sonic beacon

 

Sonic beacon Loudspeaker Test Software

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Application Notes

 

 

 

Preamplifiers

Measurement grade microphones usually require a pre-amplifier in order to be used with computer sound cards.

The preamp should supply the phantom power required by its companion microphone. It must have enough gain in order to amplify the microphones output to usable levels. It should also have a relatively flat frequency response, a relatively high signal to noise ratio (SNR) and a low Total Harmonic Distortion plus Noise (THD + Noise) figure.

The following table compares three low cost preamplifiers.

Mike

M-Audio DMP3

 

Studio Projects VTB1

 

ibf-akustik

MP-1r

Channels

2

1

1

Power

100-125 VAC

100-125 VAC

9 Volt battery with plug in for external supply

Phantom Power

48v

48V

Bias supply for EMM-8 microphone

Connectors

TRS

XLR

RF phono jacks

Input

Balanced 3k?

2k?/300?

Unbalanced 2k?

Capacitor coupled

Response

20-80000Hz; +1 dB

20-20000Hz, +0.25 dB

20-20000Hz, +0.2 dB

Gain

66dB

72dB

52dB

SNR

115dB

 

70dB

THD + Noise

0.02%

0.0015%

0.04%

Output

Balanced XLR 550?

Balanced XLR 100?

Unbalanced 2k? minimum load

Photo

 

large product image

 

 

large product image

 

 

 

 

 

Cost

US$199, 127 

US$220, 141

US$266,171

 

What We Do

Sonic beacon produces electrical and acoustical data acquisition and analysis software for the Windows operating system.

 

About Us

Sonic beacon is a Canadian organization that provides a free set of virtual instruments that are useful for measuring the time and frequency domain responses of audio components using a personal computer. It is located in Pakenham Ontario which is near Ottawa, Canada.

News and Events

March 23, 2014: 32 and 64 Bit Versions of sonic beacon (1.1.0.9) released. Tested on Microsoft Windows 8 (64 Bit), Microsoft Window 7 Home Premium (64 Bit) and Windows XP 32 Bit Professional.

Copyright 2007 sonic beacon. All rights reserved.