On my TAD R1 MK2s, I use Ultra5s with no spikes. Threaded inserts into bottom of the R1s with beveled edge of the Ultra5s down. Stillpoints logo then is next to bottom of speakers. With the R1s, spikes on Ultra5s were tried but the config was not good and speakers could not be moved without risking breaking off the bolts on bottom of speakers due to 330 lb weight of each and the smallish 1/4-20 threaded insert on back of the Ultra5a, so "No Spikes!". The sound improvement with Ultra5s was well worth the price...
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