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Pyramid PA305

300W, Professional Amplifier with LED Level Display and Front 3.5mm Auxiliary Input


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General Features:
  • Professional Sound Reinforcement Amplifier
  • 300 Watts Output
  • Front 3.5mm AUX CD Input Jack
  • MIC 1 Talkover
  • PHONO/MIC 4 Input Selector
  • Phono RCA Inputs
  • THD Better Than 0.05%
  • Controls Volume Up To 4 Microphones
  • Controls Vol./Balance of Phono/CD/Aux
  • Master Output Level Control
  • Rotary Feedback Filter
  • Lighted VU Meter
  • Four 1/4'' & XLR Phone Jacks
  • EQ Input/Output Jacks with Bypass
  • Mix Bus Input Jack Connects To Another System
  • Clipping and Protection LEDs
  • 4, 8, 16 ohms & 70 Volt Speaker Outputs
  • 110/220 Voltage Selector
  • Heavy Duty Aluminum Heatsinks
  • Rack Mountable w/ Handles
  • Power On/Off Switch w/LED Indicator
  • Outputs for 1 or More 4, 8 or 16 Ohm Speakers
  • For Use w/all Mixers, PA Equipment, Home Audio
  • Dimensions: 11-15/16"D x 19"W x 4-15/16"H
  • 1-year Manufacturer's warranty
  • THD at 70 Watts, 8 Ohms, 1kHz, Bow-Pass Filter
    • MIC (PHONE Jack): 0.25%
    • MIC (XLR Jack): 0.35%
    • AUX: 0.20%
    • PHONO: 0.25%
  • Frequency Response (at 1W, +/- 3 dB)
    • MIC (PHONE Jack): 60 Hz - 20 kHz
    • MIC (XLR Jack): 80 Hz - 20 kHz
    • AUX: 80 Hz - 20 kHz
    • PHONO (RIAA 100 Hz/10 kHz): +12 dB/-12.5 dB
  • Input Sensitivity (at 2% THD, 1kHz)
    • MIC (PHONE Jack): 1.35 mV
    • MIC (XLR Jack): 1 mV
    • AUX: 150mV
    • PHONO: 2.8mV
  • Signal-Noise Ratio (Input Shorted) with WTD
    • MIC (PHONE Jack): 60dB
    • MIC (XLR Jack): 54dB
    • AUX: 73dB
    • PHONO: 60dB
  • Notch filter Effect
    • RANGE: 300Hz-3kHz
    • DEPTH: -12dB
  • Hum and Noise with 30kHz Low Pass Filter at 8 Ohms
    • At MASTER VOLUME MIN: 0.75 mV
    • At MASTER VOLUME MAX, Other MIN: 6 mV

Power Specifications

Number of Channels
This is the number of channels that the professional amplifier is designed to power.
Continuous Power @ 8 ohm
This is the continuous (RMS) power output of the amplifier at an 8 ohm impedance.
Continuous Power @ 4 ohm
This is the continuous (RMS) power output of the amplifier at an 4 ohm impedance.
Continuous Power @ 2 ohm
This is the continuous (RMS) power output of the amplifier at an 2 ohm impedance.
Continuous Power @ 8 ohm (Bridged)
This is the continuous (RMS) power output of the amplifier at a bridged 8 ohm impedance.
Continuous Power @ 4 ohm (Bridged)
This is the continuous (RMS) power output of the amplifier at a bridged 4 ohm impedance.
Total Continuous Power
This is the total continuous power rating (RMS) that the amplifier is able to output.
Program Power @ 8 ohm
This is the program power output of the amplifier at an 8 ohm impedance.
Program Power @ 4 ohm
This is the program power output of the amplifier at an 8 ohm impedance.
Max Power Output
This is the maximum power output of the amplifier through all of it's channels.
Total Max Power
This is the combined max power output of all the amplifier's channels.

Amplifier Specifications

Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
73 dB
Frequency Response
The range of frequencies the amplifier will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
Input Sensitivity
This is the input sensitivity of the amplifier.
THD (Total Harmonic Distortion)
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
Voltage Gain
This is the voltage gain of the amplifier measured in decibels.
Cooling Options
These are the different cooling systems used in the amplifier to keep it cool.
These are the type of input connections that the amplifier has.
These are the types of output connections that the amplifier has.

Physical Specifications

The height of the item, measured from top to bottom, in inches.
The width of the item from left to right (side-to-side) measured in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
Weight (Pounds)
This is the weight of the item in pounds (lbs).
Rackmount Spaces
This is the total number of spaces that the preamplifier will occupy when mounted on a rack.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Boyne City, MI

5 Star Amp

December 9, 2013

I purchased this amp to power the speakers in the bell tower at our church. The amp has been running 24-7 since installed. The master volume level is set at about 25 percent and the bells can easily be heard a half mile away.

9 of 14 found this helpful

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Irving, IL

Excellent product

April 14, 2011

I purchased this amplifier for a customer and found that it would do more than we had hoped for. Great power to run the 17 wall speakers that were installed with more than enough to spare.
Glad to see that the speaker outputs were 4, 8, 16 Ohm, 25 volt and 70 volt connections.

I will purchase more in the future for other customers.

7 of 16 found this helpful

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Why did you choose this?
Sonic Electronix Store
This is the best amplifier we have ever used
Karen F on Sep 15, 2014

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Pyramid PA305