B&O C30 Rebuild
xschop
Posts: 5,000
Opened these up to find another crossover surprise. The manual is showing the same 6.8uf cap as the CX100's I just restored.
I found another reference/comment that the C30s had 2 caps 8uf and 15uf.
Possible B&O changed the crossover design mid-production?
Strange, but true..
I found another reference/comment that the C30s had 2 caps 8uf and 15uf.
Possible B&O changed the crossover design mid-production?
Strange, but true..
Don't take experimental gene therapies from known eugenicists.
Comments
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So manual has a different schematic than above with only a 6.8uF cap for the tweeter and no cap for the midwoofer?
The schematic you drew above is a basic 2nd order high pass and low pass.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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That's another weird one, at least with my limited experience. Except for the tweeter and midwoofer being partially in series, it would be a basic 1st order low pass and high pass. How much current would make the path only through the tweeter and woofer in series and what is the purpose of that?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 -
Not sure, these are only rated at 30W, hence C30. C40's rated 40W.
Going sell these when done, so ordered Yellow Dragons for them.
Think the factory resistors are worth upgrading to new wire-wound? They ohm out exactly 4.7 ohm...
Don't take experimental gene therapies from known eugenicists. -
These guys are actually time-aligned and the midwoofer is positioned on top.
Don't take experimental gene therapies from known eugenicists. -
Will button these back up and have a listen with just the foam frame mod and new butyl surrounds when they arrive....
Don't take experimental gene therapies from known eugenicists. -
Butyl damping the enclosures and the transmission line baffles...
Refurb'd the tweeter diffusers...
Made new PVA gaskets for tweeters since they are an alloy bezel plate...
Post edited by xschop onDon't take experimental gene therapies from known eugenicists. -
Yellow dragons finally showed up along with the new 4.7 ohm wire-wound resistors...
After some digging, I found that these are Seas tweeters. Still can't find a diagram with these components however.
Don't take experimental gene therapies from known eugenicists. -
Is that Copper piece on the large inductor working as a Faraday shield? I was thinking it is a no no to orient the inductors the same way but that could take care of it maybe.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 -
I believe so. The Germans had the inductors this way, so they're staying put. More strangeness, but they did come up with Die Glocke ya know.Don't take experimental gene therapies from known eugenicists.
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Burning in the Yellow Dragons. Sounding smooth and balanced after just a few hours at garage listening levels...
Don't take experimental gene therapies from known eugenicists. -
This little Class D amp puts some good punch into these, but they would still need a sub. They drop off about 70 HZ, but fill the 16x16 master bedroom without having to crank them up much...
Don't take experimental gene therapies from known eugenicists. -
They are cute and wife friendly.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 -
Downright dainty transducers.
Don't take experimental gene therapies from known eugenicists. -
Brought them up to the shop to run with the Polk sub in the corner.
For near-field, raised at ear level they don't disappoint. 👍
Don't take experimental gene therapies from known eugenicists. -
Do they sound different with the grills?
Neato project.The Thrifty Setups in Mah House Big thrifty stereo in the basement w/ my custom SDA-1C (built with help from kind forum members) * Beautiful 1966 MCM GE console upgraded w/ Bluetooth, Dual turntable, and Paradigm speakers in family room * Swanky 1980 Realistic system and great TEAC eq with dancing colored lights in the living room * custom 5B on a system for my Dad * Ye Olde college stereo in the garage -
A touch lower dB, but balanced. And I did do the full monty on the basket mods too for time sake.Don't take experimental gene therapies from known eugenicists.
