+1 Volti. I have the 100db Volti Rival to investigate tube sonic magic starting with flea watt SET amps down to 2wpc. I choose Volti for its clear neutral presentation so I can better hear the amps, especially when I tube roll. My first amp is also a 300b SET.
I would go with a pair of the Omega High Output Speakers with their RS5 driver. It's a fast driver with a wide image that's easy to place. I think it pairs well with the 300B which can sometimes be a bit on the slow/syrupy side. I'd add one of their subs too.
These types of posts probably aren't well received, but I 'm using my Cube Bliss C speakers with an Elekit TU8900 with a pair of Western Electric 300b tubes and they sound great together. I currently have a much more expensive pair of wideband speakers on order, so if anyone has any interest please PM me.
I love my 300B system. It is a headphone system. The head amp produces very large current (for headphones) and sounds spectacular. My main system uses tubes (but not 300B)... but easily drive my speakers. In this way, I get to enjoy 300B without the significant compromises you must endure if you power your main speakers with them.
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