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soundBlade as well as some additional functionality, surround monitoring in 4.1, 5.1 and 7.1
formats and the creation of multiple headphone mixes using the included Sonic Console appli-
cation.
When you connect a 1/4” plug to a Series 300 jack, insert it straight and firmly, ensuring that
the plug is fully inserted into the jack. If the plug is not fully inserted you will get level shifts,
phase flips, distortion, or no sound.
2.2.3 Telescoping Shield Cable for Instruments
If you want to use the analog inputs with TRS–equipped devices, you may need an XLR to 1/4”
TRS balanced plug adapter cable. These are available commercially, or you can construct one
easily. The connections are Tip to Pin 2, Ring to Pin 3 and Sleeve to Pin 1.
2.2.4 XLR to Balanced TRS Cable
On output, if you are driving an unbalanced load, you will get the best performance by not
connecting the ring of TRS jacks to ground. In order to do this, you can simply use a balanced
TRS/TRS connector with the unbalanced gear. You can also construct a special cable with a TRS
connector and a TS connector. In this cable, you just let the ring of the TRS connector float.
Alternatively, the TS connector can be replaced with an RCA connector for interfacing with
gear that has RCA unbalanced interconnects.
2.3 SRC
Normally, when working with digital audio transport, you must take care to ensure that all de-
vices communicating with one another are synchronized to the same audio clock. While this is
still an important consideration with the Series 300, the hardware provides a special feature to
simplify copper-based digital connections to the box. The Series 300 digital inputs have an op-
tional asynchronous sample rate converter (SRC) that will automatically match the sample rate
of the incoming audio to the sample rate of the hardware. This converter is enabled by default
and you should disable it in the System section of the Sonic Console. If you have synchronized
the Series 300 to the external source, using any of the extensive synchronization methods pro-
vided, you will generally want to disable the SRC in order to get 24 bit transparent transport via
the digital inputs.
2.4 Clock Sync
Clock sync is a serious consideration in any digital audio system. If you are recording analog
sources with your Series 300, you can simply use the unit’s high-quality internal clock source to
drive the converters. This is the easiest method.
If you need to interface with other devices digitally or ensure sample accurate sync with video
sources, the extensive clock synchronization capabilities will prove to be more reliable and bet-
ter sounding than most higher priced alternatives.
There are three different ways to get external clock information into the unit:
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