What speaker could safely be ordered without hearing it first?

Speakers are the most subjective link in the music chain of all, even tge moreso by being placed in a different room than whatever "typical" room they were designed for, and whatever electronics they may have been voiced for. To that end, after many years of making and building customs for others, I finally built my endgame speakers. 

People seem to like them, but I have no doubt they don't conform to anyone's idea of what great measured performance is, and that's on purpose. I listen subjectively.  So any speaker may be safe for you to buy unheard, but it's also a safe bet IMO it won't be exactly what you wanted in your own system in your own room.

If you find Castle speakers on the used market for a few hundred bucks, then get that. That may as well be my final answer. You'll get real veneer and decent drivers/parts.

Some sellers are so desperate that they even give away the optional wooden stands for free. Unlike with JBL or Klipsch, you won't get any recognition from the audiophile community.

But you won't overpay for something that's "just fine". Castle is like the most uninspiring brand with the least curb appeal.

Castle is just like Harbeth without the name recognition and the same bland design. That's great for your wallet. It's kind of like a buying an Infinity on the used car market. The depreciation is insane because nobody cares. I see beat-up Honda Civics sell for more. 

I would suggest some of the youtube reviews by some of reviews with high traffic. Old timer story......In 1970 or so the only place you could buy stereo equipment at a discount was out of NY with ads in the back of Stereo Review. Being from a small town in Minnesota, mail order was your only option. I bought a pair of Altec Lancing Santana speakers, monsters with 15" woofers, walnut cabinets and slate tops, large end tables really. You had to tear out an order form, fill in your stuff, add up the cost, write a check and send it off to NY and then wait. I had them shipped by freight (only option) and my mother took me down to the local train depot and we picked them up in dad's truck. I think I paid under $400 for the pair with shipping. Ahhh, nostalgia!

@8th-note

Bottom line, there is no way I’m going to restrict my audio purchases to gear that I can audition at home. I just bought a Jay’s Audio CDT3 Mk III transport that was shipped from China. There is simply nothing else on the market like this transport and I was willing to believe the reviews and take a chance. I totally love this thing. If I restricted myself only to gear that I could audition I would have missed out on this incredible component and many of the best components in my system.

"The best transport" is an ongoing thread-theme, here, and there are a handful of other highly-regarded transports that are mentioned repeatedly.

In fact, I bought one of them, the Pro-Ject CD Box RS2 from TMR and ended up returning it due to the ergonomics. At that point, the best alternative unit fitting my budget was not available for purchase with a return policy and in a rare exception, I opted to break my own self-imposed rule.

This nearly turned into a disaster as the unit was quite forward sounding in my system. Fortunately, I was eventually able to tame the sibilance and fatiguing highs via cable and footer swaps. BTW, my speakers, DAC and integrated are all on the the warm side of neutral and none of the various reviews I’d read mentioned the forward quality of the unit in question. I only came across references to this "after the fact", courtesy of a forum member who happens to be a dealer.

You must naturally follow whichever path works best for you but in my case, the experience I’ve described underscored two things; 1) buying gear I can demo at home and return if necessary is the best way to go and 2) reviews cannot be wholly relied upon.