QUAD ESL 57 A little work on the loudspeaker - Page 10 - diyAudio
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Old 20th March 2017, 07:28 PM   #91
Nemeske is offline Nemeske  Hungary
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Little step happened this weekend. The original FH screws were corroded way too much that I opted to replace them. I sourced again some FH titanium screws (from ACER racing) to do the job. Two problem arised with it: these tags had different thread size than M3, (maybe UNC #4) so I had to transfer these to M3. It wasn't too difficult. My other problem was I could only source FH screw with 6mm the shortest, so I also had to enlenght the holes in these tags. I am sure, these won't start to corrode for the next 200 years...
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Old 21st March 2017, 05:28 PM   #92
Nemeske is offline Nemeske  Hungary
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Completed one bass panel. It was a fun except the stage when one have to pull the wires through the tagboard without puncture the dustcover and broke off the solder post. That was a real pain in the *** work... The funny side was that Quad mustn't had any quality control when they were manufacturing these loudspeakers... The dustcover frames were shorter with a good 3-4 mm than the panels' itself... Anyway, it sings with great rattles at some frequencies, but I am going to remedy that when the panels will be at the frame.

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Old 7th April 2017, 04:18 PM   #93
Nemeske is offline Nemeske  Hungary
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The ordered M3*8mm titanium-aluminium screws and nuts has arrived, so I completed one more treble panel.
This time, I used some mahagony mordant to color the frames. I had to be careful with the amount of water to avoid deformation of the wood.
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Old 7th April 2017, 04:20 PM   #94
Nemeske is offline Nemeske  Hungary
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Also, I painted one side at a time and pinched it together to be sure not to bend the frames
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Old 9th April 2017, 03:02 PM   #95
Nemeske is offline Nemeske  Hungary
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Powder-coated the frame this weekend. There is one more bass panel to go (I ran out of the high tensile hook-up wire). The final assembly is getting real close...
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Old 9th April 2017, 06:09 PM   #96
tyu is offline tyu  United States
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WoW ....lot of great work here on the 57s...thanks for your time an info an the pic...
Vary Vary nice...
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Old 10th April 2017, 03:54 PM   #97
Nemeske is offline Nemeske  Hungary
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Thank you for your attention, tyu! Yes, it has required a lot of work so far... I am trying to refurbish the speaker as analitical as possible but making the smallest changes to the design itself at the same time
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Old 19th April 2017, 08:15 AM   #98
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Do you intend to keep the acoustical damping felt on the rear side? I am interested in your experience with/without it.
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Old 19th April 2017, 08:58 AM   #99
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Originally Posted by lcsaszar View Post
Do you intend to keep the acoustical damping felt on the rear side? I am interested in your experience with/without it.
Personally I think the felt spoils the potential of the speaker. I have had mine since the mid 1980s,and when I first bought them I was disappointed. They had a transparent yet closed in sound, they didn't breath... and the high frequencies were affected by a slighty phasey effect. This was in a room with them well away from the walls which were well damped with curtains behind. I was ready to give them up within a few days and then I remembered reading about removing the felt. I first did the bass panels, and that helped, but it wasn't until I removed all of the felt behind the treble panels that the magic appeared. I couldn't stop listening that night...

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Old 19th April 2017, 11:34 AM   #100
Nemeske is offline Nemeske  Hungary
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Well László, I haven't had the chance to experiment as I had bought the speakers without any felt on the back, not even on the trebles, they were removed and disposed by the previous owner (or owners). However, I always used the speakers at home with some damping the following method: we made a ,,special" thick cover for the speakers out of drape and some damping fabric for covering the speakers when they are not in use. I always put these at the back when they were in use. I liked it because it absorbed the sound somewhat that reflected from the back and made a better stereo image. But I must mention that the speakers sounded way better when I auditioned them at the seller's place. He lived in a house and the speakers were farther from the back wall that I cannot imitate at our flat.

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