: : : If they are 4 ohms then parallel wiring will cause a 2 ohm load at the amp...most amps are not stable at 2 ohms when bridged. So definitely run as stereo pair (Bass is non-directional below 80hz, but it's still stereo!!!).

: : : If they are 8 ohm each...there is nothing wrong with running 8ohm loads if your going for sound quality...the higher dampening (sp?) factor is actually better and the loss of power (3db) is hardly audible, the amp won't run as hot and everything will last longer.