電腦數碼音樂重播專欄
影音天地主旨 ﹝請按主旨作出回應﹞  下頁  尾頁 寄件者 傳送日期 由舊至新 由新至舊
[#1] QUAD ESL speaker    

Does anyone know any people in HK to perform checking and service for ESL speaker. The sound level of my of one speaker is much lower. The good news, the charity and tonal balance is still there and we suspect the problem is due to aged electronic part badly needing replacement.

The shipping cost is too high if sending to Germany or UK. Please advise me if you have any idea:

dkyyu@yahoo.com.hk

Dennis
dkyyu
個人訊息 會員
219.xxx.xxx.87
2005-09-04 13:59
[#2] QUAD ESL speaker    
Can't recommand a repair shop. But there is not much in a ESL. You did not say which esl it is. I would check the EHT supply first.
stevey888
個人訊息 會員
24.xxx.xxx.187
2005-09-05 05:51
[#3] QUAD ESL speaker    
Some electrostatic speakers attract dust which may weigh down the diaphram and reduce the output level. You can try to vacuum it through the grill. Make sure you turn it off overnight to discharge it first.
olddude
個人訊息 會員
219.xxx.xxx.206
2005-09-05 09:54
[#4] QUAD ESL speaker    
I met a gentleman living in 將軍澳 several months ago who is an expert & fanatic in Quad ESL. He is an aeronautical engineer & repairs his own ESL, he even knows how to replace the mylar film but unfortunately I lost his contact.
nicknick
個人訊息 會員
203.xxx.xxx.126
2005-09-05 10:09
[#5] QUAD ESL speaker    
Thanks, Stevey888,

My ELS are the original ESL57 probably made in year 1971. I guess one the speaker badly needing EHT replacement or some electrical component changes. Can anyone in Hong Kong provide such a service?


Regards
Dennis
dkyyu
個人訊息 會員
218.xxx.xxx.50
2005-09-05 10:10
[#6] QUAD ESL speaker    
Thank you, olddude and nicknick,

Will try tis weekend.

Regards
dennis
dkyyu
個人訊息 會員
218.xxx.xxx.50
2005-09-05 10:11
[#7] QUAD ESL speaker    
The Quad ESLs has a dust cover to prevent the dust from getting to the mylar. If the dust cover is OK, there will be no dust on the mylar. But if it is torn or loose, you will hear rattles when you play music. So I think your dust cover is OK. Visit the web site below to get some suggestions. Sheldon Stokes' site is particularly useful. If you can not do it your self, may be you can find some one to do it for you. I think you shold change the EHT unit for both side if you want to keep the units. I own a pair of ESL63 with the Crosby mod.
http://www.eraudio.com.au/Kits/kits.html
http://www.quadesl.com/quad_ref.shtml
stevey888
個人訊息 會員
24.xxx.xxx.187
2005-09-05 11:37
[#8] QUAD ESL speaker    
I have more thought on your problem. Because you did not get any rattle sound, so the mylar should be OK and do not have holes that are caused by arc-over. I bet the problem is the EHT circuit.
stevey888
個人訊息 會員
24.xxx.xxx.187
2005-09-05 11:44
[#9] QUAD ESL speaker    
DIY?

http://www.quadesl.org/Fixit_/ServiceManual/servicemanual.html

vt75
個人訊息 會員
219.xxx.xxx.229
2005-09-05 13:13
[#10] QUAD ESL speaker    
.

vt75
個人訊息 會員
219.xxx.xxx.229
2005-09-05 13:19
[#11] QUAD ESL speaker    
.

vt75
個人訊息 會員
219.xxx.xxx.229
2005-09-05 13:26
[#12] QUAD ESL speaker    
The EHT block is easy to make. If you have the later version with them covered in beeswax, you can just melt it and replace the diodes.
If you have the old one with the block encased in epoxy, you can easily fabricate one with cheap parts.

You can check the voltages if you have a high voltage probe so you can verfiy if thelow output is from the EHT or a leaky panel.
mozilla
個人訊息 會員
203.xxx.xxx.140
2005-09-05 15:57
[#13] QUAD ESL speaker    
Dear all,

What more can I say, all of you have been very kind indeed giving me advice.

I think I can summarise the action plan:

1) order diodes for the EHT, I think there are 8 on one side.
2) I am not a electrical man, so I need someone to handle the replacment job. Otherwise, I am pretty sure the high volrage will kill me.

Now, any one in Hong Kong who can sell me the diode and perform the service job for me? Should I post the request in second hand market?
dkyyu
個人訊息 會員
219.xxx.xxx.211
2005-09-05 18:55
[#14] QUAD ESL speaker service    
I met a gentleman living in 將軍澳 several months ago who is an expert & fanatic in Quad ESL. He is an aeronautical engineer & repairs his own ESL, he even knows how to replace the mylar film but unfortunately I lost his contact.

Hello,
If you were this gentleman, will you consider to
give me a hand. My e-mail:

dkyyu@yahoo.com.hk

Dennis
dkyyu
個人訊息 會員
203.xxx.xxx.173
2005-09-06 00:33
[#15] QUAD ESL speaker service    
How about calling Quad's HK distributor and see if they can point you in the right direction? Someone there must know ESL repair since they have to perform warranty repair for the current ESL lineup.

SANECORE LIMITED MS. REGINA WONG +852-25819332 +852-25819717 reginahk@sanecore.com
vt75
個人訊息 會員
219.xxx.xxx.229
2005-09-06 00:41
[#16] QUAD ESL speaker service    
Dennis, do watch out ebay. the EHT block on and off come out for sale from the same seller (from Europe but i couldn't remember the name).
rsbn589
個人訊息 會員
61.xxx.xxx.100
2005-09-06 00:43
[#17] QUAD ESL speaker service    
dkyyu,

Why don't you swap the EHT block between left and right to see the difference, if they are not potted with epoxy. You should change both left and right EHT block diodes and capacitors, no just the diodes.
stevey888
個人訊息 會員
24.xxx.xxx.187
2005-09-06 01:25
[#18] QUAD ESL speaker service    
The diodes and the resistors on the EHT block are the first to drift. The capacitors rarely do but you might as well change them to be sure.

There are 16 diodes, 8 ceramic caps & 2 resistors per block.

Sometimes the voltages in the EHT block are ok but it's a leaky panel that's causing the low sensitivity. Check both.
mozilla
個人訊息 會員
203.xxx.xxx.140
2005-09-06 08:58
[#19] QUAD ESL speaker service    
Thanks a million again for all your valuable advice. Will follow. First thing I must do is to seek for a pair of experienced hands in HK.

One more question, how far you place your ESL speakers apart and any suggestion of speaker distance from rear and side wall in order to obtain the best stereo sound stage and focus.

PS: It appears we have a group of genuine ESL expert and real users in Hong Kong. Hope to meet you and your ESL someday perhaps in very near future.

Dennis
dkyyu
個人訊息 會員
203.xxx.xxx.181
2005-09-06 23:18
[#20] QUAD ESL speaker service    
http://www.geocities.com/drquad@pacbell.net/listening.html

"Dr.Quad's tips on listener & speaker positioning

How are your Quad rears today? Take some time to make sure the loudspeakers are at least 2 feet from the rear wall & that the outer ends are angled (see drawing below) toward you. This positioning will give smoother bass response in the two octaves from 60Hz-240Hz & better high frequencies, at least on axis. The sound stage between the Quads should be better defined too.

All right then, what about the front of the esl? I like a near field listening position for two reasons: 1) the closer one is to the loudspeaker the less the room intrudes and, 2) the Quad is virtually seamless enabling the listener to move surprisingly close to the speaker's grill. Taking into account the narrow sweet spot (caused by mediocre high frequency dispersion), I prefer 7 feet from the center of each esl to the listener. This dimension is based on a stereo spread of about 6' or so from treble panel to treble panel. I hope this increases the boundaries of Peter Walker's famous "window on the orchestra" for you."

vt75
個人訊息 會員
220.xxx.xxx.20
2005-09-07 01:53
[#21] QUAD ESL speaker service    
http://www.geocities.com/drquad@pacbell.net/
vt75
個人訊息 會員
220.xxx.xxx.20
2005-09-07 01:55
[#22] QUAD ESL speaker service    
I like them in an equilateral triangle to the listener. Spread them as wide as you can but leaving at least 1M from the side walls and a lot of room behind them. Nearfield is good. They should be pointed straight at you. It is even better if you can measure the top and bottom of the panel of the ESL's to be equal in distance to your ear.

For clean and tight bass, it is better to raise them to a height of 14-18" from the floor. The stock feet makes them too close to the floor and this influences the mid bass a bit. Some say though that the stock feet makes them sound good with classical music.

Happy listening.
mozilla
個人訊息 會員
203.xxx.xxx.140
2005-09-07 07:44
[#23] QUAD ESL speaker service    
Just to clarify: When I said as wide as possible, my experience is between 5-7 feet. :)
mozilla
個人訊息 會員
203.xxx.xxx.140
2005-09-07 07:50
[#24] QUAD ESL speaker service    
Some say though that the stock feet makes them sound good with classical music.
----------------------

They sound great with stock feet. Don't second guess designer Peter Walker!!
vt75
個人訊息 會員
220.xxx.xxx.253
2005-09-07 17:45
[#25] QUAD ESL speaker service    
>They sound great with stock feet. Don't second >guess designer Peter Walker!!

Thanks for the inputs. Peter Walker is my hero too.
The ESL's were really designed for classical music and they sound really good in this genre.
mozilla
個人訊息 會員
203.xxx.xxx.140
2005-09-09 12:18
[#26] QUAD ESL speaker service    
Hi, everybody,

Just have an expert visiting my ESL today and the problem was, you are right, the EHT, dropping voltage. The expert also examined the panels, both channels in perfect condition without any black spot found. However, I need to order a pair of EHT for replacement. If possible, I'll find a pair of ESL63 as well for comparison.

The expert told me there is a new ESL design coming out this summer but the ESL and 63 till sound much much better than the new comers including the 988/989 series.

Will report once recovery.
dkyyu
個人訊息 會員
210.xxx.xxx.127
2005-09-09 21:32
[#27] QUAD ESL speaker service    
They sound much better to my ears on stands like these.


timtube
個人訊息 會員
218.xxx.xxx.115
2005-09-10 20:32
[#28] QUAD ESL speaker service    
Hi, Tim,

Very nice looking stand, can you advise where to buy these from?

Dennis
dkyyu
個人訊息 會員
210.xxx.xxx.127
2005-09-11 00:09
[#29] QUAD ESL speaker service    
Gingers, rcwy, Tim and all brothers,

I just have both ESL's EHT boards replaced by new units (cost me GBP118) provided from UK One thing Audio. Now the sensitivity resumed and the ESL really sings loud and open with more depth and better stereo image. The ESL sounds like big speaker.

When you have time, call me again for a re-visit.

Regards
Dennis
dkyyu
個人訊息 會員
219.xxx.xxx.254
2005-09-29 19:35
[#30] QUAD ESL speaker service    
Yes those stands look nice. Can you tell us the height?
mozilla
個人訊息 會員
203.xxx.xxx.140
2005-10-07 07:40
主旨內容一共有 269 頁,每頁顯示 30 個信息,選擇頁數:  下頁  尾頁
按照傳送日期顯示:由舊至新由舊至新  由新至舊由新至舊