1995 Honda Civic Rear Wheel Noise

I have a 1995 Honda Civic - 4Dr. Sedan EX with 189k miles. I have been experincing a lot of noise coming from the rear end of the car. I thought it was my tires, but I replaced them today, and I still have the noise. The faster I drive the louder the noise gets. It sounds like a low pitched whine at low speeds and steadily increases in pitch and noise level at higher speeds. Along with the tire change I also had new rotors and pads installed. I thought sure the noise was coming from the uneven wear on the tires. The car vibrates pretty hard at 60mph. Any Ideas?