Proac One SC versus De Capo i. Opinions please?

Hello Wrightstuff. Two very good speaker choices... you have good ears sir! Your Sugden amp should drive the proac's easily. The response series of the proac line present a rather benign 8 ohm load for the amplifier and respond well to even low powered set tube amps. I had a pair of the reponse 2 speakers and drove them with an 18 watt set tube amp. That match up, made for nothing but beautiful music. I sold them to a good friend that is using them with a 22 watts [845 based] set amp and it has to be considered top shelf by anyone's standards. I also used the decappo for about a month after selling the proacs. It is a terrific speaker to be sure,personally... I preferred the voice of the proac response 2. That said: I have never heard the resonse 1's in my own rig,however... like all the response proacs, they are relatively easy to drive and posses a beautiful voice. To be candid here.... Either choice of speaker would be a great one for you. The proac 2 had the more extended bass reponse between the two in my room however, I would hazard to guess that the decappo shoud have the better extension between the response 1 and the 3a. The bass reponse of the decappo is truly amazing in it's ability to resolve imformation, it's fast, coherent and tuneful. String and percussive bass sound rythmic and coherent with the midband and never leave you thinking that something is missing. The tweeter of the the proac is a little sweeter and more spacious than that of the 3a's and I personally prefer the proac house sound because of it. I should also qualify that I based my observations on both speakers here with tubed amplification and vinyl as my preferred source. Your room,your ears and with your rig...your mileage may vary. My 2 cents worth. Cheers and best of luck!