Bellari VP549 Handleiding

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VP549 Phono Preamp

SPECIFICATIONS

I/ O Connectors: RCA, 1/8" TRS Stereo

Gain: 41.51 dB gain @ 1kHz at the "0" setting

31.64 dB of gain at the "-10" setting

45.66 dB of gain at the "+4" setting

Input Impedance: 47k ohms

Output Impedance: 32 ohms Headphone, 470 ohms RCA

Frequency Response: 3Hz to 36kHz

Equalization: RIAA +/- 1 dB, 14Hz to 23kHz

Rumble Filter: 20Hz

THD: .005% @ 1KHz

S/N Ratio: >94 dB unweighted

PWR: 15 VDC

Size: 5.5"w x 3.5"d x 1.25"h

Weight: .8 lbs

Indicator: 1 Power LED

Bellari is a division of Rolls Corporation

Salt Lake City, UT

4/18

The RIAA equalization curve was intended to operate as the

global industry standard for records since 1954. However, it

is almost impossible to say when the change actually took

place.

RIAA equalization is a form of pre-emphasis on recording

and de-emphasis on playback. A recording is made with the

low frequencies reduced and the high frequencies boosted,

and on playback the opposite occurs. The net result is a at

frequency response, but with attenuation of high frequency

noise such as hiss and clicks that arise from the recording

medium. Reducing the low frequencies also limits the ex-

cursions the cutter needs to make when cutting a groove.

Groove width is thus reduced, allowing more grooves to t

into a given surface area, permitting longer recording times.

This also reduces physical stresses on the stylus which

might otherwise cause distortion or groove damage during

playback.

A potential drawback of the system is that rumble from the

playback turntable's drive mechanism is amplied by the

low frequency boost that occurs on playback. Players must

therefore be designed to limit rumble, more so than if RIAA

equalization did not occur. Using a rumble lter to lter out

the subsonic frequencies many help mitigate the noise from

the turntable.

INPUT

OUTPUT

15 VDC

HEADPHONE/

LINE OUTPUT

+

-

VP549

MADE IN USA

www.rolls.com

Rumble

0

Product specificaties