Tekton or Klipsch

My advice would be to go with the company that has been around for decades and has an established dealer network. More importantly, if you ever decide to sell them you will find a market for them. Certainly, there are speakers that are cheaper, but cheaper isn't always better. You find that out when you try to sell them. As hard as it is to imagine now, you should always think about resale value.

Definitely agree you should consider resale... which is why some big 100# speaker will be an issue down the road as the buyer will expect you to factor the freight into your price. 


Also agree that you should try to hear your prospects...if at all possible. 

Hmm this info on the gain is interesting. Even now with the Kef’s i rarely go past 9 o’clock position. Sometimes maybe 10
when I’m listening to vinyl.

Magico,
As Al noted, your Rega Brio amp provides 40 db of gain which is very high re)active to many other amplifers. I’d bet that your Tube Cube amplifier gain output is likely in the range of roughly 25 db. This would be a much more suitable/flexible match for the higher sensitivity speakers you are interested in. Excessive gain offers no meaningful benefit.
Charles

Even now with the Kef’s i rarely go past 9 o’clock position. Sometimes maybe 10 when I’m listening to vinyl.

That’s definitely a problem, if you want to continue to use the Brio-r with one of the high sensitivity speakers that have been discussed. Stereophile measured the sensitivity of the LS50 as being 84.5 db at 1 meter for an input of 2.83 volts (the spec being 85 db). Roughly speaking the choices that have been discussed are about 14 db more sensitive than that.

Although this photo shows the front panel of a passive preamp I believe the dial markings for the volume control are reasonably representative of the characteristics of rotary volume controls that are typically used in active preamps and integrated amps, in terms of db of attenuation vs. position. As you can see the 9 o’clock position corresponds to about 37 db, so with speakers that are 14 db more sensitive the listening volume you presently hear at the 9 o’clock position would be produced at a setting of about 51 db, not far from the bottom of the range. And as you can see, near the bottom of the range adjustment resolution becomes much coarser than at higher settings (6 db per marking increment vs. 2 db at higher settings); channel imbalances may occur, depending on the particular control; and as Auxinput pointed out earlier the amp may simply not sound as good.

Assuming your sources don’t provide a volume or output level control the one solution that occurs to me if you were to use the Brio-r with one of these high sensitivity speakers would be to insert a pair of Rothwell attenuators into each of the pairs of input jacks of the Brio that you are using. Probably the 20 db version of the attenuator for the digital source(s), and the 15 db version for vinyl.

BTW, generally speaking I would recommend against in-line attenuators made by manufacturers other than Rothwell, as some of them have input impedances that are too low to be suitable for use with many source components. That will rarely if ever be a problem with the Rothwells.

Good luck. Regards,
-- Al