This is the ESU Speaker 13 x 18 x 4.5mm 4ohm with Chamber (1) [50353]

Speaker 13mm x 18mm x 4.5mm, rectangular, 4 ohms, with sound capsule set

This new "sugar cube" speaker, measuring 13mm x 18mm, is larger than the previous ESU speaker.

Since the membrane is a good 40% larger, it can produce significantly higher sound pressure levels. Both bass and mid-range and high-frequency reproduction are flawless.

This speaker can be used anywhere our bass reflex speakers don't have space, but where the best possible bass reproduction is still important.

The same applies to this new ESU speaker: the larger the sound capsule, the better the sound. The set includes four sound capsules of different heights.

With the speaker mounted (hermetically sealed!), the total height is 17.5mm, 12.5mm, 9.5mm, or 7.5mm.