As a pratical matter concrete is not resonant. So long as your speakers are connected directly to the concrete via any type of well constructed and effective spikes, i.e. those that effectively piece carpet and pad and support you speakers firmly, you've done as much as you can do. IMHO, in your situation the fine gradiations in support spike's construction, beyond good support, is sales hype. At least that has been my experience from experimentation and I know of no solid engineering support for products beyond those that can support your speakers and make a good solid connection.
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