suggest tube amp wattage for my speakers..?

• IMHO, impedance curve is probably most overlooked stat. for speaker use with tube amp. Check what frequency minimum impedance is at. Tube amps not good for impedances which have wild swings.
• 87dB sensitivity isn't very great. Recommend sticking with a larger push-pull amp.
• Don't make mistake of running minimum wattage. Allow yourself headroom. You might be able to get by with minimum if you listen mainly to jazz. However, if you like to rock out occaisionally or listen to classical…
• Often overlooked is crossover slope. Recommend a 1st or 2nd order xover for use with tube amp.
• Check reviews online to see what amps reviewers are using with speakers.
• E-mail manufacturer for recommendations.

You should't have any problem with sensitivity. I was under impression you wanted to use as home speskers & sit approximately 6-9 foot away from RBH's. Sitting in nearfield overcomes a myriad of volume level problems. You should be able to easily tell when your amplifier is reaching power (wpc) limits and starts clipping when it starts to distort & bass no longer gets louder as you turn up volume (level) control. When you start hearing audible distress, back off the level control. Most people don't realize how loud 87dB is when your speakers are less than a meter away. See example impedance curves at http://www.stereophile.com archived speaker reviews.

Gunbei says he has no problem driving 86dB ProAc speakers despite 86dB sensitivity due to "mild impedance curve." My previous speakers were Spica TC-60s. Thier sensitivity is only 87dB with relatively flat in impedance curve. I had no problem driving with 8wpc tube amp. However, I rarely exceed 85dB, maximum. Just realize you don't have inexhaustible power & drive RBH's accordingly.

E-mail manufacturer for recommendations. They should know thier products better than anyone. Take advantage of thier expertise. Also, check out online reviews to see what amplifiers reviewers use & why.

About the only thing I would be concerned with since reading subsequent posts is crossover slope. 3rd & 4th order crossovers have tendancy to dissapate the first 4 or 5 watts as heat, not a good thing with low-powered tube amps where wpc are precious. Be sure to read Welborne Labs comments on "Some Insight into Proper Speaker Selection" at http://www.welbornelabs.com/recomendspeaks.htm (you have to scoll about 2/3 down page). It really is a good primer for plain talk about MINIMUM speaker sensitivity recommendations.

An inexpensive speaker tweak is to get an isolation cone or small piece of scrap wood to tilt your speakerss back so tweeter is aimed at ear level. Most speakers designed to be listened to on tweeter axis.

BTW, I can't speak with authority on Dared amplifiers since I've never heard but did notice several in AuduoGon auctions today. Sound like they could be what you're looking for.

Good luck.

Yes, you shouldn't have problem regarding overhead with 20 wpc amplifier.

But do check with RBH about impedance curve & crossover slope. Believe me, you'll fell much better to have another opinion. One who's opinion I would trust over mine.

Be sure to say you will be using speakers for computer/desktop set-up & you will keep volume level under control.

Good luck!