Single pringle looking to mingle. Has a bit of character, but the throat and mating surface are right and tight.

RESTORATIONS

SPECS

Distribution Pattern   90°H x 40°V

Lowest Recom­mended Crossover Frequency   500 Hz, 511b (1200 Hz when used with 902-8A or 902-16A drivers)

Pressure Sensitivity   Measured on axis in the far (free) field with 1 watt input of band­ limited pink noise from 500-3000 Hz and calcu­lated to 4' equivalent (Ref.: O dB= 0.0002dyne/cm2)

Compatible drivers   902-8A / 902-8T / 902-16A / 908-8A / 731B (limited frequency range)

Dimensions   10.625"H x 23.625"W x 18.5"D

Weight   17.75 lbs.

LINER NOTES

ALTEC 511b and 811b Sectoral Horns are designed for the mid or high-frequency section of two-way or three-way sound systems. The 511b and 811b differ only in cutoff frequency and size. Exponential expansion and a straight throat configuration ensure uniform control of the sound dispersion pattern—90° horizontal by 40° vertical—and exacting reproduction of the middle and high frequencies. Of lightweight aluminum, these horns feature a front-mounting flange for easy installation. Recommended for use with these horns are the ALTEC 902 series, the 908 series, and the 731C High-Frequency Drivers. The 511MB Accessory is available to aid in mounting the larger 511b Horn. The mounting bracket supports the throat and attached driver of the 511b while allowing adjustment in the horizontal plane.