Let me try and put the two speakers in a little better perspective, since I designed both of them. First, the two speakers do use a ScanSpeak 5.5" woofer, but the Silk features the more expensive Illuminator, while the Philharmonitor uses the Revelator driver (still expensive, but not as expensive). The Illuminator goes a little lower than the Revelator, at the expense of around 2 dB less sensitivity8. Second, both tweeters are RAAL's, but the one in the Silk is the OEM 70-20, which is way more heavy duty and expensive than the 64-10 OEM in the Phil. While I think both are equally good in the upper treble, the 70-20 can be crossed much lower, which is an advantage in a 2-way. I wouldn't say the Silk is more linear than the Phil, but as mentioned, it does go lower. Then there's the matter of the cabinets. The Phil's that sell for $1,150 use prefabs with only two choices for finish.