A 'crapophonic' (crap-o-phonic) speaker is sometimes built into budget audio equipment. Sometimes it is used in professional equipment as well in order to provide an alternative to headphones.
The speaker is of poor quality and delivers a barely acceptable output, but is adequate in professional equipment to audition the sound.
Can also be applied to built in microphones in some equipment.
The Marantz recorder has a crapophonic speaker built in. This enables you to audition the sound you have just recorded - however, you would not enjoy full reproduction, or want to endure its output for long.
The crapophonic microphones did the job in an emegency, but good, purpose built plug in microphones would have been better.