I use REL stadiums with SP-1s and 2/2s. Very good sound. Gives option of rolling off Spendors for greater volume or using them to supplement bottom end. I use the latter method. You will find bass on records that you didn't know was there. I have some direct cut LPs and occasionally they will make you jump. Within their loudness capabilities they will give outstanding sound; probably not loud enough for the HT crowd but loud enough for me. I would go with 2 Strata or Storm subs. Stay away from the T series as they have sacrificed bass extension for volume.
Match subwoofer to Spendor S3/5?
Bought some Spendor S3/5 unheard but aware of limitations on bottom end and dynamics. Speaker is great for mid-range on acoustic jazz, female vocals,similar but curious if anyone has matched sub to it and what the impact is? Does it now work for rock, electric jazz, more dynamic stuff?