high amount of ultrasonic information, combined with the fact that the Soulution 717 has a bandwidth of 1 MHz, it sees this as an error and goes into high-frequency error. It only happens if the song is recorded with low volume, so I have to turn up the volume to listen to it at normal levels, and only then do I have the problem. The ultrasonic component on a low-recorded song is probably higher, and the power amp goes into protection mode. James, if I set the volume lower, the problem goes away. I just wanted to ask if you’ve heard of this with the Soulution 727/717. Perhaps Map 1 Filter 1 is more aggressive due to its construction, but that’s just my opinion, obviously. I don’t want to modify them; I keep the volume lower on some low-recorded songs.
Thanks.
Nick
James,
Are you mad…
Everyone knows the set volume control must be an even number, never odd and for gods sake, definitely not a point.something.
You’ve set me twitching just suggesting it.
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Hi Nick,
Interesting, I’ve not heard about that behaviour with dCS / Solution 727/717 but I shall do a little digging and see if anything comes to light. I would say that for the sake of learning a bit more about the issue, the next time it happens, give Map 2 a try on the same track at the same volume. I’m not suggesting you keep Map 2 in use outside of a bit of testing, but it does have a lower level of ultrasonic noise given the lower switching speed, which may help.
Given the analogue filter on the output is around 100 kHz, none of the settings should impact the problem, but if you get the opportunity to try Map 2 that would be quite informative. Other than that, leave your filter / Upsampling as is.
But if the volume is -4dB, the voltage is 3.785V… You can’t win!!
Thank you James,
i will try map2 and let you know
Nick
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