A question of bass... Several actually.

Rhanechak - what amp did you have driving the Dynaudios? My experience is that the A 72's can go very low and loud when driven with sufficient power (300W or more into 4 ohms). The Regas on the other hand are more efficient and can run on less juice - like that produced by a Rega amp...

Bass reproduction is a two-way equation, power to control vigorous driver movement and a combination of driver diameter and throw to move a lot of air. The smaller the driver, the faster and further it has to move to displace the same amount of air as the larger diameter driver. I have heard phenomenal bass from stand mount monitors when driven with lots of clean power. They weren't hitting impossibly low notes, but the notes they were hitting were controlled, clear and loud.

So, I might say that while it is not "necessary to spend $1000 per speaker or over to have audible, palpable, appropriate bass reproduction" it may be necessary to spend $1000 per channel of amplification to get it.

Subwoofers are an entirely different story, and the trick there is that most better ones come with their own capable bass amplifier designed to control the woofer. The idea provided above to split the signal after the preamp and drive a high quality monitor with a high quality but lower wattage tube or SS amp, letting the sub fend for itself is a good one. Sub speaker integration is usually possible, but takes some fiddling, and may actually require trying several subs with your system to find the best match.

With either the Rega or the Dynaudios, you should not need a sub unless you need the walls of your house and your heart to move with the music. As long as you feed either pair with adequate power (which would be more in the case of the 72's), they should reward you with nearly full range sound.

Good luck.

I was using a Prima Luna Prologue 1, the amp I was thinking of buying. Why not audition all the components I wanted to put together?
After having read the reviews of the Dynaudio 72's (many many many positive), and the Rega R3's (very few, although positive), I was really unimpressed by the Dynaudios.
Their presentation was flat and unimpressive.
The Regas presented a great image, and seemed more 'live.'
The bass in both speakers seemed adequate.

03-26-09: Rhanechak
I was using a Prima Luna Prologue 1

That's the answer
to the unsatisfactory bass from the Dynaudio speakers.

The Prologue 1 is not enough amp to drive the Dynaudio speakers. The R3 are a
better match.

I'm doubtful any tube amp would produce deep, controlled, balanced bass the
Dynaudio 72.

Would 100 wpc solid state do the trick for the Dynaudios?

03-26-09: Rhanechak
Would 100 wpc solid state do the trick for the Dynaudios?

That would depend on the size of your room and the volume at which you listen.

The Dynaudio 72 are not particularly sensitive at 86dB.

A 100wpc amp will run out of juice at about 105dB music peaks.

IMO, a 200wpc solid state amp would offer more flexibility.