I have the Telefunken CR 20, CR 30 and used to have two CR 100 but I gave those to good friends
The CR 100 is a very nice boombox, especially for its size

It has good clear highs and good bass, looks classic with lots of metal, chrome and double antennas.
The CR 30 is a bit smaller and a lot less cool. The looks are very similar, but less knobs/switches and only one antenna. Line-in: check

But no phono which is unusual, many boxes only have phono but no regular line-in. No separate bass/treble, just tone control

The sound is nowhere near the CR 100 - although it can get rather loud and the bass is decent for the size. It's a neat box and worth spending a few bucks on but it's more of a nice-box-for-10$-at-the-thrift.
The CR 20 is a lot smaller, almost a mini. It has even less controls, only power, function, MW/FM/FM stereo switches and volume, balance, tone knobs. But it has line-in

Pretty much like the CR 30 it's a decent box for its size. It's not exactly loud and definitely no deep bass monster but it sound kind of punchy.
Sorry for the bad pic quality, the light is pretty dim here.