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| Loudspeaker | Helix100 : 3D-spiral horn speaker |
| USB audio interface* | EDIROL UA-3D |
| Condenser microphone** | Primo EMU-4535-2 : set with omni directional capsule EM-23A frequency characteristics : 30 - 18,000 Hz (used with no calibration) |
| Software*** | Channel D Software Mac the Scope™ 4.0 : signal analyzer |
| Computer | Apple Power Mac G4 (OS 9.2.2) |
| Pre-amp/Power-amp | Marantz DAC-1 Technics SE-A100 |
| CD player | Sony CDP-555ESJ |
| CD**** | Japan Audio Society Audio Test CD-1 : White Noise ; 20Hz~20kHz |
| * | Sound Blaster Another USB sound card with Mic-In for PC and Notebook |
| ** |
The following mono-microphones may be suitable for the measurement related to audio. Only 28 to 45 US$. Frequency response : 20 - 20,000 Hz. Omni directional. Giant Squid (Electrets condenser mics) Mono Microphone Microphone Madness (Tiny mono cableless mics) SMM-1,TMM-1 and TMM-2 Sound Professionals (Lapel mics) SP-LAV-1 |
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A low price Omni-Directional Measurement Microphone,
BEHRINGER ECM8000 with Preamplifier MIC100 is suitable for real-time analysis with maximum precision. |
| *** | There are lots of signal analyzers for Windows and a little of signal analyzer for Mac on the web sites. |
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If you discard a file created automatically in the initial setting folder and re-install, it may be possible to use a demo or trial version software longer time. |
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As shown above, it may be safe to disconnect the input signal to the speaker from the computer in use with a signal analyzer. |
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The CD-R with white noise burned from a signal generator (usually attached to a signal analyzer) may be suitable for this purpose. |
 left channel |
 mouth output |
 | mono 1m coaxial |
 | stereo 2m center |
 | mono mouth output center (border of mouth) |
 | mono near field response coaxial (10 cm from cone) |