This presents a subjective study that investigated the effects of different depth and width dimensions of a 4-channel ambience microphone array on perceived environmental depth (ED), environmental width (EW) and listener envelopment (LEV). Test stimuli were reverberant recordings made using four backward-facing cardioid microphones with varying depth x width dimensions of 0.5m, 1m and 2m for each, creating nine test conditions. Results of listening tests conducted using four loudspeakers ±30° and ±120° showed that the array depth had no significant effect on either ED, EW or LEV. The array width effect was significant on EW and LEV (1m = 2m > 0.5m), but not on ED. From this, a new 0.5m(D)x1m(W) ambience array with four backward-facing cardioids is proposed.