B&O CX100 crossover enigma

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  • xschop
    xschop Posts: 5,000
    Send me the midranges, I'll plug 'em and paint them neon orange if you'd like.
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  • ChrisD06
    ChrisD06 Posts: 929
    xschop wrote: »
    Send me the midranges, I'll plug 'em and paint them neon orange if you'd like.

    I don't have any YET lol, that's why I mentioned I wish I had them.

    This is an offer I will take up if I ever find some.
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  • xschop
    xschop Posts: 5,000

    Wish I lived near NJ :) I forgot these came in brushed alloy from the factory...


    https://www.ebay.com/itm/235317160334?_trkparms=amclksrc=ITM&aid=1110013&algo=HOMESPLICE.SIMRXI&ao=1&asc=20201210111452&meid=cb3e0734084c47b18e4e0f8e7cb380da&pid=101196&rk=1&rkt=11&sd=325518477630&itm=235317160334&pmt=1&noa=0&pg=4429486&algv=PromotedRVIPbooster&brand=Brand&_trksid=p4429486.c101196.m2219&amdata=cksum:235317160334cb3e0734084c47b18e4e0f8e7cb380da|enc:AQAIAAAA8JsbtOKd5uIU0OgsJNCgXCOEhgDqSK02SR6zRfZfJgWYkvkEgwHaKMvmoegObME1jYhGMjur2u3zVBf6w0rfbtJntecxeFr%2BTDCAXT3FbTl88UKvAYnWJEibunkdWF%2BAaonmn9X5nV8P2oqFvJuizthZCItuhE3U6sW%2F5pJQ%2BFI5WD6Cy2HrKXqShNisF%2Fa5CG0DO3ogH9TwmZnYT6vsVkGFOeA7VyYH6WKy6b8%2F4o4h3vH9KuQn0oCDwo0vG9GdPTcmnhZuACTzZX%2BPNo7Yc7jYqKjIO0%2Fa%2B2XFopvF7TYIvlL6c%2FijBP5rr9AV3bvKVg%3D%3D|ampid:PL_CLK|clp:4429486
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  • xschop
    xschop Posts: 5,000
    Round 2....

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  • xschop
    xschop Posts: 5,000
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    Don't take experimental gene therapies from known eugenicists.
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  • xschop
    xschop Posts: 5,000
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  • xschop
    xschop Posts: 5,000
    edited March 11
    Made a set of snub-nose phase plugs for these mid ranges and installed another set of Clarity PX caps with new internal wiring....

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  • xschop
    xschop Posts: 5,000
    The black anodizing on this particular set was damaged by previous owner, so I’ll make them with the brushed alloy patina… Over the years I’ve used NaOH solutions, but have found heavy duty oven cleaner works great with 2 applications…

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  • xschop
    xschop Posts: 5,000
    edited March 12
    The other midrange coil was fried, so I unwound a 25.5mm ID 6.5ohm coil down to 5.2ohm to match the other midrange driver. Cut to 0.950″ total length with 0.44″ coil length to match as well. Glued in and set with shims leaving wires close to ferrule attachment points for soldering….

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    Post edited by xschop on
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  • xschop
    xschop Posts: 5,000
    edited March 26
    Tired of the foam I had under them to angle up at the desk....

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    Post edited by xschop on
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  • xschop
    xschop Posts: 5,000
    Finally got around to doing the millwork on the rear covers...

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  • xschop
    xschop Posts: 5,000
    Got time to finish these today. Went with cross-hatch fly-cut. Will install these in my desk-top 100's this weekend...

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  • VR3
    VR3 Posts: 28,729
    Beautiful!

    Love the idea on the bars for the angle adjustment
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • xschop
    xschop Posts: 5,000
    Thanks Trey...
    I omitted the thin sheet metal bracket mounts as they’ll be attached and sealed with polyurethane rubber adhesive. This will mitigate any resonance at the highest volumes….
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  • Gardenstater
    Gardenstater Posts: 4,497
    I had to go back to page 1 to refresh my memory. This is the before? What is the material....plastic?

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    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • xschop
    xschop Posts: 5,000
    Yes. Think RD0194/8 plastic :# . Even with the butyl mat, it makes a hollow sound when rasped on. The alloy enclosures with butyl mat are solid.
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  • xschop
    xschop Posts: 5,000
    edited July 7
    Finally got a weekend day to reassemble the new covers. Had to grind down the factory ABS crossover mounts to clear the alloy crossbraces.
    I like the nickel plated binding posts with the patina. Added 4×4×5/8" open cell foam top and bottom directly behind mids as well. These added a couple lbs. to the build.

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  • Gardenstater
    Gardenstater Posts: 4,497
    Any discernible sound signature change, or do you not have enough listening time yet?
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • VR3
    VR3 Posts: 28,729
    edited July 8
    A block aluminum like that maybe sure you are an inch or more away from coils turned on their side and maybe 2 inches for ones laying flat
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • xschop
    xschop Posts: 5,000
    Another delay unfortunately. Will have to install when I get to the shop as our dryer threw a drum roller. Sounded like a full auto mini 14. Luckily Bezos had a rebuild kit with new belt and tensioner over-nighted.

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  • xschop
    xschop Posts: 5,000
    edited July 9
    Had to go back and clearance the instep on one plate because it was off a 16th an inch from the other that was mic'd for the tech drawing. decided to go with clear poly adhesive in a syrine for easy cleanup.

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    I'll clean with mineral spirits when the glue dries...
    RM-1000 hiding out back there.

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    Post edited by xschop on
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  • xschop
    xschop Posts: 5,000
    I A-B'd them before installing 2nd plate. Clearly no vibes coming from new back panel and it tightened up the enclosure itself. Had another shop friend have a listen to Steely Dan's Black Cow. He said he could also clearly hear difference in the mid-bass between plastic one and solid alloy one. Gluing 2nd one up now.
    Don't take experimental gene therapies from known eugenicists.
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  • xschop
    xschop Posts: 5,000
    Thought I'd post a pic of another modder's CX100 build. He cracked out the foam and Dremel...

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  • BlueBirdMusic
    BlueBirdMusic Posts: 2,305
    xschop, you never cease to amaze me with your investigations.
    "Sometimes you have to look to the past to understand where you are going in the future"

    Anger is just anger. It isn’t good. It isn’t bad. It just is. What you do with it is what matters.
    You can use it to build or to destroy. You just have to make the choice.     Jim Butcher




    Harry / Marietta GA
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  • xschop
    xschop Posts: 5,000
    Thanks Bird, but that wasn't my rabbit-hole detour. I did like his frame window mod the most.
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  • xschop
    xschop Posts: 5,000



    Re: Bang & Olufsen Beovox CX100 Speaker Modifications
    « Reply #11 on: Today at 01:39 pm »
    Quote
    Quote from: xschop on Today at 12:44 pm
    Well, do we have a verdict on the frame window/foam mods?

    Here’s the verdict… Crazy holographic 3d imaging. Zero cabinet coloration. Treble is vastly improved and much smoother. The bass response is very slightly more extended than before, but ultimately it is still too bass light overall. I think that at some point in the future, I will be sending them to Danny Richie to see what he can do with them.

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  • SCompRacer
    SCompRacer Posts: 8,504
    You got skillz! When I work with metal, what I envision never transpires....lol
    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ * Signature Series Sonore Music Server w/Deux PS * Roon * Gustard R26 DAC / Singxer SU-6 DDC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 *
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  • xschop
    xschop Posts: 5,000
    You got mad electronic skills B) When I get some time I can re-cap my old Scott receivers and pick your brain about DC offset stuff.
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  • xschop
    xschop Posts: 5,000
    xschop wrote: »


    Re: Bang & Olufsen Beovox CX100 Speaker Modifications
    « Reply #11 on: Today at 01:39 pm »
    Quote
    Quote from: xschop on Today at 12:44 pm
    Well, do we have a verdict on the frame window/foam mods?

    Here’s the verdict… Crazy holographic 3d imaging. Zero cabinet coloration. Treble is vastly improved and much smoother. The bass response is very slightly more extended than before, but ultimately it is still too bass light overall. I think that at some point in the future, I will be sending them to Danny Richie to see what he can do with them.

    I just realized he changed the cap value to 5uf from 6.8uf to tame the tweets. This would be a no-no, no?
    Don't take experimental gene therapies from known eugenicists.
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