Manual Lynx E22 (page 44 of 56) (English)

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8.2.2.2 Controlling Latency by Changing the Buffer Size

Latency in an audio interface can be defined as the time required to process a sample from an

application to the interface’s audio output. A number of factors determine the achievable

latency performance of an E22/E44 system: processor speed, operating system, sample rate,

number of utilized record or play channels, system efficiency, etc.

Latency can be manipulated by changing the size of the buffers used to transfer data to and

from the card. Core Audio buffer size controls are offered within most pro audio recording

applications. With the E22/E44, buffer sizes typically range between 32 and 2048 samples.

Smaller buffer sizes will give you lower latency. However, if a buffer size is too small for the

system or context, audio anomalies such as clicks and pops may occur. It is recommended to

become familiar with altering the Lynx buffer size to best suit the context of use.

Once you determine the lowest achievable buffer size, you will typically have to double the

size each time you double the sample rate, but the effective latency will remain constant. For

example, if a system is capable of operating at a buffer size of 128 samples at 48 kHz, then

for a 96 kHz project, the buffer size will likely need to be increased to 256 samples.

8.3 Onboard Variable Trim Pots

The E22/E44 cards have Trim pots right on the circuit board, for calibrating the analog I/O to

match the trim settings of external gear, or to set the card to a studio reference other than the

factory default of 20dBu. The trim pots are located behind the 25-pin D-Sub port on the

component side of the board, and provide the ability to independently adjust trim the level of

all analog input and analog output channels continuously over a wide range. The trim level of

each channel is controlled by a 25-turn trim pot which provides a range of +8.5 dBu to +24

dBu full-scale (4 to 20 dB headroom above a +4 dBu nominal level).

The trim pots are accessed by removing the side of the computer. Access will vary by

motherboard location and chassis design. The pots are staggered for access. Use a very small

flathead screwdriver, and insert at an angle for easiest access.

The location of the trim pots for each channel is shown in the image below.

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Lynx E22 Manual

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