I just got this turntable cheap off of ebay and it doesn't come with a manual. I have an Aiwa receiver with a phono jack in the back of it, but there still is a very soft sound, even with the volume up. I'm guessing I need a pre-amp of some sort? I thought that if your receiver had a phono jack, and not just aux, it is fine. Anyone have a thought on this? My receiver is an Aiwa AV-D58.