floorstanding

Bought it December last year, been listening to 8.4s since the purchased date and it sounds more better each day. I tried max volume of up to -20dB on a Yamaha RX-V640 and I'm please with what sound and detail it produced. Even with different genre Jazz, Classical, Rock, Pop, R&B, etc. The bottomline is that this speakers are professional performers.

Though it takes sometime to break-in, listening to it out-of-the-box will annoy your ear, it's muddy at first power-up then became nicer and nicer. The grills are flimsy but for the price this speaker are really best buy.

I got these babies about 2 weeks ago from Amazon.
They are not as compact as I thought.
I think that this is an excellent speaker for the price I paid (400$ / Pair), but I don't think spending the original price (600$) is reasonable, and not because of sound quality.
Actually I haven't decided if I'm going to keep mine or not.
I live in Oklahoma and it's very difficult to buy speakers over here, because you don't have selection of speakers that you can audit.
I love British speakers and they are very expansive in the States.
Let's get to business: sound quality is superb. Very effective and punchy low end without neglecting the high end which performs great clarity and a very open sound.
Bi-Amping is significantly, unbelievably effective. I did it with a pretty powerful NAD receiver and the compatible power amp. Amazing sound and capability.
The negative side (critical to me but does not effect the rate, just because of the price I paid): UK speakers which are made in China, I don't think that this is suitable for speakers (and I didn't notice any comment regarding that on Amazon), terrible grills - I don't know how long they will last, also I don't like the finish (vinyl that I'm not sure how durable it will be and how they will look like in few years).
Bottom Line: great sound but still hesitating due to the built quality, I'm eager to get something like Monitor Audio Silver 6/8 or the astonishing Wharfedale Pacific Evo 30 but they are more than twice the price I paid and I'm not sure that the sound is any better.
If you can compromise about the built and you get them, try Bi-Amping with quality compatible Amps and you get a high end sound.

It's somewhat hard to describe the sound quality of a speaker in words -- it's kind of like when people wax poetic about a fine wine.
So, I'll cut to the bottom line: I have been very pleased with my Diamond 8.4s. At this price point, nothing comes close to the combination of outstanding sound quality, build quality, and good looks. If I had to do it over again, there is no question I'd go with Wharfedale.