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Jordan Eikona 2 VTL enclosure
Jordan Eikona 2 VTL enclosure
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Old 16th August 2017, 07:46 PM   #1
sheiron is offline sheiron  United Kingdom
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Default Jordan Eikona 2 VTL enclosure

At the risk of being laughed off this forum,I would like to share some thoughts on the Eikona 2 and the VTL. I have had my Eikonas for about 6 months, and have tried various enclosures, but have not been happy with any of them. I decided to try the VTL from the Jordan website, though my version was 30mm shorter due to height restrictions. I was impressed with the bass extension, but not with the nasty resonance around 150Hz triggered by male voices and the lower string instruments. I spent 3 months experimenting with damping materials in various configurations, but was unable to eliminate it. About to give up on it, I remembered something I came up with over 60 years ago..Corrugated paper tightly rolled into a cylinder forms dozens of parallel tubes which allow sound to travel through it, acting as a kind of waveguide. If fitted into a transmission line, sound from the rear of the speaker will be conducted to the exit unable to bounce off any interior surfaces. If the path is long enough, the higher frequencies will be lost. I modified my VTLs in this way, cutting the tube at 45 degrees where sections intersect to form a sort of U bend. I can now listen to Shostakovich without the annoying colouration.I'm sure this system can be used in other enclosure designs with advantage.
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Old 16th August 2017, 10:23 PM   #2
planet10 is offline planet10  Canada
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Jordan Eikona 2 VTL enclosure
The VTL is not a very good TL. By using the paper rolls you have essentially turned it into an aperiodic enclosure.

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Old 18th August 2017, 03:58 PM   #3
Colin is offline Colin  United Kingdom
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Hi Sheiron - The VTL is designed to be used as specified on the plans and we have many happy constructors. The VTL is a coupled cavity TL, a design principle Ted had worked with regularly from the late 1960s onwards. It shouldn't require the cardboard filter. If it did, Ted would have designed it in (he patented a design of aperiodic enclosure whilst at Goodmans in the late 1950s.)

I think Proac did something similar with their speakers, many years ago, stuffing the reflex ports with drinking straws.

When you say you reduced the height, I assume that this only refers to the stand rather than any part of the enclosure itself? Have you tried modifying the wadding used in the cavity behind the Eikona? And can you confirm that it isn't a room effect?
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Last edited by Colin; 18th August 2017 at 04:03 PM. Reason: extra info
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Old 18th August 2017, 04:45 PM   #4
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by sheiron View Post
I have had my Eikonas for about 6 months, and have tried various enclosures
Which enclosures have you tried and what is your verdict on each?
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Old 18th August 2017, 07:12 PM   #5
sheiron is offline sheiron  United Kingdom
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Hi, Scottjoplin, I first tried them in the enclosures which I had used for the JX92, a sealed box. I also tried a discarded sub-woofer cabinet, and other enclosures that I have accumulated. I have not tried any enclosure designed for the Eikona apart from the VTL which I had to slightly modify.
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Old 18th August 2017, 07:30 PM   #6
scottjoplin is offline scottjoplin  Wales
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I have Eikona VTL and had a problem with a peak, I'm guessing around 200Hz, this was cured by placing them flat against the front wall (the ideal position for them?) and farther away from the corners, it was a room reflection. How do you have yours placed? BTW, I'm a big Shostakovich fan
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Last edited by scottjoplin; 18th August 2017 at 07:33 PM.
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Old 18th August 2017, 08:33 PM   #7
sheiron is offline sheiron  United Kingdom
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Hi Scottjoplin, Interesting that you noticed a peak, I wonder if yours was cured, or "cancelled out" by moving the enclosures - just a suggestion. My resonance stayed wherever I put the boxes....even flat on their backs on the carpet. Again, after fitting the paper rolls, I can put them anywhere without a problem
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Old 18th August 2017, 09:13 PM   #8
scottjoplin is offline scottjoplin  Wales
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Well, definitely sounds like a different issue, how did you modify the cabinet height wise?
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Old 18th August 2017, 09:17 PM   #9
sheiron is offline sheiron  United Kingdom
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Default Jordan Eikona 2 VTL

Hi Colin, I want to make it clear that my post was not in any way, a criticism of Ted's design. I had the pleasure of meeting him way back in the 'sixties. and spoke to him on the 'phone subsequently. I have used his speakers over the years, starting with the Jordan Watts module, the JX92, and now the Eikona. I mentioned in my post that I had reduced the height of the VTL by 30mm.- the enclosure itself. I accept that this may have contributed to the resonance. Yes I did try variations of the padding behind the speaker, including doubling the thickness, as the magnet was not in contact with it as shown in the diagram. For this reason also, I added "front to back" braces close to the speaker. With regard to " room effect" I can only say that the boxes are in the same position as they were....nothing has changed except for the addition of the paper tubes, which in my case were a great improvement. Thank you for your interest.
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Old 18th August 2017, 09:25 PM   #10
sheiron is offline sheiron  United Kingdom
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I kept the cavity dimensions exactly as the drawing...I adjusted the baffle length to maintain the cross section area.
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