DIY 自作派同好同學會 |
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回覆 (112): DIY 自作派同好同學會
有時都懷疑自己可能天生係電子器材殺手。  
 
jcml
09-02-09
13:38:43
回覆 (111): DIY 自作派同好同學會
Just curious to know why you guys do have such so bad experience.... I seldom face such defect in my past no matter PC or audio gears ( TOUCH WOOD ). Is better brand got better reliability ? Or better usage envirnoment serves better ?  
 
P.S. my DVB TV USB finger serves me for more than one year and still in operation.....  
 
^__~  
 
Vash
09-02-09
12:44:07
回覆 (110): DIY 自作派同好同學會
 
 
True, it runs hot. I have one in the offfice. It does not work sometimes, due possibly to inadequate RAM of my desktop computer, I think.  
 
 
limage
09-02-09
12:35:00
回覆 (109): DIY 自作派同好同學會
Even worst, I heard that they are very hot and quite easy 打柴.....  
 
accphoto
09-02-09
12:21:23
回覆 (108): DIY 自作派同好同學會
accphoto, why don't go for a USB digital TV finger ?  
 
Vash
09-02-09
11:59:19
回覆 (107): DIY 自作派同好同學會
Same to me..... change the TV card in PC but still bad.....
accphoto
09-02-09
11:52:57
回覆 (106): DIY 自作派同好同學會
現在的電器可能平,QC求其,新的都壞或極易壞!  
電腦file 一定要有backup!
jcml
09-02-09
11:26:13
回覆 (105): DIY 自作派同好同學會
Vash,  
 
今年運氣太好,年卅晚買的電視是神神地,開機要花十幾分鐘 ,其實不應該更換;現在一開卽着,大人晚晚大看電視,希望祇是短期現像。  
 
年初四下午換完電視,輪到電腦扭計,入不到Windows!結論是 hard disk 收工,結果是換個隻 hard disk。  
 
新年大部份時間就花掉在 這两件電器上!
jcml
09-02-09
11:14:41
回覆 (104): DIY 自作派同好同學會
jcml,  
 
How's your new PC ?  
 
Vash
09-02-09
10:40:41
回覆 (103): DIY 自作派同好同學會
Vash,  
 
Mozart Wind Serenades 唔買住,thank you.
jcml
09-02-09
10:25:27
回覆 (102): DIY 自作派同好同學會
Tommy 哥,  
 
生意興隆,大展鴻圖!
jcml
09-02-09
10:20:42
回覆 (101): DIY 自作派同好同學會
Typo., correct link for this Mozart Wind Serenades is....
https://sslrelay.com/s179260996.oneandoneshop.co.uk/sess/utn;jsessionid=15498e2fe30f0a4/shopdata/0005_Hi-Resolution+Music/product_details.shopscript?article=0020_Royal%2BPhilharmonic%2BOrchestra%3D3A%2BMozart%2BWind%2BSerenades%2B%2B%3D28HD%3D29%2B%3D28HD
Vash
09-02-08
09:20:34
回覆 (100): DIY 自作派同好同學會
accphoto, hercules, jcml, rcwy, welborne.......  
 
Any interest on this new NAIM issue ? CD + Hi-res. package. Price tag. GBP17.99 per set. Shipping for 1 set or up to 10 set are same as GBP 9 only.
https://sslrelay.com/s179260996.oneandoneshop.co.uk/sess/utn;jsessionid=15498e2fe30f0a4/shopdata/index.shopscript
Vash
09-02-08
09:18:44
回覆 (99): DIY 自作派同好同學會
>>>DIY唔好停喎>>.<<  
 
Yes, sir !  
 
Tommy 哥, 俾心機做野 x 2 !!  
Vash
09-02-08
08:02:46
回覆 (98): DIY 自作派同好同學會
這裏大陸都通行嘛.又唔洗寫信.......  
 
 
>.<
smltommy
09-02-08
01:11:12
回覆 (97): DIY 自作派同好同學會
 
 
Tommy 哥,  
 
俾心機做野,仲要記得寫信番泥喎!  
 
 
 
limage
09-02-08
00:35:35
回覆 (96): DIY 自作派同好同學會
明早北上開工了,各位保重.........  
 
 
 
DIY唔好停喎>>.<<
smltommy
09-02-07
23:24:23
回覆 (95): DIY 自作派同好同學會
1955 DAC....
accphoto
09-02-07
16:53:24
回覆 (94): DIY 自作派同好同學會
1955 套件有興趣嗎?香港有一套......  
---------------------------------------  
Anthony  
 
1955都有套件?還是原裝11A呀?
Popeye
09-02-07
16:01:43
回覆 (93): DIY 自作派同好同學會
Colin Hing,  
1955 套件有興趣嗎?香港有一套......
accphoto
09-02-07
15:26:17
回覆 (92): DIY 自作派同好同學會
諗緊  
你都有性趣?  
Clone 11A 比 Clone 12.1 容易..  
----------------------------------------  
 
DD  
 
有得諗就有性趣^-^.
Popeye
09-02-07
09:51:33
回覆 (91): DIY 自作派同好同學會
有無興趣clone番一對^__^.  
________________________  
 
Colin  
 
諗緊  
你都有性趣?  
Clone 11A 比 Clone 12.1 容易..  
 
^O^  
 
dd845
09-02-07
09:40:37
回覆 (90): DIY 自作派同好同學會
Hi DearAbby ,  
 
Following your advice, and intrigued by what change in sound i may hear, i just could not wait longer and went to Mak's at Hung Kong centre and get a few pieces of HK$25/piece made in mexico 30uf film cap and rushed to kwai hing studio.  
 
The first thing i did was the remove the 10uf from the low pass...there is some change and seems the mid has a higher density. nice direction, or perhaps there is not much change, anyway, i don't hear anything obviously wrong. There is one special thing about open baffle. It is more difficult to detect subtle slop/crossver point change as sound is diffused around the room.  
 
Then I put in a 30uf in each of the rail entering the coaxial, in series, and listen..um...i dont' like the sound, something is missing, and the sound becomes very thin and "razor sharp" and a bit eardrum piercing. I listened to a few violin solo and i could only hear the metallic harmonics but the woody resonance seems to have vanished, or reduced to a large extent. The coaxial driver on top seems to be singing alone and away from the two drivers on the bottom...on human voice, everyone becomes at least 10 years younger, and everyone has a smaller throat and chest...not a good change to my taste. But this 30uf does successfully limit the excursion of the coaxial main cone and there is no more "dee dee" cone cry even i crank up the volume for drums and systheized deep bass.  
 
I will try 60uf by parallelling two 30uf.  
 
But at the end of the day, i think the most useful tool is to look at what we are hearing by using RTA to check on the frequency response curve, rather than shooting in the dark like what i am doing. I am sure there will still be fine tuning but at least we would be mucking around the target instead missing by miles. Whether we are using passive of active, we need to have a way to measure the change.  
 
I wish i have an rta here handy, but at this stage i don't even have set of computer at my hifi studio, not to mention any calibrated mic, software etc.  
 
Welborne
09-02-07
03:06:39
回覆 (90): DIY 自作派同好同學會
DD  
 
有無興趣clone番一對^__^.
Popeye
09-02-06
20:32:13
回覆 (89): DIY 自作派同好同學會
Dear Melbourne  
If my comments helped you think twice I hope it is not because I tried to influence you. I just wanted to exchange thoughts and I told you my own true opinion that had refrained me from taking the active route. I am more of a naturalist and the more I think about it, the more I would stay away from active. Fundamentally active xo is a pro sound tool and pro sound is built on "sound manipulation" rather than "sound natural". The fact that all active xo are based on 4th order filters or higher is a sure guarantee that you cannot get clean sound.  
 
Caps at Wing Shing is OK. I usually buy Solen there as the price is very reasonable and its stock is complete. Do you need to use more expensive caps? I doubt it (as much as the lampizator guy).  
 
I did not follow his speaker projects at all until yesterday as I explained. I have no knowledge of saba but from what I read I have no doubt that it is good. In fact I have little doubt that all vintage speakers that survived are good. Very simple, hifi goods were properly manufactured before the mid-70's.  
 
Is the 5 ohm you mentioned DCR (measured by meter), or "rated impedance"? Technically there is a relationship between the size of cap, and the speaker impendance. Any one can tell you that, but my advice is forget it for two main reasons: the only impendance you can measure is DCR, but rated impedance is meaningless for there is no measure whatsoever of what a speaker's impedance is. It is frequency dependent and also dependent on the speaker's capacitive or inductive tendencies. Simply, it is a moving target. Second, if you cannot pin down the impendence, you cannot determine the cap value, period. Even if you do, the cap still may not act (electrically) in the way calculation shows. That is, the value of the filter is speaker dependent too. So the best way to tackle it is to come up with any (close enough) value estimated from the Xc formula, and then set a range of +/- 50% and make listening tests against it. That is how I suggested you try 30u to 100u. I have a strong hunch that the right value is somewhere in between. Indeed, if you can test only once, I bet that 60u is the best to start with. Perhaps what you can do is to get a 30u and 60u ready, and you can double them to 90u. Try all 3 combinations and see which once best suits your taste.  
 
Beside that, the other thing you should also try is to wire the mid in normal polarity rather than reverse polarity as lampizator suggested. He had to because in his case, he made the LPF 2nd order. In you case, since you removed the 10u cap, it doesn't matter whether the mid is wire in-phase or out-phase. But try the compare both wirings and see which you like better. The better wiring is the one that gives you a "depth of sound field".  
 
I am quite sure you are getting close to the best possible sounding scenario (relying on lampizator's comment that his p24 is the best sounding speaker in the world).  
 
 
 
 
DearAbby
09-02-06
17:15:55
回覆 (88): DIY 自作派同好同學會
DearAbby hing,  
 
thanks for your useful tips. Yes I am "almost" to go the active route and i hvae located an active crossover set that is cheap, an dbx, but like you said, the sound i am now getting is quite good alread and i don't feel the crossover is getting in the way. Going active xover also means i need one extra amp, which is fine as i have a spare el84 amp too. Let me try your suggestion. But i have been looking for reasonably good 30uf or 100uf caps but seems most that i can find in Wing Shing of these higher values are quite expensive. Any suggestion?  
 
BTW, since you have already checked out the Lampizator site quite some time ago, have you also followed his saba project in similar fashion? what do you think of those saba? btw, those saba green 8" as well as 10" like mine are all 5ohm impedance, does this affect the decision using the 30uf vs 100uf?  
 
^^
Welborne
09-02-06
12:18:44
回覆 (87): DIY 自作派同好同學會
Dear Welbourne  
Yes, you should take out the 10u while keeping the 4mH coil. You heard the mid overlap probably because you did not have the coil. Also try putting the 30u in front of the mid. You your ears to make the tuning and it is alway easier to change cap value than coil value.  
 
Active crossover? I am skeptical. I almost moved into this route but I took a different course in my road to nirvana by tweaking passive crossover.  
 
This is how I think. XO is a must. Whether active devise of passive devise is used actually does not matter. What matters is the "accuracy". At a first glance active crossover might be attrative because it allows you to adjust the XO values/points easily and instantaneously. However, it may also be difficult because any adjustment may end up "too much, too out of balance". My philosophy is, if you cannot manage frequency tuning at the passive level, you certainly cannot manage it at the active level. The danger of active xo is you also (can) adjust the SPL at the same time you adjust the xo point. At the passive level, SPL adjustment is kept within a narrow range so that the effect of SPL and xo points is isolated and mixed up. My comments here is strictly for audiophile purpose and not for pro sound management, which is an entirely different story.  
 
That is just my thoughts as I have not actually done active xo. What I did instead is to make an adjustable passive crossover network. It is quite simple. I make box with a rotary switch that I can select 5 values of cap, 5 values of R, and 2 to 3 values of coils, all you need is one such box for the mid. The HPF is almost always 3.3u and the LPF is always between 2 to 4 mH. These values are from my experience and initially I also made switches to help me choose the right value. After enough experimentation my conclusion is "all you need to manage is the mid and how it is phased into the low. After that you add the high to achieve timbre, like the stroke of paint."  
 
This switchable xo is very useful, and it allow you to "trial and error" and over time I have developed a sense of "what effect is on which speaker at what cap value".  
 
It is fun. Looks like you already have lots of it and there is a lot more there waiting for you.
DearAbby
09-02-06
12:04:46
回覆 (86): DIY 自作派同好同學會
jcml, no la.... as you may know I got too much stuff recently...  
 
BTW., the only point that I found Behringer mic/line pre. attractive is the faceplate only.... a little EMT alike.  
 
Vash
09-02-06
11:22:59
回覆 (85): DIY 自作派同好同學會
I think you can still buy it if you like to:  
 
http://www.solotechnic.co.uk/behringer-tube-ultragain-t1953-micline-pre-amplifier-i28483.html
jcml
09-02-06
10:04:24
回覆 (84): DIY 自作派同好同學會
Yes, it's really a different beast. The T1953 mic./line pre. tube amp. is very nice in looking. What a shame that it's just got discontinued.....
Vash
09-02-06
09:49:44
回覆 (83): DIY 自作派同好同學會
why usb? i thought it is a sound card....  
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it is because you can use it on a portable and adc/dac is different for the usb version.  
 
btw, i read that in most sound cards with the "mic" input, it has hugh cut off in the bottom frequency and that's why in Carma's menu they recommend using mic preamp and not the "mic" input, but "line" with mic preamp..  
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this is a different beast. it is intended to be used in a professional environment. that's why it has 48v phantom power for your mic as well. it is not your everyday sound card. for those, the gain of mic input is not high enough anyway.  
drwkng
09-02-06
09:40:28
回覆 (83): DIY 自作派同好同學會
my german friend has a new project with the wonderful SABA coax  
 
i was fascinated by the pictures on his website about 2 years ago, and since then we became friends and almost have email exchanged once every few days, sometimes a few emails per day.  
 
I know of the saba and Schulz from his website, and we both like saba so much  
 
He will send me those same wood balls for my saba, nice guy.  
 
 
 
http://www.german-vintage-loudspeakers.com/navid.676/new-speaker-with-saba-coaxial-driver.htm
Welborne
09-02-06
02:35:04
回覆 (82): DIY 自作派同好同學會
why usb? i thought it is a sound card....  
 
btw, i read that in most sound cards with the "mic" input, it has hugh cut off in the bottom frequency and that's why in Carma's menu they recommend using mic preamp and not the "mic" input, but "line" with mic preamp..  
 
is this true?
Welborne
09-02-06
01:27:56
回覆 (81): DIY 自作派同好同學會
roughly how much is the emu0404 sound card and the behringer mic?  
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i think about HK$2k together. don't forget you should buy the usb version.
drwkng
09-02-05
20:05:31
回覆 (81): DIY 自作派同好同學會
sorry, it is Carma from audionet  
 
http://www.audionet.de/main/service/downloads/carma-v30/page.html?L=en  
 
http://www.audionet.de/main/service/downloads/carma-v30/page.html?L=en
Welborne
09-02-05
19:10:08
回覆 (80): DIY 自作派同好同學會
dear drwkng,  
 
thanks for the information.  
 
roughly how much is the emu0404 sound card and the behringer mic?
Welborne
09-02-05
18:56:45
回覆 (79): DIY 自作派同好同學會
I konw there is a free software from audionet called CARA "computer aided room analyzer", but seems it needs set up, and need to buy a calibrated microphone and mic preamp etc  
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i don't know which CARA you are referrring to. the CARA i know is not free and it is not used to measure your room. it is a computer modeling software for room acousitcs. i used to have a copy of CARA but gave that away for lucky draw.  
 
but if you want to do room measurement as i said ETF is good enough. you need a mic and mic preamp. i think the best bet is to get a USB EMU0404. this comes with mic preamp with phantom power. get a behringer 800 mic. you are in business.
drwkng
09-02-05
15:17:44
回覆 (78): DIY 自作派同好同學會
i have been a music lover and only recently starty to cut wood, read websites for technical details etc.  
 
I konw there is a free software from audionet called CARA "computer aided room analyzer", but seems it needs set up, and need to buy a calibrated microphone and mic preamp etc.  
 
I haven't set things up yet. learning...still, need tips from highhand..^^
Welborne
09-02-05
15:04:06
回覆 (77): DIY 自作派同好同學會
anyone know how to use RTA with notebook here?  
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i suppose you know what other hardware required in addition to your sound card..
drwkng
09-02-05
14:37:04
回覆 (76): DIY 自作派同好同學會
anyone know how to use RTA with notebook here?  
 
RTA= real time analyser  
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download a copy of ETF. should have most things you want and more.
drwkng
09-02-05
14:34:08