I have owned this hifi for a couple of years, I originally bought it with the Onkyo speakers, which were average at best, very clear treble, but lacking in bass. I quickly replaced the Onkyo speakers with a pair of Yamaha NS225-F floor standers (slim & attractive) which transformed the sound tremendously, the only thing lacking with the Yamaha NS225-f's was the weak/inaccurate treble, so I took the decision to replace the tweeters in the Yamahas with the ones from the Onkyo speakers, the result was a revelation. Whilst the Yamahas were great at suppling clear, deep, (but not room shaking) bass, they now also supply very clear, crisp treble tones, that together compliment the Onkyo CR515 perfectly. In the past I have owned very high end hifi (with expensive upgrades), with which the Onkyo CR515 obviously cannot/is not designed to compete, however, for the price, and convenience of a one-box-system, coupled with the modified Yamahs NS225-F speakers, this is the perfect system for a medium sized room, where the listener is expecting high quality sound at a reasonable cost.