Pioneer HPM 150 / 1500 Speaker 1977

Comes with two speakers and two Tweeters.
The Pioneer HPM 150 (HPM 1500 in Europe) is one of the famous vintage speakers out there and the top of the HPM series. The acronym stood initially inconsistently for “high-polymer-mylar / film”, later it was consistently stated as “High Polymer Molecular”, in particular in the US during the 80ies. This heavy 4-way bass-reflex speaker has been sold from 1977 to 1980 for a price of $500. Pioneer´s HPM 150 was not a usual high-end speaker, but it rather a milestone in speaker technology because of two changes. It introduced on the one hand the use of new materials (carbon fiber) for speaker cones and on the other hand the innovative “high polymer molecular film super tweeter”.
Compared to the HPM 100, Pioneer´s standard HPM speaker, the bigger HPM 150 is of significantly higher quality, with a bigger woofer (15 ¾ inch) and the typical omnidirectional super-tweeter, which can be found on top of each speaker.
The tweeter and midrange speaker in the front of the speaker look (nearly) identical to the ones of the HPM 100, but are actually different parts. While the HPM 100 had to cope with distortions at higher volumes, the 150 seems to be immune against distortions at nearly any volume. As this speaker was Pioneer´s high-end household speaker, it is very difficult to find a pair of these on garage sales for little money.