Driving a Thiel

To confirm what Tubeo just said, I drive my Thiel 2.4s with Audio Research's Ref 110 power amp (110 wpc) but it has high quality transformers and overengineered power supply (with 520 Joules of energy storage), providing plenty of headroom for peak energy demand. They sound great together but the amp is roughly 2X the cost of the speakers! If you cannot hear the combo together, I would err on the side of caution and look for speakers that are more sensitive with benign impedance curves.

Not to go on a tangent but I would actually work your problem in reverse (funds allowing ofcourse), which is to say, I would start with a speaker that you like and work your way back to find the proper amplification that will drive the speakers suitably. But that may be more than you want to chew on right now. Good luck.

Dave43 is right, so I will go ahead and be the fourth to tell you that your receiver is a poor match for these fine loudspeakers.

Not to say you shouldn't follow Cmalak's advice and get the Thiels of your choice and then move to better amplification as your budget allows. Just make sure that your Marantz receiver is capable of driving <4ohm loads, otherwise you will soon be listening to the wonderful sound of silence.

Better yet, why don't you pick up a pair of used Thiel 2 2's for about $800 (IMO these sound better than any of the models you mention) and use the extra funds to buy an amp that will do the job well.

Good luck.

You can get a bel Canto s500 or S1000 for amp needs for the Thiels. They sound very good together.

I am a Thiel dealer and I have found Thiel loudspeakers to work best with class AB, or class A amplifiers.
I like them best with Plinius myself.
Anything high power and high current should work well!

No, your reciever will run out of power. You will need an amp with some ba..s for any Thiel speaker. Just because an amp has hi wattage does not meean it can handle Thiels. Whatever you try make sure you can drive them at the volumes you really want to listen at. Do not baby them, other wise when you want volume you may not get it. Thiel speakers will give most any amp a through workout. Some high power amps in the 500 to 1000 watt range must be modded by the manufacturer to deal with Thiels.
Thiel makes great speakers they just have a wide ohm range and need lots of power to sound their best.
I have Moon W6's, they cannot drive Thiels with any justice.
Enjoy