Technical information

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Additional technical information

Understanding input sensitivity in a digital preamplifier

There is no variation of sensitivity for digital inputs. The consumer SPDIF interface defines full-scale in terms of the digital word coming in.

In a conventional analogue preamplifier the input sensitivity is normally quoted as that level required to give rated output when the volume (i.e. gain) is turned full up. In 562 this figure is less important than the maximum input that can be fed to the preamplifier without distortion. This level is sometimes given for analogue preamps as the overload level.

For the analogue inputs of 562, the input sensitivity you select in Gain (see page Error! Bookmark not defined.) is the voltage at which the analogue–digital converter will overload. For some sources – e.g. Radio, Tape or Video this can be very closely defined and the nominal output of the source will be within 3dB of its maximum. For other sources – e.g. turntables, the maximum signal is less well defined and some experimentation may be beneficial. See the section following on ‘How to get the best out of LP’.

Clipping and overload

Input overload occurs for analogue signals that overdrive the analogue– digital converter. We have fitted a Level light to the front panel of 562. If you are close to overload on analogue sources this will flash. The threshold for this light is 3dB below clipping. Ideally you will use a combination of 562 input sensitivity and source output that is as much as possible consistent with this light never – or only very rarely – flashing. An obvious exception to the ‘never’ rule would be on interference signals like ignition noise on a tuner or bad scratches on a record.

How to get the best out of LP

The turntable source is quite unique in the problems it presents to getting optimum sound quality. Obviously the turntable itself must be correctly setup and we recommend you have your dealer check it from time-to- time.

562 has several adjustments that affect the sound quality of turntable sources. Here is a starting checklist.

1.Is the 562 installed far enough away from components which contain mains transformers to ensure that you get no hum induced?

2.Is your cartridge Moving-coil or Moving magnet. Ensure you have the right module fitted.

Pickup cartridges tend to have their output specified at 5cm/s recorded velocity. Normally the maximum velocity found on an LP is 25cm/sec at the outside and around 18cm/s in the inner grooves. 25cm/sec is about the maximum tracking ability of audiophile MC cartridges. Certain moving- magnet cartridges can track up to 35cm/sec but there are rarely these velocities to be found.

On the face of it we could adjust the LP input sensitivity to 5 times the rated output of the cartridge. If we do this then as expected the overload Level light very rarely illuminates. This kind of setting gives three benefits:

∙The maximum digital level for any recording.

562 User Guide

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Meridian America 562 Additional technical information, Understanding input sensitivity in a digital preamplifier
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562 specifications

Meridian America 562 is a state-of-the-art solution in the realm of high-performance audio systems, designed specifically for audiophiles and those who appreciate exceptional sound quality. A proud member of Meridian's esteemed lineup, the 562 embodies the company's commitment to delivering unparalleled audio experiences.

One of the standout features of the Meridian America 562 is its advanced digital signal processing (DSP) capabilities. The device utilizes proprietary DSP algorithms to optimize audio performance, ensuring that users experience sound that is not only clear and detailed but also well-balanced across all frequencies. This attention to detail makes the 562 particularly appealing for those who seek fidelity typically found only in high-end studio equipment.

The unit also incorporates Meridian's renowned Meridian Lossless Packing (MLP) technology. MLP compresses high-resolution audio files without sacrificing quality, allowing users to enjoy their favorite tracks in stunning detail while saving valuable storage space. This feature is especially beneficial in an era where high-resolution audio is increasingly popular.

Moreover, the Meridian America 562 boasts multiple connectivity options, including digital, analog, and network inputs, making it compatible with a wide array of audio sources. Whether you are streaming music from a digital library, connecting a CD player, or utilizing a high-definition television, the 562 ensures seamless integration into any sound system. Its robust networking capabilities also support various audio formats, catering to modern listening habits.

In terms of design, the 562 features an elegant and minimalist aesthetic that allows it to blend effortlessly with any home decor. The user interface is intuitive, making it easy to navigate through menus and settings, while the build quality reflects Meridian's dedication to crafting durable products.

Additionally, the Meridian America 562 is engineered for expandable functionality. With options for future upgrades and enhancements, the device can evolve alongside technological advancements in the audio industry. This foresight ensures that users can enjoy new features without the need to replace their entire system.

In summary, the Meridian America 562 stands out in the world of audio technology thanks to its superior DSP capabilities, MLP technology, diverse connectivity options, and expandable features. For anyone serious about sound quality, the 562 is an investment that promises a richly rewarding auditory experience.
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