Here is an excerpt from "The Modern Edition: Robert's Rules of Order" by D. Patnode regarding quorum,
"A Quorum is the minimum number of members that must be present at a meeting for the transaciton of business. Unless there is a rule to the contrary, a quorum is a majority of the members. It is usual, however, to adopt a much smaller number, the quorum often being less than 1/12 of the members. An organization's quorum for meetings must be set in the bylaws, preferably as a fractionor a percentage, rather than an absolute number.
While a quorum is competent to transact business, it is usually not prudent to transact important business unless there is a good attendance at the meeting." (Page 90)
And from "Robert's Rules in Plain English" by D. Zimmerman,
"The purpose of quorum is to prevent an unrepresentative group from taking action in the name of the organization." (page 8)
It seems a bit dangerous, and contrary to the concept of quorum to define it in such a way that 1 or 2 members could transact business. According to the interpretation of RRO in my little books cited above, you can't suspend quorum. If quorum is not present, the chair should figure out how to get quorum (we once had to run thru the school asking teachers who had stayed late to come into our meeting for a vote) or adjourn the meeting.
I need to retract something I said in my earlier post on quorum. According to Patnode, "There is no requirement, however, that a quorum vote on any given motion; it is entirely possible that members will abstain, and the rule of quorum is merely that the members be present, not that they vote." [page 91] So...as long as you have quorum in the house, you can vote, even if some of those members chose not to vote (i.e. abstain).
When I became PTO president a few years ago, I bought two summary books about RRO, the ones I cited above. These guides have been indespensible in understanding the nuances of RRO. I bought two different ones so I could see two interpretations by differnet editors. Major Robert's orignial rules are over 800 pages, so having a summary is essential. And since we're not running the Congress nor studying to be certified parliamentarians, I think a summary book serves the PTO just fine. I found my books at Borders for about $5 each. A very worthwhile investment.