Instrukcja obsługi Bellari VP549

Bellari Niesklasyfikowane VP549

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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

The Bellari VP549 is a phonograph preamplier with RIAA EQ.

- RIAA equalization is a specication for the recording and playback of

phonograph records, established by the Recording Industry Association

of America (RIAA).

Connecting the VP549: You have an input for the VP549 that connects

to your phonograph, and the output of the VP549 plugs into your pre-

amp or amplier. The ground post is where things can get complicated.

Ground hums have always plagued the turntable. We recommend using

the ground post to connect to your turntable's ground connection. In our

experience we have never seen a situation where not using the ground

would sound better than using it.

Ground loops are a very common occurrence with audio. The more

equipment you use, the higher likelihood you will have a ground loop.

The term "loop" refers to your ground generating unwanted noise from

traveling back and forth in a loop. The turntable is usually the most likely

component to have a ground issue. Another thing you can try if you

have a ground loop is connecting the turntable ground to the RCA jack's

ground if the ground post is not remedying the issue. One thing to keep

in mind is that ground loops can be anywhere in a system so try and

isolate the components that are the issue before you spend a lot of time

looking at just one component.

Cartridge load capacitance: The VP549 has three settings: 120 pF,

220 pF and 330 pF. Set the switch in the position you feel sounds best to

you. The di󰀨erence might be very slight, but it is there. Most cartridges

come with a capacitance load recommendation in the spec sheet for the

cartridge. For example the Ortofon 2M series asks for a loading of 150pF

to 300pF. Most Audio Technica cartridges state 100pF to 200pF for load-

ing. The VP549 has been tested with multiple turntables and multiple

cartridges. We have found it best to use your ears to set the loading.

You can set the loading switch to any setting 120, 220 or 330 with any

MM cartridge and no damage will be done to the VP549 or your car-

tridge. If you can not hear a di󰀨erence we would suggest that you do as

the cartridge manufacturer suggests, and set the loading switch to their

recommendation for the cartridge you are using.

Rumble lter: AKA "subsonic lter" cuts very low frequencies (below 20

Hz). The purpose of a lter like this is to get rid of annoying frequencies

that disrupt the turntable's sound quality. A good rumble/subsonic lter

should be inaudible, meaning you can not hear when it is on or o󰀨 in the

program material you are listening to. What it will do is help with exces-

sive very low frequency interruptions from the turntable to the preamp.

Trim - Gain: Control to attenuate the signal level up or down. It is not a

volume control, meaning that signal will still be present even when the

level is turned to the lowest point (in this case -10dB as labeled). If at

half way up you are at 0 dB output level then all the way up you will have

+4dB more gain, and all the way down you will be at -10dB down from

a reference of the middle 0 dB. Most users will be best served to set

the control at the middle or 0 setting to get the best outcome. This is not

always the case. In some situations you might need more gain, like when

using a quiet record or a very low level cartridge. In the opposite situa-

tion you might need less gain from a hot or loud record, or if you have a

high output cartridge. The newer cartridges made tend to have a higher

output level than in the past. For instance, the popular Ortofon 2M series

of carts have a 6mV output. This is much hotter than carts of old, as they

were around 4mV to 5mV. When using a 6mV cart you might need to

turn the trim gain control to just below the half or 0 setting. Many factors

go into setting the proper level, but we recommend start at the middle, 0

setting.

Rumble

INPUT

OUTPUT

15 VDC

HEADPHONE/

LINE OUTPUT

VP549

MADE IN USA

www.rolls.com

Thank you for purchasing the VP549. We spent a considerable amount

of time designing and developing the VP549. Hundreds of hours listening

and improving the design. We hope you enjoy using the VP549, and that

it makes listening to your vinyl collection rewarding. We sincerely ap-

preciate the opportunity to build a product for you and participate in your

love of quality music and sound. We love what we do and we’re happy to

help. All Bellari products are hand built in Salt Lake City, Utah by people

who care about high quality music. No surface mount parts are ever used

at Bellari.

The Bellari VP549 has excellent true sound resolution, no frequencies

are omitted. It's tone center is right in the middle of the music. It performs

very well on the extremes and never looses its solid performance when

things get loud. It never gives you the impression that it has articially

u󰀨ed up the bass or over emphasized the treble. It is well balanced and

bold, yet has a very surprising attack that will take your rig to the next

level.

Specyfikacje produktu

Marka:	Bellari
Kategoria:	Niesklasyfikowane
Model:	VP549

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