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RE: 2.5 Project

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In Reply to: RE: 2.5 Project posted by jcharris on September 24, 2014 at 10:04:46

Great speakers. When designing your frames, you might like to consider making a frame for the ribbon which is separate to the frame for the bass panel. This stops vibrations from the bass panel shaking the ribbon 'cage'.

My 'Frankenpans' consist of bass drivers from some 2.5s, combined with T-IVa mids & ribbons; the bass driver frame is completely separate to the mid/ribbon frame and when the bass is pumping, you can feel vibrations when holding the top of the bass frame (obviously! :-)) ) ... but you can't feel any on the mid/ribbon frame.

Separate frames deliver 2 additional benefits:

1. You can move one frame forwards or backwards relative to the other, to get the drivers time-aligned. If you have your ribbons on the outside, this means the ribbon frames are slightly forward of the bass frames.

2. The ribbon frames can be arranged at a different angle to the bass frames. I like my bass frames to be almost parallel to the front wall with the mid/ribbon frames (which are on the outside) ointing at my ears.

Regards,

Andy

Follow Ups:

RE: 2.5 Project - jcharris 07:09:31 09/25/14 (0)
Thanks for the suggestion Andy. When I decided to move forward on this one of the first things I did was to search and reread your posts from your build process. A couple of things escaped me but all 'n all, they were helpful.

As to your suggestion to seperate the tweeter out, I'm afraid that wont be happening. For one, I'm actually doing this as a gift for my bro-in-law. He'll be more than happy with things the way it is planned. And to that, I'm keeping my costs as reasonable as possible.

I should be done with the frames this weekend and will post some pics (if I can figure out how!)
The ol' swiveling tweeter trick, huh? You're too close to the ozone hole! - JBen 14:38:51 09/24/14 (5)
Oh well, could have been worse if you lived further south, in Melbourne, not to mention Tasmania. LOL!

But wait! Mr Bose did it also...hmmm...was it the 301?
- I *am* in Melbourne, mate! ... - andyr 14:48:38 09/24/14 (4)
  But, yes, Tasmanians are generally pretty weird! :-))
  
  The 2-frame construction is the main reason I wouldn't swap my Frankenpans for 20.Xs - even if I could afford them (which I can't!).
  
  Andy
  - RE: I *am* in Melbourne, mate! ... - JBen 15:04:50 09/24/14 (3)
    Yeah, I know. Just wanted to kick start some nationalistic fervor. LOL!
    
    At the high resolving levels of (well-fed) ribbon tweeters, I have to agree. Anything one can do to "leave them alone" in the framework has got to be a good thing.
    
    Tell me again (the old brain cell misfires), what's the amp that drives just the tweeters these days?
    - Ribbon amps ... - andyr 15:53:56 09/24/14 (2)
      no change, yet, JBen. I have had the new mid & ribbon amp modules (NAKSA 80s) sitting in a box since Jan but have not got around to fitting them - mainly bcoz I will need to take 2 weeks off, to be able to finish them on consecutive days ... rather than being without music for 3 months, if I can only do them at weekends.
      
      Regards,
      
      Andy
      - RE: Ribbon amps ... - neolith 18:39:38 09/24/14 (1)
        
        In Reply to: RE: Ribbon amps ... posted by andyr on September 24, 2014 at 15:53:56
        
        So sorry that you are about to come down with Audiophile Flu. I am sure your boss will understand that you just can�t work for the next two weeks. If you want, I can provide a doctor's note :).
        �
        
        �
        
        Edits: 09/24/14
        
        If you want, I can provide a doctor's note :) ... - andyr 01:38:17 09/27/14 (0)
        
        In Reply to: RE: Ribbon amps ... posted by neolith on September 24, 2014 at 18:39:38
        
        Actually, neo ... I do have that doctor's note (for reasons that I won't go into, here! :-)) ) Only for this next week, though.
        
        Regards,
        
        Andy

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