A:Answer From what I remember, three options: SRS-HG1, SRS-ZR5, and SRS-ZR7. I opted for the HG1s, simply because they were cheaper than the other two options (I bought used ones), and they could also double as portable speakers. In all honesty, haven't used them as portable speakers once. If you're going for premium sound, there is no doubt the ZR5 & 7s will sound better.