Back to the top


The 415-8B is the newest loudspeaker manufactured by Great Plains Audio



The 415-8B is the newest loudspeaker manufactured by Great Plains Audio

This project was inspired by Mr. Jean Hiraga who is well known in the high-end world for his crossover designs, redesigns and modification of loudspeakers and amplifier.
After building successful speaker systems using used Altec 415’s he contacted Great Plains Audio with the idea of make them again.

So here it is the brand new 415-8B.

The Biflex principle solves the problem of obtaining full frequency reproduction from a single-cone loudspeaker. It is no longer necessary to compromise between the small cone of minimum weight diameter best for HF reproduction and the larger, heavier cone, optimum for bass response. The Biflex speaker utilizes the principle of dampened cone compliances. The entire area of the speaker cone propagates the low frequencies, and the smaller central cone the high frequencies

Below 1000 Hz , the stiffness of the mid-cone compliance couples the inner and outer sections into a single moving element. Above 1000 Hz , the balanced mass of the outer section prevents the transmission of sound beyond the mid-compliance. The outer portion of the cone uncouples at this point, permitting the inner section to operate independently.

The Biflex design coupled with the famed Altec standards, produces a loudspeaker with specifications for exceeding those of many two and three-way speaker designs.

Inner cone couples to outer cone and the center cone structure vibrates to reproduce frequencies below 1000 cycles



The 415-8B employs an Alnico V magnet for maximum efficiency; the edge wound copper/clad aluminum edge-wound voice coil is situated in a deep magnetic gap to maintain proper cone linearity, this results in extremely low distortion, even during excessive cone excursion.

Although the 415 does have the extended high frequency response to 14,000 Hz alone, because of its efficiency it will match up well with other GPA components such as the 802-8G driver and our N1200-8C crossover for that extended HF output above 20 kHz.

Customers will find that the new 415-8B will maintain the same high quality and reliability as all the other products Great Plains Audio has been building for years

Each member of our team at Great Plains Audio has over 20 years of experience in building high quality audio products. We employ our combined skills and expertise to make the 415-8B one of the best loudspeakers in the world.