Rolls Bellari PA253 42W Stereo Power Amplifier

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 powder coated to a high gloss red done by US labor. We silk-screen the chassis and assemble the PCB's at our Salt Lake City factory. We 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 and send them to mechanical assembly were the PA253 is completed then 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.

Specifications:

• DC Output Voltage: ± 0 mV
  
• S/N Ratio: >100 dB unweighted
  
• Crosstalk: < - 95 dB from 20Hz to 20kHz
  
• THD: .015% @ 1KHz
  
• Phase shift: 0 Deg.
  
• Power efficiency: 90%
  
• Power Stage Gain: 32.6 dB @ 8 ohms 31.4 dB @ 4 ohms
  
• Input Impedance: 10k - 5Hz to 100kHz
  
• Output Impedance: < 0.32 ohms from 20 Hz to 20 kHz (Measured under 8 ohms)
  
• Dampening factor: > 100
  
• Frequency Response: 3Hz to 43kHz
  
• Volume Max gain: 33.7 dB no load
  
• Rise Time: < 0.9 μs
  
• Slew Rate: > 20 V/μs, peak-peak
  
• Nominal Output Power 50 watts RMS @ 4 ohms 42 watts RMS @ 8 ohms
  
• Connection Output Impedance: 4 to 8 ohms speakers
  
• PWR: 24 VDC @ 4A (KS100DU) Included.
  
• Size: 5.5"w x 3.5"d x 1.25"h