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DIY - you may not save money, but you can earn many ... fun, new knowledge, experience, ... even money at last


star A.C. Devices
star A.C. EMI Filter
star A.C. Spectrum Verion 2
star A.C. Spectrum
star Digital Oscilloscope
star Flat Top A.C.
star Isolation Transformer - Safer Power Supply ?
star Isolation Transformer
star MCB - For Testing
star Relay - Power Failure Manual Reconnection System
star Soft Start Circuit
star Soft Start Circuit 2
star Tube Amplifier
5Z3P, 6N9P, EL34

Useful Info.

star AWG Vs mm

My AV System

star System Info.
star Testing Result 2016-5-14
star Testing Result 2014-7-27

Case Opening

star Cambridge Audio
CA 351C
star KEF Q300 Speaker


star 5z3p 6n9p EL34
Tube Amplifier DIY kit
star AudioQuest USB A-B Forest 1.5m
star B&W 685 S2 speaker
star WireWorld RCA Luna 7 1m

Other DIY

star Medeco Lock Replacement
star Vacuum Pump for RC Oil Damper

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My System Test



Equipment under test

CAS Lenovo Z360 + Foobar2000
2.1 Amplifier Cambridge Audio 651A
Speaker Cable Qed Ruby Anniversary Evolution
Speaker KEF Q300

Test Equipment

Microphone iMM-6 iDevice Calibrated Measurement Microphone
Software Spectrum Analyser by keuwlsoft ( freeware at Google Play)

The test result was gotten by playing the WAV file through my CAS system.

Although the Mic is calibrated, the software is not. There is no option for entering the calibrated data of the mic into the software which is a must for the professional software.

Of course, this is not professional method to test a system. This can only give you a rough information about your system's performance ... ... and your ear's performance.

As I always say ... ... before upgrade the equipment, test your body's performance ... ... for the AV system, please check / test your ear and your eye by a professional.

When playing the WAV file, I found that I cannot clearly hear the sound from 15k Hz and above; however, the test equipment still record there are sound coming out from the speakers.

This graph is plotted by the data from the Spectrum Analyser. The value is refer to the Max. value (Red).

You may get more information / test tone from:

Moreover, you may try to move your head or even go around the listening room. You may have a new experience about where the Perfect Listening Seat is. Actually, there is no such thing in the real world ... ... except you fix your head at one spot.