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Custom DIY 8" Fullrange Driver
Custom DIY 8" Fullrange Driver
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Old 3rd June 2017, 11:43 AM   #21
ghemml is offline ghemml  Singapore
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Quote:
Originally Posted by ICG View Post
Well, that's not why you want the whizzer big. The whizzer does radiate hights but - like a large dome- or cone-tweeter, the narrower it goes on the top end. And on the lower end of the whizzer, you usually want to 'start' where the cone starts to drop off. Or, to be more precise, where the breakup starts. Since you can correct the response passive but cannot correct the radiation pattern (not even with a DSP), naturally, the radiation pattern is what dictates the size of the whizzer.
Cone breakup makes me want to use a thinner paper for the whizzer cone.

But still just ran a DCR measurement... its 8.7ohms

So 0.14mm VC wire is not suitable, probably had to use 0.15mm
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Old 11th June 2017, 02:36 AM   #22
ghemml is offline ghemml  Singapore
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Just got back, did some test measurements on the TS parameters. And I discovered I had used the wrong wire gauge, and the Re values is abit too off.

Click the image to open in full size.

But anyway the drivers are measured, since they are just prototype I will have to keep in mind using the correct gauge for the VC during the next round of fabrication.

Click the image to open in full size.
Click the image to open in full size.Click the image to open in full size.
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Last edited by ghemml; 11th June 2017 at 02:39 AM.
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Old 11th June 2017, 03:05 AM   #23
Upfront is offline Upfront  Australia
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We live and learn. Beautiful work so far mate.
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Old 11th June 2017, 03:17 AM   #24
ghemml is offline ghemml  Singapore
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Thanks.

I must say, it is very difficult to measure small gauge wires DCR. The thin ends contacts makes it very difficult to crimp with crocs clips and I always end up values that are not constant

This is the measurement I got from WT3

* Piston Diameter = 160.0 mm
* f(s)= 63.93 Hz
* R(e)= 8.86 Ohms
* Z(max)= 392.40 Ohms
* Q(ms)= 12.015
* Q(es)= 0.277
* Q(ts)= 0.271
* V(as)= 31.150 liters (1.100 cubic feet)
* L(e)= 1.16 mH
* n(0)= 2.80 %
* SPL= 96.57 1W/1m
* M(ms)= 11.30 grams
* C(ms)= 0.55 mm/N
* BL= 12.05

Last edited by ghemml; 11th June 2017 at 03:28 AM.
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Old 11th June 2017, 03:28 AM   #25
Upfront is offline Upfront  Australia
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Very difficult. I don't envy you in that respect. But where there is a will, there is a way. Keep up the good work.
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Old 28th June 2017, 03:50 PM   #26
ghemml is offline ghemml  Singapore
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Super busy with work lately but finally got to assemble my 8 inch prototype and get it ready for the Audio Show in KL in July

Click the image to open in full size.
Click the image to open in full size.

https://youtu.be/eFzjlTlpdFY

Will perform measurement this weekend as I got matters to attend.
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Old 28th June 2017, 04:08 PM   #27
perceval is online now perceval  Taiwan
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Looking very nice.
Love the color scheme.

Experimenting with different feet options?
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Old 28th June 2017, 04:28 PM   #28
ghemml is offline ghemml  Singapore
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Originally Posted by perceval View Post
Looking very nice.
Love the color scheme.

Experimenting with different feet options?
Makeshift footers, LOL.
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Old 2nd July 2017, 04:12 AM   #29
ghemml is offline ghemml  Singapore
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A quick measurement I made:

Click the image to open in full size.
Freq Response

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Cumulative Spectrum Decay

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After Baffle Step Correction

Last edited by ghemml; 2nd July 2017 at 04:15 AM.
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Old 4th July 2017, 08:53 AM   #30
hm is offline hm  Europe
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Default superb driver

well done, i would try it in my saxophon or RDH20, with invers driver, for show and sound,
you fill ~6 dB up to 2 kHz, bass down 30 Hz and minimal lenar membran moving, plan for free if you will test it.
Attached Images
File Type: jpg RDH20 TB1772 monacorSPH-210 web.jpg (128.9 KB, 131 views)
File Type: jpg oskarr1web.jpg (46.5 KB, 141 views)
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