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In the Forum: Playback Listening
In the Thread: Remedies the Beauty
Post Subject: It is complexPosted by Edgar= on: 10/27/2022
Yes a few ridiculous requests and statements there indeed. Full ridiculousness intended.
I know Dunnoy needs a lot of power and low impedance amp. My aims are not the same as yours here as I'm not concerned to have a SS amp. I am concerned with having things be generally smaller though. I will organise to listen to a VFET so I have a reference for it.
Regarding integrating bass, the problem I think is how rapidly the active radiator decouples from the passive one below the passive radiators Fs. Being such a sharp lower knee makes it hard.
If you were to high pass successfully I guess it would need to be 3rd or 4th order right below the system Fs. The free air Fs of the 8565 is 20hz but obviously higher in a small box. There is more to it however.
I think the challenge with high passing is sure, now there is no program material going to the speaker below Fs, but the passive radiator still has it phase shift. And probably worse now because the active radiator is not playing lower, it is not countering the phase shift. Maybe a solution might be driving the passive radiator lowpassed but out of phase, to help flatten that lower knee. What I mean is say 100w low impedance amp with 20hz-40hz, 4th order lowpass filter driving the passive radiator (which yes is technically now no longer passive) out of phase. Might be interesting to try. Might be able to flatten that knee completly out having no phase shift of the passive radiator at all. That would then improve things impedance wise for the Tannoy and amp combo as well.
@N-set, Yeah my thinking is if you are going to add more channels then have them coupled to the passive driver. either their own passive radiator or share the one with the tannoy. If it is a sub scenario then probably its own passive radiator would be better as a guess.
My comments re injection are just my comments, of course you will do what is right for you.
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