The JL Audio XD400/4 4 channel amplifier can deliver 75 watts RMS per channel to 2 pairs of speakers, or it can drive a full set of separate tweeters and woofers with its four channels. You can even bridge the XD400/4 into 2 channel mode to power a couple of subs with 200 watts each. It provides up to 104 dB signal to noise ratio. The device dimensions are 2.06 inches height, 8.52 inches width, and 7.06 inches depth.