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Recent content by Barry van O.

  1. Barry van O.

    Revisiting Jim Rogers JR149s

    Short follow up: It's weird but after days of listening and comparing crossovers with different kinds of capacitors, I have to say that the electrolytic capacitors do indeed sound best with these speakers. It's not a huge difference but they just do.
  2. Barry van O.

    Revisiting Jim Rogers JR149s

    I have somewhat of a luxury problem at the moment. In front of me are three sets of crossovers. All the values are the same it's the capacitors that are different. I've used Mundorf E-caps in one set, Expotus & Panasonic metallized polypropylene film capacitor in another set and Clarity Cap...
  3. Barry van O.

    Revisiting Jim Rogers JR149s

    I wonder if the reason for many brands to just use elcaps back in the day because they were dirt cheap. I've even seen a few crossovers where they used filmcaps because they ran out of a specific elcap value. I once used Mundorf M-caps in a set of Kef Corelli's and I didn't like them either for...
  4. Barry van O.

    Revisiting Jim Rogers JR149s

    I've got another pair of red label JR149's with crossovers that need work. Just wondering: has anyone ever tried to use metallized polypropylene caps like Falcon does in their ls3/5a's ?
  5. Barry van O.

    Revisiting Jim Rogers JR149s

    It's been a fun project and they are great speakers. Very detailed, dynamic en fun to listen to. I'm going to sell them on however. So if anyone is interested let me know. My next project will be a diy ls3/5a clone with a Rogers ab1 clone and in the meantime I'm enjoying my latest addition to my...
  6. Barry van O.

    Revisiting Jim Rogers JR149s

    It's been a while since my last post. I've finally finished my JR149 MKI red logo's. One of the speakers needed a new fiberboard bottom cap. There was some damage to them when I bought them but trying to disassemble that speaker further damaged it. So I decided to fabricate new top en bottom...
  7. Barry van O.

    Revisiting Jim Rogers JR149s

    So, it's been a few weeks since my last post. After I upgraded the crossovers to the Gold label crossovers and replaced both B110's I noticed that one of the speakers wasn't airtight. It seemed that there was a slight gap between the top cap made from mdf/fibreboard whatever that is and the...
  8. Barry van O.

    Revisiting Jim Rogers JR149s

    You know what, let's try and figure out what they did with those early crossovers. I can make a compilation using photoshop in the days to come and I can point out the differences. I've also got two friends who have been building their own amps and speakers for years and I'm pretty sure they can...
  9. Barry van O.

    Revisiting Jim Rogers JR149s

    Well they seem to but I'll have to do some testing with a microphone and that program you guys have been using. One thing I haven't mentioned is that I'm surprised to find out how many different layouts and resistor values I've seen on the MKI crossovers. I've seen at least 4 setups. In the end...
  10. Barry van O.

    Revisiting Jim Rogers JR149s

    I spent a few hours last night reworking the crossovers. I wasn't sure to go for electrolytic capacitors or film capacitors and I bought both: A complete set of Clarity Cap PWA capacitors and a set of matched Mundorf Ecaps. Since the consensus at this forum is to stick to electrolytic capacitors...
  11. Barry van O.

    Revisiting Jim Rogers JR149s

    Well, I have to admit I was a bit disappointed yesterday finding out that the crossovers had work done to them but discovering the one of the woofers was rubbish was a real disappointment. I would never have bought them if I had known this.
  12. Barry van O.

    Revisiting Jim Rogers JR149s

    They're a red logo pair and the foam seems to be original:
  13. Barry van O.

    Revisiting Jim Rogers JR149s

    Looks like they're a pair.
  14. Barry van O.

    Revisiting Jim Rogers JR149s

    Just found out the the B110 on the right plays a bit louder and manages to put out a wider spectrum than the B110 on the left.
  15. Barry van O.

    Revisiting Jim Rogers JR149s

    I've decided to take the crossovers out to further inspect them and I removed the front mesh plates to get a closer look at the drivers. What I found out sofar is that both crossovers have resistors with different values. Not just compared to the schematic I got from Tony but they're different...


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