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panson_hk panson_hk is offline

diyAudio Member


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About Me

  • About panson_hk
    BEng, MPhil, PhD; IEEE, AES
    DIY for audio and embedded systems; biking, hiking
    Independent consultant
    Hong Kong


Total Posts
  • Wiki Contributions: 0
  • Wiki Comments: 0
  • Recent Wiki Activity: panson_hk has no recent wiki activity
General Information
  • Last Activity: Yesterday 11:28 PM
  • Join Date: 19th August 2005


Showing Friends 1 to 10 of 13


View panson_hk's BlogRecent Entries
Latest Blog Entry

Posted 24th July 2015 at 08:18 AM by panson_hk Comments 6
Posted in Uncategorized
I purchased a pair active speaker. This is manufactured by Fountek under the brand Rhyme Acoustic. The model number is A-100. It uses a 4" full-range driver with vented box. The electronic is contained in the right channel enclosure. The amplifier is LM4766 chipamp. The overall build quality is good. I just paid RMB 399.00 during its sales period. What a good deal!

Chinese product link is The frequency response shown in this product page does not match with that given the user's instruction of my pair. The curve shown in user's instruction does pretty much match with my initial listening impression: lack of treble.

I measured the speaker with my CLIO Pocket. Measurement shows left and right enclosure response are matched very well.

The last figure shows the left box (passive) driven by another amplifier. We can then see what filtering or EQ is...

Posted 14th July 2015 at 02:37 AM by panson_hk Comments 0
Posted in Uncategorized
I use DeskProto to generate toolpath for the CNC controlled by Mach3.

Posted 14th July 2015 at 01:44 AM by panson_hk Comments 0
Posted in Uncategorized
I am enjoying all the fun of building speaker enclosure. An inexpensive 2" full-range is employed. The cube is made by MDF. I have measured TS parameters of the driver and its response with a big baffle. I use Basta! and LEAP-5 to simulate the box's response and impedance. Once the box is built, I can compare actual and simulated data.

Two cubes will be built. One is sealed and the other is with passive radiator.

Posted 14th July 2015 at 01:32 AM by panson_hk Comments 0
Posted in Uncategorized
I am using a handheld force meter and caliper to measure compliance of passive radiators. The force meter is clamped to the caliper. Caliper is used to show the panel displacement whereas force meter displays the corresponding force. I can then obtain compliance C mm/N. I am planning to use an Arduino controlled Z-axis for automatic measurement. The force meter has a USB interface for data acquisition.

I should be able to measure BL vs displacement of a driver by adding a programmable DC supply.

Posted 8th June 2015 at 02:47 AM by panson_hk Comments 0
Posted in Uncategorized
Thanks to the SMART feature of the hard disk and the utility which warned me the disk was dying. I was able to backup a WIN7 system image before things happening. Restoring the image on a new hard disk was done smoothly.
Recent Comments
No, not fully discrete...
Posted 28th July 2015 at 02:58 PM by abraxalito abraxalito is offline
A fully discrete one?...
Posted 28th July 2015 at 01:19 AM by panson_hk panson_hk is offline
Hi Panson, long time...
Posted 27th July 2015 at 11:13 PM by abraxalito abraxalito is offline
How are you, Richard?...
Posted 27th July 2015 at 04:58 AM by panson_hk panson_hk is offline
They're using TL084...
Posted 25th July 2015 at 02:56 AM by abraxalito abraxalito is offline
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