ski bum
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I think I know what you're hearing. Bear with me here, long post...Torii II to SE34 is a big clue.
Listen carefully in the bass. You mentioned the slightly prominent midrange relative to the bass. Do kick drums seem to have extra impact, punch, or presence, with otherwise laid back bass response?
Does this describe what you're hearing?
If so, you could be experiencing the effects of higher output impedance than you're used to. With the lower damping factor of the SE34i I would expect the bass response to be slightly reduced (maybe a couple db) compared to the midrange, and a couple small but notable peaks (that crest at levels near that of the midrange) that correspond to the cone's resonant freq and the port's resonant freq. This is the fairly typical way high output impedance amps behave with ported/reflex enclosures. This stands even if the power delivery from the SE34i to the Omegas is ideal.
The port resonance point should not be too much concern, as the speaker is likely rolling off by that point, so it will tend to extend the reponse you get. The woofer resonance is probably an octave or so higher, and non-linearity will be more noticable (for example, extra presence on kick drums for would be a peak somewhere from 70-100hz).
On my speakers, which I can reasonably presume present a much wilder load as far as impedance/phase goes, the deviation from linearity is still only about +/-2.5db (as measured at the speaker terminals with amp connected). I actually have a jpg of that, if I could figure out how to attach it here, it would go further than my convoluted explanation.
I would expect a more SET-friendly purist speaker like your omegas would have much less deviation than what I use, but the non-linearity is the nature of the beast with the higher output impedance. To cure it would require applying negative feedback, and possibly more gain stages or other complexity in the amp, which would rob it of it's uber clarity/transparency.
You also noted something I have also observed, that the SET detail and tone is all there in the lower registers, even if the response is slightly attenuated and a little lumpy/peaky. That's the rub. The detail and tone is addictive, and you don't want to do without it.
One thing you may consider doing which would preserve all the SET goodness and directly help cure your bass is simply adding a decent sub. Feed it speaker level inputs so it get's the Decware sonic signature. You'll extend your response much deeper, and smooth out and firm up the midbass at the same time.
Check out Rhythmic for high value, high performance, well damped ('fast' sounding) subs that can keep up with your Omegas. I think their 15" sealed job is going for only $500 right now.
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