Yes, this is an egg, not a "box" like the classic boomboxes of the 70's and 80's. But, eggs produce more bass per square inch. Why? Because the shape gives designers more freedom to create ported enclosures around the speakers. With a traditional boombox, a lot of the bass gets lost through the back panel, or gets bounced around the circuit boards in random ways, or vibrates the chassis until it makes unwanted noise.
Like most of Panasonic's "Cobra-top" models, the RX-DT75 has two tape decks that sit under a door which also contains the main control panel. It also has a CD player and a digital radio tuner.
There are a total of 6 speakers. The tweeters are located next to the CD slot. The woofers are next. Then the midrange speakers are on the outside corners.
The woofers have an unusual surround, called a "Push-Pull Edge". See the photograph below. Owners have reported needing to replace these surrounds, due to rot. Some people have even used aftermaket speakers,
