1. Time for some upgrades in server hardware and software to enhance security and take AK to the next level. Please contribute what you can to sales@audiokarma.org at PayPal.com - Thanks from the AK Team
    Dismiss Notice

Canton Quinto 540

Discussion in 'Speakers' started by Tony124, Jun 4, 2018.

Tags:
  1. Tony124

    Tony124 Member

    Messages:
    59
    Location:
    Mannheim, Germany
    Hi James,

    many thanks for the very informative reply.

    Strassacker doesn't have Elko Mundorf unetched 18 ųF. Is it ok to use a MKP or MKT cap instead?

    Are the MKP/MKT caps always better than Elkos? Or should I stick with the Elkos because that's what the the original are?

    Regards,
    Tony
     

     

    Please register to disable this ad.

  2. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

    Messages:
    4,146
    Location:
    Munich, Germany
    Sure, you can use MKP or MKT for the 18µF. They are a good bit larger than elco's tho. Or you can use a 12µF elco with a 6.2µF film in parallel (or a 10µF+8.2µF). The slight extra 0.2µF will make no difference. I've done that and it works just fine.

    Film caps offer more clarity and less ESR when used directly in the signal path (such as for the tweeter and upper end of the mid) but don't really bring anything extra when used in parallel (such as the lower end of the mid and for the woofer), other than lower ESR.

    One advantage of film caps is that they will never drift or change in value like elcos slowly do.

    Cheers,
    James
     
  3. Tony124

    Tony124 Member

    Messages:
    59
    Location:
    Mannheim, Germany
    Hi James,

    I finished recapping and redoing binding posts for one Quinto 540 box last night. Your previous Quinto threads have been very helpful and saved me a lot of time/hassle. Thanks a lot.

    I still cannot decide how to go with refinishing; ideally I would go with some compromise which is not very time-consuming. For example I would start with aceton, then some very light hand sanding. And apply it to the top sides only.

    Regards,
    Tony
     
    Bratwurst7s likes this.
  4. Tony124

    Tony124 Member

    Messages:
    59
    Location:
    Mannheim, Germany
    Hi James,

    so I have finished the second box as well. Now the only remaining task is refinishing.

    Which color of Osmo Hardwax Oil would you recommend? It looks either Honig (3071) or Bernstein (3072) would be closest to the original?

    Regards,
    Tony
     
  5. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

    Messages:
    4,146
    Location:
    Munich, Germany
    I've been using 3032 Farblos Seidenmatt (colorless semi-gloss for English readers [heh, heh. I almost wrote "for English speakers", but that might get confusing in a speaker thread ;)]).
    The results have actually been pretty much just like the original finish.

    Cheers,
    James
     
  6. Tony124

    Tony124 Member

    Messages:
    59
    Location:
    Mannheim, Germany
    Hi James,

    I have the same issue with my Quinto 540. Can you please give a hint how you applied the double-stick tape? Use very thin tape, cut into small pieces and apply a piece at each hole?

    Regards,
    Tony

     

     

    Please register to disable this ad.

  7. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

    Messages:
    4,146
    Location:
    Munich, Germany
    Hey Tony, I just looked through all of my old photos and found that I didn't actually take a single shot of using the tape. But basically...

    What I have is 1/2" wide, so 12.7mm, anything around 10-15mm wide will work. I just cut small strips ca 2cm long and laid them down on the woofer cutout on each side of each screw hole and every 4-5cm in between. Then I took the seal and starting with a section that way originally correctly installed over one of the screw holes (based the woofer frame impressions) and carefully placed it in the cutout. Then I worked it down in place around the ring. The areas of the seal that were deformed sometimes needed some extra pieces of tape to get it to hold in position long enough to get the entire ring where it was supposed to be.

    It can be a bit frustrating because the double-stick that I have didn't stick to the wood real well and so it came loose a few times in spots and had to be re-worked. And of course trying to press the tape onto the wood with my fingertips was even more frustrating because it stuck to my fingers better than the wood. In the end I stuck the tape to the corner end of a small flat top screwdriver, laid it down, and used the tip a second small screwdriver to get it so stay in place. Heh heh, it takes some playing around but it just has to hold long enough to be able to drop the woofer in place.

    Of course I had to do all of that before(!) soldering the wires to the woofer, because, yeah, doing it the other way around just doesn't work. :);) And I had to be real careful doing that and dripping the woofer carefully in place. And of course I did manage to dislodge the seal once when soldering the wires.

    But in the end it worked. It sounds harder than it really was. I considered using some small drops of rubber cement to hold the seal in place but the double stick worked and I didn't really want to glue the seal down. I think that if you ever have to remove the seal later without destroying it that will be easier to do with the small pieces of tape than glue.

    I have at times also just bought 2mm and 3mm thick closed cell foam from Modulor and cut new seals.
    https://www.modulor.de/kunststoff/weichschaum/moosgummi-zellgummi/
    Hint: if you do this using a color other than black helps. I know this because I first bought black and then realized that I only had a black Sharpie to mark the foam for cutting. :( Guess how well that worked. And a white ink marker was stupid expensive.

    Cheers,
    James
     
    Tony124 likes this.
  8. Tony124

    Tony124 Member

    Messages:
    59
    Location:
    Mannheim, Germany
    many thanks James for the excellent guide. I will try it out and post the result.

    Regards,
    Tony

     
  9. Tony124

    Tony124 Member

    Messages:
    59
    Location:
    Mannheim, Germany
    Hi James,

    do you recommend making new seals over using the original seals?

    Regards,
    Tony
     
  10. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

    Messages:
    4,146
    Location:
    Munich, Germany
    Well, if the seals are still servicable, not torn etc I've been re-using them with no problems. I only cut new ones when I have to. I suppose go with whichever is easier for you.

    When I do cut new ones I just use a couple of small cable ties to fix a marker pen to my compass, measure, mark and then hand cut with an X-acto knife. I also have a pair of very sharp short blade curved surgical scissors and they work pretty good, but my experience is that trying to cut the foam with the average scissors is a pita.. To mark the mounting holes I lay the seal in place and carefully shove a round toothpick through each hole from the top. Then I use the marker pen to push the toothpick the rest of the way through the hole leaving a nice mark where the hole is. A 4mm hole stamper and hammer comes next and you are done.

    Cheers,
    James
     
  11. fredeb

    fredeb New Member

    Messages:
    30
    Location:
    Cape Town ; South Africa
    I'd love to hear your listening impressions .

    Fine work indeed !
     

     

    Please register to disable this ad.

  12. Tony124

    Tony124 Member

    Messages:
    59
    Location:
    Mannheim, Germany
    I'd post an update on the project.

    - removed film finish with acetone,
    - some light sanding with an orbital tool,
    - 2x Osmo Hardwax Oil painting,
    - recap
    - replaced post binding

    Here are some photos. I hope to post more later.


    - IMG_1046.jpg IMG_1047.jpg
     
    Bratwurst7s and Old Guy8 like this.
  13. Old Guy8

    Old Guy8 AK Subscriber Subscriber

    Messages:
    3,930
    Location:
    Rockford, Illinois
    Nice work. Will be well worth effort. I enjoy my Karats every day.
     
    Last edited: Nov 6, 2018
  14. r_brumett61

    r_brumett61 Active Member

    Messages:
    368
    Location:
    Ct
    Great job!
     
  15. Bratwurst7s

    Bratwurst7s In The Frying Pan Subscriber

    Messages:
    4,146
    Location:
    Munich, Germany
    Beauty! Really nice work. I'm looking forward to seeing the finished speakers.

    Cheers,
    James
     
  16. fredeb

    fredeb New Member

    Messages:
    30
    Location:
    Cape Town ; South Africa
    Looking good !
     

     

    Please register to disable this ad.

  17. Tony124

    Tony124 Member

    Messages:
    59
    Location:
    Mannheim, Germany
    update: last night I put the boxes together.

    I got it wrong 2x:
    - left 1 fiber filling pad out of 1st box, recognised after having closed everything (ouch!)
    - crossover mounted on the wrong side in 2nd box, also recognised after having closed everything (ouch!)

    There was also some fighting with putting the drivers back; as @Bratwurst7s pointed out, it's not that easy to get the seal for the woofer in the correct place. It was also tricky to put the heavy woofer in place without moving the seal. In the end this method worked for me: use some string to lift the woofer in balance, use a small screwdriver to guide the woofer to the correct position before putting it down, then cut and pull the string out.



    IMG_1096.jpg IMG_1097.jpg
     
    Old Guy8, Bratwurst7s and larry777 like this.
  18. Don't you just love it when a plan comes together ! Great job on these speakers.
     
  19. Tony124

    Tony124 Member

    Messages:
    59
    Location:
    Mannheim, Germany
    thanks for the nice comment. Actually I have difficulty to find time for this hobby, but last night I could not wait anymore and found an excuse: I was working hard for the whole day, even did some sport in the evening and hence can afford myself to tinker with my Quinto boxes a bit before going to bed. Ended up going to bed at 00:30 am.
     
  20. Tony124

    Tony124 Member

    Messages:
    59
    Location:
    Mannheim, Germany
    IMG_1082.jpg IMG_1112.jpg IMG_1113.jpg IMG_1114.jpg IMG_1115.jpg IMG_1102.jpg IMG_1106.jpg IMG_1107.jpg IMG_1117.jpg

    I'd like to update the progress with some more photos. One box looks slightly darker than the other, but I am ok with it. I don't expect too much from my first restoration project.

    I tested the speakers with my current amp Technics SU-V6X. They sound better than my previous speakers (Magnat Vector 55), however I noticed in the threads by @Bratwurst7s that a powerful amp is required to drive those Quintos. So I was keeping my eye on it and it just happened that I got a Yamaha AX 1050 last week in relatively good condition. I don't have the time to recap, so just did what I could for now: dry cleaning and deoxit.

    The amp makes a big difference indeed. Very clear and warm sound at low/mid volume listening. Maybe I will recap the amp when I have time in the future, but for now I am quite happy with this combo already.

    Needless to say, I have been copying very much what @Bratwurst7s did to his Quintos (and the choice of Yamaha AX amp to drive them). Sincerely thanks for your help and sharing your experience.

    Regards,
    Tony
     
    Old Guy8 and Bratwurst7s like this.

Share This Page