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de charlus wrote:

Romy, do you have first hand listening experience of these YL drivers? If so, in what sort of installation?

Nope, I did hear neither YL drivers nor ALE driver, as least consciousnessly.

de charlus wrote:

Doubtless you will refer me to an extant thread, but how is it that you dealt with the S2's secondary resonance?

Yes, there was information about it in S2 thread. Basically I begin to role the S2 driver from 3.8kH and at 1000Hz it arrives flat, including the secondary resonance. It has been explained in details. In your case, since you are planning to use the Vitavox S2 at 500-2000hz it will not be too useful.  You will need to use custom resonators that will, in my estimation, ruin sound even those they will flatten the frequency response. If you insist to do what you are planning to do then I would advise to find old Vitavox diaphragms with metal suspension. The drivers with those diaphragms do not have such a hard secondary resonance and they might be more or less be used flat. The problem with those diaphragms that they are very harsh upper region …but you will not use them in there as you will be having ALE driver taken over at 2000Hz.

de charlus wrote:

It would seem that Jeffrey errs on the side of building DSETs from the ground up; I do see the many virtues that this route offers, but I had previously thought it a good deal simpler, and possibly cheaper, to buy commercial SETs and modify them as necessary. Have you ever costed out a Melquiades, Romy, in terms solely of materials and the labor involved in construction of a unit? Call me a heretic, but I like the GM-70 tube best of all those that I have thus far encountered in the SET topology - and I am the first to admit that these encounters have been far from exhaustive; that which forms the basis of the Melquiades, for instance, remains obscure to me - and cannot imagine that a custom SET employing that tube would differ radically in price from one using the 6C33C. Given that I shall be needing 10 of these, price must be considered.

I seriously do not feel that you near anywhere to start to think about amplification for your projects. I love to run my mouth on audio subject but to discuss the amplification need for the project you are planning at the state you are is truly pointless. Have one SET amp of 8-12W that you like and run from it the whole system with passive filtration. As the additional benefits you will be able to play with channels loading in this configuration. Going DSET in smart was is way more complicated and I very strongly advise you for now to stay away from it. Jeffrey does make a mistake feeling that he can at this point to force what amplification you would need. BTW, GM-70 is very fine tube but this tube is to drive 92dB sensitive direct radiator. What will you do with your 110 sensitive acoustic system and 30W? As you have an  acoustic system that will be able to react very “nuancely” to very delicate minimal currents you might find that very low power vintage triodes are more interesting then the “elephant touch” of high voltage GM-70. Melquiades is not expensive, neither in parts or build but I do not think that you need o be attracted to it. If I had your (proposed) set of the channels (with obvious exception of Lower Bass channel) then I would be looking for some kind of DH DSET with probably GM-70 on the AK151 driver (wich I am sure you will be driving lowers then 100Hz).

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