i have an rfp-1210 and an rfp-1212, both matching year, wattage and impedance... the question is can i run them both on a rockford punch 800a2 safely?

also is it harmful to only use 1 channel unbridged?

One on each channel is fine

Running only one ch is fine

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Alpine CDA-9887, TUA-T500HD, CHA-S634, CHA-1204 & KCA-410C
Pioneer TS-A6981, 6 x GM-5100T
Kicker 2 x CVR15,
MBQ RCE-216
PG MX2
Soundgate LanStar1
PAC SWI-ALP

I wouldn't recommend running two different sizes at the same time,@same X/O point.
It'll sound wrong, as each has different frequency response, etc..
it will work, but..

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E.C wuz here