all2Ears, I certainly believe that a subwoofer can improve your sound. However, I believe a Mac 1502 the minimum tube amp for the SabrinaX. I do not believe a Mac 275 adequate to get the best out of the speaker. It's sensitivity is rated at 87 dB. If played loudly I think the SabrinaX would easily clip a Mac 275. I think you need a clean 150 watts of tube or 300 watts of SS to adequately drive this speaker. Before I bought a sub I would adequately power the speaker. But I know you don't need me to tell you this. Good luck on your purchase.
Best
Charles
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