RME HDSP 9652 [27/75] Hotline troubleshooting

User's Guide HDSP System HDSP 9652 © RME

17. Hotline – Troubleshooting

17.1 General

The newest information can always be found on our website www.rme-audio.com, section FAQ,

Latest Additions.

The input signal cannot be monitored in real-time

• ASIO Direct Monitoring has not been enabled, and/or monitoring has been disabled globally

(for example in TotalMix).

The 8 ADAT channels don’t seem to work

• The optical output ADAT1 has been switched to 'SPDIF'. The ADAT playback devices are

still usable by routing and mixing them in TotalMix to other outputs.

Low Latency ASIO operation under Windows 2000/XP on single CPU systems:

• To use ASIO at lowest latencies under Windows 2000/XP even when only having one CPU,

the system performance has to be optimized for background tasks. Go to >Control Panel/

System/ Advanced/ Performance Options<. Change the default 'Applications' to 'Background

tasks'. The lowest usable latency will drop from 23 ms to around 3 ms.

Playback works, but record doesn’t

• Check that there is a valid signal at the input. If so, the current sample frequency is dis-

played in the Settings dialog.

• Check whether the HDSP system has been selected as recording device in the audio appli-

cation.

• Check whether the sample frequency set in the audio application (‘Recording properties’ or

similar) matches the input signal.

Crackle during record or playback

• Increase the number and size of buffers in the ‘Settings’ dialog or in the application.

• Try different cables (coaxial or optical) to rule out any defects here.

• Check that cables/devices have not been connected in a closed loop. If so, set the system’s

clock mode to ‘Master’.

• Increase the buffer size of the hard disk cache.

• Activate Busmaster mode for the hard disks.

• In case of a recently done BIOS update of the motherboard: Probably 'Load BIOS Defaults'

was loaded instead of 'Load Setup Defaults'. This sets the 'PCI Latency Timer' to 0 (default:

32).

ADAT timecode is running, but Cubase does not start 'Play' automatically

• The input displayed in ‘Sync Ref’ is not in sync mode. Sync mode is essential, because

ADAT’s so-called time code is really a sample position, and is therefore only valid for syn-

chronous audio data.

• Sync is displayed (referring to the card’s clock), but the incoming data is not in sync with the

sample position received at the ADAT Sync In. Then Cubase does not start. Remedy: Set

‘Pref. Sync Ref’ to the input corresponding to the received ADAT Sync signal.

• Sync mode wasn't activated (button in the transport panel), or ASIO 2.0 has not been chosen

as the SMPTE sync source.