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RonyWeissman wrote:

 I have the 515-Gs If I remember correctly, and I am trying to find suggestions on what is proper horn-loaded cabinet still.  And I agree my tannoy golds so far have worked best with early 70's mcintosh 2205 (200w/channel). Otherwise I am afraid that I don't understand your advice above.  Let's say I find proper horn-loaded cabinet for 515s, are you saying that I probably won't need to go for seperate sub-woofer set-up, and then i'm afraid I can't figure out in which case you think it's worth going for the more expensive transformer and in which case it's not really going to be worth it...My tannoy's are in fairly large room (500sq ft plus), the horn set-up in room maybe half-that with very high sloped ceilings and two-feet thick stone walls.

http://www.ae-europe.nl/audio_engels.htm

What I meant suggesting that you might not need a larger output transformer? I mean that you might not need to spend money and peruse for as high bandwidth Milq as possible… Forget about "Golds" and Milq and let look at your horns...

If the lowest channel that your prospective new SET will care will be a channel around 515G drivers then use 8Henry Lundahls and it will be absolutely enough. My 200mA does 21.5H at 12W (all my measurements everywhere are into 12Ohm). You can make it 300mA and get 30H that still is perfectly fine for a channel around 515G.  The 515G is a very good drive. It has 37Hz air resonance and it usually used on horn or 45-60Hz. It is important do not drive those 50Hz horns with very low signal - it kills sound of upper bass and it is what the Morons out there do typically.  The LF of the half octave under the horn’ rate MUST be unloaded from the horn, otherwise the excessive LF will pressurize horn’ bell but will not be exiting the horn leading to “tight” and “congestive” upper bass.  Usually for 50Hz horn (with no back chamber) a high pass 25Hz filter is a must. So, what is the point to invest effort into a transformer that would do more LF if you will need to intentionally limit the LF?

Well, it might be an argument that a transformer near its boundary begin to distort and to cut signal with filter is preferable. However, you will be using a first order filter and it is very nice when a filter just begins to cut and then a transformer kicks in. It will make a sort of shaper LF dying…

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