background image

13

S T E R E O

Control elements

appropriate frequencies, thus changing the spectral content of the original

signal. The S

TEREO

V

ITALIZER

, however, relies on a more subtle method of

amplitude-depending phase shifting. This does not involve altering the

spectral composition of the signal but it does maintain the subjective

impression of loudness. Moreover, graphic equalizers produce comb-filter

effects because of the interaction between adjacent filters, when broad-

band frequencies are raised. The M

ID

-H

I

T

UNE

filter can raise the broad-

band spectrum with a very linear frequency response, without colouring

the signal.

Above the M

ID

-H

I

T

UNE

value set, the S

TEREO

V

ITALIZER

filters create a

linear increase, i.e. one that is adapted to the human ear. This compensates

any inability of our hearing as regards perceiving frequencies ranging

between 5 kHz and 10 kHz. The M

ID

-H

I

T

UNE

filter works with a wide

bandwidth and always sounds musical, never »bell-like«. Gradually go

down from 20 kHz (extreme left) to lower frequencies. The further down

you go, the brighter the sound image becomes, as an increasing number of

frequencies are included in the process.

The M

ID

-H

I

T

UNE

control can also be used to tone down excessively

sharp-sounding material, by setting frequencies of 10 kHz or higher, and

setting the P

ROCESS

control on M

AX

. Seeing as the P

ROCESS

control is also

responsible for deleting dominant mid frequencies, all frequencies are

gradually reduced down to the application frequency, in conjunction with

high starting frequencies of the M

ID

-H

I

T

UNE

control.

The  P

ROCESS

control determines the ratio between B

ASS

and M

ID

-H

I

T

UNE

to the original signal. The H

ARMONICS

control is not affected by the P

ROCESS

control.

The P

ROCESS

control also determines the damping intensity of dominant

mid frequencies. This allows rapid adaptation to the loudness curves

(Fletcher-Munson curves, curves of equal loudness).

The human ear perceives the audio frequency spectrum at varying sound

pressure levels very differently. Perception is by no means »linear«. The

Process

5

Fig. 3:

Five frequency responses are
shown for the M

ID

-H

I

T

UNE

filter at max. P

ROCESS

value

and B

ASS

at 0.

1. 1 kHz
2. 2 kHz
3. 3,5 kHz
4. 8 kHz
5. 20 kHz

Summary of Contents for STEREO VITALIZER 9320

Page 1: ...Owner s Manual SOUND PERFORMANCE LABORATORY STEREO Models 9319 9320...

Page 2: ...ons of Liability In no event will SPL be liable for any damages including loss of data lost profits cost of cover or other special incidental consequential or indirect damages arising from the use of...

Page 3: ...ssors currently available The STEREO VITALIZER is a first rate sound processor with exemplary performance excellent work manship and unrivalled sound quality Please study this owner s manual carefully...

Page 4: ...w transparent and powerful almost every audio signal sounds after it has been processed with the STEREO VITALIZER The housing of the STEREO VITALIZER has the standard 19 EIA format and occupies 1 unit...

Page 5: ...Two positions are available The LOW position indicates that the input sensitivity of the STEREO VITALIZER is low which means high level signals can be processed at this position Conversely the HIGH p...

Page 6: ...rdings played through the same monitor system Do not connect the STEREO VITALIZER between master outputs and amplifier The major disadvantage of this connection is the varying input sensitivity with e...

Page 7: ...to compen sate for deficiencies in the copying system It may also be necessary to modify the bass end as many high speed systems fail to reproduce the bass end of the spectrum faithfully In both areas...

Page 8: ...oundtracks benefit in the ways already described for audio only applications and the fact that the STEREO VITALIZER is so quick to set up can save a lot of wasted time spent tuning multi band equalize...

Page 9: ...to the right The bass sounds tight and dry Turn to the left The bass sounds soft and round You should perform these hearing tests on appropriate full range monitors because near field monitors normall...

Page 10: ...e familiar disadvantages of this principle are as follows although odd harmonics do add to the brilli ance of the audio signal to a significant degree they tend to be somewhat sharp which leeds to hea...

Page 11: ...only light up briefly if at all It is essential to avoid the PEAK LEDs being lit up for any length of time If they do so reduce the input level or switch from LOW to HIGH on the rear of the unit The B...

Page 12: ...a different bass structure than with a lower bass amplification combined with a higher PROCESS value Choosing the best solution is a matter of personal taste and also depends on the type of original s...

Page 13: ...lower frequencies The further down you go the brighter the sound image becomes as an increasing number of frequencies are included in the process The MID HI TUNE control can also be used to tone down...

Page 14: ...le of Exciters The STEREO VITALIZER s harmonic filter does not add any distortions to the original signal unlike with the generator principle It extracts all the infor mation it needs from the origina...

Page 15: ...he integral power supply is designed to minimize induced hum and noise due to the non existence of an air gap On the XLR jack version 9320 the primary voltage may be selected between 230V 50Hz and 115...

Page 16: ...uency range 15 Hz 22 kHz CMRR common mode rejection 85dBu at 100 Hz 76dBu at 1 kHz 65dBu at 15 kHz THD N total harmonic distortion noise 0 002 at 1 kHz 0 105 at 10kHz Signal to noise CCIR 468 Bypass 9...

Page 17: ...ized SPL warranty repair facility in the country where purchased or to the SPL factory in Germany in the original packaging or a replacement supplied by SPL with all transportation costs and full insu...

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