The Rumble 15 is a great amp, line in, headphone out, sounds great. I can't think of a better basic practice amp. For a little more money, you could get a used Rumble 30, or a brand new Rumble 25. My son used a 30 in his high school and college Jazz Band, it was more than loud enough for small auditorium or church gigs, even over horns and a drummer. It has the same line in/headphone out setup so you can play along with MP3's or any other source.
Fender RUMBLE 25 1x8 25W Bass Combo Amp 885978287932 | eBay
Fender RUMBLE 25 1x8 25W Bass Combo Amp 885978287932 | eBay
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