there is no advantage to hooking up 2 speakers to the same channel to get more power.
75 wrms each or 150 if you put both on the same channel. Doh!, they still get 75 w each. Except now one channel of your amp gets hot and you get more distortion at 2 ohm than you did at 4. And you're not stereo, or you've lost the fader.

Buy the right equipment in the first place and you won't be trying to figure out stupid ways to get more power.

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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