teepeeworks
Ex Member
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The speakers are really quite different and serve different purposes. First thing you have to decide is which amp you are most likely to drive them with. I know nothing about the Darling amp but I am going to assume that it does not fair well into 4 ohm loads. I really don't know much about the Dynaco either, but if you are using the ST-30 amp, power really isn't an issue.
Lets assume either amp can properly drive the MKII, then it really boils down to efficiency vs. smoothness. The HDT is a very efficient speaker. I run an EL34 amp in triode that puts out about 4 watts max and can get it very loud. I believe part of this perceived loudness is the midrange presence from the speaker as well.
The MKII on the other hand is going to be a smoother speaker and more forgiving. It also will give you more bottom end weight and better imaging.
I am going to assume you want to use your 1.5 watt SET so I am going to recommend the HDT using the single Fostex driver. The impedance match is better suited for your amp and you are really going to appreciate that extra efficiency. 1.5 watts is not alot of power and 2 db more efficiency can mean the difference between you being able to hit an unrestricted listening level or longing for a bit more...
Probably my favorite characteristic of a good hi-fi SET is the midrange bloom available. I suspect the Fostex HDT also potrays this bloom more realistically, or put another way, doesn't smooth it over.
You did not mention whether the ribbon tweeters you have are from Decware or not. I am assuming they are not. With all do respect but I believe Steve modifies these tweeters and I chance to say your's may be inferior to what is recommended. If you are going to go through the trouble of building an HDT cabinet then you might as well use the exact drivers he uses in the tweaked design.
Considering the Fostex driver, all you have to do there is cut away the dust cap and install a 15/16 inch socket to the pole piece, done.
For my own personal tastes, and now that I have an amp with tube rectifiers and a really smooth top end from choice resistors and caps, I would not be without the midrange presence and bloom offered by the HDT with the Fostex. The HDT will make things sound scary real, especially voice, it is right in your room with you and that is always great.
Take care,
Corey
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