SRS Labs SR550/552, Voltage Pre-amplifier manual FS Sensitivity SR552 Gain, High

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DYN RES

FS Sensitivity

SR552 Gain

LOW

> 50 mV

10

20 db

50 mV

20

 

20 mV

50

 

< 20 mV

100

NORM

> 5 mV

10

40 db

5 mV

20

 

2 mV

50

 

< 2 mV

100

HIGH

> 500 µV

10

60 db

500 µV

20

 

200 µV

50

 

< 200 µV

100

When the SR552 is connected, the full scale sensitivity can extend to 10 nV (no expand). The 10, 20, 50 nV sensitivities can be reached using the normal lock-in controls. If the SR552 is disconnected while the sensitivity is below 100 nV, the sensitivity will revert back to 100 nV.

From the computer interface, the presence of the SR552 can be determined using the 'H' command. Also, gain codes 1-3 are acceptable in the 'G' command to set sensitivities below 100 nV. Pre-amplifier overloads are not detectable via the computer interface.

USING THE SR552 WITH SRS DSP LOCK-INS The SR552 is not sensed by the DSP lock-ins. The DSP lock-in does NOT compensate for the gain of the preamp. The gain of the preamp is set to 10. Measurements made with the preamp need to be divided by 100.

The SR552 is AC coupled from 1 Hz to 100 kHz. Set the lock-in input to AC coupled since the signal must be above 1 Hz. Frequencies below 1 Hz will not be detected by the SR552.

COMMON MODE ADJUST

The common mode rejection of the SR552 is adjusted by the small screw on the right side of the enclosure. The CMR is set at the factory, however, it may be necessary to re-adjust it, particularly if there is one specific frequency which is important. The easiest way to peak the CMR is to use the internal oscillator of the lock- in (or any signal generator). Apply a reference signal to the lock-in REFERENCE INPUT. Apply a 100 mV signal to both the (A) and (B) inputs of the SR552. Check the SR552 connections by switching the input selector to

(A). The lock-in should read 100 mV (with the phase adjusted on the SR510). Now switch the SR552 to (A-B). Adjust the lock-in sensitivity to obtain a 50% output. Adjust the CMR screw on the SR552 to minimize the lock-in output. On the SR510, it is necessary to check the output when 90° of phase shift is added as well. On a

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Contents Model 02/65 SR550 Preamplifier Specifications Summary Operating Instructions FS Sensitivity SR550 Gain DYN RESPin Voltage Current SR550 Without a LOCK-INSRS part# Parts ListPC Layout Model SR552 SR552 Preamplifier Specifications Summary Noise Figure Contour Connecting the SR552 High FS Sensitivity SR552 GainSR552 without a lock-in PIN D REF. SRS part#33 4-00082-401 RU7A 4-00032-401 RU7B 4-00032-401 SW1

SR550/552, Voltage Pre-amplifier specifications

SRS Labs, a renowned leader in audio technology, has made significant strides in the realm of audio amplification with the Voltage Pre-amplifier models SR550 and SR552. These pre-amplifiers are designed to deliver exceptional performance and fidelity, appealing to both professional and home audio enthusiasts.

The SR550 and SR552 are equipped with a host of features that ensure high-quality sound reproduction. They utilize state-of-the-art components and engineering techniques to minimize distortion and maintain signal integrity. One of the defining characteristics of the SR series is their low noise performance. The pre-amplifiers are designed with precision circuitry that effectively reduces background noise, allowing for a cleaner audio signal that is crucial for critical listening applications.

A key feature of the SR550 and SR552 is their adjustable gain settings. This allows users to fine-tune the amplification levels to match different sources and listening environments. Whether you are connecting a low-output microphone or a high-level line source, the adjustable gain ensures optimal performance across various setups.

Both models also support a wide frequency response range, making them suitable for a variety of audio applications, from studio recordings to live sound reinforcement. The frequency response extends well beyond the human hearing range, which ensures that even the most subtle details in recordings are faithfully reproduced.

In terms of connectivity, the SR550 and SR552 offer a range of input and output options. Users can connect various audio sources through XLR and TRS inputs, while balanced outputs maintain the integrity of the audio signal during transmission. This versatility makes them ideal for integration into existing audio systems.

Another notable technology featured in the SR series is SRS Labs’ proprietary noise reduction technology. This feature actively reduces unwanted background noise without compromising the audio clarity, providing a more immersive listening experience.

Durability is another hallmark of the SR550 and SR552, with robust construction and high-quality materials designed to withstand the rigors of regular use in both studio and live environments.

In conclusion, the SRS Labs Voltage Pre-amplifiers SR550 and SR552 stand out in the market for their exceptional sound quality, innovative features, and reliable performance. Whether for critical studio editing or live audio applications, these pre-amplifiers are engineered to meet the needs of audiophiles and professionals alike, ensuring an unparalleled listening experience.
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