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Author Topic: Tascam TH02 Measurement  (Read 19988 times)

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Solderdude

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Re: Tascam TH02 Measurement
« Reply #120 on: April 07, 2014, 05:14:39 AM »
I had completely forgotten about that.
Made me wonder though....

A: Why didn't/don't/won't they default to non-smoothed plots ?
B: How hard would it be to add another dropdown/button to select between raw, non-smoothed, smoothed and maybe even uncorrect the 'double' x-field correction.

It would make the tool much more valuable.
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Lizardking1

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Re: Tascam TH02 Measurement
« Reply #121 on: April 09, 2014, 10:04:28 AM »
Has anyone made a CSD plot of them with the back removed? It would seem logical, since the resonance was being attributed to the cheap housing, that we would see major improvements. I flipped through this thread and couldn't find any, let me know if I'm wrong.
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Solderdude

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Re: Tascam TH02 Measurement
« Reply #122 on: April 09, 2014, 11:38:31 AM »
Quote from: Lizardking1 on April 09, 2014, 10:04:28 AM
Has anyone made a CSD plot of them with the back removed? It would seem logical, since the resonance was being attributed to the cheap housing, that we would see major improvements.

Here you are:

Aside from the labels it isn't very hard to see which one is closed back and which one is open back.




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OJneg

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Re: Tascam TH02 Measurement
« Reply #123 on: April 09, 2014, 01:45:42 PM »
My CSD tests between back and no-back were similarly inconclusive, but I attributed it to mostly to my coupling mechanism. Also, I hear the echo-iness to be more in the mids (<1k) which the CSDs don't seem to capture well without a longer window.
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Thujone

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Re: Tascam TH02 Measurement
« Reply #124 on: April 09, 2014, 05:46:54 PM »
The 1k region definitely looks worse on the closed. I wouldn't doubt it gets worse on the way down.
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PhoenixClaw

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Re: Tascam TH02 Measurement
« Reply #125 on: April 10, 2014, 01:04:00 AM »
would a generous layer of blu tac followed by foam and felt (blu tac at the very back of the cover while felt on top) help to clean up the CSDs? That's what I'm planning to do for mine.
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Solderdude

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Re: Tascam TH02 Measurement
« Reply #126 on: April 10, 2014, 05:16:37 AM »
I made a CSD of a closed TH02 with damping felt on the back and filled (generously) with sheep wool showed the 1kHz 'ringing' was reduced around 10dB (roughly) between open back and closed back.

The CSD of my 'DT330-TH02' also showed showed some ringing around 1kHz but the DT330 has a grid which is 50% open.

The ringing was about 10dB lower in amplitude, shorter lived and had different 'humps' in decay time.

The visible reduction of 1kHz components seems to be caused by the cups.
I could not see any differences in CSD between 100Hz and 500Hz so only the 1kHz band seems affected which is clearly visible in the CSD.
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PhoenixClaw

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Re: Tascam TH02 Measurement
« Reply #127 on: May 04, 2014, 01:31:15 AM »
Hi all. I just want to share the simple mod I did with my tascams

I removed the back cups and instead used a pvc mesh as a "grill" of sorts and it's held by blu tac from the inside. I used HM5 pads with a foam disc sandwiched between the cloth of the pads and the driver opening.
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OJneg

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Re: Tascam TH02 Measurement
« Reply #128 on: May 04, 2014, 04:53:05 AM »
Excellent! I might look into those grills. Also want a double sided cable too... :)p14
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PhoenixClaw

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Re: Tascam TH02 Measurement
« Reply #129 on: May 04, 2014, 05:35:34 AM »
It would be good to recable these. I accidentally pulled one of the wires off the left driver when I was applying blu tac on the inside, I guess because there were too many wires attached to it and wasn't easily movable.
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