Initially, I had bought the Dali Spector 1, but since the store didn't honor the discount, I returned them. Then, I bought the Polk S15e, but before receiving them, I decided to return them and get the Wharfedale Diamond 320, based on some reviews and comparison videos. As soon as I received them, I decided to test them before returning them, and as soon as I heard them, I decided to keep them.
They are powered by a Class-D amplifier with a Fiio E17 optical S/PDIF 192KHz 24bit DAC, and I use them as computer speakers, mainly for listening to uncompressed music and occasionally watching a movie. The frequency response is not flat, but it emphasizes the lows and highs. The bass is very clean. What impressed me was the soundstage. Although I have AudioTechnica ATH-M50 (monitor) headphones and Sennheiser PXC 550, the spatial localization of the sound created by the speakers is highly accurate and seemed better than the headphones. Additionally, even though they have a rear bass port, the "Powerport," which is essentially a plastic cap with a hole, directs the bass sideways to prevent static waves and distortions caused by wall reflections. This allows them to be placed close to a wall, making them ideal for computer speakers, while also having a mounting screw support on the back for wall mounting. Overall, I am very satisfied because I found them on sale for just a little over half their original price, and their sound is exceptional.
Compared to the Dali, the S15e are much more refined in design and construction quality, and in terms of sound, although the Spector 1 have a nice sound, the soundstage is much inferior to the S15e.