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RE: Tri-amping T IV-A's with tubes?

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In Reply to: RE: Tri-amping T IV-A's with tubes? posted by AkuAnkka on December 03, 2024 at 01:23:09

Yes, the mids/tweeters do need a fair bit of power and the impedance is rather low. I have seen them driven by Krells on the basses and Audio Research on the rest, not sure what model, maybe D-90. If the tweeters are padded down (with a series resistor) their impedance will not be a problem for most tube amps. Padding down will be a must if you go for foil on the mids (it lowers the output on them).

My mids are still not fixed... I will need a replacement of the Mylar as well.

Follow Ups:

RE: Tri-amping T IV-A's with tubes? - josh358 13:14:51 12/03/24 (6)
Why not go with the Neo 8 clones? They slot right in to the existing baffle.
- RE: Tri-amping T IV-A's with tubes? - AkuAnkka 00:08:48 12/04/24 (5)
  Which clones exactly do you mean? I thought that NEO8's or any similar drivers are not available anymore...?
  - RE: Tri-amping T IV-A's with tubes? - josh358 11:06:00 12/04/24 (0)
    The clones are apparently pretty good, they've been compared side-by-side. Emailtim here has some.
    
    In one way they're better -- their impedance is 8 ohms so you can make the line come out to 4 ohms. Not that it's super important given how efficient they are.
    
    The Tympani IVA can accommodate only 7 of them in the original baffle, but they are the same width as the opening so really easy to mount.
    
    I like the original IVA midrange, but these are head and shoulders better, at least the original mids are.
  - RE: Tri-amping T IV-A's with tubes? - Roger Gustavsson 04:15:52 12/04/24 (3)
    Maybe these https://www.parts-express.com/GRS-PT6825-8-8-Planar-Mid-Tweeter-8-Ohm-272-126?quantity=1
    The GRS seems to have a bump at the fundamental resonance, the BG had no such bump.
    As you will need 14-16 of these, it will not be a cheap option for us in Europe.
    The original BG Neo 8 were better but became worse in its last years of production. The European distributor droped them because of large variations between samples.
    
    Edits: 12/04/24
    - RE: Tri-amping T IV-A's with tubes? - AkuAnkka 04:59:38 12/04/24 (2)
      Thanks Roger! 16 pcs of those would not be "cheap", but I'm afraid that if I have to send my mids from Europe to USA (and back) for refurbishing process, it might cost even bit more...?
      
      Small bumps wouldn't be a problem anyway due DEQX, if the sound quality over all would be better than stock. But does anyone here have any experience on those GRS's, how would line of those compare to the TIVa's original mids (or NEO8's)?
      - RE: Tri-amping T IV-A's with tubes? - Roger Gustavsson 06:42:44 12/04/24 (0)
        
        In Reply to: RE: Tri-amping T IV-A's with tubes? posted by AkuAnkka on December 04, 2024 at 04:59:38
        
        A line of the original BG Neo 8 have some users, Josh is one of them. Refurbishing Magnepan can be done in Europe (some guys in Germany). Sending them to Magnepan will be very expensive...
        
        Edits: 12/05/24
      - RE: Tri-amping T IV-A's with tubes? - goryu 05:14:00 12/04/24 (0)
        
        In Reply to: RE: Tri-amping T IV-A's with tubes? posted by AkuAnkka on December 04, 2024 at 04:59:38
        
        Check your messages please....
RE: Tri-amping T IV-A's with tubes? - AkuAnkka 03:16:30 12/03/24 (6)
Actually, now I found one nice tube amp DIY kit, which gives around 28 watts of output AND can be easily modified for 2 ohm outputs also, so low impedance shouldn't be a problem at all! :-)

Also, drivers' different sensitivities/volumes is not a problem either, since I can easily match them on the DEQX.

But Roger, when you say that "mids/tweeters do need a fair bit of power", what exactly do you mean, how much is "fair" for highs, how much for mids? Have you tried some lower power (tube) amps on them, what happened, how was the sound? I don't need "realistic" volumes anyway, I usually like to listen at quite mediocre volume levels.

And I understand well that it might be hard to say any exact wattages, "enough power" depends on so many variables. But if someone here has already tried any low power amps on 3-way setup, I'd really would appreciate to hear some real life experiences, both good and bad.
- RE: Tri-amping T IV-A's with tubes? - Roger Gustavsson 03:55:58 12/03/24 (5)
  I have used a Denon minireceiver for my 3.6 for a while. Output was like 2x45 W in 4 Ohm. Later, I went to something like 2x130 W and then
  4x260 W. The peak power for higher frequencies is almost as high as for the bass. Most Magnepans are not as efficient as the numbers on the Magnepan's spec. I have measured something like 82-83 dB/2.83 V.
  - RE: Tri-amping T IV-A's with tubes? - AkuAnkka 04:17:36 12/03/24 (4)
    Roger, are you sure about this: "The peak power for higher frequencies is almost as high as for the bass"??
    
    For example, at PS Audio's web page it is said that "It takes a ton of energy to reproduce bass notes, but not a great deal as the scale goes upwards. Fact is, most tweeters never see more than a few watts."
    
    https://www.psaudio.com/blogs/pauls-posts/tweeter-power?srsltid=AfmBOoolGcWuHJHrs-ksa08d11QtZEmouUrLOXbaKXvLxV0gsN5o31C1
    - RE: Tri-amping T IV-A's with tubes? - Roger Gustavsson 08:07:00 12/03/24 (3)
      Here are two examples:
      Michael Jackson - Don't stop til you get enough, the upper curve
      
      Michael Ruff - Wishing Well, orange below 100 Hz, blue above 100 Hz
      
      Edits: 12/03/24
      - RE: Tri-amping T IV-A's with tubes? - AkuAnkka 09:52:09 12/03/24 (2)
        
        In Reply to: RE: Tri-amping T IV-A's with tubes? posted by Roger Gustavsson on December 03, 2024 at 08:07:00
        
        Thanks again Roger, but I don't have a clue what these images should tell me regarding the tweeter's power needs? :-)
        
        RE: Roger's comment ... - andyr 13:25:30 12/05/24 (0)
        
        In Reply to: RE: Tri-amping T IV-A's with tubes? posted by AkuAnkka on December 03, 2024 at 09:52:09
        
        " My advice is still to have similar power on basses and mid/tweeter " ... I would agree.
        
        I used (ss amps):
        * 180w into 4 ohms on the bass panels
        * and 120w into 4 ohms on the mids & ribbons (3ohm ribbons).
        
        RE: Tri-amping T IV-A's with tubes? - Roger Gustavsson 10:06:17 12/03/24 (0)
        
        In Reply to: RE: Tri-amping T IV-A's with tubes? posted by AkuAnkka on December 03, 2024 at 09:52:09
        
        The one on top, shows the same level from bass to tweeter.
        
        The second one, shows a higher power demand for frequencies above 100 than below, 3 times more.
        
        These are peak level not average. Musik is peak level, not sinus.
        
        My advice is still to have similar power on basses and mid/tweeter.

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