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Possible Cause 3: Some accelerated graphics cards use excessive
amounts of system bandwidth, preventing the recording buffer of an audio card
from keeping up with demand. This can cause clicks in the recording. Reducing
or turning off the graphics card’s graphics acceleration feature often resolves
this problem. In Windows, the level of graphics acceleration is accessed from
Start |Settings | Control Panel | System | Performance | Graphics.
Problem: The sound from the monitor mixer is muffled. It sounds as if it
were running through a mixer with the treble control turned all the way down!
Possible Cause: The current Delta 44 sample rate is too low. The
monitor mixer is a digital device that runs at the current sample rate of the
Delta 44 board. The frequency response of the mixer is roughly one-half
of the sample rate. There is no way to prevent this lost frequency response
while playing back or recording at a low sample rate. However, it may be
prevented when the system is idle. See the “CODEC SAMPLE RATE”
paragraph of the section ‘Hardware Settings Page’ for more information.
Appendix A - Technical Specs
Analog Audio
Peak Analog Input Signal: +14dBu (+4dBu setting),
+6dBV (Consumer setting),
0dBV (-10dBV setting).
Peak Analog Output Signal: +14dBu (+4dBu setting),
+6dBV (Consumer setting).
0dBV (-10dBV setting)
Measured Dynamic Range:
Outputs: 103dB (a-weighted),
Inputs: 99dB (a-weighted)
Measured THD (at 0dBFS):
Outputs: less than 0.0015%,
Inputs: less than 0.0024%
Measured Frequency Response: 22Hz - 22kHz, -0.3,-0.2dB
Input Impedance: 10k ohms minimum
Input Connectors: 1/4” female TRS-type, balanced or unbalanced
Output Connectors: 1/4” female TRS-type, balanced or unbalanced
Adapter Resource Requirements
IRQ: One required
I/O Addresses: Four blocks: 32, 16, 16, and 64 bytes
DMA Channels: None required
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