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WEISS DAC501, Руководство пользователя

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Weiss Enginering Ltd.

DAC501-4ch/DAC502-4ch

2.3.7

Headphone EQ

Figure 9: Headphone EQ plugin

Fig. 9 shows the headphone EQ plugin. Select your headphones

Model

using the drop-down menu. Based

on your selection an associated photo of the current headphone model is displayed, click on it to show the
manufacturer’s product website.
In addition the frequency response of the corresponding headphone EQ will be plotted. The EQ setting is
designed by the manufacturer and tailored to optimize the sound of the headphone. These specified EQ
designs can not be altered by the user.

2.3.8

Loudness EQ

The loudness EQ visualized in figure 10 is based on the Equalizer patent of Bernhard Schwede

2

. The idea

behind this equalization is based on psychoacoustic grounds.
Mainly the psychoacoustic quantity

loudness

is eponymous and essential for the EQ design by Schwede.

In acoustics this loudness describes the subjective perception of sound pressure

1

. Schwedes EQ design

then considers this subjective perception to create a more pleasant playback regarding the sound intensity.
The specific design of Schwedes patent is implemented in the presented plugin.
Summing up this EQ offers you the possibility to influence playback volume in such a way that the resulting
loudness impression becomes more authentic throughout the audible frequency spectrum.
Choose your desired loudness

Level

via the drop-down menu. These ten different level settings in dB are

illustrated with comparisons benefiting an intuitive use of this plugin. Starting at the lowest level at 60 dB
you can increase the loudness up to 105 dB.

2

Patent specification: EP 3 123 471 B: Schwede, Bernhard ”Equalizer, audio system with such an equalizer and method

for equalizing a sound mix”.

https://data.epo.org/publication-server/pdf-document/EP15712869NWB1.pdf?PN=EP3123471%

20EP%203123471&iDocId=5586961&iepatch=.pdf

User Manual and

12

White Papers

Содержание DAC501

Страница 1: ...DAC501 4ch DAC502 4ch User Manual and White Papers Software Version 2 5 1r3001 Date February 15 2022...

Страница 2: ...ossfeed Headphone 14 2 3 12 Snapshot Storage 16 2 3 13 Global Presets 17 2 3 14 Firmware Update Download 18 2 3 15 M S Control 18 3 Technical Specification 19 4 Signal Processing Algorithms 24 4 1 The...

Страница 3: ...d headphone outputs are provided Weiss Engineering has a 30 year history in D A Converter design In that time span we have learned a thing or two about converter design The DAC50x 4ch is the essence o...

Страница 4: ...u which allows to select one of the DSP algorithms to be changed Note the rotary knob allows to scroll through the menus The algorithms can be operated via the touch screen but we recommend to use the...

Страница 5: ...e DSP Presets is given in the web interface description below Figure 3 IR remote control 2 3 The Web Interface As last but not least possibility to operate with your DAC50x 4ch we offer you the Web In...

Страница 6: ...Weiss Enginering Ltd DAC501 4ch DAC502 4ch Figure 4 Web interface overview User Manual and 4 White Papers...

Страница 7: ...r in the high frequency content of music So this plugin can be beneficial if your favourite recording contains some unpleasant harsh sounds But sharpness can also arise during mastering or as a result...

Страница 8: ...elected To switch a plugin on off just tap on the enable bypass tab The selection is highlighted in red By moving the slider you can adjust the user parameter Saturation The Saturation parameter adjus...

Страница 9: ...qualizer plugin A little example should give you an idea of the functionality and the manifold opportunities the EQ offers The 1st band is set to low shelving with a boost of 0 5dB at 147 Hz i e frequ...

Страница 10: ...s Consider the following instructions on how to set up the Room EQ with a simple procedure without using any measurement In an alternative setup scenario we will use the room measurement software of t...

Страница 11: ...ries you may visit this website and calculate the potential room mode frequencies by entering the dimensions of your listening room https amcoustics com tools amroc This can help with determining the...

Страница 12: ...roduction without boomed bass Note you may have gotten used to the acoustics of your playback setup and then when correcting it with the Room EQ it may sound strange at first But keep it and listen to...

Страница 13: ...31 132 105 42 32 130 106 41 33 128 107 41 34 126 108 40 35 124 109 40 36 122 110 39 37 120 111 38 38 118 112 38 39 117 113 37 40 115 114 37 41 113 115 36 42 111 116 36 43 109 117 35 44 108 118 34 45 1...

Страница 14: ...Schwede In acoustics this loudness describes the subjective perception of sound pressure1 Schwedes EQ design then considers this subjective perception to create a more pleasant playback regarding the...

Страница 15: ...rall the same loudness impression To adjust how strong this dynamic range reduction should affect the playback you can set the Dynamic Level If you want to have less dynamics left in the output choose...

Страница 16: ...peakers and Distance Listener faders If the geometry is not very well suited for the XTC playback the background of the two fader sections turns yellow The XTC may still work but may be compromised No...

Страница 17: ...Headphone plugin allows adjusting the Amount level between 0 and 100 in order to achieve your preferential setting A higher Amount results in stronger impact of the plugin s effect on the played back...

Страница 18: ...s also part of its setting and will be stored in the snapshot Figure 14 Snapshots maintenance In order to recall a stored snapshot select it by name from the list and tap on Snapshot Load Store a plug...

Страница 19: ...er DSP algorithms are bypassed The plugin sequence within the composer matrix reflects the actual sequence of the DSP processing Pre set snapshot dropdown lists of plugins which are currently not appl...

Страница 20: ...onnect to our Server to see whether there is any new device firmware available The DAC50x 4ch has to be connected via Ethernet to your internet router If new firmware is available the pad allows to do...

Страница 21: ...V or 200 240 V automatic voltage selection Fuse rating 500 mA slow blow Power consumption 25 VA max Power consumption in standby 2 2 VA max Size DAC501 4ch Depth 30 cm Width 18 8 cm Height 6 6 cm Heig...

Страница 22: ...puts None Analog Outputs 2 XLR connectors hot on pin 2 short circuit proof output circuitry DC coupled low output impedance 2 RCA connectors short circuit proof output circuitry DC coupled low output...

Страница 23: ...0 dB setting 8 1 Vrms 20 4 dBu 10 dB setting 2 55 Vrms 10 4 dBu 20 dB setting 0 81 Vrms 0 4 dBu 30 dB setting 0 255 Vrms 9 6 dBu As input a 0 dBFS sine wave signal was used These levels are achieved...

Страница 24: ...z 0 Hz 20 kHz within 0 25 dB Fs 88 2 kHz 0 Hz 40 kHz within 1 dB Fs 176 4 kHz 0 Hz 20 kHz within 0 25 dB Fs 176 4 kHz 0 Hz 40 kHz within 1 dB Total Harmonic Distortion plus Noise THD N 116 dBr at 3 dB...

Страница 25: ...evel 126 dBr 0 00005 at 70 dBFS input level Linearity At 0 dBFS to 120 dBFS input level less than 0 4 dB deviation from ideal Spurious Components including Harmonics At 0 dBFS input level maximum outp...

Страница 26: ...ree independent bands Each of them can be set to a mode namely low cut high cut to get rid of disturbing low or high frequencies low shelf high shelf to boost or cut low or high frequencies or peaking...

Страница 27: ...and low cut filter also called high pass filter is displayed Figure 21 Low pass and high pass filter scheme To finalize this section you find an example chart that visualizes examples of frequencies f...

Страница 28: ...uency that frequency then can be suppressed to some extent with the room EQ See section 2 3 6 for instructions about how to find room modes with a slow sine wave sweep If a room mode is very pronounce...

Страница 29: ...applicable on headphones The main impressions you will get with the XTC based playback are Large stereo stage much wider than the space between the speakers A feeling of depth i e a 3 D like presentat...

Страница 30: ...itional resonance frequencies specific noise at various frequencies specific crosstalk between left and right channels specific effects caused by the RIAA emphasis specific amplitude modulation effect...

Страница 31: ...e 24 bit long result The digital to analog converter which converts the samples after the level control may only be capable to handle 16 bit wide samples Thus what should we do with the excessive 8 bi...

Страница 32: ...24 bit converters no question that a level control with a 24 bit word length easily rivals the best analog level controls By the way 24 bits means 16 777 216 quantization steps The last example below...

Страница 33: ...ion should effect the audio signal To be able to use the plugin properly it is helpful to understand how the levels of the plugin effect the audio signal There are two main levels the Dynamic Level an...

Страница 34: ...t of different recordings with a wide range of loudness levels choose a lower and if needed negative Dynamic Level The lower this level is the more the dynamic content is limited The value 0dB is our...

Страница 35: ...ignal untouched This idea is based on the so called m s stereophony Which is a coding process that transforms the signals of the left and right into a different representation The mid signal is the su...

Страница 36: ...can define the Amount of the chosen De Essing effect Independently a special normalization is performed to create a result that is individually matched with the current sound of the music This is need...

Страница 37: ...of how the different modes sound For the parameter Amount a good starting point could be around 6dB Futhermore in the beginning it is more easy for getting to know the sound of the De Esser and findin...

Страница 38: ...le of such a headphone frequency response measurement is plot ted in red In reality such measurements are far more complex This exemplary headphone only creates an amplification imbalance in two frequ...

Страница 39: ...concert hall So Schwede s concept tries to overcome these non linearities of the human sense of hearing with a equalizer design which creates an optimized compensation curve based on the psychoacoust...

Страница 40: ...Weiss Enginering Ltd DAC501 4ch DAC502 4ch 5 Contact Information Weiss Engineering Ltd Daniel Weiss www weiss ch weiss weiss ch User Manual and 38 White Papers...

Страница 41: ...nts spectral treatment overview 25 23 Dummy head microphone 26 24 XTC scheme 27 25 Block diagramm of the Weiss Vinyl Emulator 28 26 Image processing original left quantized without dithering middle qu...

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