Bellari PA253 User manual

PA253 Stereo Power Amplier
Connection guide
SPECIFICATIONS:
Nominal Output Power 50 watts RMS @ 4 ohms
42 watts RMS @ 8 ohms
Power Stage Gain: 32.6 dB @ 8 ohms
31.4 dB @ 4 ohms
Input Impedance: 10k - 5Hz to 100kHz
Connection Output Impedance: 4 to 8 ohms speakers
Output Impedance: < 0.32 ohms from 20 Hz to 20 kHz
(Measured under 8 ohms)
Dampening factor: > 100
Frequency Response: 3Hz to 43kHz
Phase shift: 0 Deg.
Volume Max gain: 33.7 dB no load
THD: .015% @ 1KHz
Rise Time: < 0.9 µs
Slew Rate: > 20 V/µs, peak-peak
DC Output Voltage: ± 0 mV
Crosstalk: < - 95 dB from 20Hz to 20kHz
S/N Ratio: >100 dB unweighted
PWR: 24 VDC @ 4A (KS100DU) Included.
Power e󰀩ciency: 90%
Size: 5.5"w x 3.5"d x 1.25"h
Weight: 1.2 lbs
Indicator: 1 Power LED
Bellari
Salt Lake City, UT
1/23
What's in the box?
1 - PA253 proudly made in USA
1 - Owner's Manual
1 - 24V power supply KS100DU
1 - Love for audio, Decades of experience building and designing
0 - Eorts to change the minds of audiophiles
MADE IN USA
INPUT OUTPUT RIGHT
Volume
0 10
pwr
PA253
Stereo Power Amplifier
PA253
OUTPUT LEFT
KS100DU
24V 4A
Input

REAR PANEL
RIGHT and LEFT OUTPUT: For connection to your speakers.
RCA INPUT: Source input (preamp, DAC, Phono Pre or other player).
24 VDC: For connection to the included power supply.
FRONT PANEL
VOLUME: Controls the output level for both channels.
3.5MM INPUT: Same functions as the RCA's on the rear just with a Stereo 3.5
MM (1/8") jack on the front for quick accessibility.
POWER: Main power switch for the unit.
INTRODUCTION
The PA253. At every design stage we focused on one thing, sound quality.
OPERATION - CONNECTION
The PA253 is a stereo power amplier. Connect your preferred input RCA or
3.5mm stereo. Connect a pair of speakers to the outputs. Adjust to your desired
level.
Thank you for purchasing the Bellari PA253. We spent a considerable
amount of time designing and developing the PA253. We hope you enjoy
using the PA253, and that it makes listening to your music collection
rewarding. We sincerely appreciate 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.
MADE IN USA
INPUT OUTPUT RIGHT
Volume
0 10
pwr
PA253
Stereo Power Amplifier
PA253
OUTPUT LEFT
KS100DU
24V 4A
Input
MADE IN USA
INPUT OUTPUT RIGHT
Volume
0 10
pwr
PA253
Stereo Power Amplifier
PA253
OUTPUT LEFT
KS100DU
24V 4A
Input
The chassis is made in Salt Lake City, UT. The steel sheets are cut, bent,
formed and nished all by US labor. After that process the steel is then
powder coated to a high gloss red all done by US labor. We silk-screen
the chassis and assemble the PCB's at our Salt Lake City factory. We
then ow solder the PCB's, send them to post ow assembly where we
add the fragile components soldering them in by hand. We test the PCB's
then send them to mechanical assembly were the PA253 is completed
and tested again. The boxes that we use are made in a facility just a few
miles from us. Even the out bound shipping boxes, biodegradable pea-
nuts and printing materials are made in the US.
Yes, some of the parts used like the power adapter, jacks, knob and IC's
are not made by us and come from countries other than the US. We
pride ourselves on keeping as much as we can in the US including 100%
of the product development and design. Even this manual was written in
the US by us.