Congratulations on the Proac's. I got a chance to listen to the D-48R's
briefly and was very impressed. If I had the room for them they would be on my list. I ended up with the D-30R's and have been extremely pleased with them. Like you, I wasn't too impressed with the stock spikes (or jumpers for that matter). I put some Audio Points 1.5AP-1 under my D-30R's and the improvement wasn't subtle. The bass was cleaner and more defined. The mid-range opened up as well and blended more seamlessly with the bass. I'd highly recommend them.
I should also note that if you don't like them you can return them for a full refund.
briefly and was very impressed. If I had the room for them they would be on my list. I ended up with the D-30R's and have been extremely pleased with them. Like you, I wasn't too impressed with the stock spikes (or jumpers for that matter). I put some Audio Points 1.5AP-1 under my D-30R's and the improvement wasn't subtle. The bass was cleaner and more defined. The mid-range opened up as well and blended more seamlessly with the bass. I'd highly recommend them.
I should also note that if you don't like them you can return them for a full refund.