I have had both in my system and chose the Proac's. I use Naim gear and tried the s8e's and the D28's. I loved the top end of the Spendors. My room acentuates HF to make your ears bleed, (at least my ears) and the Spendors were really smooth and non fatiguing on top. But the bass was where I had problems. Deep but slow, a tad wooly. I tried altering the port and moving them around but the bass was always too much and it made everything sound like it was a beat behind. I knew it wasn't the amp.
Then I tried the D28's and while they don't roll off the HF as much the bass is really tuneful and tight. They are smooth as well but a tad less polite, more truthful. I bought them and never looked back. This is after using Sequerra's for 12 yrs. or more.
I'd worry that the s9e's would be a handful for your amp. That big woofer needs a lot of control. But if you need to smooth out your sound they are probably a better choice. But don't say you weren't warned about the bass.
Then I tried the D28's and while they don't roll off the HF as much the bass is really tuneful and tight. They are smooth as well but a tad less polite, more truthful. I bought them and never looked back. This is after using Sequerra's for 12 yrs. or more.
I'd worry that the s9e's would be a handful for your amp. That big woofer needs a lot of control. But if you need to smooth out your sound they are probably a better choice. But don't say you weren't warned about the bass.