SP395 SoundPro Audio Integrator
Form7492
Operation Manual
19
The left (L) input should be considered as the main channel input when using the Audio
Integrator. Some test functions, such as the cable test and audio stethoscope, only use one input.
In these cases you always use the left (L) input connector when performing the test.
Be aware that the different test functions of the Audio Integrator are setup for a mic. Level input
and others for a line level input. In each case, the input signal is taken from the left and right
input jacks. For the acoustics test functions, a microphone is normally connected, and for the
TechBench tests, a line level (or lower) electrical audio signal is anticipated by the SP395.
The acoustics functions, which expect input from a microphone, use the microphone SPL
calibration that is stored in the Utilities Calibration section. Electrical functions, which expect
their input from a line level source, use the dBu calibration. Keep this in mind to prevent
potential confusion over measurement results. For example, if a 0 dBu electrical signal is
plugged into the Sound Level Meter, you may see results like +150 dB SPL, depending on the
sensitivity calibration that is stored. Conversely, if you are using a microphone with the
Amplitude Sweep function, you will see very low results, perhaps in the –70 to –60 dBu range.
Audio Outputs
The Audio Integrator provides 3 output jacks for connecting analog audio output to sound
systems. You may use either the XLR, 1/4” TRS, or RCA phono jack. These jacks are located on
the left hand side of the instrument. All carry the same signal. The output range of the Audio
Integrator is approximately -72 dBu to +17 dBu.
The left side panel contains three analog audio outputs including an XLR, ¼ TRS headphone mono, and
unbalanced RCA phono jack.
Use the XLR male output jack when a balanced XLR audio output is needed. The ¼ inch TRS
headphone jack output is available when this connection is desired. This connector is wired in
parallel with the XLR output jack. It provides a TRS (tip, ring, sleeve) balanced audio output.
One side of the balanced output is routed to the RCA phono to form an unbalanced output. Use
this jack when you desire connection to an RCA connection cable.
Audio Monitoring Output
The Audio Integrator provides a headphone output jack for monitoring output audio. It is a stereo
output headphone jack with the purpose of simultaneously monitoring both a right and left audio
channel. The stereo headphone jack powers 32 ohm or grater headphones. The headphone jack
can also serve as a line level output if needed.
A speaker is built into the Audio Integrator for the purpose of monitoring the output audio. The
speaker is located on the left side panel of the instrument. The internal speaker outputs the mixed
left and right outputs taken from the headphone output.
