Bellari PA253 Stereo Power Amplifier User Manual

Bellari PA253 Stereo Power Amplifier

INTRODUCTION

The PA253. At every design stage we focused on one thing, sound quality.The chassis is made in Salt Lake City, UT. The steel sheets are cut, bent, formed and finished 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 flow solder the PCB’s, send them to post flow 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 peanuts 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.

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 – Efforts to change the minds of audiophiles

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 efficiency: 90%
• Size: 5.5″w x 3.5″d x 1.25″h
• Weight: 1.2 lbs
• Indicator: 1 Power LED

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.

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.

OPERATION – CONNECTION
The PA253 is a stereo power amplifier. Connect your preferred input RCA or 3.5mm stereo. Connect a pair of speakers to the outputs. Adjust to your desired level.

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