Adding Ribbon To Jx92s - diyAudio
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Old 10th July 2008, 11:15 AM   #1
smithie is offline smithie  United Kingdom
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Join Date: Jan 2005
Location: cornwall
Default Adding Ribbon To Jx92s

hi
im going to build the mltl 48 enclosure for my jx92s and was also thinking adding later the ribbon tweeter that jim has kindly shared his plans and results with.
im of the school that less is more,ive always felt that the jx92s could do with a bit more treble air and space,and have always love the ribbon sound so im quite keen to try this set up...now heres my worry...does the crossover needed to do this distory the magic of the crossoverless jx92s(i always think the best crossover is no crossover )
im hoping you guys that have done this mod can shed some light and your finding on this,also how much does the crossover rob the design effeincy wise...im using valves so every watt counts!
any help/views guys would be much appricated.
all the best
smithie
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Old 10th July 2008, 01:06 PM   #2
bluegti is offline bluegti  United States
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I have recently built Jim's design with the G2si tweeter and cannot be happier. For all the things that the Jordon does well, I think it is even smoother with the tweeter.

I brought them to a local audio meeting back in February and everybody agreed they sounded very very good.

I cannot speak to exactly how the crossover effects the efficiency, but when we tried to drive them with low powered SET, they didn't not sound very good at all. We ended up using an 8 watt (I think) KT88 in ultralinear that sounded nice with them. I'm currently building some chip amps to power them, but haven't heard them with more power yet.
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Old 11th July 2008, 01:14 PM   #3
RonD2 is offline RonD2  United States
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If you hook-up each driver separately to a dual binding post and keep the crossover external, its easy enough to switch back and forth.

Personally, I prefer it with the ribbon.
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Old 11th July 2008, 05:03 PM   #4
smithie is offline smithie  United Kingdom
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hi guys
thanks for the replies.
i know i could wire it to compare with and without,but what im trying to conclude is weather its worth the investment in the ribbons etc,and moding the cabinets before taking the plunge and going to the expense!
as ive said i love ribbons and i believe the jx needs alittle beefing,air in the treble,but i wouldnt want that at the expense of losing that glorious open transparent and detailed midband that im afraid a xover may bring..thats why i wondered if anyone had compared xover vs xoverless sound quality on the jx.
all the best
smithie
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Old 11th July 2008, 05:50 PM   #5
RonD2 is offline RonD2  United States
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I don't think the midrange magic is lost using the crossover and tweeter. Maybe its hard to believe but I think it is improved. In addition, highs are smooth and extended. Bass is tuneful and full.

About the only negatives I can see are the added cost and loss in efficiency.

I have a SB2-Buffalo-Ivy-F4 driving it and the gain is still adequate in a medium size room.
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Old 11th July 2008, 08:04 PM   #6
smithie is offline smithie  United Kingdom
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hi
thanks for that,thinking harder on it the only way im really going to know is to try it and see,if i dont then ill always be wondering either way ....cant anything be easy in this hobby!
so any ideas where i can source these tweeters in the uk? the only option i can see at the moment is parts express.
all the best
smithie
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Old 12th July 2008, 12:49 AM   #7
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Default Jordan with a Ribbon Speaker Sensitivity

A few comments on the sensitivity of my Jordan with a Ribbon design. Both of the mini-monitor and MLTL 'with a ribbon' designs use the same crossover. Inherent within that crossover is approximately 3-4 dB baffle step compensation so the overall sensitivity is in the 85-86 dB SPL area.

Now you can implement the same speakers without the ribbon. But you will have to include a typical baffle step comp circuit if you wish to correctly balance the sound across the frequency band. Thus you are back to the exact same sensitivity levels once you dial in the BSC.

In fact my MLTL prototype of the 'Jordan with a Ribbon' design has a switch so I can toggle between the ribbon with the crossover (with its inherent baffle step) and just the full range driver with a separate baffle step comp circuit. Both configurations have essentially the same output level for the midrange area so you hear the same output level when you switch between them.

My finally sensitivity point is that you can clearly compensate for the baffle step with other techniques but you are limited by what the Jordan driver can produce. That is typically in the 88-89 dB SPL area.

My listening observation is that the mid-range 'magic' of the Jordan is maintained with both the with and without the ribbon design. But the tweeter version does have smoother treble response than the JX92S run full range.

Jim
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Old 12th July 2008, 09:37 AM   #8
smithie is offline smithie  United Kingdom
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hi jim
thanks for your input.
just one question,was going to build the 48" versions(triangle version) but i was going to add a wider front baffle inline with teds vtl version,would i still need the baffle step compensation circuit of yours if i do that?,there going to go up against the wall,corner also.
thanks for your views regarding the mid-range also plus your virew regarding the treble,that bit sounds just what im after!
all the best
smithie
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Old 12th July 2008, 12:11 PM   #9
RonD2 is offline RonD2  United States
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Just wanted to add that the comparison I made was between the Jordan run alone, without any BSC, versus the combination with compensation per Jim's crossover design. Undoubtedly an unfair comparison.
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Old 12th July 2008, 12:46 PM   #10
Colin is offline Colin  United Kingdom
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Smithie - you would needed slightly different BSC component values with the wider baffle. The VTL values on the Jordan site are

R - 4.0 ohms
L - 2mH

There is a baffle step calculator website, which allows you to calculate values. Can't find the web ref at the moment so someone else may chime in.

I was sceptical about BSC with the triangles until I tried it on mine and it does balance out the sound, getting rid of a leaness in the mid-bass.
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